JP2003272508A - Earth leakage breaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an earth leakage breaker capable of saving space and achieving miniaturization by decreasing the number of component parts. <P>SOLUTION: The opening/closing mechanism 5 of this earth leakage breaker is composed of a first tripping plate 41 furnished with an actuator plate 43 and a stepped form engagement part 41e to engage one end of the actuator plate 43, a second tripping plate 42, a handle 6, a channel-shaped link 44, etc. When an abnormally large current flows in the condition that one of the main contacts is closed, a first electromagnetic release device 47B releases the opening/closing mechanism 5 to open the main contact forcedly; when an abnormally large current flows alike in the condition that the other main contact is closed, a second electromagnetic release device 47A does the same; and when a leak current flows in the main circuit, a third electromagnetic release device 48 does the same. The third electromagnetic release device 48 makes co-use of a stationary core 57, a moving core 58, and a leaf spring 59 by winding a coil 68 for magnetization round the stationary core 57 of the first electromagnetic release device 47B. This enables decreasing the number of component parts to lead to saving the space and miniaturization of the device. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-pole type earth leakage circuit breaker having two-pole main contacts, and more particularly to an electromagnetic release device for protecting each pole from an abnormally large current due to a ground fault accident or a short circuit accident. The present invention relates to an earth leakage breaker provided.

[0002]

2. Description of the Related Art As a conventional two-pole type earth leakage breaker, there is one disclosed in Japanese Patent Application Laid-Open No. 11-25841. This earth leakage breaker has an electromagnetic release device that releases the switching mechanism and forcibly opens the main contact when an abnormally large current flows to the main contact due to a ground fault or short circuit accident. The switching mechanism is equipped with a coil that is energized when a leakage current is detected by a zero-phase current transformer installed on the bottom side of the body separately from these electromagnetic release devices. An electromagnetic release device for earth leakage protection, which releases the main body and forcibly opens the main contact, was provided inside the body.

[0003]

In the above-mentioned conventional example, two electromagnetic release devices for releasing the opening / closing mechanism when an abnormally large current flows due to a ground fault or a short-circuit accident for each pole, and leakage. Since three independent electromagnetic release devices for leakage protection, which release the switching mechanism by energizing the coil by current detection, are used, the number of parts increases and space is not saved. There was a problem that it would become large.

The present invention has been made in view of the above problems, and its object is to reduce the number of parts while protecting each pole from an abnormally large current due to a ground fault accident or a short circuit accident. An object of the present invention is to provide an earth leakage breaker that can be reduced in size and space.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the invention according to claim 1 accommodates a main circuit having a two-pole main contact, and at least a part thereof is rotated from the main body. A freely exposed handle, an open / close mechanism that opens and closes the main contact of the main circuit according to at least the operation of the handle, and when an abnormally large current flows into one of the main contacts of the main circuit due to a ground fault or short-circuit accident. A first electromagnetic release device that releases the switching mechanism to forcibly open the main contact, and releases the switching mechanism to force the main contact when the abnormal large current flows to the other main contact of the main circuit. Second electromagnetic release device that is opened automatically, leakage current detection means that detects leakage current, and when leakage current is detected by the leakage current detection means, the switching mechanism is released to forcibly open the main contact. A third electromagnetic release device having a pole, and the first and second
The electromagnetic release device is equipped with a movable iron core that swingably contacts with and separates from the fixed iron core by sandwiching the current-carrying conductor of each pole forming the main circuit with the fixed iron core, and the movable iron core is attracted to the fixed iron core. In this case, the opening / closing mechanism is released, and the third electromagnetic release device is characterized in that a coil is wound around a fixed iron core included in the first electromagnetic release device. By using the constituent fixed iron cores and movable iron cores also as the third electromagnetic release device for earth leakage protection, the number of parts can be reduced compared to the past, and abnormalities due to ground faults or short circuit accidents can be made for each pole. Space saving and downsizing can be achieved while protecting from such a large current.

According to a second aspect of the present invention, in the first aspect of the present invention, the opening / closing mechanism regulates movements of a latch member for latching the main contact in a closed state and a latch member for shifting the main contact to an open state. And a trip member whose regulation is released by the first to third electromagnetic release devices, and the movable iron core of the second electromagnetic release device is attached to the trip member. A member for transmitting the movement of the movable iron core to the tripping member is not required, the number of parts can be further reduced, and the distance between the movable iron core and the tripping member can be shortened to further reduce the size.

