JP2003317600A - Circuit breaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a main contact from being forced to open accidentally due to an inrush current which occurs at a load starting. <P>SOLUTION: When a cord short circuit current, etc., runs through a bimetal 45, because of electromagnetic force between a second iron core 60 and a first iron core 61, the second core 60 moves toward the first core 61 against force of a spring 64 until a side piece 60a comes into contact with an end surface of a concave groove 31h and reaches a target position P2. The electromagnetic force additionally attracts and vibrates the first core 61 toward the second core 60 and rotates a first tripping plate 41. Since the instantaneous inrush current occurs in very short time at a start-up of a motor or an invertor, it stops before the moving second core 60 reaches a target position P2. Then the distance between the first core 61 and the second core 60 is kept above a predetermined value and the main contact is prevented from being forced to open accidentally. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker.

[0002]

2. Description of the Related Art In recent years, as a circuit breaker used in a branch circuit of a house, a branch circuit has been used in place of a breaker for a distribution board for a house (see JIS C 8370) which is generally called a safety breaker. Wiring circuit breaker with instantaneous interruption function for cord short-circuit protection that can instantly interrupt the circuit even with a relatively small short-circuit current, such as when the power cord of the electrical equipment connected to the power supply is short-circuited due to damage or deterioration of the coating (Nippon Electric Industry Association Standard JEM 1477) is used.

The above-mentioned wiring breaker with an instantaneous breaking function for cord short-circuit protection (hereinafter abbreviated as "circuit breaker") is equipped with an electromagnetic release device having a higher sensitivity than that of a conventional safety breaker.
The operating current (the magnitude of the short-circuit current at which the electromagnetic release device trips) is 350 A as the upper limit in the above standard,
It is set to a value whose lower limit is the current value at which the tripping operation is not performed in the overflow test specified in JIS C 8370.

An example of such a circuit breaker is Japanese Patent Laid-Open No. 200
There is one disclosed in Japanese Patent Laid-Open No. 25415/1990. In the conventional example described in this publication, a fixed iron core and a movable iron core are disposed so as to be able to come into contact with and separate from each other so that a current-carrying conductor included in a main circuit is sandwiched between them. The movable core is attracted to the fixed core by the electromagnetic attraction force generated between the fixed core and the movable core when the iron core is biased away from the fixed core and an excessive current such as a short-circuit current flows through the conducting conductor. An electromagnetic release device is provided which releases the opening / closing mechanism to forcibly open the main contact by moving the movable iron core against the spring force of the leaf spring so as to contact the fixed iron core. The operating current of this electromagnetic release device is larger than the peak value of the overflow (solid line B) as shown in FIG. 27A, and the peak of the relatively small short-circuit current (solid line B) that flows when the cord is short-circuited. It is set to a value smaller than the value. The solid line C indicates a large short-circuit current flowing when the circuit is short-circuited.

The operation of the electromagnetic releasing device will be briefly described with reference to FIG. In addition, the horizontal axis in the same figure (b)-(e) shows time, and the vertical axis has each shown the distance between a fixed iron core and a movable iron core. First, when an overcurrent flows in the current-carrying conductor, the movable iron core does not move and the main contact is not opened because the operating current is set to a value larger than the overcurrent as described above (Fig. )reference). On the other hand, when a relatively small short-circuit current due to a cord short circuit (hereinafter referred to as “cord short-circuit current”) flows in the conducting conductor, set the operating current to a value smaller than the cord short-circuit current as described above. Therefore, as shown in (d) of the same figure, when the cord short-circuit current (see solid line B in (a) of the figure) exceeds the operating current, the movable iron core is attracted to the fixed iron core and contacts the fixed iron core. When the cord starts moving, the distance between the movable iron core and the fixed iron core becomes narrower as the cord short-circuit current increases, and when the distance between the two falls below a specified value, the opening / closing mechanism is released to forcibly open the main contact. To do. When a large short-circuit current (hereinafter abbreviated as “short-circuit current”) flows due to a circuit short-circuit, the short-circuit current rises more rapidly than the cord short-circuit current (see solid line C in FIG. 5A). As shown in Figure (e), the distance between the movable core and the fixed core falls below the above specified value in a shorter time than when the cord short-circuit current flows, and the opening / closing mechanism is released to forcibly open the main contact. It will be.

[0006]

However, when a load, such as a motor or an inverter, in which a large inrush current instantaneously flows at the time of startup is connected to the branch circuit, as shown by the solid line D in FIG. 27 (a). If the inrush current at startup exceeds the cord short-circuit current, it will exceed the operating current of the electromagnetic release device, and the movable core will move in the direction of contacting the fixed core, and the movable core and fixed core will increase as the inrush current increases. Although the distance between the two becomes narrower and there is no abnormality such as a cord short circuit, the opening / closing mechanism is released and the main contact is forcibly opened when the distance between the two falls below a specified value. There was a problem.

The present invention has been made in view of the above problems, and an object thereof is to prevent a main circuit contact from being accidentally forcibly opened due to an inrush current that instantaneously flows when a load is started. To provide.

[0008]

In order to achieve the above-mentioned object, the invention of claim 1 includes a body for accommodating a main circuit, and a handle at least a part of which is rotatably exposed from the body.
It has at least an opening / closing mechanism that opens and closes the main contact of the main circuit according to the operation of the handle, and an electromagnetic release device that releases the opening and closing mechanism and forcibly opens the main contact when a short-circuit current flows in the main circuit. The electromagnetic release device includes a first iron core and a second iron core, and a first electric conductor that forms a main circuit is sandwiched therebetween.
The iron core is pivotally moved toward and away from the second iron core, and the first iron core is biased in a direction away from the second iron core so that the second iron core sucks the first iron core and the distance between the first iron core and the second iron core becomes smaller. In a circuit breaker in which an opening / closing mechanism is released when the value falls below a predetermined value, a second iron core is movably arranged in a direction toward and away from the first iron core, and a direction in which the first iron core separates from the second iron core. It is characterized in that the second iron core is urged in a direction away from the first iron core with a force weaker than the force for urging the second iron core into the first position when a current exceeding the rating flows in the current-carrying conductor. Since the first iron core moves in the direction of coming into contact with the second iron core after moving in the direction of coming into contact with the iron core, the first and second iron cores come into contact with each other by the electromagnetic attraction force when a short-circuit current or a cord short-circuit current flows. The main contact is forcibly opened by moving in the direction The inrush current that flows instantaneously at the time of the first
Since the iron core stops flowing before it starts moving, the distance between the first iron core and the second iron core does not fall below a predetermined value, and it is possible to prevent the main contact from being accidentally opened.

According to a second aspect of the invention, in the first aspect of the invention, a compression spring for elastically urging the second core away from the first core is interposed between the second core and the conducting conductor. Characteristically, since it becomes easy to bring the compression spring into contact with the center position of the second iron core, the second iron core can be moved smoothly.

According to a third aspect of the invention, in the second aspect of the invention, the conducting conductor made of bimetal is fixed at one end and the other end is swingable, and an overload occurs when an overload current flows through the conducting conductor. Equipped with a thermal release device that releases the switching mechanism and forcibly opens the main contact by swinging the other end of the current-carrying conductor due to temperature rise due to the current, A compression spring is interposed at a position, and the compression spring and the second spring when the other end of the current-carrying conductor oscillates.
The displacement of the compression spring can be prevented and the fall of the compression spring can be prevented by suppressing the fluctuation of the distance from the iron core.

According to a fourth aspect of the present invention, in the first aspect of the present invention, a compression spring that elastically biases the second core in a direction away from the first core is interposed between the second core and the body. Characteristically, the current-carrying conductor and the first iron core can be arranged after the second iron core and the compression spring are arranged in the body, which facilitates the assembling work.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects of the invention, a latch member for latching the main contact in a closed state and a swingable arrangement in the body are provided to open the main contact. An opening / closing mechanism that restricts the movement of the latch member that shifts to the polar state and that releases the restriction when the distance between the first iron core and the second iron core of the electromagnetic release device is less than a predetermined value In addition, the first iron core is attached to the swinging part of the trip member, and in the electromagnetic release device, the member for transmitting the movement of the first iron core to the trip member is unnecessary, and the number of parts is reduced. In addition, the size can be reduced by shortening the distance between the first iron core and the trip member.

In order to achieve the above-mentioned object, a sixth aspect of the present invention includes a body for accommodating a main circuit, a handle at least a part of which is rotatably exposed from the body, and at least an operation of the handle. It is equipped with an opening / closing mechanism that opens and closes the main contact of the main circuit, and an electromagnetic release device that releases the opening and closing mechanism and forcibly opens the main contact when a short-circuit current flows in the main circuit. Of the latch member for latching the closed state to the closed state and the latch member that is swingably disposed in the body and shifts the main contact to the open state, and urges in the direction of limiting the movement of the latch member. And a tripping member that is swung in a direction in which the regulation is released by the electromagnetic release device when a short-circuit current flows in the main circuit, the electromagnetic release device with respect to the swinging portion of the tripping member. Move in the direction of moving toward and away from the fixed core And a fixed iron core fixed to the body so as to sandwich the current-carrying conductor forming the main circuit between the movable iron core and the movable iron core, and the trip member is attached in a direction to restrict the movement of the latch member. The movable iron core is urged in a direction away from the fixed iron core by a force weaker than the urging force. When the current exceeding the rating flows in the current-carrying conductor, the movable iron core first moves in the direction in which it contacts the fixed iron core with respect to the swinging part of the trip member. Since the movable iron core moves in the direction of contacting the fixed iron core while swinging the trip member, when the short-circuit current or the cord short-circuit current flows, the movable iron core swings the trip member and contacts the fixed iron core. The main contact is forcibly opened by moving However, the inrush current that flows instantaneously when the load starts does not flow before the movable iron core starts to move while swinging the trip member, so the distance between the movable iron core and the fixed iron core does not fall below the specified value. , It is possible to prevent the main contact from being accidentally opened.

According to a seventh aspect of the invention, in the invention of the sixth aspect, a mounting member having a brim portion at the tip of the rod-shaped main portion is provided in the electromagnetic release device, and the movable iron core is penetrated through the front and back sides to have a diameter of the main portion. Is larger than the diameter of the flange, and the main portion of the mounting member is inserted into the through hole, and the rear end of the main portion inserted into the through hole is fixed to the swinging portion of the tripping member. The compression coil spring externally inserted in the main part of the mounting member is arranged between the flange part and the movable iron core, and the compression coil spring is supported by the main part of the mounting member between the flange part and the movable iron core. Therefore, the compression coil spring can be prevented from falling off and buckling.

According to an eighth aspect of the present invention, in the seventh aspect, the plurality of mounting members are provided in the electromagnetic release device, and the movable iron core is provided with a plurality of through holes through which the main parts of the respective mounting members are inserted. It is possible to prevent the displacement of the movable iron core with respect to the swinging portion of the trip member and stabilize the characteristics.

The invention of claim 9 is characterized in that, in the invention of claim 7 or 8, a press-fitting hole for press-fitting the rear end of the main portion of the mounting member is insertably and detachably provided in the swinging portion of the trip member. , The compression spring and the movable iron core can be easily replaced.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION (Embodiment 1) Hereinafter, Embodiment 1 in which the present invention is applied to an earth leakage breaker will be described in detail with reference to FIGS.

In the present embodiment, the body 1 is arranged side by side in the width direction of the body 1 formed by connecting the first side case 1A and the second side case 1B made of synthetic resin on both sides. Two fixed contacts 2A, 2B, two movable contacts 4A, 4B having fixed movable contacts 3A, 3B fixedly facing each of these fixed contacts 2A, 2B, and these two movable contacts 4A,
4B, an opening / closing mechanism 5 for driving, and a movable contact 3A, through the opening / closing mechanism 5 by opening / closing the handle 6.
3B is configured to contact (separate / open) the fixed contacts 2A, 2B, and the fixed contacts 2A, 2B and the movable contacts 4A, 4B are vertically moved in the height direction of the body 1. It is arranged and, in both of the movable contacts 4A, 4B, 2 in the height direction.
One movable contact 4B interposed between the two fixed contacts 2A, 2B and a fixed contact 2A with which the movable contact 3A of the other movable contact 4A comes into contact with and separates from each fixed contact 2A, 2B. It is arranged at a height position where 3B is separated and does not intersect when viewed from the width direction of the body 1.

An intermediate case 7 formed of a synthetic resin material is fixed inside one end of the body 1 in the longitudinal direction so as to be sandwiched between the cases 1A and 1B on both sides.
A terminal block 10A forming an output terminal on the voltage pole side, in which a fixed contact 2A is provided at one end in a partition formed by the recess 8 inside the side wall (outer wall) of the side case 1A and the vertical wall portion 35 of the intermediate case 7, is provided. Neutral with the lower fixed contact 2B provided at one end in the compartment formed by the recess 9 provided on the second case 1B side of the intermediate case 7 and the side wall (outer wall) of the second case 1B. A terminal block 10B forming an output terminal on the pole side or the other voltage pole side is housed.

