JP2002329451A - Earth leakage breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain miniaturization of an instrument body, and also to make a work penetrating electric path of a main circuit through a zero-phase current transformer easy. SOLUTION: A fixed iron core 57 and a movable iron core 58 are arranged at a bottom of a 1st side case 1A in a lower part of a space between separation wall 65 and 91 prepared in the instrument body 1, and the zero-phase current transformer ZCT is arranged at the upper part of the fixed iron core 57 in the height direction of the instrument body 1. For this reason, the size of the longer direction of the instrument body 1 can be miniaturized. Moreover, since the direction of the axis of the zero-phase current transformer ZCT is made in coincidence with the longer direction of the instrument body 1, the work which makes the electric path of the main circuit penetrate through the zero- phase current transformer easily.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art A conventional earth leakage breaker is disclosed in Japanese Patent Laid-Open No. 6-52.
780 is disclosed. This earth leakage circuit breaker had a plunger that forcibly opens the main contact by driving the movable contact away from the fixed contact when a large overcurrent such as a short-circuit current instantaneously flows in the main circuit. An electromagnetic release device is disposed in the body so as to extend in the longitudinal direction of the body, and the substrate on which the zero-phase current transformer is mounted is separated from the electromagnetic release device by a longitudinal direction. It is arranged in the body so as to match the height direction of the body.

Another conventional earth leakage breaker is disclosed in Japanese Patent Application Laid-Open No. H11-16478. This earth leakage breaker has an electromagnetic release device that attracts the movable core to the fixed core and forcibly opens the main contacts when a large overcurrent such as a short-circuit current flows instantaneously in the main circuit. A substrate to which the zero-phase current transformer is attached is disposed along the bottom surface of the body below the electromagnetic release device, while being disposed inside the body so as to extend in the vertical direction.

[0004]

In the former prior art, the electromagnetic release device and the zero-phase current transformer are disposed at different positions in the longitudinal direction of the body, and the moving direction of the plunger of the electromagnetic release device is changed. Since the length coincides with the longitudinal direction of the vessel, there is a problem that the dimension in the longitudinal direction of the vessel becomes large. In the latter conventional example, a bimetal extending in the height direction of the body is provided between the movable core and the fixed core, and a zero-phase current transformer is provided below the electromagnetic release device. Therefore, there is a problem that the dimension in the height direction of the body, which is the direction in which the bimetal extends, becomes large, and it is difficult to penetrate the core of the zero-phase current transformer with the current carrying path.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to reduce the size of a body and facilitate the operation of passing a zero-phase current transformer through an electric circuit of a main circuit. It is an object of the present invention to provide an earth leakage circuit breaker that can be used.

[0006]

According to a first aspect of the present invention, in order to attain the above object, a main circuit is housed, and input and output terminals for connecting an external electric circuit to the main circuit are arranged in a longitudinal direction. A body provided at both ends, a handle at least part of which is rotatably exposed from the body, an opening / closing mechanism for opening / closing a main contact of a main circuit at least in response to operation of the handle, and an overcurrent such as a short-circuit current. Detects leakage current using an electromagnetic release device that releases the switching mechanism and forcibly opens the main contact when current flows in the main circuit, and a zero-phase current transformer that passes through the main circuit circuit Leakage current detection means, and leakage detection means for releasing a switching mechanism when a leakage current is detected by the leakage current detection means and forcibly opening a main contact, the electromagnetic release device includes a main circuit. The fixed iron core sandwiches the current-carrying conductor to be formed between it and the fixed iron core. It comprises a movable core which can swing and move freely, and the fixed core and the movable core are arranged at the bottom of the body along the height direction orthogonal to the longitudinal direction of the body, and the fixed core and the movable core are In the upper part in the height direction, a zero-phase current transformer is arranged so that the axial direction substantially coincides with the longitudinal direction of the body, and the current-carrying conductor sandwiched between the fixed iron core and the movable iron core is arranged in the direction of extension. Since it is possible to dispose the body in the body along the longitudinal direction of the body, the size of the body in the height direction can be reduced. Further, since the zero-phase current transformer is provided above the fixed core and the movable core in the height direction, the longitudinal dimension of the body can be reduced. Further, the current-carrying conductor can be passed through the zero-phase current transformer as it is along the longitudinal direction of the body where the input side and the output side terminal portions face each other, and the zero-phase current transformer penetrates the electric circuit of the main circuit. Work can be done easily.

According to a second aspect of the present invention, in the first aspect of the present invention, the movable iron core of the fixed iron core and the movable iron core is disposed on the bottom side of the body, and the zero-phase change in the suction operation of the movable iron core. The opening characteristics of the main contact can be stabilized without the influence of the flow device.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the electromagnetic release device and the zero-phase current transformer in the housing are arranged side by side on one side along the longitudinal direction of the housing and are mainly provided. It has a bimetal inserted into the circuit, and when an overcurrent such as an overload current flows in the main circuit, the switching mechanism is released by the electromagnetic release device and the displacement of the bimetal away from the zero-phase current transformer. A thermal release device for forcibly opening the main contact is provided. The distance between the bimetal, the electromagnetic release device, and the zero-phase current transformer can be reduced, and the size of the device can be reduced.

According to a fourth aspect of the present invention, in the third aspect of the invention, a bimetal is inserted into each of a voltage pole and a neutral pole of the main circuit, and the two bimetals are orthogonal to each other in a longitudinal direction in a state of being separated by a partition wall. A zero-phase current transformer is arranged side by side in the width direction of the body, and a zero-phase current transformer is arranged across the partition wall. Easier to penetrate.

According to a fifth aspect of the present invention, in the fourth aspect of the present invention, the fixed core and the movable iron core are arranged in the body so as to sandwich either one of the voltage pole and the neutral pole and to straddle the partition wall. The size of the fixed iron core and the movable iron core can be made sufficiently large, the electromagnetic attraction force can be increased, and the time required for opening the main contact can be shortened.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG.
This will be described in detail with reference to FIGS.

In the present embodiment, the first side case 1A and the second side case 1B made of synthetic resin on both sides are connected in the width direction of the body 1 in the body 1 formed by connecting the first side case 1A and the second side case 1B. Two fixed contacts 2A and 2B, two movable contacts 4A and 4B to which fixed contacts 2A and 2B are fixedly movable and opposed to movable contacts 3A and 3B, and two movable contacts 4A and 4B.
An opening / closing mechanism 5 for driving the movable contacts 4A and 4B.
3B is configured to be brought into contact with (separated from or separated from) each of the fixed contacts 2A and 2B, and each of the fixed contacts 2A and 2B and each of the movable contacts 4A and 4B are vertically moved in the height direction of the body 1. And two movable contacts 4A and 4B in the height direction.
One movable contact 4B interposed between the two fixed contacts 2A and 2B and a fixed contact 2A to which the movable contact 3A of the other movable contact 4A comes and goes are separated from the fixed contacts 2A and 2B by the movable contacts 3A and 3B. In a state where 3B is opened, it is arranged at a height position where it does not intersect when viewed from the width direction of the body 1.

An intermediate case 7 made of a synthetic resin material is fixed in one end of the body 1 in the longitudinal direction so as to be sandwiched between the two cases 1A and 1B.
A terminal block 10A constituting an output terminal on the voltage pole side having a fixed contact 2A provided at one end in a section defined by the concave portion 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, in which a lower fixed contact 2B is provided at one end in a section defined by a recess 9 provided on the second side case 1B side of the intermediate case 7 and a side wall (outer wall) of the second side case 1B. The terminal block 10B constituting the pole-side output terminal is housed.