According to a third aspect of the present invention, in the second aspect of the invention, the first electromagnetic release device is disposed on the fixed iron core side of the second electromagnetic release device in the body, and the movable iron core moves in a second electromagnetic direction. The leak current detecting means is housed so as to be substantially orthogonal to the operation direction of the movable iron core in the release device, and the leakage current detecting means is arranged at a position in the body facing the fixed iron cores of the first and second electromagnetic release devices. The movable iron cores and the tripping members of the first and second electromagnetic release devices can be sufficiently secured in the operating space, and the space inside the body can be effectively used to achieve further miniaturization.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to FIG.
~ It demonstrates in detail with reference to FIG.

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 so as to be sandwiched between both side cases 1A and 1B in one end portion of the body 1 in the longitudinal direction.
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 extends outwardly integrally with 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 locking spring 13A and the terminal plate 11 constitute a quick-connect terminal which is a conductor connecting portion, and 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 contact 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 protrusion 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 form 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. In the release handle 17', the rotary shaft 18 provided on the lower side surface is the convex flat portion 22 of the intermediate case 7 like the release handle 17 described above. 'A shaft 38 rotatably supported in a shaft hole 20 provided in the second side case 1B and protruding from an inner wall surface of the second side case 1B is rotatably supported in a recess 37 formed on a side surface of the second side case 1B. When the operating portion 17a exposed to the outside of the body 1 is manually operated and rotated, the driving projection 19 provided at the lower end pushes the tip of one 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 side 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. (See FIG. 3). 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 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 voltage electrode at the bottom
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.

Both the fixed terminal T1 and the selection terminal T2 are substantially U-shaped, and are composed of blade receiving springs that are expanded toward the tips after the tips of the two vertically parallel side pieces 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 respectively corresponding to the two conductive bars of the neutral pole and the voltage pole, and is housed inside the first side case 1A. 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.

As a display means for displaying whether the selection terminal T2 is located at the position corresponding to the conductive bar of the neutral pole or the voltage pole, on the wall corresponding to the ceiling of the inner housing portion 200 of the body 1. , The through hole 2 communicating 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 the shape of a frame 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 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 section 200 so as to be vertically movable. 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 protrusion 206 is a slide groove (not shown) formed above the bottom surface of the first side case 1A on the outside of the side wall of the first side case 1A constituting the side wall of the inner storage section 200. It is inserted into the slide groove from an insertion hole (not shown) opened at the bottom of the upper end so as to communicate with the inner storage portion 200, and is vertically slidable in the slide groove together with the leg pieces 83a.

The slide groove and the insertion hole constitute a guide portion for vertically moving the slide member 83 having the selection terminal T2 mounted, and the bottom portion of the slide groove is the inner storage portion 200.
The rear surface of the leg piece 83a that is formed so as to project inward and is inserted into the slide groove through the insertion hole formed in the upper end bottom portion of the slide groove can be slidably contacted with the bottom portion of the slide groove. There is. In addition, the protrusion 2 is located at the top of the slide groove.
A protrusion (not shown) is provided that abuts when 06 moves to the upper end of the slide groove.

Thus, the protruding portion 206 has the inner storage portion 200.
If an operating portion for vertically moving the selection terminal T2 in the inside is configured and the projecting portion 206 is held from the outside of the body 1 or is pushed up or down by a driver or the like to slide in the slide groove, the slide movement is performed. Accordingly, the slide member 83 in the inner storage portion 200 moves up or down together with the selection terminal T2 by the guide 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, 4B to open / close has the operation plate 43 as a latch member, the crossbar 40, and the stepped locking portion 4 for locking one end of the operation 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 of the main contacts (fixed contact 2B and movable contact 3B), the first electromagnetic release device 47B causes the other main contact (fixed contact). In the closed state of the contact 2A and the movable contact 3A), if an abnormally large current flows due to a ground fault or a short-circuit accident as well, the second electromagnetic release device 47A is used to protect the leakage current if a leakage current flows to the main circuit. When an overcurrent such as an overload current further flows by the third electromagnetic releasing device 48, the switching mechanism 5 is released by the thermal releasing device to forcefully 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 projecting 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 formed in the second side case 1B and the shaft hole 49 formed in the inner surface of the second side case 1B, and held between the two 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 of 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 the two side cases 1A and 1B by inserting shafts 40a projecting from the 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. 3, a kerf 54 for laterally fitting the side portion of the movable contactor 4A on the side portion on the first side case 1A side slightly below the shaft 40a, and a lower portion 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 projecting from the inner surface of the side wall of the intermediate case 7 and the first case 1A on the end surface of the movable contact 3 when the movable contacts 3A, 3B are separated from the fixed contacts 2A, 2B. A recessed groove 131 is formed in the width direction so as to be engaged with and contact the bottom thereof (see FIG. 12).