In the terminal block 10A, a terminal plate 11 bent in a U shape and an extension piece 11a are integrally extended above one end of a lower piece of the terminal plate 11, and the upper end of the extension piece 11a is extended to the extension piece 11a. A fixed contactor 12A that is bent at a right angle to the terminal plate 11 and integrally extends outwardly with respect to the terminal plate 11, a fixed contact 2A that is caulked and fixed to the upper surface of one end of the fixed contactor 12A, and is mounted on the lower piece of the terminal plate 11. Placed on the terminal board 11
It is composed of a substantially U-shaped locking spring 13A housed inside. Then, the lower piece of the terminal plate 11 is placed on the downwardly inclined bottom surface of the concave portion 8 of the first side case 1A, and the extension piece 11a is arranged along the rising wall 8a at one end of the concave portion 8. Fixed contact 12A beyond the upper end
On the fixed contact arrangement portion 15 formed integrally with the rising wall 8a and the partition wall 14 rising from the bottom portion of the first side case 1A by being inclined to the outside of the depression portion 8 and being inclined similarly to the bottom portion of the depression portion 8. By arranging the tip of the fixed contactor 12A, the terminal block 10A is arranged in the recess 8. The fixed contact arrangement portion 15 is formed with a recess 15a that allows the lower end of the fixed contact 2A protruding to the lower surface side of the fixed contact 12A to escape. The terminal board 11 is a T-shaped piece 11 which is upward from the other end of the upper piece.
b is integrally extended, and one end of the side protrusion of the upper end of the T-shaped piece 11b is placed on the upper end surface of the convex flat portion 22 formed on the inner surface of the first side case 1A. . Further, the side surface of the side piece of the terminal board 11 has a pressing piece 13 of a locking spring 13A.
A protrusion 23 is formed integrally with the locking spring 13A for preventing the rattling of the locking spring 13A.

The lock spring 13A and the terminal plate 11 constitute a quick-connect terminal which is a conductor connecting portion. When the intermediate case 7 is superposed on the first side case 1A, the other end portion of the first side case 1A is Diagonal downward groove 1 with a semicircular cross section formed in the vertical wall
A core wire of an electric wire (not shown) inserted from the outside through an oblique downward electric wire insertion hole 16A formed by an oblique downward groove 160 having a similar shape on a wall formed on the opposing wall surface of the intermediate case 7 It is press-fitted between the upper piece of the plate 11, the upper end of the locking piece 13a of the locking spring 13A and the upper end of the pressing piece 13b, and the tip of the locking piece 13a locks the core wire in the pull-out direction of the electric wire, and By pressing the core wire against the upper piece of the terminal plate 11 with the upper end surface of the pressing piece 13b, the core wire is electrically connected and mechanically held. A release handle 17 is used to release the electric wire lock. A rotation shaft 18 provided on the lower side surface of the release handle 17 has a shaft hole 20 provided on a convex flat portion 22 on the inner side surface of the first side case 1A.
A shaft (not shown) that is rotatably supported on the wall surface of the vertical wall portion 35 of the intermediate case 7 is rotatably supported in a recess 37 provided on the other side surface of the lower portion. By manually operating and rotating the operating portion 17a exposed to the outside of the body 1, the drive projection 19 provided at the lower end pushes the tip of one end of the locking piece 13a of the locking spring 13A to lock the locking portion. The piece 13a can be bent to release the lock on the core wire. Reference numeral 21 in the drawing denotes a return spring that constantly biases the release handle 17 in the anti-manual operation direction.

On the other hand, the terminal block 10B is basically the same as the terminal block 10A and has a terminal plate 11 and a locking spring 13B.
And the fixed contactor 12B, the terminal block 10 is different from the terminal plate 11 of the terminal block 10A.
The terminal plate 11 of B is an extension piece 1 extending downward from one end of the lower piece.
1c is formed by extension, and the body 1 is formed from the tip of the extension piece 11c.
The fixed contact 12B is formed to extend in parallel with the bottom of the terminal plate 11 and the back piece 11d is formed to extend at a right angle from one end of the side piece of the terminal plate 11.

The locking spring 13B has the same structure as the locking spring 13A, and is placed on the lower piece of the terminal plate 11,
The protrusion 23 protruding from the side piece of the terminal board 11 is the pressing piece 1.
It is designed to be inserted into 3b.

The terminal block 10B constitutes the bottom of the recess 9 of the intermediate case 7, and the lower piece of the terminal plate 11 is placed on the lateral wall 24 extending substantially parallel to the bottom of the body 1. The inner strip 11d is provided along the vertical wall 25 at one end of the recess 9, and one end of the terminal plate 11 is fitted into a notch 27 formed between the lower end of the vertical wall 25 and one end of the horizontal wall 24 to extend the extension piece. When the intermediate case 7 is superposed on the first side case 1A side, the tip of the fixed contactor 12B, that is, the lower surface provided with the fixed contact 2B, is the first side case. It is designed to be placed on the ribs 26, 26 at the bottom of 1A. That is, the fixed contact 2B is a space formed between the lateral wall portion 24 of the intermediate case 7, the bulge portion 30 described later, and the side walls of the both-side cases 1A and 1B.
It is arranged across A and 1B. The recess between the ribs 26, 26 serves as a relief for the lower end portion of the fixed contact 2B fixed to the tip of the fixed contact 12B by caulking and protruding to the lower surface side of the fixed contact 12B.

The tip of the lateral projection of the upper end of the T-shaped piece 11b extending upward from the other end of the upper piece of the terminal plate 11 has a convex flat portion 22 'formed on the wall surface of the intermediate case 7. Is placed on the top surface of the.

The locking spring 13B and the terminal plate 11 of the terminal block 10B constitute a quick connection terminal which is a conductor connecting portion as in the case of the terminal block 10A, and when the intermediate case 7 is superposed on the second side case 1B. , An oblique downward groove 1 having a semicircular cross section provided on the vertical wall portion at the other end of the recess 9 of the intermediate case 7.
60 and this diagonal downward groove 160 as well as the second side case 1
When an electric wire is inserted through an electric wire insertion hole 16B formed by a diagonal downward groove 160 provided in the vertical wall at the other end of B, the core wire is locked by the locking piece 13a of the locking spring 13B and pressed. The core wire is pressed against the upper piece of the terminal board 11 by the piece 13b to electrically connect the electric wire and mechanically lock it.

A release handle 17 'is used to release the electric wire lock. The release handle 17' has a rotary shaft 18 provided on a lower side surface thereof like the release handle 17 and has a convex flat portion 22 of the intermediate case 7. 'A shaft 38 rotatably supported in a shaft hole 20 provided in the second side case 1B and protruding to the inner wall surface of the second side case 1B is rotatably supported in a recess 37 formed on the side surface. When the operating portion 17a exposed to the outside of the body 1 is manually operated and rotated, the drive projection 19 provided at the lower end pushes the tip of one side end of the locking piece 13a of the locking spring 13B to lock the locking piece. The locked state can be released by bending 13a. Reference numeral 21 'in the figure denotes a return spring for constantly biasing the release handle 17' in the anti-manual operation direction.

The intermediate case 7 has a bulging portion 30 which protrudes toward the second side case 1B side with respect to a vertical wall portion 35 which is substantially parallel to the side walls of the both side cases 1A and 1B and abuts against the inner surface of the side wall of the second side case 1B. The wall formed and hanging from the lower surface of the bulging portion 30 is the vertical wall 25, and is surrounded by the side wall facing the second case 1B side, the bottom wall, the vertical wall 32 at one end, and the ceiling wall 33. A recess is provided on the first side case 1A side. The terminal block 10A assembled to the first side case 1A side when the intermediate case 7 is butted to the first side case 1A side.
The fixed contactor 12A has a tip side portion placed on the stepped surface of the bottom wall of the recess, and the ceiling wall 33 is arranged along the lower surface of the lateral wall 29 protruding from the inner side surface of the first side case 1A. It Further, the vertical wall 32 is formed with an opening 39 for inserting the free end of the movable contactor 4A corresponding to the fixed contact 2A into the recess.

Inside the other end in the longitudinal direction of the one body 1, among the three conductive bars (not shown) respectively arranged at different positions (vertical direction in FIG. 2) in the distribution board. One fixed terminal T for inserting and connecting the conductive bar of the lowest voltage pole
1 is accommodated and arranged, and one selection terminal T2 for selecting and inserting and connecting either the conductive pole of the uppermost neutral pole or the other voltage pole of the middle stage is connected to the neutral pole and the other voltage. An inner housing 200 is provided which is movably arranged between at least two positions corresponding to the pole conductive bars. That is, in the present embodiment, it is possible to selectively correspond to the distribution voltage of 100 V by connecting the selection terminal T2 to the conductive bar of the neutral pole and by connecting the selection terminal T2 to the conductive bar of the other voltage pole. , A so-called 100V / 200V dual-purpose type.

The fixed terminal T1 and the selection terminal T2 are both substantially U-shaped, and are composed of blade receiving springs that are expanded toward the tips after the tips of both side pieces that are vertically parallel to each other come close to each other. The bars are easy to insert, and the conductive bar is sandwiched between the adjacent parts in the center.

The inner housing portion 200 serves as positioning means for positioning the selection terminal T2 at two positions corresponding to the two conductive bars of the neutral electrode and the voltage electrode, respectively. A projection 97 having a substantially semicircular cross section is provided on the wall surface of the end portion of the partition forming the portion 200 in the width direction of the first side case 1A.

On the wall corresponding to the ceiling of the inner housing portion 200 of the body 1, as a display means for displaying whether the selection terminal T2 corresponds to the conductive bar of the neutral pole or the voltage pole. , A through hole 2 that communicates with the inner storage portion 200
01 is provided, and the columnar display portion 2 is formed from the through hole 201 on the slide member 83 accommodating the selection terminal T2.
The position of the selection terminal T2 can be known depending on whether 02 is visible from the outside facing the through-hole 201 or not visible from the outside because it is located away from the through-hole 201. It is also possible to push the slide member 83 from the outside through the through hole 201 and move it downward. The through hole 201 is a circular hole formed by abutting the semicircular cutout holes 201a provided on the upper side walls of the both-side cases 1A and 1B.

The slide member 83 is made of a synthetic resin molded product and is formed in a frame-like shape with both end surfaces corresponding to both end directions of the body 1 open, and the blade receiving spring constituting the selection terminal T2 is opened from one end. The tip end of the blade receiving spring is inserted into the other end opening so as to project therefrom, and the selection terminal T2 together with the slide member 83 is provided inside the inner housing portion 200 as shown in FIG.
Is arranged so as to be movable in the vertical direction.

A vertical direction in which slide protrusions 203 formed on both sides of the slide member 83 are slidably engaged with the inner surfaces of the side walls of the both-side cases 1A and 1B constituting the both side walls of the inner storage portion 200 so as to slide vertically. 2 of the guide groove of
The inner housing portion 200 is formed between the parallel projections 205 of the strip, and the inner housing portion 200 is engaged with the slide projections 203 on both sides of the slide member 83 in the guide grooves 204, 204 on the both side walls, together with the slide member 83 and the selection terminal. T2 is stored and held so as to be slidable in the vertical direction. A slide protrusion may be provided on the inner storage section 200 side and a guide groove may be provided on the slide member 83 side.

The slide member 83 is a leg piece 8 extending downward from the side portion of the first side case 1A as shown in FIG.
3a is integrally extended, and a protruding portion 206 protruding outward is formed at the lower end of the leg piece 83a.

The protruding portion 206 is a slide formed outside the side wall of the first side case 1A constituting the side wall of the inner storage part 200 and upward from the bottom surface of the first side case 1A as shown in FIG. The upper end of the groove 207 is inserted into the slide groove 207 from an insertion hole (not shown) opened so as to communicate with the inner storage portion 200, and is vertically slidable in the slide groove 207 together with the leg pieces 83a. To be done.

The slide groove 207 and the insertion hole are selected terminals T2.
And a bottom portion of the slide groove 207 is formed so as to project into the inner storage portion 200, and is formed at the upper end bottom portion of the slide groove 207. The rear surface of the leg piece 83a, which is inserted upward into the slide groove 207 through the insertion hole, can be brought into sliding contact with the bottom portion of the slide groove 207. Further, at the uppermost portion of the slide groove 207, the protrusion 20 that abuts when the protrusion 206 moves to the upper end of the slide groove 207.
7a is provided.

Thus, the protruding portion 206 has the inner storage portion 200.
If the operation portion for vertically moving the selection terminal T2 in the inside is configured and the protrusion 206 is held from outside the body 1 or is pushed up or down by a driver or the like to slide in the slide groove 207, the slide is performed. Along with the movement, the slide member 83 in the inner storage portion 200 moves up or down together with the selection terminal T2 by being guided by the slide protrusion 203 and the guide groove 204.

When the slide member 83 is moved by the above operation, the upper end or the lower end of the slide member 83 rides over the positioning projection 97 by its elasticity and the rounded surface of the positioning projection 97, and the positioning projection 97 is framed after the movement. The lower part or the upper part of the tip of the portion 83 hits and holds the position of the selection terminal T2.

The opening / closing mechanism 5 for driving the movable contacts 4A and 4B to open and close includes an operating plate 43 which is a latch member, a crossbar 40, and a stepped locking portion 4 which locks one end of the operating plate 43.
1st trip board 41 provided with 1e, and 2nd trip board 42
The handle 6, the U-shaped link 44, and the like. If an abnormally large current flows due to a ground fault or a short circuit in the closed state of one main contact (fixed contact 2A and movable contact 3A), the other main contact (fixed contact is fixed by the first electromagnetic release device 47A). In the closed state of the contacts 2B and the movable contact 3B), if an abnormally large current flows due to a ground fault or a short-circuit accident as well, the second electromagnetic release device 47B may be used to protect the leakage if a leakage current flows to the main circuit. When an overcurrent such as an overload current further flows by the third electromagnetic release device 48, the thermal release devices release the opening / closing mechanisms 5 to forcibly open the main contacts.