The terminal block 10A has a terminal plate 11 bent in a U-shape, and an extension piece 11a integrally extended above one end of a lower piece of the terminal plate 11, and extends from an upper end of the extension piece 11a to the extension piece 11a. The fixed contact 12A is bent at a right angle to extend integrally with the terminal plate 11 outwardly, the fixed contact 2A fixed to the upper surface of one end of the fixed contact 12A, and mounted on the lower piece of the terminal plate 11. Terminal board 11
The lock spring 13A has a substantially M-shaped locking spring housed therein. 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 to form the rising wall 8a. Fixed contact 12A beyond upper end
Is drawn out of the recessed portion 8 and is fixed between the rising wall 8a and the partition wall 14 rising from the bottom of the first side case 1A in the same manner as the bottom of the recessed portion 8 on the fixed contact disposing portion 15 integrally formed. By arranging the tip of the fixed contact 12A, the terminal block 10A is arranged in the recess 8. The fixed contact disposing portion 15 is formed with a concave portion 15a for releasing the lower end of the fixed contact 2A protruding from the lower surface of the fixed contact 12A. The terminal plate 11 is turned upward from the other end of the upper piece.
b is integrally extended, and one end of a side protruding portion at 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. . A holding piece 13 of a locking spring 13A is provided on the side face of the side piece of the terminal plate 11.
A projection 23 inserted into the lock spring b to prevent rattling of the lock spring 13A is integrally formed.

The locking spring 13A and the terminal plate 11 constitute a quick connection terminal as a conductor connecting portion. When the intermediate case 7 is overlaid on the first side case 1A, the other end of the first side case 1A is provided. 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 obliquely downwardly directed wire insertion hole 16A formed by a similarly formed obliquely downwardly directed groove 160 in a wall formed on the opposite wall surface of the intermediate case 7 is connected to a terminal. It is press-fitted between the upper piece of the plate 11 and the upper end of the locking piece 13a of the locking spring 13A and the upper end of the holding piece 13b, and the tip of the locking piece 13a locks the core wire in the direction in which the electric wire is drawn out; By pressing the core wire against the upper piece of the terminal plate 11 at the upper end surface of the holding piece 13b, the core wire is electrically connected and mechanically held. A release handle 17 is used to release the wire lock. The release handle 17 is provided with a pivot shaft 18 provided on the lower side surface and a shaft hole 20 provided in the convex flat portion 22 on the inner side surface of the first side case 1A.
A shaft (not shown) rotatably supported at the bottom of the intermediate case 7 and protruding from the wall surface of the vertical wall portion 35 of the intermediate case 7 is rotatably supported by a concave portion 37 provided on the other lower side surface. By manually operating and rotating the operation portion 17a exposed to the outside of the body 1, the drive projection 19 provided at the lower end pushes the tip of one side end of the lock piece 13a of the lock spring 13A to lock the lock. The piece 13a is bent so that the lock with respect to the core wire can be released. In the figure, reference numeral 21 denotes a return spring which constantly biases the release handle 17 in the anti-manual operation direction.

On the other hand, the terminal block 10B has a terminal plate 11 and a locking spring 13B basically similar to the terminal block 10A.
And a fixed contact 12B, but unlike the terminal plate 11 of the terminal block 10A, the terminal block 10
B terminal plate 11 extends downward from one end of the lower piece.
1c is extended, and the body 1 is extended from the tip of the extension piece 11c.
The fixed contact 12B is extended so as to be parallel to the bottom of the terminal plate 11, and a back piece 11d is formed to extend at right angles from one end of the side piece of the terminal plate 11.

The lock spring 13B has the same structure as the lock spring 13A, and is mounted on a lower piece of the terminal plate 11,
The protrusion 23 protruding from the side piece of the terminal plate 11 is
3b.

The terminal block 10B constitutes the bottom of the concave portion 9 of the intermediate case 7, and places the lower piece of the terminal plate 11 on a horizontal wall 24 extending substantially parallel to the bottom of the container 1. The extension piece is formed by fitting the back piece 11d along the vertical wall 25 at one end of the recess 9 and fitting one end of the terminal plate 11 into a notch 27 formed between the lower end of the vertical wall 25 and one end of the horizontal wall 24. When the intermediate case 7 is overlaid on the first side case 1A side, the front end of the fixed contactor 12B, that is, the lower surface provided with the fixed contact 2B is placed on the first side case. 1A is mounted on the bottom ribs 26, 26. That is, the fixed contact 2B is a space formed between the side wall portion 24 of the intermediate case 7, the bulging portion 30 described later, and the side walls of the both cases 1A and 1B.
It is arranged so as to straddle between A and 1B. The recess between the ribs 26, 26 serves as a relief for the lower end of the fixed contact 2B fixed to the tip of the fixed contact 12B and protruding from the lower surface side of the fixed contact 12B.

The upper end of the T-shaped piece 11b, which is formed to extend upward from the other end of the upper piece of the terminal plate 11, has the tip of a laterally protruding portion at the upper end thereof. Is placed on the upper end surface of the.

The locking spring 13B of the terminal block 10B and the terminal plate 11 constitute a quick connection terminal as a conductor connecting portion as in the case of the terminal block 10A, and when the intermediate case 7 is overlaid on the second side case 1B. An obliquely downward groove 1 having a semicircular cross section and provided in a vertical wall at the other end of the recess 9 of the intermediate case 7.
60 and the diagonally 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 an obliquely downward groove 160 provided in a vertical wall at the other end of B, the core wire is locked and locked by a locking piece 13a of a locking spring 13B. The core wire is pressed against the upper piece of the terminal board 11 by the piece 13b to electrically connect the wires and mechanically lock the wires.

This wire lock is released by a release handle 17 ′. The release handle 17 ′ is provided with a rotating shaft 18 provided on the lower side surface, similarly to the release handle 17, and a convex flat portion 22 of the intermediate case 7. The shaft 38 rotatably supported by the shaft hole 20 provided on the inner case 1 and protruding from the inner wall surface of the second side case 1B is rotatably supported by a recess 37 formed on the side surface. When the operating portion 17a exposed on 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 side end of the locking piece 13a of the locking spring 13B to lock the locking piece. 13a can be bent to release the locked state. In the figure, reference numeral 21 'denotes a return spring which constantly biases the release handle 17' in the anti-manual operation direction.

The intermediate case 7 has a bulging portion 30 protruding toward the second side case 1B with respect to a vertical wall portion 35 substantially parallel to the side walls of the two side cases 1A and 1B and in contact with the inner surface of the side wall of the second side case 1B. The wall formed and suspended from the lower surface of the bulging portion 30 is the vertical wall 25, which is surrounded by the side wall, the bottom wall, the vertical wall 32 at one end, and the ceiling wall 33 facing the second side case 1B side. The recessed portion is provided on the first side case 1A side. Then, when the intermediate case 7 is abutted against the first side case 1A, the terminal block 10A assembled on the first side case 1A side.
Of the fixed contact 12A is placed on the step surface of the bottom wall of the recess, and the ceiling wall 33 is arranged along the lower surface of the horizontal wall 29 projecting from the inner surface of the first side case 1A. You. The vertical wall 32 has an opening (not shown) for inserting the free end of the movable contact 4A corresponding to the fixed contact 2A into the recess.

On the other hand, inside the other end of the body 1 in the longitudinal direction, there are three conductive bars (not shown) arranged at different positions (vertical direction in FIG. 1) in the distribution board. One common terminal T for plugging in the conductive bar of the lowermost neutral pole
1 and one selection terminal T2 for selecting and inserting and connecting one of the remaining two voltage electrode conductive bars to at least two conductive electrodes corresponding to the two voltage electrode conductive bars. Inner storage unit 200 movably disposed between two positions
Is provided.

Each of the common terminal T1 and the selection terminal T2 has a substantially U-shape, and is constituted by a blade receiving spring which is expanded toward its tip after the tips of both vertically parallel pieces approach each other. The insertion of the bar is facilitated, and the conductive bar is sandwiched between adjacent central portions.

The inner housing portion 200 has an inner housing portion 200 of the first side case 1A as positioning means for positioning the selection terminal T2 at two positions respectively corresponding to the two conductive bars of the voltage pole. A projection 97 having a substantially semicircular cross section is provided on the end wall surface of the section to be formed in the width direction of the first side case 1A.