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 when the crossbar 40 is rotated in the closing operation direction, it is pushed downward to bend, and from this bent state, the crossbar 40 moves 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 trip 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 and 56 provided on the inner side surfaces of the both-side cases 1A and 1B, and are rotatably supported between the both-side cases 1A and 1B.
A locking portion 41e is formed at the upper end of the protruding portion 41b to engage and disengage one end of the actuating plate 43, and a receiving portion 41 driven by a bimetal 45, which will be described later, is provided on the tip side surface of one leg 41c.
In addition to projecting g, a receiving portion 41f that is driven by the second trip plate 42 is projected on the tip side surface of the other leg 41d.

The second trip plate 42 is formed in a substantially V shape in which the facing portion 42a and the receiving portion 42c are projected from the central portion having the shaft hole 42b, and the shaft 31f provided in the partition wall member 31 described later is provided with 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 portion where one bimetal 45 is fixed to 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.

By the way, 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 second electromagnetic releasing device 47A, as shown in FIG. 5, a pair of side pieces 60a, 60 of magnetic iron plates having different lengths are used.
Fixed iron core 60 formed by bending into a substantially U shape in plan view having b
And a movable iron core 61 made of a rectangular flat magnetic iron plate. The fixed 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 60a is placed in the concave groove 31h provided in the partition wall 31a. Are housed in the recess 31c in a form of fitting and are sandwiched between the bimetal 45 and the peripheral wall 31b (see FIG. 3). On the other hand, the movable iron core 61 is formed with a pair of through holes 61a penetrating in the thickness direction, and a pair of through holes 61a protruding from the surface of the upper end of the protruding portion 41b of the first trip plate 41 opposite to the locking portion 41e. The projection 41h through the through hole 61a
It is attached to the first tripping plate 41 by inserting it into the first trip plate 41, and as shown in FIG. 3, the other side (longer side) of the fixed iron core 60.
Faces the magnetic pole surface that is the tip of the side piece 60b.

Thus, when an abnormally large current due to a ground fault or short-circuit accident flows through the bimetal 45 of one pole including the main contact (fixed contact 2A and movable contact 3A), the fixed iron core 6
The movable iron core 61 is attracted and swung by the electromagnetic attraction force generated on the magnetic pole surface of the side piece 60b of 0, and the first trip plate 41 to which the movable iron core 61 is attached is rotated counterclockwise in FIG. Of. By attaching the movable iron core 61 to the first trip plate 41 in this manner, a member for transmitting the movement of the movable iron core 61 to the first trip plate 41 (for example, the second electromagnetic release device 47B in the second electromagnetic release device 47B). (Such as the trip plate 42) is not necessary, the number of parts can be reduced, and the distance between the movable iron core 61 and the first trip plate 41 can be shortened to achieve miniaturization.

As shown in FIG. 6, the first electromagnetic release device 47B includes 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 plate-shaped 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.

The movable iron core 58 has protrusions 58a, 58a protruding from the surface on the side of the fixed iron core 57, and a 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 due to a ground fault accident or a short circuit accident 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. In addition, the fixed iron core 57 and the movable iron core 58 are connected to the leaf spring 5 in this way.
Since it is connected by 9 and made into a block, the work of assembling the first electromagnetic release device 47B into the container 1 becomes easy as will be described later.