The handle 6 is composed of an operating portion 6a, a rotating portion 6b, and a handle shaft 6c. The handle shaft 6c protruding in the center of both side surfaces of the rotating portion 6b is formed on the inner surface of the first side case 1A. Rotatably inserted into the shaft hole 49 and the shaft hole 49 formed on the inner surface of the second side case 1B and held between the both side cases 1A and 1B. , 1B connected to each other
The window 50 is opened on the upper surface of the. A torsion spring 36 is attached to the handle shaft 6c, and the torsion spring 36 biases the handle 6 in the opening operation direction at the closing operation position (see FIGS. 2 and 3).

The upper shaft 44a of the U-shaped link 44 is rotatably inserted into the shaft hole 6d provided at the lower end of the rotating portion 6b.
It is connected to the operating plate 43 via a U-shaped link 44.

The operating plate 43 has bearing holes 4 provided on both sides in the center.
By inserting the lower shaft 44b of the U-shaped link 44 into 3a, the lower shaft 44b is connected to the handle 6 through the U-shaped link 44, and is vertically movable in the body 1.

The crossbar 40 is pivotally supported between both side cases 1A and 1B by inserting shafts 40a protruding from both side surfaces of the upper part into shaft holes 52 and 52 formed in the inner side surfaces of the both side cases 1A and 1B. Then, as shown in FIG. 2, a groove 54 for laterally fitting the side portion of the movable contactor 4A is formed on the side portion on the first side case 1A side slightly below the shaft 40a, and as shown in FIG. The movable contact 4B is provided on the side of the second case 1B of the
There are provided cut grooves 55 for laterally fitting. The movable contact 3A, 3B has a stopper 130 protruding from the inner surface of the side wall of the intermediate case 7 and the first side case 1A at the end surface of the movable contact 3A, separated from the fixed contacts 2A, 2B. A recessed groove 131 is formed in the width direction to be engaged with and to come into contact with the bottom portion thereof (see FIG. 3).

The movable contactor 4A is made of a rigid conductive metal plate, is inserted into the cut groove 54 of the crossbar 40 from the side, and is provided with a recess 40 provided behind the cut groove 54.
b (see FIG. 3), the rear portion is biased upward by a coil spring 53 for contact pressure that is compressed between the lower surface of the rear portion and the bottom portion of the recess 40b. When the movable contactor 4A rotates about 40a, the movable contactor 4A rotates about the opening edge of the cut groove 54, and the movable contact 3A fixed by caulking to the free end corresponds to the fixed contact 2A.
It is designed to be opened and contacted with.

The movable contactor 4B is made of a conductive spring thin plate material, and is pushed downward when the crossbar 40 is rotated in the closing operation direction to be bent. From this bent state, the crossbar 40 is opened in the opening operation direction. When it rotates, it returns and the movable contact 3B that is caulked and fixed to the tip by its bending and returning.
Is to be brought into contact with or separated from the fixed contact 2B.

The lower end of the crossbar 40 is
Rotational force is applied by being pushed by the coil spring 62 that is compressed between the wall 63 and the wall 63 that stands upright from the bottom of the first side case 1A.

As shown in FIG. 5, the first tripping plate 41 includes a shaft portion 41a and a protruding portion 4 protruding above the shaft portion 41a.
1b and a pair of leg portions 41 protruding below the shaft portion 41a
c and 41d, both ends of the shaft portion 41a are inserted into shaft holes 56, 56 provided on the inner side surfaces of the both-side cases 1A, 1B to be rotatably supported between the both-side cases 1A, 1B. The torsion spring 81 elastically biases the protrusion 41 b in a direction (clockwise in FIG. 2) away from the bimetal 45. A locking portion 41e is formed at the upper end of the protruding portion 41b to engage and disengage one end of the operating plate 43.
A receiving portion 41g that is driven and driven by a bimetal 45, which will be described later, is projectingly provided on the tip side surface of c, and the other leg portion 41 is provided.
A receiving portion 41f, which is driven by the second trip plate 42, is projectingly provided on the side surface of the tip of d.

The second tripping plate 42 is formed in a substantially V shape in which the facing portion 42a and the receiving portion 42c project from the central portion having the shaft hole 42b, and the shaft 31f provided in the partition wall member 31 to be described later is fitted into the shaft hole 42b. It is inserted into and pivotally supported. A drive piece 42d is provided on the end surface of the facing portion 42a so as to face the lower end of a bimetal 46, which will be described later, and is pushed when the bimetal 46 is bent.

Conductive plates 71A, 71B made of thick metal material
As shown in FIGS. 1 and 5, the adjustment screw 7 is provided on one end side.
A screw hole 71a into which 7 and 77 'are screwed is provided through, and a pair of caulking shafts 71b are provided on the lower surface side of the other end so as to project. Then, the adjusting plates 72 and 72 'made of a thin metal material obtained by welding and fixing the bimetals 45 and 46 constituting the thermal release device to one end side respectively, and the pair of holes 72a penetrating to the other end side are provided. The caulking shaft 71b is inserted and caulked to attach the caulking shaft 71b to the lower surfaces of the conductive plates 71A and 71B.

A braided wire 79, one end of which is welded to the fixed terminal T1, is provided at a fixed portion of one bimetal 45 with the adjusting plate 72.
The other end of A is welded, and a lead wire 82A whose one end is connected to a first circuit board 73 described later is welded,
One end of the braided wire 79D whose one end is welded to the movable contact 4A is welded to the substantially central portion of the bimetal 45, and the fixed terminal T
1, the braided wire 79A, the conductive plate 71A, the bimetal 45, the braided wire 79D, and the movable contactor 4A are electrically connected. Further, the other part of the bimetal 46 fixed to the adjusting plate 72 'has a braided wire 79 whose one end is welded to the selection terminal T2.
The other end of B is welded, and the other end of the braided wire 79C, whose one end is welded to a current-carrying conductor 80 (described later) connected to the movable contactor 4B, is welded to the substantially central portion of the bimetal 46, and the selection terminal T2, the braided wire 79B, the conductive plate 71B, the bimetal 46, the braided wire 79C, the conducting conductor 80, and the movable contact 4B are electrically connected. The adjustment screw 77,
The distance between the adjusting plates 72, 72 'and the conductive plates 71A, 71B is changed by screwing 77', and the bimetal 45,
The lower end position of 46, that is, the sensitivity of the thermal release device can be adjusted.

The conductive plates 71A and 71B and the bimetals 45 and 46 are held by the partition wall member 31. The partition wall member 31 is made of a synthetic resin molded product having an insulating property, and has a flat plate-shaped partition wall 31a for separating the two bimetals 45 and 46, and both sides in the thickness direction (width direction of the body 1) from the peripheral edge of the partition wall 31a. Each of the recesses 31c, 31 having a protruding peripheral wall 31b and surrounded by the partition wall 31a and the peripheral wall 31b.
c is a conductive plate 71A, a bimetal 45, and a conductive plate 71B.
And bimetal 46 are stored respectively. Recess 31c,
A plurality of protrusions 31d are provided so as to be opposed to each other on a peripheral wall 31b above 31c, and the conductive plate 71 is provided between these protrusions 31d.
The conductive plates 71A and 71B and the bimetals 45 and 46 are held by the partition wall member 31 by press-fitting A and 71B (see FIGS. 2 and 3). In addition, the conductive plates 71A and 71B
In the upper peripheral wall 31b of the recesses 31c, 31c accommodating
Rectangular notches 31e, 31e are formed to expose the adjusting screws 77, 77 'to the outside of the recesses 31c, 31c. Further, the shaft hole 42 of the second trip plate 42 is provided at the bottom of the recess 31c on the side where the conductive plate 71B and the bimetal 46 are housed.
A shaft 31f to be inserted into b is provided in a protruding manner.

In the first electromagnetic release device 47A, as shown in FIG. 5, a pair of side pieces 60a, 60 having different lengths of magnetic iron plates are used.
A second iron core 60 that is formed by bending into a substantially U shape in plan view having b
And a first iron core 61 formed of a rectangular flat magnetic iron plate. The second iron core 60 is placed on a step portion 31g formed on the peripheral wall 31b on the side of the recess 31c accommodating the conductive plate 71A, and one (shorter) side piece is placed in the concave groove 31h provided in the partition wall 31a. The 60a is housed in the recess 31c in such a manner that it is movably fitted in the front-rear direction (left-right direction in FIG. 2) and is arranged between the bimetal 45 and the peripheral wall 31b (see FIG. 2). On the other hand, the first iron core 61 is formed with a pair of through holes 61a penetrating in the thickness direction, and a pair of protrusions is provided on the surface of the upper end portion of the protruding portion 41b of the first trip plate 41 on the opposite side to the locking portion 41e. The projection 41h of the through hole 61a
It is attached to the first trip plate 41 by inserting it into the first tripping plate 41, and as shown in FIG.
Faces the magnetic pole surface that is the tip of the side piece 60b. here,
A cylindrical spring seat 60c is projectingly provided at a portion of the side pieces 60a, 60b of the second iron core 60 facing the bimetal 45, and one end fixed from the center of the bimetal 45 facing the spring seat 60c in the longitudinal direction (see FIG. 5). Similarly, a columnar spring seat 45a is also provided at a position closer to the (upper end) side, and both ends of a return spring 64 composed of a compression coil spring are externally inserted to these two spring seats 60c and 45a. A return spring 64 is provided between the second iron core 60 and the bimetal 45.
Is installed. That is, the second iron core 60 is movable in the direction in which the one side piece 60a is fitted into the concave groove 31h (the left-right direction in FIG. 2) to move toward and away from the first iron core 61, and by the return spring 64. It is elastically biased in a direction away from the first iron core 61. By setting the spring force of the return spring 64 to be weaker than the spring force of the torsion spring 81 that elastically biases the first trip plate 41, the first iron core 61
The second iron core 60 is biased in a direction away from the first iron core 61 by a force weaker than the force (spring force of the torsion spring 81) biasing the second iron core 60 away from the second iron core 60. In addition, in this way, the second iron core 60 is provided between the second iron core 60 and the bimetal 45.
Spring 6 for elastically urging the spring away from the first iron core 61
By interposing 4, the return spring 64 can be easily brought into contact with the center position of the second iron core 60, so that the second iron core 60 can be moved smoothly. In addition, the spring seat 4 is provided at a position near the one end fixed from the center of the bimetal 45.
Since 5a is provided and the return spring 64 is attached, the displacement of the return spring 64 and the dropout of the bimetal 45 when the other end of the bimetal 45 swings are suppressed by suppressing the fluctuation of the distance between the return spring 64 and the second iron core 60. There is an advantage that can be prevented.

Thus, the bimetal 4 which is the current-carrying conductor of one pole including the main contact (fixed contact 2A and movable contact 3A)
When an abnormally large current flows due to a cord short circuit or a circuit short circuit, the magnetic pole surface of the side piece 60b of the second iron core 60 and the first iron core 6
First, the second iron core 6 is generated by the electromagnetic attraction force generated between
0 moves toward the first iron core 61 against the spring force of the return spring 64, and the second iron core 60 moves to a position where the side piece 60a comes into contact with the end surface of the concave groove 31h. The first iron core 61 is sucked and swung in a direction approaching the second iron core 60, and the first trip plate 41 to which the first iron core 61 is attached is rotated counterclockwise in FIG. In this way, the first iron core 61 is connected to the first trip plate 41 in this way.
A member that transmits the movement of the first iron core 61 to the first trip plate 41 by being attached to the first trip core 41 (for example, the second electromagnetic release device 4).
The second tripping plate 42 in 7B) is not necessary, the number of parts can be reduced, and the distance between the first iron core 61 and the first tripping plate 41 can be shortened to achieve miniaturization.

The second electromagnetic release device 47B is, as shown in FIG. 6, a fixed iron core 57 formed by bending a magnetic iron plate into a substantially U-shape in plan view, and a movable iron core 58 formed of a rectangular flat magnetic iron plate.
And a leaf spring 59 which is an elastic member for supporting the movable iron core 58 on the magnetic pole surfaces of both ends of the fixed iron core 57 in a swingable manner and for elastically biasing the movable iron core 58 in a direction away from the fixed iron core 57. Further, the conducting conductor 80 has a braided wire 79 at the tip.
One end of C is welded to the inner piece 80a, and an outer piece 80b that extends from the rear end of the inner piece 80a in a substantially L-shape and faces the inner piece 80a substantially in parallel is formed. The rear end of the movable contactor 4B is connected to.

In the movable iron core 58, the protrusions 58a, 58a which are projected on the surface on the fixed iron core 57 side are provided on the central piece 59 of the leaf spring 59.
The plate spring 59 is swingably supported by being inserted into holes 59b, 59b formed at one end of a and fixed by caulking.
On the other hand, the leaf spring 59 includes both side pieces 59c, 59c formed by bending both sides of the central piece 59a.
7a and 57a are arranged along the outer surfaces of both side pieces 5
Locking piece 59 protruding inward at the tip of 9c, 59c
By locking d and 59d in the recesses 57b and 57b formed at the outer corners of the fixed iron core 57, the inner piece 80a of the current-carrying conductor 80 is placed between the fixed iron core 57 and the movable iron core 58 as shown in FIG. The movable iron core 58 is interposed between the inner piece 80a and the outer piece 80b, and is fixed to the fixed iron core 57. At this time, the magnetic pole surfaces, which are the tips of the both side pieces 57a, 57a of the fixed iron core 57, have the central piece 59a of the leaf spring 59 and the both side pieces 59a.
The movable core 58 is opposed to the movable iron core 58 via the gaps c and 59c.