On a wall corresponding to the ceiling of the inner storage portion 200 of the container 1, as a display means for displaying which of the two conductive bars of the voltage pole the selection terminal T2 is located at. Through hole 201 communicating with inner storage section 200
And a cylindrical display portion 202 formed on the upper portion of the slide member 83 containing the selection terminal T2 through the through hole 201.
Is visible from the outside facing the through hole 201,
The position of the selection terminal T2 can be known depending on whether it is located at a position distant from 1 and cannot be visually recognized from the outside. Further, the slide member 83 can be pushed downward from the outside through the through hole 201 to be moved downward. The through-hole 201 is a circular hole formed by abutting semi-circular cutouts 201a provided on the upper side walls of both side cases 1A and 1B.

The slide member 83 is made of a synthetic resin molded article and is formed in a frame shape with both end surfaces corresponding to both end directions of the container body 1 opened, and a blade receiving spring constituting the selection terminal T2 is opened from one end. It is inserted and held so that the tip end of the blade receiving spring protrudes from the opening at the other end.
Are arranged so as to be movable in the vertical direction.

Up and down directions in which slide protrusions 203 formed on both sides of a slide member 83 are vertically movably engaged and slid on the inner surfaces of the side walls of both side cases 1A and 1B constituting both side walls of the inner storage portion 200. 2 guide grooves 204
The inner storage portion 200 is formed together with the slide member 83 in a state where the slide protrusions 203 on both sides of the slide member 83 are engaged with the guide grooves 204 on both side walls. T2 is stored and held so as to be slidable vertically. Note that 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.

As shown in FIG. 2, the slide member 83 extends downward from the side of the first side case 1A in the figure.
An extension 3a is integrally formed, and a projection 206 projecting outward is formed at a lower end of the leg 83a.

The projecting portion 206 is a slide groove formed on the outer side of the side wall of the first side case 1A constituting the side wall of the inner storage portion 200, as shown in FIG. An insertion hole 208 opened to communicate with the inner storage portion 200 at the bottom of the upper end of the
7 and slide groove 207 together with leg piece 83a.
Is slidable up and down in the interior.

The slide groove 207 and the insertion hole 208 constitute a guide part for vertically moving the slide member 83 on which the selection terminal T2 is mounted, and the bottom of the slide groove 207 projects into the inner storage part 200. The rear surface of the leg piece 83a inserted upward into the slide groove 207 through the insertion hole 208 formed at the bottom of the upper end of the slide groove 207 can slide on the bottom of the slide groove 207. . The projecting portion 20 is located at the uppermost part of the slide groove 207.
6 is provided with a protruding portion 207a that abuts when it moves to the upper end of the slide groove 207.

Thus, the projecting portion 206 is
An operation unit for vertically moving the selection terminal T2 in the inside is constructed, and if the protrusion 206 is pushed up or down by a driver or the like from outside of the container body 1 and is slid in the slide groove 207, this slide is performed. With the movement, 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 protrusion 97 by its elasticity and the round surface of the positioning protrusion 97. The lower end or upper end of the portion 83 is in contact with the portion 83 to hold the position of the selection terminal T2.

The opening / closing mechanism 5 for driving the movable contacts 4A and 4B to open and close includes an operating plate 43 serving as a latch member, a crossbar 40, and a step-like locking portion 4 for locking one end of the operating plate 43.
1e and a second tripping plate 42
, A handle 6, a U-shaped link 44, and the like. Then, the main contacts (fixed contacts 2A, 2B and movable contacts 3A, 3
In the closed state of B), if a large current such as a short-circuit current flows instantaneously, by the first electromagnetic release device 47, and if a leakage current flows in the main circuit, by the second electromagnetic release device 48,
Further, when an overcurrent such as an overload current flows, the opening / closing mechanism 5 is released and the main contact is forcibly opened by thermal release action.

The handle 6 comprises an operating portion 6a, a rotating portion 6b, and a handle shaft 6c. A handle shaft 6c projecting from the center of both sides of the rotating portion 6b is formed on the inner surface of the first side case 1A. The shaft hole 49 thus formed and the shaft hole 49 formed on the inner surface of the second side case 1B are rotatably inserted into the shaft hole 49 and held between the two cases 1A and 1B. , 1B composed of the connected state of 1B
And a window hole 50 that opens on the upper surface of the device. A torsion spring (not shown) is attached to the handle shaft 6c, and the torsion spring urges the handle 6 in the opening operation direction at the closing operation position (see FIG. 1).

The upper shaft 44a of the U-shaped link 44 is rotatably inserted into the shaft hole 52 provided at the lower end of the rotating portion 6b.
It is connected to the operation 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 the 3a, the lower shaft 44b is connected to the handle 6 via the U-shaped link 44, and is disposed in the body 1 so as to be vertically movable.

The crossbar 40 is formed by inserting shafts 40a projecting from both upper side surfaces into shaft holes 52, 52 formed in the inner side surfaces of both side cases 1A, 1B and pivotally supported between the two side cases 1A, 1B. Then, as shown in FIG. 9, a cut groove 54 for laterally fitting the side of the movable contact 4A is formed on the side of the first side case 1A slightly below the shaft 40a, and the lower second side case 1B The side portions are provided with cut grooves 55 for fitting the movable contact 4B from the lateral direction. A stop piece 130 protruding from the inner surface of the side wall of the intermediate case 7 and the first side case 1A is attached to the movable contact side end surface of each of the movable contacts 3A and 3B.
Are formed in the width direction so as to be engaged with the fixed contacts 2A and 2B in a state of being separated from each other and to contact the bottom thereof (see FIG. 10).

The movable contact 4A is made of a rigid conductive metal plate, is inserted into the cut groove 54 of the cross bar 40 from the side, and has a concave portion (not shown) provided behind the cut groove 54. , The rear part is urged upward by a contact pressure coil spring 53 that is compressed and arranged between the lower surface of the rear part and the bottom part of the concave part.
When the movable contact 4A rotates about the center 0a, the movable contact 4A rotates about the opening edge of the cut groove 54, and the movable contact 3A caulked and fixed to the free end is separated and brought into contact with the corresponding fixed contact 2A. It has become.

The movable contact 4B is made of a conductive spring thin plate. When the crossbar 40 rotates in the closing operation direction, it is pushed downward and bends, and from this bent state, the crossbar 40 moves in the opening operation direction. When it rotates, it returns, and the movable contact 3B crimped and fixed to the tip by its bending and return
Is brought into contact with and separated from the fixed contact 2B.

The lower end of the crossbar 40 is
The first side case 1 </ b> A is pressed by a coil spring 62 that is compressed and arranged between a wall 63 suspended from the bottom of the first side case 1 </ b> A to apply a rotational force.

The first tripping plate 41 has a shaft portion 41a, a protruding portion 41b projecting above the shaft portion 41a, and a shaft portion 41a.
And a pair of leg portions 41c and 41d protruding from the lower part of the case 1A. Both ends of the shaft portion 41a are inserted into shaft holes 56 and 56 provided on the inner side surfaces of the case 1A and 1B.
It is rotatably supported between A and 1B. A locking portion 41e to which one end of the operation plate 43 is engaged and disengaged is formed at an upper end portion of the protruding portion 41b, and a receiving portion (not shown) pushed and driven by a bimetal 45 to be described later is formed on a tip side surface of one leg portion 41c. ), And a receiving portion 41f which is pushed and driven by the second tripping plate 42 is provided on the side surface of the tip of the other leg portion 41d.

The second tripping plate 42 is formed in a substantially rectangular shape in which an opposing portion 42a and a receiving portion 42c protrude from a central portion having a shaft hole 42b, and a shaft 31f provided on a partition wall member 31 described later is connected to the shaft hole 42b. And is pivotably supported by the robot. A drive piece 42d is provided on an end face of the facing portion 42a so as to face a lower end of a bimetal 46 described later and to be pressed when the bimetal 46 is bent.