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 by the current flowing through the inner piece 80a of the conducting conductor 80, and the both sides of the fixed iron core 57 by the current flowing through the outer piece 80b. The directions of the electromagnetic attraction force generated on the magnetic pole surfaces of the pieces 57a, 57a are 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 fixed iron core 57 of the first electromagnetic release device 47B is energized by the coil 6 for excitation.
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, operates 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 first electromagnetic release device 47B.
7. Since the movable iron core 58 and the leaf spring 59 can be used also as the third electromagnetic release device 48 for leakage protection, an electromagnetic release device for large current protection and an electromagnetic release device for leakage protection can be provided for each pole. The number of parts can be reduced and space saving and miniaturization can be achieved as compared with the related art in which 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 the circuit configuration shown in FIG. 8, and has a circuit for the voltage pole of the main circuit (braided wire 7).
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 connected in series to the two poles of the main circuit. 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 that constitute the leakage protection circuit 51 are mounted on the first and second circuit boards 73 and 74, and the first and second circuit components on both sides in the thickness direction of the zero-phase current transformer ZCT are mounted. 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.

Thus, in assembling the earth leakage 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 placed.
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.

Further, when the fixed terminal T1 is housed in the housing portion 90 provided at the bottom of the other end of the body 1, and the selection terminal T2 together with the slide member 83 is butted with 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 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, a separation wall 91 formed in the height direction of the first side case 1A along the inner storage portion 200, and a first wall
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 of the housing 75 having the largest width 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 first 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 having the rear end 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 partition wall 95 extending from the lower end of the separation wall 65 toward the other end of the first side case 1A in parallel to the bottom part, and extending from the parallel part with an inclination upward and the bottom part 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 through the notch 14a (see FIG. 2). 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. At this time, the first circuit board 73 and the lead wire 8 are provided between the bottom of the first side case 1A and the movable contactor 4B.
The connection member 99 connected by 2B is sandwiched and fixed, and the leakage protection circuit 51 and the test circuit 70 are connected to the electric path 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 fixed iron core 60 is placed in the recess 31c, the first tripping plate 41 is rotatably placed in a fixed position together with the torsion spring 81, and the second tripping plate 42 is turned in a fixed position. Place it freely. 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 being arranged and assembled, the intermediate case 7 in which the terminal block 10B, the release handle 17 'and the return spring 21' are assembled in the recess 9 is arranged so as to overlap the first side case 1A side.

When the intermediate case 7 is arranged at a fixed position on the first side case 1A side, the free end side of the movable contactor 4A is arranged 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 fits into the recess 37 of the release handle 17.

On the other hand, the fixed contact 12B provided on the terminal block 10B is placed on the rib 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 and coupled. 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 in 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 opened on the upper surface of the body 1, and after assembly. Of the operation adjusting screw 7 through the opening 104 so that the 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 wall 31a of the partition member 31 isolates the bimetals 45 and 46 from each other, the partition wall 31a serves to insulate the two bimetals 45 and 46 from each other and to reduce the spacing therebetween. 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.

Furthermore, in the present embodiment, the first electromagnetic release device 47B is replaced with the second electromagnetic release device 47 in the body 1.
To the side of the fixed iron core 60 of A, the moving direction of the movable iron core 58 (see FIG.
(In the up and down direction in FIG. 3) is housed so that the movable iron core 61 in the second electromagnetic release device 47A is substantially orthogonal to the operation direction (left and right direction in FIG. 3), and the fixed iron cores of the first and second electromagnetic release devices 47B and 47A Body 1 facing 57 and 60
Since the circuit block of the leakage protection circuit 51 including the zero-phase current transformer ZCT is arranged at the inner position, the movable iron cores 58 and 61 and the tripping member (the first and second electromagnetic release devices 47B and 47A) (first It is possible to secure a sufficient operation space for the first trip plate 41 and the second trip plate 42), and the body 1
There is an advantage that the internal space can be effectively used and further miniaturization can be achieved.