Thus, when an abnormally large current such as a short circuit current due to a circuit short circuit flows through the current-carrying conductor 80 electrically connected to the movable contact 3B constituting the main contact of the other pole, the fixed iron core 57. The movable iron core 58 is attracted and swung by the electromagnetic attraction force generated on the magnetic pole surfaces of the both side pieces 57a, 57a. Since the fixed iron core 57 and the movable iron core 58 are connected by the leaf spring 59 to form a block as described above, it is easy to assemble the second electromagnetic release device 47B into the body 1 as described later. Is.

Here, the direction of the electromagnetic attraction force generated on the magnetic pole surfaces of both side pieces 57a, 57a of the fixed iron core 57 due to the current flowing through the inner piece 80a of the current-carrying conductor 80 and the both sides of the fixed iron core 57 due to the current flowing through the outer piece 80b. The direction of the electromagnetic attraction force generated on the magnetic pole surfaces of the pieces 57a, 57a is made the same, and the electromagnetic attraction force for attracting the movable iron core 58 is strengthened to quickly open the main contact.

On the other hand, in the third electromagnetic release device 48, the exciting coil 6 is applied to the fixed iron core 57 of the second electromagnetic release device 47B.
It is configured by winding 8. That is, as shown in FIG. 6, a coil bobbin 69, which is made of an insulating material such as synthetic resin and is formed into a rectangular tube shape with one side open, is formed so that the side pieces 57a, 57a of the fixed iron core 57 are projected from both ends in the axial direction. Then, as shown in FIG. 7, the outer collars 69a, 69 are provided on both ends of the coil bobbin 69 in the axial direction.
A coil 68 is wound between a. It should be noted that the substantially bobbin-shaped support portions 69b and 6 each having an insertion hole 69c penetrating the open sides of the outer collars 69a and 69a of the coil bobbin 69 are provided.
9b is provided in a protruding manner, and one end portions of the substantially L-shaped terminal pins 69d are inserted into the insertion holes 69c, respectively.
Terminals 68a of the coil 68 are twisted and electrically connected to one ends of the terminal pins 69d protruding from the ends.

Thus, when a leakage current flows due to a ground fault, the leakage current protection circuit 51, which will be described later, causes the terminal pin 69.
The coil 68 is energized via d to excite the fixed iron core 57, and an electromagnetic attraction force is generated on the magnetic pole surfaces of both side pieces 57a, 57a of the fixed iron core 57 to attract and swing the movable iron core 58. That is, by winding the coil 68 around the fixed iron core 57, the fixed iron core 5 that constitutes the second electromagnetic release device 47B.
7. The movable iron core 58 and the leaf spring 59 can also be used as the third electromagnetic release device 48 for earth leakage protection. The number of parts can be reduced, and the space can be saved and the size can be reduced, as compared with the case where each is composed of independent parts.

The coil 68 between the fixed iron core 57 and the movable iron core 58 and the current-carrying conductor 80 (inner piece 80a).
Since the energizing directions of No. 1 and No. 3 coincide with each other, it is possible to enhance the electromagnetic attraction force generated on the magnetic pole surfaces of both side pieces 57a, 57a of the fixed iron core 57 when the coil 68 is energized and the third electromagnetic release device 48 operates. The main contact can be opened quickly. Further, since the coil 68 is wound around the fixed iron core 57, the coil 68 does not move, so that the disconnection of the coil 68 can be prevented. However, the movable iron core 58 has a coil 6
8 may be wound.

The leakage protection circuit 51 has a circuit configuration shown in FIG.
9A) and the electric line of the neutral pole or the other voltage pole (braided wire 79
B) is equipped with a zero-phase current transformer ZCT inserted, and if the current flowing through each pole of the main circuit becomes unbalanced due to a leakage current such as a ground fault current, it will be unbalanced between the output terminals of the zero-phase current transformer ZCT. A current (detection current) corresponding to the degree flows. This detection current is an alternating current, and the diodes D1 and D connected in antiparallel are
The detected current is converted into a voltage by being clamped by the clamp circuit composed of 2 and charging the smoothing capacitor C1 via the resistor R1. Then, the voltage across the smoothing capacitor C1, that is, the detection voltage converted from the detection current is input to the leakage current determination circuit 51a.

The power source of the leakage current determination circuit 51a is a terminal pin 69d, a coil 68 of the third electromagnetic release device 48, a diode D3, resistors R2 to R5, and a smoothing capacitor C2. The voltage across the smoothing capacitor C2 is connected to the leakage current determination circuit 51a.
It can be obtained by applying to the power supply terminal and the ground terminal of. A series circuit of a coil 68, a thyristor SCR and a diode D3 is connected between the two poles of the main circuit, and a control signal output from the output terminal of the leakage current determination circuit 51a is applied to the gate of the thyristor SCR. Then turn on the thyristor SCR. A filter circuit including a capacitor C0 and a resistor R0 is connected between both ends of the thyristor SCR.

The leakage current determination circuit 51a compares the detected voltage with a predetermined threshold value, and according to the comparison result, the capacitor C
3 is charged or discharged, and the comparison result is delayed by outputting a control signal from the output terminal according to the voltage across the capacitor C3. Therefore, when a leakage current flows in the main circuit, the control signal causes a thyristor SC.
When R is turned on and the coil 68 is energized, the third electromagnetic release device 48 operates and the movable iron core 58 is attracted to the fixed iron core 57. The leakage current determination circuit 51a is formed of an integrated circuit, and is externally provided with the capacitor C3 and a resistor R6 that determines a time constant for discharging the capacitor C3 after detecting the leakage.

A resistor R is provided between the two poles of the main circuit.
T, normally open test switch SW and zero-phase current transformer ZCT
A test circuit 70 formed of a series circuit of leads 70a inserted in the is connected. That is, by turning on the test switch SW and flowing a current through the lead 70a, an unbalanced current is caused to flow through the primary side of the zero-phase current transformer ZCT to create a pseudo leakage current state, and the leakage protection circuit 51 operates normally. It can be tested whether or not to do. A surge absorbing element SA is connected in parallel with the resistor RT and the test switch SW.

By the way, the plurality of kinds of circuit components constituting the leakage protection circuit 51 and the test circuit 70 are mounted on the first and second circuit boards 73 and 74 which are printed wiring boards as shown in FIG. . On the first circuit board 73, high-voltage circuit components (resistors R2, R3, and R3, which form a high-voltage circuit on the left side of the boundary line W shown by the dotted line in the circuit diagram of FIG. 8).
A diode D3, a test circuit 70, a filter circuit, etc. are mounted, and on the second circuit board 74, a weak electric circuit component (leakage current determination circuit 51a, a clamp circuit) that constitutes a weak electric circuit on the right side of the boundary line W is formed. , Smoothing capacitor C1, zero-phase current transformer ZCT, etc.) and thyristor SCR are mounted. One end of the test switch SW is the first circuit board 73.
Movable contact plate 76a joined to and supported swingably
And a pin-shaped fixed contact 76b mounted on the first circuit board 73 so as to face the movable contact plate 76a, and is movably disposed above the free end of the movable contact plate 76a. When the test button 78 is being pressed, the movable contact plate 76a driven by the test button 78 is fixed to the fixed contact 76.
It is turned on by contacting b.

The zero-phase current transformer ZCT is a ring-shaped core (not shown) in which a winding (not shown) is wound as shown in FIG.
Is housed in a synthetic resin molded housing 75, and a pair of output terminals 75a projecting from the side surface end portions of the housing 75 opposed to the axial direction of the core are provided on the upper part of the second circuit board 74. The output terminal 75a is mounted by being soldered to a wiring pattern (not shown) on the back surface while being inserted into the notches 74a, 74a and the housing 75 being in close contact with the surface of the second circuit board 74.

The housing 75 of the zero-phase current transformer ZCT
Includes the first and second circuit boards 73,
The contact pins that are the multiple mounting parts for mounting the 74
67₁~ 67_FiveAre projected from both side surfaces in the axial direction.
These contact pins 67 ₁~ 67_FiveIs made of metal
Align its axial direction with the axial direction of the zero-phase current transformer ZCT, and
How to make both ends protrude from the side surface of the housing 75
The first circuit board 73 is insert-molded on the ging 75.
Contact pin 67 on the side facing the₁~ 67_FiveSo
The boss 75c that covers the front end of the
It is formed integrally.

On the other hand, the first and second circuit boards 73, 74
The through hole 73a for inserting the respective contact pins 67 ₁ to 67 _5, 74b are perforated respectively, the contact pins 67 inserted through the through hole 73a, to 74b
By joining the ends of _{1-67 5} to the wiring pattern,
The first and second circuit boards 73 and 74 are zero-phase current transformer ZCT
It is attached to both sides in the thickness direction (axial direction). At this time, the contact pins 67 _{1-67 4} also serves as a current path between the two circuit boards 73 and 74, the contact pins 67 _1-67 first and second circuit board through ₅ 73,7
The circuit components mounted in 4 are electrically connected. Also,
A third electromagnetic release device 48 is provided below the first circuit board 73.
Through-holes 73b through which the terminal pins 69d, respectively, are inserted, and each through-hole 73b is formed.
The coil 68 is electrically connected to the leakage protection circuit 51 by joining the end portion of the terminal pin 69d inserted through to the wiring pattern. Yes further contact pins 67 ₅ provided in the vicinity of the through-hole 75b which opens in the center of the housing 75,
The contact pins 67 ₅ is the lead 70a of the test circuit 70 to interpolate transmural core of the zero-phase current transformer ZCT. The first and second circuit boards 73 and 74 are provided with circular insertion holes 73c and 74c which communicate with the through hole 75b of the housing 75 and into which the braided wires 79A and 79B are inserted. Also,
On the first circuit board 73, one end of the lead wire 82A connected to one pole of the main circuit (the pole having the main contact of the fixed contact 2A and the movable contact 3A) through the conductive plate 71A, and the other end of the main circuit. The other end of the lead wire 82B, one end of which is welded, is connected to the connecting member 99 for connecting to the pole (the pole having the main contact of the fixed contact 2B and the movable contact 3B).

Thus, a plurality of types of circuit components constituting the leakage protection circuit 51 are mounted on the first and second circuit boards 73 and 74, and the first and the first circuits are provided on both sides in the thickness direction of the zero-phase current transformer ZCT. Two
Since the circuit boards 73 and 74 of 1 are arranged and housed in the body 1, each circuit board is compared with the case where the leakage protection circuit 51 and the zero-phase current transformer ZCT are mounted on one circuit board as in the conventional case. The dimensions of 73 and 74 in the longitudinal direction can be reduced, and the body 1 can be downsized. The contact pins 67 serving as mounting portions to the housing 75 of the zero-phase current transformer ZCT ₁ to 67 ₅
By providing the first and second circuit boards 73, 7
The zero-phase current transformer ZCT can be easily attached to the No. 4. Further, the mounting portion is made of metal contact pins 67 ₁ ...
67 ₄ and then, since the current path for electrically connecting the first and second circuit board 73 and 74, passing between the circuit board 73 and 74 as compared to the case of wire separately using a lead wire or the like electrical path has the advantage of easy formation, moreover the contact pins 67 _{1-67 5} can be insulated from the windings of the zero-phase current transformer ZCT by insert molding the housing 75.

Further, the contact pin 67 _{5 is connected} to the test circuit 7
Since the lead 70a of 0 is used, the first and second circuit boards 73 and 74 are attached to the zero-phase current transformer ZCT to easily insert the lead 70a of the test circuit 70 into the core of the zero-phase current transformer ZCT. Can be made. Further, the first circuit board 73 is mounted with high-voltage circuit components that form a high-voltage circuit, and the second circuit board 74 is mainly mounted with low-voltage circuit components that are a low-voltage circuit. Therefore, it is possible to mount more circuit components on the second circuit board 74 which mainly mounts the weak electrical circuit components that can reduce the insulation distance as compared with the strong electrical system. Here, since the lead wire 82A for connecting to one pole of the main circuit and the lead wire 82B for connecting to the other pole of the main circuit are connected to the first circuit board 73 on which the high-voltage circuit component is mounted. , The second circuit board 74
In the above, there is an advantage that the circuit components can be arranged without considering the insulation distance from the connection position of the lead wires 82A and 82B.

In assembling the earth leakage circuit breaker of this embodiment, first, the terminal block 10A is housed in the recess 8 of the first side case 1A and the release handle 17 is provided.
Is assembled in a fixed position together with the return spring 21. Further, the handle 6 is incorporated in a predetermined position together with the torsion spring 36. Then, the crossbar 40 is fitted with the movable contactor 4A in the cut groove 54, accommodates the coil spring 53 in the recess, and is rotatably arranged together with the coil spring 62 at a predetermined position of the first side case 1A. Further, the operating plate 43 is arranged so as to be connected to the handle 6 by a link 44.