Conductive plates 71A, 71B made of thick metal material
, Bimetals 45 and 46 constituting a thermal release device are welded, fixed, and hung. The other end of the braided wire 79A having one end welded to the selection terminal T2 is welded to a fixed portion of the one bimetal 45 with the conductive plate 71A, and a lead having one end connected to a first circuit board 73 described later. The wire 82A is welded, and the other end of the braided wire 79B, one end of which is welded to the common terminal T1, is welded to a fixed portion of the other bimetal 46 with the conductive plate 71B, and the current is connected to the movable contact 4B. The other end of the braided wire 79C, one end of which is welded to a conductor 80 (described later), is welded to the approximate center of the bimetal 46, and the selection terminal T2, the conductive plate 71A, the bimetal 45, the braided wire 79A, and the movable contact 4A are formed. While being electrically connected, the common terminal T1, the braided wire 79
B, the conductive plate 71B, the bimetal 46, the braided wire 79C, the conducting conductor 80, and the movable contact 4B are electrically connected. The bimetals 45 and 46 are provided with adjusting screws 77 and 7 respectively.
The lower end position can be adjusted by screwing 7 ', but since this adjusting mechanism is not the gist of the present invention, a detailed description thereof will be omitted.

The conductive plates 71A and 71B and the bimetals 45 and 46 are held by the partition wall member 31. This partition member 31 is made of an insulating synthetic resin molded product and is a flat partition 31a separating the two bimetals 45 and 46, and from the periphery of the partition 31a to both sides in the thickness direction (width direction of the container 1). Each of the recesses 31c, 31 surrounded by the partition wall 31a and the peripheral wall 31b.
The conductive plate 71A, the bimetal 45 and the conductive plate 71B
And the bimetal 46 are respectively stored. Recess 31c,
A plurality of protrusions 31d are protruded from the peripheral wall 31b on the upper side of the protrusion 31c so as to face each other.
The conductive plates 71A, 71B and the bimetals 45, 46 are held by the partition wall member 31 by press-fitting the A, 71B. Further, the recess 31 accommodating the conductive plates 71A and 71B.
Adjustment screws 77, 7 are provided on upper peripheral wall 31b of c, 31c.
Rectangular notches 31e, 31e are formed to expose 7 'to the outside of the recesses 31c, 31c. Further, the recess 31c on the side where the conductive plate 71B and the bimetal 46 are stored.
The shaft 3 to be inserted into the shaft hole 42b of the second tripping plate 42 is provided at the bottom.
1f protrudes.

As shown in FIG. 5, the first electromagnetic release device 47 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 magnetic iron plate.
And a leaf spring 59 serving as an elastic member that elastically biases the movable iron core 58 away from the fixed iron core 57 while supporting the movable iron core 58 in a swingable manner on both end magnetic pole surfaces of the fixed iron core 57. The current-carrying conductor 80 has a braided wire 79 at the end.
An inner piece 80a to which one end of C is welded, and an outer piece 80b extending substantially in the shape of an L from the rear end of the inner piece 80a and facing the inner piece 80a substantially parallel to each other. Is connected to the rear end of the movable contact 4B.

The movable iron core 58 has projections 58a, 58a protruding from the surface on the fixed iron core 57 side, and a central piece 59 of a leaf spring 59.
By being inserted and fixed in the holes 59b, 59b formed at one end of "a", it is swingably supported by the leaf spring 59.
On the other hand, the leaf spring 59 is formed by bending both side pieces 59c, 59c formed on both sides of the central piece 59a by the side pieces 5 of the fixed iron core 57.
7a, 57a are arranged along the outer surfaces of the
Locking pieces 59 projecting inward from the tips of 9c and 59c
The inner piece 80a of the current-carrying conductor 80 is interposed between the fixed core 57 and the movable core 58 as shown in FIG. 6 by locking the d and 59d with the concave portions 57b and 57b formed at the outer corners of the fixed core 57. The movable iron core 58 is sandwiched 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 surface which is the tip of both side pieces 57a, 57a of the fixed iron core 57 has the center piece 59a of the leaf spring 59 and the both side pieces 59a.
The movable core 58 is opposed to the movable core 58 via the gaps c and 59c.

When an overcurrent such as a short-circuit current flows through the current-carrying conductor 80, the two pieces 57a, 57
The movable iron core 58 is formed by electromagnetic attraction generated on the magnetic pole surface
Is caused to oscillate by suction. Since the fixed iron core 57 and the movable iron core 58 are connected by the leaf spring 59 to form a block, the first electromagnetic release device 47 is used as described later.
Is easy to assemble into the container 1.

Here, the direction of the electromagnetic attraction generated on the magnetic pole surfaces of both side pieces 57a, 57a of fixed iron core 57 by the current flowing through inner piece 80a of current-carrying conductor 80, and the current flowing through outer piece 80b, both sides of fixed iron core 57 The direction of the electromagnetic attraction force generated on the magnetic pole surfaces of the pieces 57a, 57a is made the same, and the electromagnetic attraction force for attracting the movable iron core 58 is increased to open the main contact quickly. Further, since the current-carrying conductor 80 is not used also as the bimetals 45 and 46 of the thermal release device, the distance between the fixed iron core 57 and the movable iron core 58 can be reduced as compared with the conventional example where the current-carrying conductor 80 also serves as the bimetal. The size of the fixed iron core 57 and the movable iron core 58 in the facing direction can be reduced.

On the other hand, the second electromagnetic release device 48 is connected to the fixed iron core 57 of the first electromagnetic release device 47 by an exciting coil 68.
Is wound around. That is, as shown in FIG. 5, the coil bobbin 69 formed in a rectangular tube shape with one side opened by an insulating material such as a synthetic resin is formed so that the side pieces 57a and 57a of the fixed iron core 57 project from both ends in the axial direction. And outer flanges 69a, 69a provided at both axial ends of the coil bobbin 69 as shown in FIG.
A coil 68 is wound therebetween. The coil bobbin 6
Near the open side surfaces of the outer flanges 69a, 69a, there are provided substantially cubic support portions 69b, 69b, and pins 69c, 6 protruding from the side surfaces of the support portions 69b, 69b.
The terminal of the coil 68 is tied to 9c.

When a leakage current such as a ground fault current flows, the coil 68 is energized by the leakage protection circuit 51 to be described later to excite the fixed iron core 57, and the both ends 57 a of the fixed iron core 57 are fixed. An electromagnetic attraction force is generated on the magnetic pole surface to cause the movable iron core 58 to swing and swing. That is, the fixed iron core 57, the movable iron core 58, and the leaf spring 5 constituting the first electromagnetic release device 47 by winding the coil 68 around the fixed iron core 57.
9 can also be used as the second electromagnetic release device 48, so that the first electromagnetic release device for short-circuit protection and the second electromagnetic release device for short-circuit protection are conventionally configured as independent components. In comparison, the number of parts can be reduced, and space and size can be reduced.

The coil 68 and the current-carrying conductor 80 (the inner piece 80a) between the fixed iron core 57 and the movable iron core 58
Since the energizing directions of the coils coincide with each other, when the coil 68 is energized and the second electromagnetic release device 48 operates, the electromagnetic attraction generated on the magnetic pole surfaces of the both side pieces 57a and 57a of the fixed iron core 57 can be increased. The main contact can be quickly opened. Further, since the coil 68 is wound around the fixed iron core 57, the coil 68 does not move, so that disconnection of the coil 68 can be prevented. However, the coil 6 is
8 may be wound.

The leakage protection circuit 51 has the circuit configuration shown in FIG.
9A) and a zero-phase current transformer ZCT in which a neutral-pole electric circuit (braided wire 79B) is inserted. When a current flowing through each pole of the main circuit becomes unbalanced due to a leakage current such as a ground fault current, a zero-phase current is generated. A current (detection current) flows between the output terminals of the current transformer ZCT according to the degree of unbalance. This detected current is an alternating current, which is clamped by a clamp circuit including diodes D1 and D2 connected in anti-parallel, and converts the detected current into a voltage by charging the smoothing capacitor C1 via the resistor R1.
Then, the voltage between both ends of the smoothing capacitor C1, that is, the detection voltage converted from the detection current is supplied to the leakage current determination circuit 51a.
Is input to

The power of the leakage current determination circuit 51a is supplied to the diode D through the coil 68 of the second electromagnetic release device 48.
3. A series circuit of the resistors R2 to R5 and the smoothing capacitor C2 is connected between the voltage pole and the neutral pole of the main circuit, and the voltage across the smoothing capacitor C2 is applied to the power supply terminal and the ground terminal of the leakage current determination circuit 51a. Obtained by: A coil 68 and a thyristor SC are provided between the voltage pole and the neutral pole of the main circuit.
A series circuit of R and a diode D3 is connected, 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 to apply the control signal.
Turn on. Note that a filter circuit including a capacitor C0 and a resistor R0 is connected between both ends of the thyristor SCR.