Thus, the inner housing 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 projecting base 105 through which an insertion hole 105a for inserting the test button 78 penetrates, and the tip is formed into a fork. 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. 12 and 13
Indicates an open state, and the handle 6 is in this open state.
The operating portion 6a of the
The engagement state between the one end of the operating plate 43 and the first trip plate 41 is in a disengaged state. The cross bar 40 is urged by the coil spring 62 to rotate clockwise (counterclockwise in FIG. 13) in FIG. 12, and the movable contact inserted in the cut groove 54 of the cross bar 40. The child 4A has its free end moved upward, and the movable contactor 4B inserted into the cut groove 55 has its free end moved upward by its spring elastic force. Fixed contacts 2A, 2B corresponding to movable contacts 3A, 3B provided in
Is separated from.

In this state, the operation portion 6a of the handle 6 is shown in FIG.
2 is rotated clockwise (counterclockwise in FIG. 13), the upper shaft 44a of the link 44 is pushed downward and the link 44 is moved by the lower shaft 44b.
Push 3 down. By pushing down the operating plate 43, one end (the right end in FIG. 12) of the operating plate 43 is moved to the first trip plate 4.
12, the operating plate 43 rotates counterclockwise in FIG. 12 (clockwise in FIG. 13), and the other end (left end in FIG. 12) of the operating plate 43 hits the locking portion 41e of FIG. Upon hitting the protrusion 84 provided on the upper end of the crossbar 40, the crossbar 40 is rotated counterclockwise in FIG. 12 (clockwise in FIG. 13) 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. The movable contactor 4A inserted into the cut groove 54 rotates counterclockwise in FIG. 12 (clockwise in FIG. 13) 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 leftward (rightward in FIG. 3) 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 twists the handle 6 in this state. The spring 36, the coil spring 62 for urging the crossbar 44, the spring force of the movable contactor 4B, and the like are balanced so that one end of the actuating plate 43 and the engaging portion 41e of the first trip plate 41.
And the latched state is maintained, and the closed state of FIGS. 2 and 3 is maintained.

When the operating portion 6a of the handle 6 is turned counterclockwise in FIG. 2 (counterclockwise in FIG. 3) in the closed state, the position of the upper shaft 44a of the link 44 becomes the rotation center of the handle 6. , The right end in FIG. 2 (left end in FIG. 3) of the operating plate 43 and the first trip plate 41 in order to move upward in the right direction in FIG. 2 (left direction in FIG. 3) connecting the lower shaft 44b. 2 is released from the latched state with the locking portion 41e, and the crossbar 40 is rotated clockwise in FIG. 2 (counterclockwise in FIG. 3) by the biasing force of the coil spring 62.
The handle 6 is rapidly rotated back to the off side by the urging force of the torsion spring 36. Rotation of the crossbar 40 in the clockwise direction in FIG. 2 (counterclockwise in FIG. 3) causes the movable contactor 4A to rotate in the clockwise direction in FIG. 2 (counterclockwise in FIG. 3) to move the free end upward. The movable contact 3A is moved to separate 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 / closing of the main contacts of both poles is delayed as described above, the arc generated when the contacts are opened / closed is only the movable contact 4A on the rigid 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 front 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 FIGS. 2 and 3, when an overcurrent flows through the load, the bimetals 45 and 46 are discharged.
Will generate heat due to overcurrent and will be curved and displaced. Here, the lower ends of the bimetals 45 and 46 hanging from above are shown in FIG.
2, the lower end of the bimetal 46 pushes the drive piece 42d of the second trip plate 42 leftward in FIG. 2, and the lower end of the bimetal 45 moves to the first pull. The receiving portion 41g at the tip of the leg portion 41c of the removing plate 41 is pushed rightward in FIG. Then, the displacement of the bimetal 46 causes the second trip plate 42 to rotate counterclockwise in FIG. 2, and the facing portion 42 a of the second trip plate 42.
Pushes the receiving portion 41f of the first trip plate 41 leftward. The receiving portion 41g of the first trip plate 41 is made of bimetal 4.
5 and the receiving portion 41f causes the second trip plate 42 to move.
When it is pushed by, it rotates clockwise in FIG. 2 (counterclockwise in FIG. 3).