Furthermore, the fixed terminal T1 is housed in the housing portion 90 provided at the bottom portion of the other end of the body 1, and the selection terminal T2 together with the slide member 83 is abutted against the second side case 1B. It is stored in a compartment inside the first side case 1A corresponding to the inner storage section 200. Further, the leg piece 83a of the slide member 83 is inserted into the slide groove 207 formed on the outer surface of the side wall of the first side case 1A through the insertion hole to expose the protrusion 206 to the outside.

Further, the separation wall 91 formed in the height direction of the first side case 1A along the inner storage portion 200, and the first
In the upper portion of the space between the separation wall 65 formed in the height direction so as to face the separation wall 91 at approximately the center in the longitudinal direction of the side case 1A,
While accommodating the first and second circuit boards 73 and 74 mounted on the zero-phase current transformer ZCT with the second circuit board 74 having a long longitudinal dimension as the partition wall 91 side, the first and second circuit boards 73 and 74 are accommodated in the lower space. The electromagnetic release devices 47B and 48 of No. 3 are housed.
Here, two ribs 92 are provided along the width direction of the body 1 in the vicinity of the partition wall 91 on the bottom of the first side case 1A, and a fitting groove formed between the two ribs 92. By fitting the lower end portion of the second circuit board 74 to 92a, the longitudinal direction thereof substantially coincides with the height direction of the first side case 1A, and the axial direction of the zero-phase current transformer ZCT is the first side case. The second circuit board 74 is positioned and fixed so as to substantially coincide with the longitudinal direction of 1A.

Further, rectangular window holes 98 are opened in the side walls of the both-side cases 1A and 1B facing the zero-phase current transformer ZCT, and the portion having the largest width of the housing 75 is opened in the window hole 9.
8 and is used as an escape for the housing 75. That is, the width dimension of the housing 75 of the zero-phase current transformer ZCT is the first.
Also, since the width dimension of the second circuit board 73, 74 is slightly larger than the width dimension of the housing 1 to match the width dimension of the housing 75, a wasteful space is generated. By providing the housing 75 and allowing the housing 75 to escape, useless space is prevented from occurring and the width dimension of the body 1 can be reduced. However, the width dimensions of the housing 75 and the body 1 are set so that the housing 75 inserted into the window hole 98 does not project beyond the side wall outer surfaces of the both-side cases 1A and 1B.

On the other hand, the second and third electromagnetic release devices 47
B and 48 are movable iron cores 58 as shown in FIG.
Is arranged at the bottom of the first side case 1A in the lower part of the space in the height direction, and the zero-phase current transformer ZCT is arranged above the fixed iron core 57 in the height direction of the body 1.
The fixed iron core 57 and the movable iron core 58 thus connected by the leaf spring 59 are arranged at the bottom of the container 1 along the height direction of the container 1, and the axial direction is provided above the fixed iron core 57 and the movable iron core 58. If the zero-phase current transformer ZCT is arranged so as to be substantially aligned with the longitudinal direction of the body 1, the fixed iron core 57 and the movable iron core 58 can be arranged.
Since it is possible to dispose the energizing conductor 80 sandwiched in the inside of the body 1 with its extending direction aligned with the longitudinal direction of the body 1, it is possible to reduce the size of the body 1 in the height direction. it can.
Further, by disposing the zero-phase current transformer ZCT above the fixed iron core 57 and the movable iron core 58 in the height direction, it is possible to reduce the size of the body 1 in the longitudinal direction. Furthermore, the zero-phase current transformer Z
Since the axial direction of CT is aligned with the longitudinal direction of the body 1, the work of passing the electric circuit (braided wires 79A, 79B) of the main circuit through the zero-phase current transformer ZCT can be easily performed. Alternatively,
When the braided wires 79A and 79B are installed in the first side case 1A in a state where the braided wires 79A and 79B are passed through the zero-phase current transformer ZCT in advance, the distance over which the braided wires 79A and 79B are routed within the body 1 can be short. Moreover, since the movable iron core 58 is arranged on the bottom side of the body 1, the zero-phase current transformer ZCT is used for the suction operation of the movable iron core 58.
Is not affected, and the contact opening characteristics of the main contact described later can be stabilized.

Here, in the movable contactor 4B, the rear end of which is connected to the front end of the outer piece 80b, the obliquely upwardly inclined portion of the central portion thereof is located slightly above the bottom of the first side case 1A. Arranged between the bottom of the first side case 1A and the partition wall 95 that extends from the lower end of the separation wall 65 in the direction of the other end of the first side case 1A and is parallel to the bottom of the first side case 1A. Then, the free end side of the movable contactor 4B is attached to the partition wall 14
It is arranged in the space where the fixed contact 12B is arranged via the notch 14a. At this time, the rear end portion of the movable contactor 4B is sandwiched and fixed by a plurality of ribs 96 protruding from the bottom surface of the parallel portion of the partition wall 95 and the bottom portion of the first side case 1A. Further, at this time, the connection member 99 connected to the first circuit board 73 and the lead wire 82B is sandwiched and fixed between the bottom portion of the first side case 1A and the movable contactor 4B to fix the leakage protection circuit 51 and the test circuit 70. Is connected to the electric circuit of one pole.

Further, in the space between the partition wall 65 and the partition wall 95, the conductive plates 71A and 71B and the bimetals 45 and 46 are formed.
The partition wall member 31 holding the is stored. At this time, the partition member 31 is positioned in the space of the body 1 by placing the inclined portion of the lower peripheral wall 31b of the partition member 31 that is inclined obliquely upward along the inclined portion of the partition wall 95. Thus, in the longitudinal direction of the body 1, the bimetal 4
Since the first circuit board 73 is arranged on the side close to 5, 46, the second circuit board 74 and the bimetal 45,
I mounted on the second circuit board 74 at a distance from 46
It is possible to suppress the influence of the heat generated by the bimetals 45 and 46 on the weak electric circuit components such as C (leakage current determination circuit 51a) that are weak against heat.

Furthermore, after the second iron core 60 is arranged in the recess 31c together with the return spring 64, the first trip plate 41 is rotatably arranged in a fixed position together with the torsion spring 81, and the second trip plate 42 is arranged. Is rotatably arranged at a fixed position. At this time, the receiving portion 42c of the second trip plate 42 faces the tip of the movable iron core 58.

Thus, as shown in FIG. 11, except for the intermediate case 7, the terminal block 10B housed in the recess 9 of the intermediate case 7, the release handle 17 'and the return spring 21' thereof, the first case 1A side. After arranging and assembling, the intermediate case 7 having the terminal block 10B, the release handle 17 'and the return spring 21' assembled in the recess 9 is arranged so as to overlap the first side case 1A side.

When the intermediate case 7 is disposed at a fixed position on the first side case 1A side, the free end side of the movable contactor 4A is disposed in the recess through the opening of the vertical wall and the terminal block 10A. The tip end side portion of the fixed contactor 12A provided on the above is placed on the step surface of the bottom wall, and the shaft is fitted into the recess 37 of the release handle 17.

On the other hand, the fixed contacts 12B provided on the terminal block 10B are placed on the ribs 26 on the bottom of the first side case 1A. Further, the lower surface of the downward step formed on the end of the intermediate case 7 is placed on the flat surface formed on the end wall of the first side case 1A.

In this state, the second side case 1B is superposed on the first side case 1A side to be joined. At this time, the claw-shaped hooking locking portions 101 at the tips of the elastic locking pieces 100 at the four positions above and below both ends that are integrally projected from the first side case 1A to the second side case 1B side correspond to the second side case 1B side. And the first side case 1
A and the second side case 1B are coupled and fixed to form the body 1 (see FIG. 11 and the like). This first side case 1
When removing the connection fixing of A and the second side case 1B,
A driver is inserted into the side case 1B through the release holes 150 that are opened corresponding to the hooked portions 102, and the hooked locking portions 101 of the corresponding elastic locking pieces 100 are pressed upward to push the hooked portions 102. The second side case 1B can be removed from the first side case 1A by removing the hooked state with.

By attaching the second side case 1B, the shaft 40a of the crossbar 40 and the shaft portion 4 of the first trip plate 41 are inserted into the shaft holes 52 and 56 provided on the inner surface of the second side case 1B.
1a is rotatably inserted.

The heads of the adjusting screws 77, 77 'corresponding to the bimetals 45, 46 are exposed through the notches 31e of the partition wall member 31 to the opening 104 opening on the upper surface of the body 1, and after assembly. Of the operation adjusting screw 7 through the opening 104 so that an optimum operating point can be obtained during the operation test of
7, 77 'are screwed to adjust the distance between the tip of the bimetal 45, the leg 41c of the crossbar 40, the tip of the bimetal 46, and the drive piece 42d of the second trip plate 42,
After the adjustment, the lid 106 is fitted into the peripheral portion of the opening 104 of the container 1 by utilizing its elasticity to cover the opening 104.

Here, the bimetals 45 and 46 are arranged side by side in the width direction of the body 1 while being held by the partition member 31 to reduce the size of the body 1 in the width direction. In addition, the second circuit board 74 and the first and third electromagnetic release devices 47 whose displacement directions are mutually along the longitudinal direction of the body 1.
Since it is set away from B and 48, the bimetals 45 and 46 and the first and third electromagnetic release devices 47B and
48 and the zero-phase current transformer ZCT (second circuit board 74) can be narrowed in space to reduce the size of the body 1 in the longitudinal direction.

Further, since the partition walls 31a of the partition member 31 isolate the spaces between the bimetals 45, 46, the partition walls 31a serve to insulate the bimetals 45, 46 from each other and to narrow the intervals. Further, by arranging the zero-phase current transformer ZCT so as to straddle the partition wall 31a in the width direction of the body 1, the braided wire 7 connected to the bimetals 45 and 46 is provided.
9A and 79B are easily penetrated into the zero-phase current transformer ZCT. Further, since the first and third electromagnetic release devices 47B and 48 including the fixed iron core 57 and the movable iron core 58 are also arranged so as to straddle the partition wall 31a in the width direction of the body 1, the fixed iron core 57 and the movable iron core 58 are provided. It is possible to sufficiently increase the width dimension of, and increase the electromagnetic attraction force to shorten the time required to open the main contact.

Thus, the inner storage portion 20 inside the other end of the body 1
0 and the accommodating portion 90 accommodate the selection terminal T2 and the fixed terminal T1, respectively, and one end of the body 1 extends over the end surface and both side surfaces of the body 1 so as to correspond to the terminals T1 and T2. The insertion portions 209a to 209c that are open at the end are formed. Further, a pair of electric wire insertion holes 16A, 16B opened obliquely upward are formed in parallel at one end of the body 1.

Therefore, the load side electric wires are inserted into the electric wire insertion holes 16A and 16B, respectively.
0B, the conductive bar of the voltage pole is plugged and connected to the fixed terminal T1 in the width direction via the plug 209c, and the conductive bar of the neutral pole or the other voltage pole is plugged via the plug 209a or 209b. By inserting and connecting the selection terminal T2 in the width direction, the earth leakage breaker of this embodiment can be inserted in the electric path.

By the way, as shown in FIG. 1, in the vicinity of the opening 104 of the second side case 1B, there is provided a protruding portion 105 through which an insertion hole 105a for inserting the test button 78 penetrates, and the tip is bifurcated. Insert the test button 78 from above from the insertion hole 10
5a to insert the locking step 78a into the insertion hole 10 in the body 1.
The test button 78 is movable in the height direction of the body 1 and is prevented from coming off by being attached to the peripheral edge of the body 5a, and is attached to the protrusion 105. The tip of the test button 78 has a movable contact plate 76a of the test switch SW mounted on the second circuit board 74.
When the test button 78 is pressed, the movable contact plate 76a is pushed and driven by the tip portion of the test button 78 to drive the fixed contact 76.
The test switch SW can be turned on by contacting b. The lid 106 has a semicircular cutout 1 through which the test button 78 is inserted in order to avoid interference with the test button 78.
06a is provided.

Here, the zero-phase current transformer ZC is provided on both sides of the body 1.
Since the window hole 98 that partially exposes the housing 75 of T is opened, it has an insulating property in order to prevent foreign matter from entering the body 1 through the window hole 98 and to improve the appearance. An insulating sheet (not shown) formed of a sheet-shaped material in a rectangular tube shape is attached to the body 1 to cover the window hole 98.

Next, the operation of this embodiment will be described with reference to FIGS. 2, 3 and 12 to 15. FIG. 3 shows an open state, and in this open state, the operating portion 6a of the handle 6 is shown.
Is exposed in an inverted manner from the window hole 50, and the engagement between one end of the operating plate 43 and the first trip plate 41 is disengaged.
The cross bar 40 is urged by the coil spring 62 so as to rotate counterclockwise in FIG. 3, and the movable contactor 4 inserted into the cut groove 54 of the cross bar 40.
A is in a state where the free end is moved upward, and the kerf 5
The movable contactor 4B inserted in 5 has its free end moved upward by its spring elasticity, and the movable contact 3A, 3B provided at each free end corresponds to the fixed contact 2
It is in a state of being separated from A and 2B.