The leakage current judging circuit 51a compares the detected voltage with a predetermined threshold, and according to the comparison result, determines whether the capacitor C
3 is charged or discharged, and a comparison signal is delayed by outputting a control signal from an output terminal according to the voltage between both ends of the capacitor C3. Therefore, when a leakage current flows in the main circuit, the thyristor SC
When R is turned on and the coil 68 is energized, the second 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 externally includes the capacitor C3 and a resistor R6 for determining a time constant for discharging the capacitor C3 after the leakage is detected.

Further, between the voltage pole and the neutral pole of the main circuit,
A test circuit 70 composed of a series circuit of a resistor RT, a normally open test switch SW, and a lead 70a inserted through the zero-phase current transformer ZCT is connected. That is, the test switch S
When W is turned on and a current flows through the lead 70a, an unbalanced current flows through the primary side of the zero-phase current transformer ZCT to create a pseudo leakage state, and whether the leakage protection circuit 51 operates normally or not. Can be tested. The surge absorbing element SA is connected in parallel to the resistor RT and the test switch SW.

By the way, the above-mentioned plural kinds of circuit components constituting the leakage protection circuit 51 and the test circuit 70 are mounted on first and second circuit boards 73 and 74 composed of a printed wiring board as shown in FIG. . The first circuit board 73 includes high-power circuit components (resistors R2, R3,
The diode D3, the test circuit 70, the filter circuit, and the like are mounted, and the second circuit board 74 includes low-current circuit components (leakage current determination circuit 51a, a clamp circuit, , A smoothing capacitor C1, a zero-phase current transformer ZCT, etc.) and a thyristor SCR. The test switch SW has one end connected to the first circuit board 73.
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. The fixed contact 76b 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 pushed by the test button 78
b to be turned on in contact with the b.

The zero-phase current transformer ZCT has a ring-shaped core (not shown) in which windings (not shown) are wound as shown in FIG.
And a pair of output terminals 75a protruding from the side end of the housing 75 facing in the axial direction of the core (the direction of the arrow shown in FIG. 8, the same applies hereinafter). Are inserted into through holes 74a, 74a provided in the upper part of the second circuit board 74, and the output terminal 75a is connected to the wiring pattern on the rear surface (shown in the figure) with the housing 75 almost in close contact with the surface of the second circuit board 74. Z)
Is mounted by soldering.

The housing 75 of the zero-phase current transformer ZCT
As shown in FIG. 8, the first and second circuit boards 73,
74, a plurality of contact pins for attaching the
67₁~ 67_FiveAre protruded from both sides in the axial direction.
These contact pins 67 ₁~ 67_FiveIs made of metal
The axial direction is made to coincide with the axial direction of the zero-phase current transformer ZCT, and
With both ends protruding from the side surface of the housing 75,
The first circuit board 73
Contact pins 67₁~ 67_FiveTo
The boss 75c covering the end of the housing 75
It is formed integrally.

On the other hand, the first and second circuit boards 73 and 74
Are formed with through holes 73a and 74b through which the contact pins 67 _{1 to} 67 ₅ are inserted, respectively. The contact pins 67 inserted through the through holes 73a and 74b are respectively formed.
By joining the ends of _{1-67 5} to the wiring pattern,
The first and second circuit boards 73 and 74 include a zero-phase current transformer ZCT.
Are attached to both sides in the thickness direction (axial direction). At this time, the contact pins 67 _{1 to} 67 ₄ also serve as a current path between the two circuit boards 73 and 74, and the first and second circuit boards 73 and ₇ are provided via the contact pins 67 _{1 to} 67 _5.
The circuit components mounted on 4 are electrically connected. Also,
Yes and the contact pin 67 ₅ is provided in the vicinity of the through-hole 75b which opens in the center of the housing 75, the contact pin 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 73b and 74c that communicate with the through holes 75b of the housing 75 and through which the braided wires 79A and 79B are inserted. Also, the first circuit board 7
Reference numeral 3 denotes one end of a lead wire 82A connected to the voltage pole of the main circuit via the conductive plate 71A, and the other end of a lead wire 82B one end of which is welded to a connection member 99 for connection to the neutral pole of the main circuit. And are connected.

A plurality of types of circuit components constituting the leakage protection circuit 51 are mounted on the first and second circuit boards 73 and 74, and the first and second circuit components are provided on both sides in the thickness direction of the zero-phase current transformer ZCT. 2
Circuit boards 73 and 74 are arranged and housed in the housing 1, so that each circuit board is compared with a conventional case where the leakage protection circuit 51 and the zero-phase current transformer ZCT are mounted on one circuit board. The longitudinal dimensions of 73 and 74 can be reduced, and the body 1 can be reduced in size. Further, contact pins 67 _{1 to} 67 ₅ serving as mounting portions on the housing 75 of the zero-phase current transformer ZCT.
, The first and second circuit boards 73, 7
4, the zero-phase current transformer ZCT can be easily attached. Further, the mounting portions are made of metal contact pins 67 ₁ to 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.

[0062] In addition, test the contact pin 67 ₅ circuit 7
The lead 70a of the test circuit 70 can be easily inserted into the core of the zero-phase current transformer ZCT by attaching the first and second circuit boards 73 and 74 to the zero-phase current transformer ZCT. Can be done. Further, the first circuit board 73 mounts high-power circuit components forming a high-power circuit, and the second circuit board 74 mounts low-power circuit components mainly forming a low-power circuit. Therefore, more circuit components can be mounted on the second circuit board 74 mainly mounted with circuit components of a weak electric system capable of shortening an insulation distance as compared with a strong electric system. Here, since the lead wire 82A for connecting to the voltage pole of the main circuit and the lead wire 82B for connecting to the neutral pole are connected to the first circuit board 73 on which the high-power circuit components are mounted, The second circuit board 74 has the advantage that circuit components can be arranged without considering the insulation distance from the connection position of the lead wires 82A, 82B.

When 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
At the home position together with the return spring 21. Also, the handle 6 is assembled at a predetermined position together with the torsion spring. Then, the cross bar 40 is fitted into the groove 54 with the movable contact 4A fitted therein, and the coil spring 53 is housed in the recess.
It is rotatably arranged together with the coil spring 62 at a predetermined position of the side case 1A. Further, the operation plate 43 is disposed so as to be connected to the handle 6 by a link 44.

Further, the common terminal T1 is stored in the storage portion 90 provided at the bottom of the other end of the container 1, and the selection terminal T2 is brought into contact with the slide member 83 together with the second side case 1B. Is stored in a compartment inside the first side case 1A corresponding to the inner storage portion 200. Further, a slide groove 207 for forming the leg piece 83a of the slide member 83 through the insertion hole 208 on the outer side surface of the side wall of the first side case 1A.
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,
At the upper part of the space between the separation wall 65 formed in the height direction opposite to the separation wall 91 at substantially the center in the longitudinal direction of the side case 1A,
The first and second circuit boards 73 and 74 attached to the zero-phase current transformer ZCT are housed with the second circuit board 74 having a long dimension in the longitudinal direction as the partition wall 91 side, and the first and second circuit boards are located below the space. The second electromagnetic release devices 47 and 48 are housed. Here, two ribs 92 are provided along the width direction of the container body 1 at a position near the partition wall 91 at the bottom of the first side case 1A.
A second fitting groove 92a formed between the two ribs 92
Of the circuit board 74, 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 coincides with the longitudinal direction of the first side case 1A. The second circuit board 74 is positioned and fixed so as to substantially coincide with.