When the first trip plate 41 rotates clockwise in FIG. 2 (counterclockwise in FIG. 3), the latched state between the locking portion 41e and one end of the actuating plate 43 (right end in FIG. 2) is released. After being released, the operation plate 43 is rotated about the lower shaft 44b of the link 44 in the clockwise direction in FIG. 2 (counterclockwise direction in FIG. 3). Therefore, the cross bar 40 by the other end (the left end in FIG. 2) of the operating plate 43
2 is removed, the crossbar 40 is rotated clockwise (counterclockwise in FIG. 3) in FIG. 2 by the spring force of the coil spring 62 to return the movable contacts 4A, 4B to the open state, and the movable contact 3A. , 3B are separated from the fixed contacts 2A, 2B, respectively. That is, when an overload current flows in the main circuit, the switching mechanism 5 is released by the thermal release device to forcibly open the main contact to protect the load.

After that, 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 (counterclockwise in FIG. 2) by the bias of the torsion spring 36.

Further, in the above-mentioned closed state, when an abnormally large current due to a ground fault or a short circuit accident flows through the current-carrying conductor 80 of one pole, an electromagnetic attraction force is generated in the fixed iron core 57 to attract the movable iron core 58. Rock. As a result, as shown in FIG. 14, 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 second trip plate 4 is rotated.
The second facing portion 42a pushes the receiving portion 41f of the first trip plate 41 to the left and rotates 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 regulation of the crossbar 40 by the other end (left end) of the operating plate 43 is eliminated, and the crossbar 40 is rotated clockwise (counterclockwise in FIG. 15) by the spring force of the coil spring 62, and the movable contactor 4A. , 4B are returned to the open state, and movable contacts 3A, 3B
Are separated from the fixed contacts 2A and 2B, respectively. That is, one pole of the main circuit (fixed contact 2B and movable contact 3
When an abnormally large current flows in B), the opening / closing mechanism 5 is released by the first electromagnetic release device 47B and the main 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.

On the other hand, in the above-mentioned closed state, an abnormally large current due to a ground fault or short circuit accident causes a bimetal 45 on the other pole.
Then, an electromagnetic attraction force is generated in the fixed iron core 60 to attract and swing the movable iron core 61. As a result, the first trip plate 41 to which the movable iron core 61 is attached rotates counterclockwise in FIG. 15, and the latched state between the locking portion 41e and one end (left end) of the operating plate 43 is released. 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,
The movable contacts 4A 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. That is, when an abnormally large current flows through the other pole (fixed contact 2A and movable contact 3A) of the main circuit, the switching mechanism 5 is released by the second electromagnetic release device 47A to force the main contact. It can be opened.

After that, when the electromagnetic attraction force is not generated in the fixed iron core 60 due to the interruption of the electric path, the first trip plate 41 is rotated and returned to the original position by the urging of the torsion spring 81. Further, the handle 6 is rotated in the opening direction (clockwise) by the bias of the torsion spring 36.

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
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. 14, 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.

[0099]

According to the first aspect of the present invention, there is provided a body for accommodating a main circuit having two-pole main contacts, a handle at least a part of which is rotatably exposed from the body, and at least an operation of the handle. In response to an opening / closing mechanism that opens / closes the main contact of the main circuit, and if an abnormally large current flows to one of the main contacts of the main circuit due to a ground fault or short-circuit accident, the opening / closing mechanism is released to force the main contact. A first electromagnetic release device for opening a contact; and a second electromagnetic release device for releasing the switching mechanism to forcibly open the main contact when the abnormal large current flows to the other main contact of the main circuit. A leakage current detecting means for detecting a leakage current, and a third electromagnetic releasing device for releasing the switching mechanism to forcibly open the main contact when the leakage current is detected by the leakage current detecting means, The first and second electromagnetic release devices use a fixed iron for the current-carrying conductor of each pole forming the main circuit. Each comprises by armature pivotally toward or away from the movable iron core is to release the closing mechanism when it is attracted to the fixed iron core fixed core in a manner sandwiched between the third
Since the electromagnetic release device of the first electromagnetic release device comprises a coil wound around a fixed iron core provided in the first electromagnetic release device, the fixed iron core and the movable iron core forming the first electromagnetic release device are protected by a third electromagnetic wave for leakage protection. By using it as a release device, it is possible to reduce the number of parts compared to the conventional one, and save space and downsize while protecting each pole from an abnormally large current due to a ground fault or short circuit. There is an effect that can be achieved.