In this state, the operating portion 6a of the handle 6 is shown in FIG.
When it is rotated counterclockwise, the upper shaft 44a of the link 44 is pushed downward, and the link 44 pushes down the operating plate 43 by the lower shaft 44b. This operating plate 4
3 is pushed down, one end (the left end in FIG. 3) of the operating plate 43 hits the locking portion 41e of the first trip plate 41, and the operating plate 43 rotates clockwise in FIG. The other end (right end in FIG. 3) of the operating plate 43 hits a protrusion 84 provided at the upper end of the crossbar 40, and the crossbar 40 is rotated clockwise in FIG. 3 against the spring bias.

By this rotation, the cut groove 55 of the crossbar 40 is formed.
The movable contactor 4B inserted into the flexible contact 4B is bent in the direction of moving the free end downward, and the movable contact 3B at the free end is brought into contact with the fixed contact 2B. Further, the movable contactor 4A inserted into the cut groove 54 rotates clockwise in FIG. 3 to bring the movable contact 3A at its free end into contact with the fixed contact 2A. This contact is delayed from the contact of the movable contact 3B with the fixed contact 2B.

When the handle 6 is further rotated,
The upper shaft 44a moves to the right as shown in FIG. 2 from the line connecting the position of the lower shaft 44b of the link 44 and the center of rotation of the handle 6, and in this state the torsion spring 36 of the handle 6 and the crossbar 44 are attached. The biasing coil spring 62, the spring force of the movable contactor 4B, and the like balance to balance the one end of the operating plate 43 with the first spring.
The latched state of the trip plate 41 with the locking portion 41e is maintained, and the closed state of FIG. 2 is maintained.

When the operating portion 6a of the handle 6 is rotated clockwise in FIG. 2 in the closed state, the position of the upper shaft 44a of the link 44 is such that the line connecting the center of rotation of the handle 6 and the lower shaft 44b. In order to move upward in the left direction in FIG. 2, the latched state between the left end of the operating plate 43 in FIG. 2 and the locking portion 41e of the first trip plate 41 is released, and the crossbar 40 has the coil spring 62 attached. As the force rotates, it rotates counterclockwise in FIG.
The urging force of 6 rapidly returns to the off side. When the crossbar 40 rotates counterclockwise in FIG. 2, the movable contactor 4A rotates counterclockwise in FIG. 2 to move the free end upward so that the movable contact 3A is separated from the fixed contact 2A. Further, the downward movement of the movable contactor 4B disappears, and the spring force restores the original state, so that the movable contact 3B at the free end is separated from the fixed contact 2B. This separation is delayed compared with the separation of the movable contact 3A from the fixed contact 2A. This delay is the same as in the forced opening described later.

Since the opening and closing of the main contacts of both poles is delayed as described above, the arc generated when the contacts are opened and closed is only the movable contact 4A on the rigid body side, and the movable contact made of a spring material. It is possible to prevent consumption due to the 3B arc.

Further, the stoppers 130 formed on both the cases 1A and 1B and the intermediate case 7 in the groove 131 formed in the width direction of the tip end surface of the crossbar 40 which rotates when the main contact is opened.
Engages with and abuts on the bottom of the concave groove 131, eliminating the risk that the arc generated in one section will sneak from the crossbar 40 side on the far side of the body 1 and enter the other section. 1. Prevent short circuit between electrodes due to arc inside.

In the closed state shown in FIG. 2, when an overcurrent flows through the load, the bimetals 45 and 46 generate heat due to the overcurrent and are curvedly displaced. Here, the bimetals 45 and 46 hanging from above are displaced so that the lower ends move to the right in FIG. 2, and the lower ends of the bimetals 46 push the drive piece 42d of the second trip plate 42 to the right in FIG. The lower end of the bimetal 45 pushes the receiving portion 41g at the tip of the leg portion 41c of the first trip plate 41 to the right in FIG. The second tripping plate 42 rotates clockwise in FIG. 2 due to the displacement of the bimetal 46, and the facing portion 42a of the second tripping plate 42 receives the receiving portion 41f of the first tripping plate 41.
Press to the right. Then, the first trip plate 41 has the receiving portion 4
1g is pushed by the bimetal 45 and the receiving portion 41f
Is pushed by the second tripping plate 42, and is rotated counterclockwise in FIG.

When the first trip plate 41 rotates counterclockwise in FIG. 2, the latched state between the locking portion 41e and one end of the actuation plate 43 (the left end in FIG. 2) is released, and the actuation plate 43 is released. It rotates counterclockwise in FIG. 2 around the lower shaft 44b of the link 44. Therefore, the crossbar 4 by the other end (right end in FIG. 2) of the operating plate 43
The regulation of 0 has been eliminated, and the crossbar 40 has a coil spring 62.
2 is rotated counterclockwise by the spring force to return the movable contacts 4A and 4B to the open state, and the movable contact 3
A and 3B are separated from the fixed contacts 2A and 2B, respectively. That is, when an overload current flows in the main circuit,
The thermal release device releases the opening / closing mechanism 5 to forcibly open the main contact to protect the load.

Thereafter, the bimetal 45,
46 returns to the original state, the first trip plate 41 returns to the original position by the bias of the torsion spring 81, and at the same time, the facing portion 42a of the second trip plate 42 is pushed by the receiving portion 41f. The second trip plate 42 is returned to its original position. Further, the handle 6 is rotated in the opening direction (clockwise in FIG. 2) by the bias of the torsion spring 36.

When an abnormally large current such as a short-circuit current (a large short-circuit current due to a circuit short-circuit) flows through the current-carrying conductor 80 of one pole in the above-mentioned closed state, an electromagnetic attraction force is generated in the fixed iron core 57 to move it. The iron core 58 is sucked and rocked. As a result, as shown in FIG. 12, the tip of the movable iron core 58 pushes up the receiving portion 42c of the second trip plate 42 to rotate the second trip plate 42 counterclockwise. When the second trip plate 42 rotates counterclockwise as when an overload current flows, the facing portion 42a of the second trip plate 42 moves the receiving portion 41f of the first trip plate 41 to the left. Push to rotate clockwise. Then, when the first trip plate 41 rotates clockwise, the latched state between the locking portion 41e and one end (right end) of the operating plate 43 is released, and the operating plate 43 centers on the lower shaft 44b of the link 44. As a result, it will rotate clockwise.
Therefore, the crossbar 4 by the other end (left end) of the operating plate 43
The regulation of 0 has been eliminated, and the crossbar 40 has a coil spring 62.
Is rotated clockwise by the spring force of the movable contacts 4A, 4A.
B is returned to the open state, and the movable contacts 3A and 3B are separated from the fixed contacts 2A and 2B, respectively. That is, when an abnormally large current such as a short-circuit current flows through one pole (fixed contact 2B and movable contact 3B) of the main circuit, the second electromagnetic release device 47B releases the opening / closing mechanism 5. The contact can be forcibly opened.

After that, when the electromagnetic attraction force is not generated in the fixed iron core 57 due to the interruption of the electric path, the movable iron core 58 moves to the leaf spring 5
The spring force of 9 returns to the original state, the first trip plate 41 is returned to the original position by the bias of the torsion spring 81, and at the same time, the facing portion 42a of the second trip plate 42 is received by the receiving portion 41f. The second tripping plate 42 is returned to its original position by pushing it. Further, the handle 6 is rotated in the opening direction (counterclockwise) by the bias of the torsion spring 36. The operating current of the second electromagnetic release device 47B is set to a value larger than the cord short circuit current, and as described above, it operates with the short circuit current due to the circuit short circuit (see the solid line C in the figure), but the cord short circuit occurs. It does not operate with current (see solid line B in the figure).

Further, in the above-mentioned closed state, when a leakage current such as a ground fault current flows, the leakage protection circuit 51 causes the coil 68 to move.
The electromagnetic attraction force is generated in the fixed iron core 57 by energizing the movable iron core 58 to attract and swing the movable iron core 58. As shown in FIG. 12, the tip of the movable iron core 58 pushes the receiving portion 42c of the second trip plate 42 to rotate the second trip plate 42 counterclockwise as in the case where the short-circuit current flows. In addition, the first trip plate 41 is rotated clockwise to return the movable contacts 4A, 4B to the open state to move the movable contacts 3A, 3B.
B is separated from the fixed contacts 2A and 2B. That is, when a leakage current flows in the main circuit, the opening / closing mechanism 5 is released by the third electromagnetic release device 48 to forcibly open the main contact to protect the ground fault.

On the other hand, when the cord short circuit current or the short circuit current flows through the bimetal 45 of the other pole in the above-mentioned closed state,
The opening / closing mechanism 5 is released by the first electromagnetic release device 47A to forcibly open the main contact. That is, the operating current of the first electromagnetic release device 47A is set to a value larger than the overcurrent (see the solid line a in FIG. 15A) and smaller than the cord short-circuit current (level in FIG. 15A). B),
It is designed to operate even with a cord short-circuit current whose level is lower than that of the short-circuit current.

When a cord short-circuit current or a short-circuit current flows through the bimetal 45, which is a conducting conductor, the second iron core 60
By the electromagnetic attraction force generated between the magnetic pole surface of the side piece 60b and the first iron core 61, first, the second iron core 60 moves in the direction of approaching the first iron core 61 against the spring force of the return spring 64, After the second iron core 60 moves to the position where the side piece 60a comes into contact with the end surface of the concave groove 31h, the first iron core 61 is further attracted and swung in the direction toward the second iron core 60 by the electromagnetic attraction force. As a result, as shown in FIG. 13, the first trip plate 41, to which the first iron core 61 is attached, rotates counterclockwise in FIG. 13, and the locking portion 41e and one end (left end) of the operating plate 43. The latched state is released and the operating plate 43 rotates counterclockwise about the lower shaft 44b of the link 44. Therefore, the regulation of the crossbar 40 by the other end (right end) of the operating plate 43 is eliminated, and the crossbar 40 is rotated counterclockwise by the spring force of the coil spring 62, and the movable contactor 4 is moved.
A and 4B are returned to the open state, and the movable contacts 3A and 3B are separated from the fixed contacts 2A and 2B, respectively.

In FIG. 15, the bimetal 45 overflows (solid line (a) in the figure), cord short-circuit current (solid line (b) in the figure), short-circuit current (solid line (c) in the figure), and When a load such as a motor or an inverter is started, an inrush current (represented by the solid line D in Fig. 7A, which will be referred to as "instantaneous inrush current") flows instantaneously in a much shorter time than overflow. The figure shows a state in which the first iron core 61 and the second iron core 60 move in the case of. Further, the threshold value of the current when the second iron core 60 starts moving against the spring force of the return spring 64 is shown in FIG.
Is set to level C. Here, FIG. 15B
The horizontal axis in (e) indicates the elapsed time [seconds] from the time when the current exceeding the above-mentioned rating starts to flow, and the vertical axis indicates the positions of the first iron core 61 and the second iron core 60. However, the 1st iron core 6 when only the current below the rating is flowing
The respective positions (initial positions) of the first and second iron cores 60 are
The first iron core 61 is set to P1, the second iron core 60 is set to the zero position on the vertical axis, and the position (moving completion position) when the second iron core 60 moves and comes closest to the first iron core 61 is set to P.
Set to 2. 16 shows a first iron core 61 and a second iron core 60.
The relationship between the electromagnetic attraction force (load during operation) [N] that acts between the two and the distance [mm] between them is shown. When the electromagnetic attraction force exceeds the threshold value X1, the electromagnetic attraction force is added to the spring force of the return spring 64. The second iron core 60 starts to move toward the first iron core 61 in a winning manner, and when the electromagnetic attraction force reaches the threshold value X2, the second iron core 60 reaches the movement completion position P2. When the electromagnetic attraction force further increases from there and exceeds the threshold value X3, the operating plate 43 in the latch state with the spring force of the torsion spring 81 causes the first trip plate 4 to move.
The sum of the loads given to 1 has won the electromagnetic attraction force, and this time the 1st
The iron core 61 starts moving toward the second iron core 60, and when the electromagnetic attraction force reaches the threshold value X4, the latched state between the locking portion 41e of the first trip plate 41 and one end of the operating plate 43 is released. The tripping operation is performed. The operating current (level B) of the first electromagnetic release device 47A is a value based on the distance from the first iron core 61 when the second iron core 60 is at the movement completion position (the current that produces the electromagnetic attraction force of the threshold value X4). Value). In addition, the level A in FIG.
0 is a current level at which the spring starts to move against the spring force of the return spring 64, and level D indicates an operating current when the second iron core 60 is in the initial position.

When the overflow flows into the bimetal 45, as shown in FIG. 15C, the second iron core 60 starts moving from the initial position and moves when the overflow exceeds the level C. Although it moves to the completion position P2, the first iron core 61 does not start moving and stays at the initial position P1 because the overflow does not exceed the level A, so that the main contact is forcibly opened even if the overflow occurs. It will not be done.

On the other hand, when the cord short-circuit current flows through the bimetal 45, the second iron core 60 starts to move from the initial position and moves when the cord short-circuit current exceeds the level C as shown in FIG. 15D. After moving to the completion position P2, the first iron core 61 starts moving from the initial position P1 from the time when the cord short-circuit current exceeds the level A, and then the second iron core 60.
When the cord short-circuit current exceeds the level B and the distance between the second iron core 60 and the first iron core 61 becomes a predetermined value or less, the locking portion 41e of the first trip plate 41 and one end of the operating plate 43 The latched state is released and the tripping operation is performed to forcibly open the main contacts (fixed contact 2A and movable contact 3A).
Further, as shown in FIG. 15E, when the short circuit current flows through the bimetal 45, it is similar to the case where the cord short circuit current flows, but the rise time of the short circuit current is shorter than the rise time of the cord short circuit current. The time from when the current starts flowing to when it reaches the operating current (level A) is shortened, and the start of the tripping operation is accelerated.