Further, rectangular window holes 98 are respectively opened on the side walls of the two-sided cases 1A and 1B facing the zero-phase current transformer ZCT, and a portion where the width dimension of the housing 75 is the largest is a window hole as shown in FIG. 98 to allow the housing 75 to escape. That is, the housing 7 of the zero-phase current transformer ZCT
5 is slightly larger than the widths of the first and second circuit boards 73 and 74, and if the width of the housing 1 is adjusted to the width of the housing 75, a useless space is generated. By providing the window hole 98 and letting the housing 75 escape as described above, it is possible to prevent the useless space from being generated and to reduce the width of the body 1. 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 protrude from the outer side wall of the case 1A, 1B.

On the other hand, the first and second electromagnetic release devices 47,
Reference numeral 48 denotes a first side case 1A at the lower part of the space with the movable iron core 58 down in the height direction of the body 1 as shown in FIG.
A fixed iron core 5 arranged at the bottom and in the height direction of the body 1
7, a zero-phase current transformer ZCT is arranged. The fixed core 57 and the movable core 5 thus connected by the leaf spring 59
8 is disposed at the bottom of the body 1 along the height direction of the body 1, and at the upper part of the fixed iron core 57 and the movable iron core 58, the axial direction substantially coincides with the longitudinal direction of the body 1, and the zero-phase current flow Vessel ZCT
Is disposed, the current-carrying conductor 80 sandwiched between the fixed iron core 57 and the movable iron core 58 can be disposed in the body 1 with its extending direction coinciding with the longitudinal direction of the body 1.
Can be reduced in height. Further, by arranging the zero-phase current transformer ZCT above the fixed core 57 and the movable core 58 in the height direction, the longitudinal dimension of the housing 1 can be reduced. Further, since the axial direction of the zero-phase current transformer ZCT is made coincident with the longitudinal direction of the body 1, it is easy to penetrate the electric circuit (braided wires 79A, 79B) of the main circuit through the zero-phase current transformer ZCT. I can do it. Alternatively, when the braided wires 79A and 79B are inserted into the first side case 1A in a state where the braided wires 79A and 79B are penetrated through the zero-phase current transformer ZCT in advance, the distance in which the braided wires 79A and 79B are routed in the body 1 may be short. Moreover, since the movable iron core 58 is arranged on the bottom side of the body 1, the suction operation of the movable iron core 58 is not affected by the zero-phase current transformer ZCT, and the opening characteristics of the main contact described later are stabilized. Can be.

Here, the movable contact 4B, the rear end of which is connected to the front end of the outer piece 80b, has its central obliquely upwardly inclined portion located slightly above the bottom of the first side case 1A. It is disposed 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 the direction of the other end of the first side case 1A and further inclined upward from the parallel portion and the bottom of the first side case 1A. The free end side of the movable contact 4B is
Is arranged in the space where the fixed contact 12B is arranged via the notch 14a. At this time, the movable contact 4B is fixed by sandwiching the rear end of the movable contact 4B with a plurality of ribs 96 projecting from the lower surface of the parallel portion of the partition 95 and the bottom of the first side case 1A. At this time, a connection member 99 connected to the first circuit board 73 by the lead wire 82B is sandwiched and fixed between the bottom of the first side case 1A and the movable contact 4B to thereby secure the leakage protection circuit 51 and the test circuit 70. Is connected to the neutral pole circuit.

Further, in the space between the separation wall 65 and the partition wall 95, the conductive plates 71A and 71B and the bimetals 45 and 46 are provided.
Is stored. At this time, the partition wall member 31 is positioned within the space of the container body 1 by placing the inclined portion of the lower peripheral wall 31b of the partition wall member 31 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 disposed on the side closer to the fifth and fourth metal substrates 46, 46, the second circuit board 74 and the bimetal 45,
46 mounted on the second circuit board 74 at a distance from
It is possible to suppress the influence of the heat generated by the bimetals 45 and 46 on circuit components of a weak electric system weak to heat, such as C (leakage current determination circuit 51a).

Further, the first tripping plate 41 is rotatably disposed at a fixed position together with the torsion spring, and the second tripping plate 42 is rotatably disposed at a fixed position. At this time, the receiving portion 42 c of the second tripping plate 42 faces the tip of the movable iron core 58.

In this way, as shown in FIG. 10, 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 its return spring 21', the first side case 1A side After that, 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 disposed so as to overlap the first side case 1A.

Here, when the intermediate case 7 is disposed at a fixed position on the first side case 1A side, the free end side of the movable contact 4A is disposed in the recess through the opening of the vertical wall, and the terminal block 10A Is mounted on the stepped surface of the bottom wall, and the shaft fits into the concave portion 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. The lower surface of the downward step formed at the end of the intermediate case 7 is placed on a flat surface formed on the end wall of the first side case 1A.

In this state, the second side case 1B is overlapped with the first side case 1A side and joined. At this time, the claw-shaped hooking locking portions 101 at the tips of the four upper and lower elastic locking pieces 100 integrally projecting from the first side case 1A to the second side case 1B correspond to the second side case 1B side. The first side case 1 is locked by the projection
A and the second side case 1B are connected and fixed to form the body 1 (see FIG. 3, FIG. 4, FIG. 9, etc.). This first
When the coupling and fixing of the side case 1A and the second side case 1B are released, a driver is inserted into the second side case 1B from each of the release holes 150 opened corresponding to each of the hooked portions 102, and the corresponding elastic members are inserted. The second side case 1B can be removed from the first side case 1A by pressing the hook locking portion 101 of the stop piece 100 upward to release the hooking state with the hooked portion 102.

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

The heads of the adjusting screws 77 and 77 ′ corresponding to the bimetals 45 and 46 face the opening 104 opened on the upper surface of the body 1 through the notch 31 e of the partition member 31. The operation adjusting screw 7 is provided through the opening 104 so that an optimum operating point can be obtained at the time of the operation test.
7, 77 ′ are screwed forward to adjust the distance between the tip of the bimetal 45 and the leg 41c of the crossbar 40, and the distance between the tip of the bimetal 46 and the driving piece 42d of the second tripping plate 42,
After the adjustment, the lid 106 is fitted to the periphery of the opening 104 of the container 1 by using the elasticity to cover the opening 104.

As shown in FIG. 4, 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, so that the size of the body 1 in the width direction is small. It is trying to make it. Further, since the displacement directions are set to be away from the second circuit board 74 and the two electromagnetic release devices 47 and 48 along the longitudinal direction of the body 1, the bimetals 45 and 46 and the electromagnetic release devices 47 and 48 are set. In addition, the distance from the zero-phase current transformer ZCT (the second circuit board 74) is reduced, so that the size of the body 1 in the longitudinal direction can be reduced.

Further, since the bimetals 45 and 46 are isolated by the partition 31a of the partition member 31, the partition 31a can insulate the bimetals 45 and 46 and narrow the gap 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 each of the bimetals 45 and 46 is provided.
9A and 79B are easily penetrated through the zero-phase current transformer ZCT. 2 further including a fixed iron core 57 and a movable iron core 58;
The two electromagnetic release devices 47 and 48 are also provided in the width direction of
1a, the width of the fixed iron core 57 and the movable iron core 58 can be made sufficiently large, the electromagnetic attraction force can be increased, and the time required for opening the main contact can be shortened. it can.

The inner storage portion 20 inside the other end of the container 1
The selection terminal T2 and the common terminal T1 are stored in the housing 0 and the storage portion 90, respectively, and one end of the housing 1 extends across the end surface and both side surfaces of the housing 1 so as to correspond to these terminals T1 and T2. The insertion parts 209a to 209c which are opened to the outside are formed. Further, a pair of wire insertion holes 16A and 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, so that each of the terminal blocks 10A and 1B is inserted.
0B, and the conductive bar of the neutral electrode is plugged into the common terminal T1 in the width direction via the insertion portion 209c, and the conductive bar of the voltage electrode is connected to the selection terminal T via the insertion portion 209a or 209b.
2, the earth leakage breaker of the present embodiment can be inserted into the electric circuit.