According to a second aspect of the present invention, in the first aspect of the present invention, the opening / closing mechanism restricts movements of the latch member for latching the main contact in the closed state and the latch member for shifting the main contact to the open state. And a tripping member whose regulation is released by the first to third electromagnetic release devices, and the movable iron core of the second electromagnetic release device is attached to the tripping member. There is no need for a member for transmitting the movement of the movement to the tripping member, the number of parts can be further reduced, and the distance between the movable iron core and the tripping member can be shortened to further reduce the size.

According to a third aspect of the present invention, in the second aspect of the invention, the first electromagnetic release device is disposed on the fixed iron core side of the second electromagnetic release device in the body, and the movable core moves in the second electromagnetic release direction. Since the movable iron core in the release device is housed so as to be substantially orthogonal to the moving direction, and the leakage current detecting means is arranged at a position in the body facing the fixed iron cores of the first and second electromagnetic release devices, the first and second The movable iron core and the trip member of the electromagnetic release device of 2 can have a sufficient working space, and the space inside the body can be effectively used to further reduce the size.

[Brief description of drawings]

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

FIG. 2 is a side view showing the above-mentioned throwing state, with the second side case removed.

FIG. 3 is a side view showing the above-mentioned throwing state, with the first side case removed.

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

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

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

FIG. 7 is a perspective view of the first 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 the open state of the above, with the second side case removed.

FIG. 13 is a side view showing the open state of the above, with the first side case removed.

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

FIG. 15 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.

[Explanation of symbols]

1 body 2A, 2B fixed contact 3A, 3B movable contact 5 open / close mechanism 6 handles 47B First Electromagnetic Release Device 47A Second electromagnetic release device 48 Third Electromagnetic Release Device 57 fixed iron core 58 movable iron core 60 fixed iron core 61 Movable iron core 68 coils

Continued front page    (72) Inventor Takehiko Okada             1048, Kadoma, Kadoma-shi, Osaka Matsushita Electric Works Co., Ltd.             Inside the company (72) Inventor Tomoyuki Sawada             1048, Kadoma, Kadoma-shi, Osaka Matsushita Electric Works Co., Ltd.             Inside the company (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 Yasuo Ichimura             1048, Kadoma, Kadoma-shi, Osaka Matsushita Electric Works Co., Ltd.             Inside the company F-term (reference) 5G030 BA02 XX06 XX08 YY02

Claims (3)

[Claims] 1. A body for accommodating a main circuit having a two-pole main contact, a handle at least a part of which is rotatably exposed from the body, and a main contact for the main circuit at least in response to operation of the handle. Opening and closing mechanism for opening and closing, and the first electromagnetic that releases the opening and closing mechanism and forcibly opens the main contact when an abnormally large current flows to one of the main contacts of the main circuit due to a ground fault or short circuit accident. A release device, a second electromagnetic release device that releases the switching mechanism and forcibly opens the main contact when the abnormally large current flows to the other main contact of the main circuit, and a leak that detects a leak current. The first and second electromagnetic devices are provided with a current detecting means and a third electromagnetic releasing device for releasing the switching mechanism to forcibly open the main contact when the leakage current is detected by the leakage current detecting means. The release device is fixed by sandwiching the current-carrying conductor of each pole forming the main circuit with the fixed iron core. The third electromagnetic release device includes movable iron cores that swingably contact and separate from the constant iron core, and releases the opening / closing mechanism when the movable iron core is attracted to the fixed iron core.
An earth leakage circuit breaker, characterized in that a coil is wound around a fixed iron core provided in the first electromagnetic release device. 2. The opening / closing mechanism restricts movements of a latch member for latching the main contact in a closed state and a latch member for shifting the main contact to an open state, and by the first to third electromagnetic release devices. 2. The earth leakage breaker according to claim 1, further comprising a trip member for releasing the restriction, wherein a movable iron core included in a second electromagnetic release device is attached to the trip member. 3. The moving direction of the movable core is substantially orthogonal to the moving direction of the movable iron core of the first electromagnetic releasing device on the fixed iron core side of the second electromagnetic releasing device in the body. 3. The earth leakage breaker according to claim 2, wherein the leakage current detecting means is disposed at a position inside the body which is housed as described above and faces the fixed iron cores of the first and second electromagnetic release devices.