However, when the instantaneous inrush current as shown by the solid line D in FIG. 15A flows into the bimetal 45, the instantaneous inrush current flows for a very short time as shown in FIG. 15B. Therefore, the instantaneous inrush current stops flowing before the second iron core 60 that has started moving reaches the movement completion position P2. Therefore, the distance between the first iron core 61 and the second iron core 60 does not fall below a predetermined value, and it is possible to prevent the main contact from being accidentally forcibly opened (see FIG. 14).

(Embodiment 2) In this embodiment, the second iron core 6 is used.
It is characterized in that a return spring 64 that elastically biases the second iron core 60 in a direction separating from the first iron core 61 is interposed between 0 and the body 1, and other configurations are common to the first embodiment. is there. Therefore, the same components as those of the first embodiment are designated by the same reference numerals and the description thereof will be omitted, and only the configuration that is a feature of the present embodiment will be described.

As shown in FIG. 17, a cylindrical spring seat 60c is projectingly provided on the tip surface of the shorter side piece 60a of the second iron core 60, and the concave groove 31 facing the tip surface of the side piece 60a is formed.
A cylindrical spring seat 31i is also projectingly provided on the end surface of one side of h (right side in FIG. 17).
Both ends of the return spring 64 are externally inserted into the c and 31i, and the return spring 64 is interposed between the second iron core 60 and the body 1 (the partition member 31).

If no current exceeding the rating is flowing through the bimetal 45, the second metal as shown in FIG.
The iron core 60 is biased by the spring force of the return spring 64 in a direction away from the first iron core 61, and is held in contact with the peripheral wall 31b of the partition wall member 31. Then, when the current flowing through the bimetal 45 exceeds the level C, the second iron core 60 starts moving toward the first iron core 61 against the spring force of the return spring 64 as shown in FIG. , Return spring 64
The movement of the second iron core 60 stops at the compression limit. When the current flowing through the bimetal 45 further increases and exceeds the level A, the first iron core 61 starts to move toward the second iron core 60, and at the time when the current exceeds the level B, it is shown in FIG. As described above, when the distance between the first iron core 61 and the second iron core 60 becomes equal to or less than a predetermined value, the latched state between the locking portion 41e of the first trip plate 41 and one end of the operating plate 43 is released and the tripping is performed. The operation is performed and the main contacts (fixed contact 2A and movable contact 3A) are forcedly opened.

As described above, in the present embodiment, the second iron core 6
Since the return spring 64 that elastically biases the second iron core 60 in the direction away from the first iron core 61 is interposed between 0 and the body 1, the second iron core 60 and the return spring 64 are provided in the partition member 31. After that, the bimetal 45 and the first iron core 61 can be arranged, which facilitates the assembling work.

(Third Embodiment) In this embodiment, the second iron core 60 in the first and second embodiments is a fixed iron core fixed so as not to move with respect to the partition member 31, and the first iron core (movable iron core) 61 is the first iron core. The force (bias of the torsion spring 81) for movably providing the first trip plate 41 in the direction of contacting and separating from the fixed iron core 60 and urging the first trip plate 41 in the direction of restricting the movement of the operating plate 43. Movable iron core 6 with a force weaker than
It is characterized in that 1 is biased in a direction away from the fixed iron core 60. Thus, the first electromagnetic release device 47A
Since the other configurations are common to those of the first or second embodiment, common components are denoted by the same reference numerals, and description thereof will be omitted.

First electromagnetic release device 4 in this embodiment
7A is provided with a pair of mounting members 66 having a flange portion 66b at the tip of a rod-shaped main portion 66a, penetrates the movable iron core 61 in the front and back, and is larger than the diameter of the main portion 66a and larger than the diameter of the flange portion 66b. The main portion 66a of the mounting member 66 is inserted into each of the pair of through holes 61a having a small diameter, and the rear end of the main portion 66a inserted into the through hole 61a is located at the upper end of the projecting portion 41b of the first trip plate 41. The return spring 64, which is a compression coil spring, is fixed by being press-fitted into a pair of press-fitting holes 41i formed on the surface opposite to the locking portion 41e, and the mounting member 6 is provided.
It is configured to be inserted into the main portion 66a of No. 6 and disposed between the collar portion 66b and the movable iron core 61. That is, the movable iron core 61 is attached to the first trip plate 41 by the attaching member 66 so as to be movable in the direction in which the movable iron core 61 comes in and out of contact with the fixed iron core 60.
The spring force of the return spring 64 elastically biases the fixed iron core 60 away from the fixed iron core 60. The spring force of the return spring 64 is set to be weaker than the spring force of the torsion spring 81 that urges the first trip plate 41 in the direction that restricts the movement of the operation plate 43.

Thus, when the cord short circuit current or the short circuit current flows through the bimetal 45, the electromagnetic attraction force generated between the magnetic pole surface of the side piece 60b of the fixed iron core 60 and the movable iron core 61 first causes the movable iron core 61 to move. Moves toward the flange portion 66b of the mounting member 66 against the spring force of the return spring 64, moves to the compression limit of the return spring 64, and further resists the spring force of the torsion spring 81 by the electromagnetic attraction force. To move the movable iron core 61 toward the fixed iron core 60 by suction and swing.
The first trip plate 41 to which No. 1 is attached is rotated counterclockwise in FIG.

Next, the operation of this embodiment will be described with reference to FIGS. However, the operation when manually switching from the closed state to the open state or from the open state to the closed state, and the operation when the main contact is forcibly opened by the second and third electromagnetic release devices 47B and 48 and the thermal release device Since this is common to the first embodiment, the description thereof will be omitted, and only the operation when the main contact is forcibly opened by the first electromagnetic release device 47A, which is a feature of the present embodiment, will be described.

In the closed state shown in FIG. 20, when a cord short circuit current or a short circuit current flows through the bimetal 45, the opening / closing mechanism 5 is released by the first electromagnetic release device 47A to forcibly open the main contact. That is, as in the first embodiment, the operating current of the first electromagnetic release device 47A overflows (see FIG. 25).
Is set to a value smaller than the cord short-circuit current (level B in FIG. 9A), and the cord short-circuit current having a smaller level than the short-circuit current can operate. It is like this.

When a cord short-circuit current or a short-circuit current flows through the bimetal 45, the movable iron core 61 is first moved by the electromagnetic attraction force generated between the magnetic pole surface of the side piece 60b of the fixed iron core 60 and the movable iron core 61. It moves in the direction of approaching the flange portion 66b of the mounting member 66 against the spring force of the return spring 64, moves to the compression limit of the return spring 64, and further resists the spring force of the torsion spring 81 by the electromagnetic attraction force. The movable iron core 61 is sucked and swung in a direction approaching the fixed iron core 60. As a result, as shown in FIG. 23, the first trip plate 41 to which the movable iron core 61 is attached pivots counterclockwise in FIG. 23, and the locking portion 41e and one end (left end) of the operating plate 43 Is released from the latched state, and the operating plate 43 moves the lower shaft 4 of the link 44.
It will rotate counterclockwise around 4b. Therefore, the cross bar 40 by the other end (right end) of the operating plate 43
Is removed, the crossbar 40 is rotated counterclockwise by the spring force of the coil spring 62, and the movable contacts 4A, 4
B is returned to the open state, and the movable contacts 3A and 3B are separated from the fixed contacts 2A and 2B, respectively.

In FIG. 25, overcurrent flows into the bimetal 45 (solid line (a) in the figure), cord short-circuit current (solid line (b) in the figure), short-circuit current (solid line (c) in the figure), and The figure shows a state in which the movable iron core 61 and the fixed iron core 60 move when an instantaneous inrush current (solid line D in FIG. 9A) flows. In addition, the movable iron core 61 resists the spring force of the return spring 64, and
The threshold value of the current when starting the movement with respect to the trip plate 41 is set to level C in FIG. here,
25 (b) to 25 (e), the horizontal axis represents the elapsed time [seconds] from the time when the current exceeding the rating starts to flow, and the vertical axis represents the positions of the movable iron core 61 and the fixed iron core 60. ing. However, the position P3 of the fixed iron core 60 and the position (initial position) of the movable iron core 61 when only a current equal to or lower than the rated current is taken as the zero position on the vertical axis, and the movable iron core 61 with respect to the first trip plate 41. The position (moving completion position) when the moving member comes closest to the flange portion 66b of the mounting member 66 is referred to as P4. FIG. 26 shows the relationship between the electromagnetic attraction force [N] acting between the movable iron core 61 and the fixed iron core 60 and the distance [mm] between the two. When the electromagnetic attraction force exceeds the threshold value Y1, the return spring 64 is The electromagnetic attraction force overcomes the spring force, and the movable iron core 61 starts to move toward the flange portion 66b with respect to the first trip plate 41. When the electromagnetic attraction force reaches the threshold value Y2, the movable iron core 61 completes the movement. The position P4 is reached. When the electromagnetic attraction force further increases from there and exceeds the threshold value Y3, the torsion spring 81
Of the spring force and the load applied to the first trip plate 41 by the actuating plate 43 in the latched state, the electromagnetic attraction force wins, and the movable iron core 61 starts to move toward the fixed iron core 60. When the threshold value Y4 is reached, the latched state between the locking portion 41e of the first trip plate 41 and one end of the operating plate 43 is released, and the trip operation is performed. The first electromagnetic release device 4
The operating current (level B) of 7A is a value based on the distance between the movable iron core 61 and the fixed iron core 60 when the movable iron core 61 is at the movement completion position P4 (current value that produces the electromagnetic attraction force of the threshold value Y4). In addition, the level A in FIG.
Reference numeral 1 is a current level at which movement starts against the spring force of the return spring 64, and level D shows an operating current when the movable iron core 61 is in the initial position.

When the overflow flows into the bimetal 45, as shown in FIG. 25 (c), the movable iron core 61 starts to move from the initial position when the overflow exceeds the level C, and the movement is completed. Although the movable iron core 61 moves to the position P3 but does not move toward the fixed iron core 60 from the movement completion position P3 because the overflow does not exceed the level A, the main contact is forcibly opened even if the overflow flows. It will not be done.

On the other hand, when the cord short-circuit current flows through the bimetal 45, the movable iron core 61 starts to move from the initial position at the time when the cord short-circuit current exceeds the level C as shown in FIG. After moving to the position P3, the movable iron core 61 is further moved from the movement completion position P3 to the fixed iron core 60 after the cord short circuit current exceeds the level A.
When the cord short-circuit current exceeds level B and the distance between the fixed iron core 60 and the movable iron core 61 becomes a predetermined value or less, the engaging portion 41e of the first trip plate 41 and the operating plate 43 are moved. The latched state with one end of the contact is released and the tripping operation is performed to forcibly open the main contacts (fixed contact 2A and movable contact 3A). Further, as shown in FIG. 25 (e), when the short-circuit current flows through the bimetal 45, it is similar to the case where the cord short-circuit current flows, but the rise time of the short-circuit current is shorter than the rise time of the cord short-circuit current. The time from when the current starts flowing to when it reaches the operating current (level A) is shortened, and the start of the tripping operation is accelerated.

However, when the instantaneous inrush current as shown by the solid line D in FIG. 25A flows into the bimetal 45, the instantaneous inrush current flows for a very short time as shown in FIG. 25B. Therefore, the instantaneous inrush current stops flowing before the movable iron core 61 that has started moving reaches the movement completion position P4. Therefore, the distance between the movable iron core 61 and the fixed iron core 60 does not fall below a predetermined value, and it is possible to prevent the main contact from being accidentally forcibly opened (see FIG. 24).

Here, in the first electromagnetic release device 47A in this embodiment, the return spring 64 externally fitted to the main portion 66a of the mounting member 66 is arranged between the flange portion 66b and the movable iron core 61. The return spring 64 includes the collar portion 66b and the movable iron core 6
It is supported by the main portion 66a of the attachment member 66 between the return spring 64 and 1, and the return spring 64 can be prevented from falling off or buckling. Further, since the first electromagnetic release device 47A is equipped with a plurality of mounting members 66, and the movable iron core 61 is provided with a plurality of through holes 61a through which the main portions 66a of the respective mounting members 66 are inserted, the first tripping device is provided. It is possible to prevent displacement of the movable iron core 61 with respect to the swinging portion (projection portion 41b) of the plate 41 and stabilize the characteristics. Further, since the press-fitting hole 41i for press-fitting the rear end of the main portion 66a of the mounting member 66 is provided at the swinging portion of the first trip plate 41, the return spring 64 and the movable iron core 61 can be easily replaced. The advantage is that

[0126]

According to the first aspect of the present invention, there is provided a body for accommodating the main circuit, a handle at least a part of which is rotatably exposed from the body, and at least a main contact of the main circuit according to an operation of the handle. An opening / closing mechanism for opening / closing and an electromagnetic releasing device for releasing the opening / closing mechanism to forcibly open the main contact when a short-circuit current flows in the main circuit are provided, and the electromagnetic releasing device includes the first iron core and the second iron core. The first core is swingably contacted with and separated from the second core with a current-carrying conductor forming a main circuit interposed therebetween, and the first core is biased in a direction away from the second core. A circuit breaker in which the opening / closing mechanism is released when the first iron core is sucked and the distance between the first iron core and the second iron core falls below a predetermined value. And urge the first iron core away from the second iron core. Since the 2nd iron core was urged away from the 1st iron core by a force weaker than the force, when the current exceeding the rating flows in the current-carrying conductor, the 2nd iron core first moves in the direction in which it contacts the 1st iron core. After that, since the first iron core moves in a direction of coming into contact with the second iron core, when a short-circuit current or a cord short-circuit current flows, the first and second iron cores move in a direction of coming into contact with each other by an electromagnetic attraction force and move to the main contact. Is forcibly opened, but the inrush current that instantaneously flows when the load starts is
Since the iron core stops flowing before it starts moving, the distance between the first iron core and the second iron core does not fall below a predetermined value, and it is possible to prevent the main contact from being forcibly opened by mistake.