As shown in FIG. 2, a protruding base 105 is provided near the opening 104 of the second side case 1B, through which an insertion hole 105a through which the test button 78 is inserted is formed. Insert the test button 78 from above into the insertion hole 10
5a and the locking step 78a is inserted 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 falling off by being locked to the periphery of the 5a, and is attached to the protruding base 105. The tip of the test button 78 is connected to the 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 at the distal end thereof, and the fixed contact 76 is pressed.
b, and the test switch SW can be turned on. The lid 106 has a semicircular notch 1 through which the test button 78 is inserted to avoid interference with the test button 78.
06a is provided.

Here, as shown in FIG. 9, a window hole 98 from which the housing 75 of the zero-phase current transformer ZCT is partially exposed is opened on both side surfaces of the housing 1, so that the housing In order to prevent foreign substances from entering the inside of the housing 1 and improve the appearance, a rectangular tube-shaped insulating sheet 107 made of an insulating sheet-shaped material is attached to the body 1 to open a window hole. 9
8 is covered.

Next, the operation of this embodiment will be described with reference to FIGS.
This will be described with reference to FIG. FIG. 10 shows an open state. In this open state, the operating portion 6a of the handle 6 is in a state of being inverted and exposed from the window hole 50, and the engagement state between one end of the operation plate 43 and the first tripping plate 41 is set. It is in a detached state.
The crossbar 40 is urged by the coil spring 62 to rotate clockwise in the figure, and the movable contact 4A inserted through the cut groove 54 of the crossbar 40 moves the free end upward. The movable contact 4B, which has been inserted through the cut groove 55, has its free end moved upward by its spring elastic force, and the movable contacts 3A, 3B provided at the respective free ends have the movable contacts 3A, 3B. Corresponding fixed contacts 2A, 2B
In a state of being separated from.

When the operating portion 6a of the handle 6 is rotated clockwise in this state, the upper shaft 44a of the link 44 is pushed downward, and the link 44 pushes down the operating plate 43 by the lower shaft 44b. When the operating plate 43 is pressed down, one end (right end in the figure) of the operating plate 43 hits the locking portion 41e of the first tripping plate 41, and the operating plate 43 rotates counterclockwise around the position as a rotation center, The other end (left end) of the operation plate 43 hits a protrusion 84 provided at the upper end of the crossbar 40, and rotates the crossbar 40 counterclockwise against the bias of the spring.

By this rotation, the cutting groove 55 of the crossbar 40 is
The movable contact 4B inserted into the movable contact 4B is bent in a direction to move the free end downward, and the movable contact 3B at the free end is brought into contact with the fixed contact 2B. Further, the movable contact 4A inserted through the cut groove 54 rotates counterclockwise to bring the movable contact 3A at its free end into contact with the fixed contact 3B. This contact is delayed more than the movable contact 3B contacts the fixed contact 2B.

When the handle 6 is further rotated clockwise, the upper shaft 44a moves leftward as shown in FIG. 1 from the line connecting the position of the lower shaft 44b of the link 44 and the center of rotation of the handle 6. In this state, the torsion spring of the handle 6, the coil spring 62 for urging the cross bar 44, the spring force of the movable contact 4B, and the like are balanced so that one end of the operation plate 43 and the first trip plate 41 are locked. The latch state with 41e is maintained, and the closed state of FIG. 1 is maintained.

When the operating portion 6a of the handle 6 is rotated counterclockwise in the inserted state, the upper shaft 44a of the link 44
Is moved rightward beyond the line connecting the center of rotation of the handle 6 and the lower shaft 44b to the upper side, so that the left end of the operation plate 43 and the locking portion 41e of the first tripping plate 41 are latched. Is released, and the crossbar 40 is rotated clockwise by the urging force of the coil spring 62, and the handle 6 is rapidly rotated back to the off side by the urging force of the torsion spring. Crossbar 4
By rotating clockwise 0, the movable contact 4A rotates clockwise to move the free end upward, thereby separating the movable contact 3A from the fixed contact 2A. Further, the movable contact 4B is not pushed down, and returns to the original state by the spring force, so that the movable contact 3B at the free end is fixed to the fixed contact 2B.
More apart. This separation is later than the separation of the movable contact 3A from the fixed contact 2A. This delay is the same also at the time of forced opening described later.

Since the opening and closing of the main contacts of both poles is delayed as described above, the arc generated at the time of opening and closing the contacts is only the movable contact 4A on the rigid body side, and the movable contact made of a spring material is used. 3B can be prevented from being consumed by the arc.

Further, stop pieces 130 formed in the two cases 1A, 1B and the intermediate case 7 are formed in the concave grooves 131 formed in the width direction of the distal end face of the cross bar 40 which rotates when the main contact is opened.
Is engaged and abuts against the bottom of the concave groove 131, so that there is no danger that the arc generated in one section wraps around from the crossbar 40 side on the back side of the body 1 and enters another section. 1 Prevent short circuit between poles due to an arc inside.

When an overcurrent flows through the load in the above-described closed state shown in FIG. 1, the bimetals 45 and 46 generate heat due to the overcurrent and bend and displace. Here, the bimetals 45 and 46 hanging from above are displaced such that the lower ends move leftward in the figure, and the lower ends of the bimetals 46 move the driving piece 42d of the second tripping plate 42 leftward as shown in FIG. Push the lower end of the bimetal 45 into the first release plate 4
Push the receiving portion (not shown) at the tip of one leg 41c to the left. The displacement of the bimetal 46 causes the second tripping plate 4
2 rotates counterclockwise, and the facing portion 4 of the second tripping plate 42
2a pushes the receiving portion 41f of the first tripping plate 41 to the left. The first tripping plate 41 has a receiving portion of bimetal 4
5 and the receiving portion 41f is
, It rotates clockwise.

When the first release plate 41 rotates clockwise, the latching state between the locking portion 41e and one end (right end) of the operation plate 43 is released, and the operation plate 43 is moved to the lower shaft 44b of the link 44. Will be rotated clockwise about. Therefore, the crossbar 40 by the other end (left end) of the operation plate 43
The crossbar 40 is rotated clockwise by the spring force of the coil spring 62 to return the movable contacts 4A and 4B to the open state as shown in FIG.
A and 3B are separated from the fixed contacts 2A and 2B, respectively. That is, when an overload current flows in the main circuit,
The opening / closing mechanism 5 is released by the thermal release device, and the main contact is forcibly opened to protect the load.

Then, the bimetal 45,
46 returns to the original state, the first tripping plate 41 is pivotally returned to the original position by the bias of the torsion spring, and at the same time, the receiving portion 41f pushes and moves the opposing portion 42a of the second tripping plate 42 to the second position. 2 Return the tripping plate 42 to its original position. The handle 6 is rotated in the opening direction (counterclockwise) by the bias of the torsion spring.

In the above-mentioned closed state, when an excessive current such as a short-circuit current flows through the current-carrying conductor 80, the fixed core 57
Then, an electromagnetic attraction force is generated to attract and swing the movable iron core 58. As a result, as shown in FIG. 12, the distal end of the movable iron core 58 pushes the receiving portion 42c of the second tripping plate 42, and the second
The trip plate 42 is rotated counterclockwise. When the second tripping plate 42 rotates counterclockwise in the same manner as when the overload current flows, the facing portion 42a of the second tripping plate 42 moves the receiving portion 41f of the first tripping plate 41 to the left. Press and rotate clockwise. When the first release plate 41 rotates clockwise, the latch state between the locking portion 41e and one end (right end) of the operation plate 43 is released, and the operation plate 43 is centered on the lower shaft 44b of the link 44. Will rotate clockwise. Therefore, the crossbar 40 by the other end (left end) of the operation plate 43
The crossbar 40 is rotated clockwise by the spring force of the coil spring 62, and the movable contacts 4A, 4B
Is returned to the open state, and the movable contacts 3A and 3B are separated from the fixed contacts 2A and 2B, respectively. That is, when an overcurrent (an instantaneous large current) such as a short-circuit current flows in the main circuit, the opening and closing mechanism 5 is released by the first electromagnetic release device 47 to forcibly open the main contact. it can.

Thereafter, when no electromagnetic attraction force is generated in the fixed iron core 57 due to the interruption of the electric circuit, the movable iron core 58 is
9, the first tripping plate 41 returns to the original position by the bias of the torsion spring, and at the same time, the receiving portion 41f pushes the facing portion 42a of the second tripping plate 42. Move to return the second tripping plate 42 to its original position. Also handle 6
Is rotated in the opening direction (counterclockwise) by the bias of the torsion spring.

Further, in the above-mentioned closed state, when a leakage current such as a ground fault current flows, the leakage protection circuit 51 energizes the coil 68 to generate an electromagnetic attraction in the fixed iron core 57 to attract the movable iron core 58. And rock it. As a result, similarly to the case where a short-circuit current flows, as shown in FIG.
The tip of the movable core 58 is the receiving portion 42 of the second tripping plate 42.
c to rotate the second tripping plate 42 counterclockwise and the first tripping plate 41 clockwise to return the movable contacts 4A and 4B to the open state,
A and 3B are separated from the fixed contacts 2A and 2B, respectively. That is, when a leakage current such as a ground fault current flows in the main circuit, the opening and closing mechanism 5 is released by the second electromagnetic release device 48 and the main contact is forcibly opened to protect the ground fault. .

[0096]

According to a first aspect of the present invention, there is provided a container body which houses a main circuit and has input and output terminals at both ends in a longitudinal direction for connecting an external electric circuit to the main circuit. Handle that is rotatably exposed from the body, an opening and closing mechanism that opens and closes the main contact of the main circuit at least according to the operation of the handle, and an opening and closing mechanism when an overcurrent such as a short-circuit current flows in the main circuit. An electromagnetic release device for releasing the main contact forcibly to open, a leakage current detecting means for detecting a leakage current using a zero-phase current transformer penetrating the electric circuit of the main circuit, and a leakage current detecting means. Leakage release means for releasing the switching mechanism when a leakage current is detected and forcibly opening the main contact, and the electromagnetic release device sandwiches the current-carrying conductor forming the main circuit between the fixed iron core Do not equip the fixed iron core with a movable core The fixed core and the movable core are arranged at the bottom of the body along the height direction orthogonal to the longitudinal direction of the body, and the axial direction is set at the upper part of the height direction of the fixed core and the movable core in the longitudinal direction of the body. Since the zero-phase current transformer is arranged substantially in conformity with the above, the current-carrying conductor sandwiched between the fixed iron core and the movable iron core can be disposed in the housing with its extending direction coinciding with the longitudinal direction of the housing. Therefore, the dimension in the height direction of the body can be reduced, and the zero-phase current transformer is arranged above the fixed core and the movable core in the height direction. The dimensions can be reduced, and
The current-carrying conductor can be passed through the zero-phase current transformer as it is along the longitudinal direction of the body where the input and output terminals face each other. There is an effect that it can be easily performed.

According to a second aspect of the present invention, in the first aspect of the present invention, the movable iron core of the fixed iron core and the movable iron core is disposed on the bottom side of the body, so that the suction operation of the movable iron core is performed by the zero-phase current transformer. There is an effect that the influence is not exerted and the opening characteristics of the main contact can be stabilized.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the electromagnetic release device and the zero-phase current transformer are provided side by side with the electromagnetic release device and the zero-phase current transformer in the housing along the longitudinal direction of the housing and are mainly provided. It has a bimetal inserted into the circuit, and when an overcurrent such as an overload current flows in the main circuit, the switching mechanism is released by the electromagnetic release device and the displacement of the bimetal away from the zero-phase current transformer. Equipped with a thermal release device that forcibly opens the main contact, so that the distance between the bimetal and the electromagnetic release device and the zero-phase current transformer can be reduced, and the size of the device can be reduced. .

According to a fourth aspect of the present invention, in the third aspect, a bimetal is inserted into each of the voltage pole and the neutral pole of the main circuit, and the two bimetals are orthogonal to each other in a longitudinal direction in a state of being separated by a partition wall. Since the zero-phase current transformers are arranged side by side in the width direction of the vessel and straddle this partition, insulation between the two bimetals can be achieved by the partition and the current-carrying conductor of each pole passes through the zero-phase current transformer. This has the effect of making it easier.

According to a fifth aspect of the present invention, in the fourth aspect of the present invention, the fixed core and the movable iron core are arranged in the body so as to sandwich either one of the voltage electrode and the neutral electrode and enclose the partition wall. Therefore, the dimensions of the fixed iron core and the movable iron core can be made sufficiently large, and there is an effect that the time required for opening the main contact can be shortened by increasing the electromagnetic attraction force.

[Brief description of the drawings]

FIG. 1 is a side view showing a state in which a second side case is removed according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the same.

FIG. 3 is a rear sectional view of the same.

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

FIG. 5 is an exploded perspective view of the first and second electromagnetic release devices in the same.

FIG. 6 is a perspective view of the first and second electromagnetic release devices in the same.

FIG. 7 is a circuit diagram of a leakage protection circuit and a test circuit in the above.

FIG. 8 is an exploded perspective view of the structural parts of the zero-phase current transformer and the first and second circuit boards in the same.

FIG. 9 is a perspective view of the same.

FIG. 10 is a side view showing the open state of the above, with the second side case removed.

FIG. 11 is an explanatory diagram of a state of an overcurrent trip operation due to the overload current in the above.

FIG. 12 is an explanatory diagram showing a state of an overcurrent tripping operation due to a short-circuit current and an earth leakage tripping operation due to a ground fault current.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Container 5 Opening / closing mechanism 47 1st electromagnetic release device 48 2nd electromagnetic release device 51 Earth leakage protection circuit ZCT Zero-phase current transformer 57 Fixed iron core 58 Movable iron core

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takeshi Tanaka 1048 Kadoma Kadoma, Kadoma-shi, Osaka Matsushita Electric Works Co., Ltd. F term (reference) 5G030 BA01 BA06 EA01 FA01 FB16 FC11 XX02 XX12 YY12

Claims (5)

[Claims] 1. A container housing a main circuit and having input and output terminals at both ends in a longitudinal direction for connecting an external electric circuit to the main circuit, and at least a part of the container being rotatable from the container. Handle that is exposed to the main body, an opening and closing mechanism that opens and closes the main contact of the main circuit at least according to the operation of the handle, and releases the opening and closing mechanism when an overcurrent such as a short-circuit current flows into the main circuit to force the main contact When the leakage current is detected by the electromagnetic release device that opens the pole, the leakage current detection means that detects the leakage current using the zero-phase current transformer that penetrates the electric circuit of the main circuit, and the leakage current detection means Earth leakage trip means for releasing the opening / closing mechanism and forcibly opening the main contact.
It has a movable core that swingably contacts and separates the fixed core so that the current-carrying conductor forming the main circuit is sandwiched between the fixed core and the fixed core. The zero-phase current transformer is arranged at the top of the fixed core and the movable core in the height direction of the fixed core and the movable core, with the axial direction substantially aligned with the longitudinal direction of the main body. And earth leakage breaker. 2. The earth leakage breaker according to claim 1, wherein a movable core among the fixed core and the movable core is arranged on a bottom side of the body. And a bimetal inserted in the main circuit and arranged on one side along the longitudinal direction of the main body with respect to the electromagnetic release device and the zero-phase current transformer in the main body. When such an overcurrent flows in the main circuit, an electromagnetic release device and a thermal release device that releases the switching mechanism by the displacement of the bimetal away from the zero-phase current transformer and forcibly opens the main contact. The earth leakage breaker according to claim 1, wherein the earth leakage breaker is provided. 4. A bimetal is inserted into each of a voltage pole and a neutral pole of a main circuit, and two bimetals are juxtaposed in a width direction of a vessel orthogonal to a longitudinal direction in a state of being separated by a partition. The earth leakage breaker according to claim 3, wherein a zero-phase current transformer is arranged across the power supply. 5. The earth leakage according to claim 4, wherein a fixed core and a movable core are arranged in the body so as to sandwich either one of the voltage pole and the neutral pole, and straddle the partition. Circuit breaker.