According to the invention of claim 2, in the invention of claim 1, a compression spring for elastically urging the second core away from the first core is interposed between the second core and the current-carrying conductor. Since it becomes easy to bring the compression spring into contact with the center position of the second iron core, there is an effect that the second iron core can be moved smoothly.

According to a third aspect of the present invention, in the second aspect of the present invention, the current carrying conductor made of bimetal is fixed at one end and the other end is swingable, and when an overload current flows to the current carrying conductor, an overload occurs. Equipped with a thermal release device that releases the switching mechanism and forcibly opens the main contact by swinging the other end of the current-carrying conductor due to the temperature rise due to the current. Since the compression spring is interposed at the position, there is an effect that the variation of the distance between the compression spring and the second iron core when the other end of the current-carrying conductor swings can be suppressed and the displacement and the falling of the compression spring can be prevented. is there.

According to the invention of claim 4, in the invention of claim 1, a compression spring for elastically urging the second core away from the first core is interposed between the second core and the body. The current-carrying conductor and the first iron core can be arranged after the second iron core and the compression spring are arranged in the body, which has the effect of facilitating the assembling work.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects of the invention, a latch member for latching the main contact in a closed state and a swingable arrangement in the body for opening the main contact are provided. An opening / closing mechanism that restricts the movement of the latch member that shifts to the polar state and that releases the restriction when the distance between the first core and the second core included in the electromagnetic release device is less than a predetermined value Since the first iron core is attached to the swinging portion of the trip member in the electromagnetic release device,
A member for transmitting the movement of the iron core to the tripping member is not necessary, and the number of parts can be reduced, and the distance between the first iron core and the tripping member can be shortened, thereby achieving size reduction.

According to a sixth aspect of the present invention, a body for housing the main circuit, a handle at least a part of which is rotatably exposed from the body, and a main contact of the main circuit are opened / closed at least in accordance with an operation of the handle. It is equipped with an opening / closing mechanism and an electromagnetic release device that releases the opening / closing mechanism and forcibly opens the main contact when a short-circuit current flows in the main circuit.The opening / closing mechanism latches the main contact in a closed state. The member and the latch member, which is swingably disposed in the body and moves the main contact to the open state, regulates the movement of the latch member and is urged in the direction of regulating the movement of the latch member, so that a short-circuit current flows to the main circuit. A tripping member that is swung in the direction of releasing the regulation by the electromagnetic release device when the electromagnetic release device flows, the electromagnetic release device is provided in a direction in which the fixed iron core is brought into contact with or separated from the swinging portion of the tripping member. A movable iron core that can be moved freely And a fixed iron core that is fixed to the body so as to sandwich the current-carrying conductor that forms the contact between the movable iron core and the movable iron core, and moves the trip member with a force weaker than the force that biases the trip member in the direction that restricts the movement of the latch member. Since the iron core is biased in a direction away from the fixed iron core, the fixed iron core sucks the movable iron core, and when the distance between the movable iron core and the fixed iron core falls below a predetermined value, the regulation by the trip member is released. When a current exceeding the rating flows in the current-carrying conductor, the movable iron core first moves in the direction in which it contacts the fixed iron core with respect to the swinging part of the trip member, and then the movable iron core is fixed while swinging the trip member. Since it moves in the direction of contact with the iron core, when a short-circuit current or a cord short-circuit current flows, the movable iron core moves in the direction of contacting the fixed iron core while swinging the tripping member, and the main contact is forcibly opened. , A bump that flows instantly when the load starts The electric current stops flowing before the movable core starts to move while swinging the tripping member, so the distance between the movable core and the fixed core does not fall below a specified value, and the main contact is accidentally forcibly opened. There is an effect that can prevent.

According to a seventh aspect of the invention, in the invention of the sixth aspect, a mounting member having a brim portion at the tip of the rod-shaped main portion is provided in the electromagnetic release device, and the movable iron core is penetrated through the front and back sides to obtain a diameter of the main portion. Is larger than the diameter of the flange portion, the main portion of the mounting member is inserted into the through hole, and the rear end of the main portion inserted into the through hole is fixed to the swinging portion of the tripping member. Since the compression coil spring extrapolated to the main part of the is arranged between the collar part and the movable iron core, the compression coil spring is supported by the main part of the mounting member between the collar part and the movable iron core. This has the effect of preventing the coil spring from falling off and buckling.

According to the invention of claim 8, in the invention of claim 7, the plurality of mounting members are provided in the electromagnetic release device, and the plurality of through holes for inserting the main parts of the respective mounting members are provided in the movable iron core. There is an effect that it is possible to prevent the displacement of the movable core with respect to the swinging portion of the trip member and stabilize the characteristics.

According to a ninth aspect of the invention, in the seventh or eighth aspect of the invention, since the press-fitting hole into which the rear end of the main portion of the mounting member is pressably inserted is provided in the swinging portion of the trip member, the compression spring is provided. It has the effect that the movable iron core can be easily replaced.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a first embodiment.

FIG. 2 is a side view showing the same loading state, with the first side case removed.

FIG. 3 is a side view showing the open state of the above, with a first side case removed.

FIG. 4 is a rear sectional view of the above.

FIG. 5 is an exploded perspective view of the first electromagnetic release device and the thermal release device of the above.

FIG. 6 is an exploded perspective view of second and third electromagnetic release devices of the above.

FIG. 7 is a perspective view of second and third electromagnetic release devices of the above.

FIG. 8 is a circuit diagram of a leakage protection circuit and a test circuit in the above.

FIG. 9 is an exploded perspective view of structural parts of the zero-phase current transformer and the first and second circuit boards of the above.

FIG. 10 is a perspective view of the structural parts of the zero-phase current transformer and the first and second circuit boards of the above.

FIG. 11 is a rear sectional view of the above.

FIG. 12 is a side view showing a state in which the second electromagnetic release device has been operated from the above-mentioned closed state, with the second side case removed.

FIG. 13 is a side view showing a state in which the first electromagnetic release device has operated from the above-mentioned closed state, with the first side case removed.

FIG. 14 is a side view showing a state in which the second iron core of the first electromagnetic release device has moved from the throwing state in the above, with the first side case removed.

15 (a) to 15 (e) are operation explanatory views of the first electromagnetic release device in the above.

FIG. 16 is an operation explanatory view of the first electromagnetic release device in the above.

FIG. 17 is an exploded perspective view of a first electromagnetic release device and a thermal release device according to the second embodiment.

18 (a) to (c) are operation explanatory views of the first electromagnetic release device in the above.

FIG. 19 is an exploded perspective view of a first trip plate and a movable core according to the third embodiment.

FIG. 20 is a side view showing the loading state of the above, with the first side case removed.

FIG. 21 is a side view showing the open state of the above, with the first side case removed.

FIG. 22 is a side view showing the opened state of the above, with the second side case removed.

FIG. 23 is a side view showing a state in which the first electromagnetic release device is operated and the main contact is opened from the closed state, and the first-side case is removed.

FIG. 24 is a side view showing a state in which the movable iron core of the first electromagnetic release device has moved only with respect to the first trip plate from the above-mentioned closed state, with the first side case removed.

25 (a) to (e) are operation explanatory views of the first electromagnetic release device in the above.

FIG. 26 is an operation explanatory view of the first electromagnetic release device in the above.

27 (a) to 27 (e) are operation explanatory views of the electromagnetic releasing device in the conventional example.

[Explanation of symbols]

1 body 2A, 2B fixed contact 3A, 3B movable contact 5 open / close mechanism 6 handles 41 First Tripping Plate 45 bimetal 47A First electromagnetic release device 60 second iron core 61 No. 1 iron core 64 Return spring 81 torsion spring

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takuya Kagawa             1048, Kadoma, Kadoma-shi, Osaka Matsushita Electric Works Co., Ltd.             Inside the company (72) Inventor Takashi Inagi             1048, Kadoma, Kadoma-shi, Osaka Matsushita Electric Works Co., Ltd.             Inside the company (72) Inventor Koichi Yamazoe             1048, Kadoma, Kadoma-shi, Osaka Matsushita Electric Works Co., Ltd.             Inside the company (72) Inventor Toshihiro Oido             1048, Kadoma, Kadoma-shi, Osaka Matsushita Electric Works Co., Ltd.             Inside the company (72) Inventor Hiroshi Fujiki             1048, Kadoma, Kadoma-shi, Osaka Matsushita Electric Works Co., Ltd.             Inside the company F-term (reference) 5G030 BA06 FC11 XX02

Claims (9)

[Claims] 1. A body for accommodating a main circuit, a handle at least a part of which is rotatably exposed from the body, an opening / closing mechanism for opening and closing a main contact of the main circuit in accordance with operation of the handle, and a short circuit. An electromagnetic release device for releasing the switching mechanism to forcibly open the main contact when an electric current flows in the main circuit, the electromagnetic release device comprising a first iron core and a second iron core,
The first iron core is pivotally connected to and separated from the second iron core so as to sandwich the current-carrying conductor forming the main circuit therebetween, and the first iron core is moved to the second iron core.
In the circuit breaker, which is biased in a direction away from the iron core so that the second iron core attracts the first iron core and releases the opening / closing mechanism when the distance between the first iron core and the second iron core is less than a predetermined value, Two
The iron core is movably arranged in a direction of moving toward and away from the first iron core, and the second iron core is moved away from the first iron core with a force weaker than the force for urging the first iron core away from the second iron core. Circuit breaker characterized by being energized. 2. The circuit breaker according to claim 1, wherein a compression spring that elastically biases the second core away from the first core is interposed between the second core and the current-carrying conductor. 3. A current carrying conductor made of bimetal is fixed at one end, and the other end is swingable, and when an overload current flows through the current carrying conductor, the other end of the current carrying conductor is shaken due to a temperature rise due to the overload current. It is equipped with a thermal release device that releases the opening / closing mechanism to forcibly open the main contact by moving, and a compression spring is interposed at a position near the one end side fixed from the center of the current-carrying conductor. The circuit breaker according to claim 2. 4. A first iron core is provided between the second iron core and the body.
The circuit breaker according to claim 1, further comprising a compression spring that elastically biases the core away from the iron core. 5. A latch member for latching the main contact in a closed state and a latch member for swinging in the body to restrict the movement of the latch member for shifting the main contact to an open state and an electromagnetic release device are provided. The opening / closing mechanism is provided with a tripping member that releases the regulation when the distance between the first iron core and the second iron core is less than a predetermined value, and the first iron core is provided at the swinging portion of the tripping member. It attached, The circuit breaker in any one of Claims 1-4. 6. A body for accommodating a main circuit, a handle at least a part of which is rotatably exposed from the body, an opening / closing mechanism for opening and closing a main contact of the main circuit according to at least operation of the handle, and a short circuit. An electromagnetic release device for releasing the opening / closing mechanism to forcibly open the main contact when an electric current flows in the main circuit is provided.The opening / closing mechanism includes a latch member for latching the main contact in a closed state and an inside of the body. Is swingably mounted on the main contact to restrict the movement of the latch member that shifts the main contact to the open state, and is biased in a direction that restricts the movement of the latch member. A tripping member that is swung in a direction to release the regulation by a release device,
The electromagnetic release device is a device in which a movable core provided so as to move toward and away from a fixed core with respect to a swinging portion of a trip member and a conducting core forming a main circuit are sandwiched between the movable core. With a fixed iron core fixed to the body, the movable iron core is urged in a direction away from the fixed iron core by a force weaker than the force that urges the trip member in the direction that restricts the movement of the latch member, and the fixed iron core moves. A circuit breaker characterized in that the regulation by the trip member is released when the distance between the movable iron core and the fixed iron core falls below a predetermined value by sucking the iron core. 7. An electromagnetic release device comprising a mounting member having a collar portion at the tip of a rod-shaped main portion, the movable core passing through the front and back sides, and having a diameter larger than the diameter of the main portion and smaller than the diameter of the collar portion. The main part of the mounting member is inserted into the through hole having, and the rear end of the main part inserted into the through hole is fixed to the swinging part of the trip member,
7. The circuit breaker according to claim 6, wherein a compression coil spring externally inserted in the main portion of the mounting member is arranged between the flange portion and the movable iron core. 8. The circuit breaker according to claim 7, wherein the electromagnetic release device is provided with a plurality of mounting members, and the movable core has a plurality of through holes through which main portions of the mounting members are inserted. . 9. The circuit breaker according to claim 7, wherein a press-fitting hole for press-fitting the rear end of the main portion of the mounting member is inserted and removed so as to be provided at the swinging portion of the trip member.