JP2003162953A - Ground-fault interrupter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ground-fault interrupter whose body can be miniaturized. <P>SOLUTION: There are provided a handle 6, a multiple-pole contacts 2A, 2B, 3A, and 3B, a zero-phase current transformer ZCT, and a leakage test button 78. There is also provided circuit boards 73 and 74 to which, implementing a leakage detection circuit 51 which supplies a tripper coil 68 with an excitation current, a leakage test movable plate 76a driven by operation of the leakage test button 78 and a leakage test fixed contact 76b which allows a pseudo unbalance current to flow to the zero-phase current transformer ZCT when the leakage test movable plate 76a contacts/comes off, are attached/ detached, and they are so disposed that both end faces face the upper and lower surfaces of a body 1. The leakage test movable plate 76a is disposed on the end face side of the circuit board 70 positioned on the upper surface side of the body, with the fixed contact 76b formed on the end face. <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 an earth leakage circuit breaker for energizing a coil to forcibly open a contact of each pole when an unbalanced current between the poles is detected.

[0002]

2. Description of the Related Art As a conventional example, there is one disclosed in JP-A-8-293679. This is the thickness of the zero-phase current transformer (1
The circuit board attached with one side facing the surface (thickness direction) in the vertical direction is arranged in the height direction inside the body. At the position corresponding to the earth leakage test button to be performed, the earth leakage test movable plate and the earth leakage test fixed contact with which the earth leakage test movable plate comes in contact with and separates from each other are attached to the circuit board.

The positions of the earth leakage test movable plate and the earth leakage test fixed contact are also mounted above the zero phase current transformer on the surface to which the zero phase current transformer is attached.

[0004]

In the above-mentioned earth leakage circuit breaker, the earth leakage test movable plate and the earth leakage test fixed contact are the surfaces to which the zero phase current transformer is attached, and are more Since it is mounted on the upper side of the circuit board, a space for installing the leakage test movable plate and the leakage test fixed contact is required on the mounting surface of the zero-phase current transformer of the circuit board, and the vertical length of the circuit board becomes longer. However, there is a problem that the height of the body becomes large especially in the height direction.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an earth leakage circuit breaker capable of achieving a compact body.

[0006]

An earth leakage circuit breaker according to claim 1 is a handle operable from the upper surface of the body, a plurality of contacts which are opened and closed by the turning operation of the handle, and between each pole. A zero-phase current transformer that detects an unbalanced current, an earth leakage test button arranged on the upper surface of the body, an earth leakage test movable plate driven by operation of this earth leakage test button, and this earth leakage test movable plate are connected. When they are separated, the earth leakage test fixed contact that causes a pseudo unbalanced current to flow into the zero-phase current transformer is attached, and the contacts of each pole are forcibly opened when the unbalanced current is detected by the zero-phase current transformer. In a ground fault circuit breaker, which is provided with a ground fault detection circuit that supplies an exciting current to a trip coil for poles, and a circuit board arranged such that both end surfaces thereof face the upper and lower surfaces of the body, The earth leakage test movable plate on the upper surface side of the body Together disposed on the end face side of the circuit board that location, is characterized in that the earth leakage test fixed contacts formed on the end surface of the circuit substrate located on the upper surface of the device body.

According to the earth leakage breaker of the first aspect, the space in the height direction of the circuit board can be effectively utilized, and the body can be made compact especially in the height direction.

According to a second aspect of the present invention, there is provided the earth leakage breaker according to the first aspect, wherein the end surface of the circuit board is provided with a recess, and the earth leakage test fixed contact is disposed in the recess.

According to the earth leakage circuit breaker of the second aspect, in addition to the same effect as in the first aspect, the earth leakage test movable plate is connected to the circuit in which the earth leakage test fixed contact is directly attached to the end face of the circuit board. Even if it comes close to the end face of the substrate, it can be sufficiently separated from the fixed contact for the leakage test, and thus the interval between the upper and lower surfaces of the body can be narrowed, and the body can be made compact.

According to a third aspect of the present invention, there is provided the earth leakage breaker according to the second aspect, wherein the tip end of the test movable plate is bent toward the fixed contact.

According to the earth leakage circuit breaker of the third aspect, in addition to the same effect as in the second aspect, since the earth leakage test fixed contact is in the recess of the end face of the substrate, the tip of the earth leakage test movable plate is formed as it is. It is possible to easily contact the earth leakage test fixed contact with the earth leakage test fixed contact, and it is easy to ensure contact between the earth leakage test fixed plate and the earth leakage test fixed contact, and the earth leakage test movable plate contacts the end surface of the circuit board. Hard to do.

The earth leakage breaker according to claim 4 is the same as claim 1,
In claim 2 or claim 3, the end surface of the earth leakage test movable plate on the side opposite to the contact end surface of the earth leakage test fixed contact is bent so as to be in contact with the circuit board.

According to the earth leakage circuit breaker of claim 4, in addition to the same effect as that of claim 1, claim 2 or claim 3, the end face of the earth leakage test movable plate is brought into contact with the circuit board, and this point is Since the earth leakage test movable plate contacts the earth leakage test fixed contact as a fulcrum, elasticity of the earth leakage test movable plate can be easily obtained.

[0014]

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 this embodiment, the container 1 is formed side by side in the width direction of the container 1 constituted 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 cases 1A and 1B in one end portion of the body 1 in the longitudinal direction.
A terminal block 10A constituting an output terminal on the voltage pole side, in which a fixed contact 2A is provided at one end in a section 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 (or another 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. 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 terminal 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 wire withdrawing direction. Moreover, the core wire is pressed against the upper piece of the terminal plate 11 by the upper end surface of the pressing piece 13b, whereby the core wire is electrically connected and mechanically held. The release handle 17 is to release this wire lock.
This release handle 17 has a rotating shaft 18 provided on the lower side surface.
Is rotatably supported by a shaft hole 20 provided in a convex flat portion 22 on the inner surface of the first side case 1A, and the vertical wall portion 3 of the intermediate case 7 is supported.
A shaft (not shown) projecting on the wall surface of No. 5 is rotatably supported in a recess 37 provided on the other side surface of the lower portion, and the operating portion 17a exposed to the outside of the body 1 is manually operated. By rotating, 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 bend the locking piece 13a, and the locking to the core wire can be released. It is like this. Reference numeral 21 in the drawing denotes a return spring that constantly biases the release handle 17 in the anti-manual operation direction.

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

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

The terminal block 10B constitutes the bottom of the recess 9 of the intermediate case 7, and the lower piece of the terminal plate 11 is placed on the lateral wall 24 extending substantially parallel to the bottom of the body 1. The inner strip 11d is provided along the vertical wall 25 at one end of the recess 9 and one end of the terminal plate 11 is fitted into a notch 27 formed between the lower end of the vertical wall 25 and one end of the horizontal wall 24 to extend the extension piece. When the intermediate case 7 is superposed on the first side case 1A side, the tip of the fixed contactor 12B, that is, the lower surface on which the fixed contact 2B is provided 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 lock spring 13B and the terminal plate 11 of the terminal block 10B constitute a quick connection terminal which is a conductor connecting portion as in the case of the terminal block 10A, and when the intermediate case 7 is superposed on the second side case 1B. , An oblique downward groove 1 having a semicircular cross section provided on the vertical wall portion at the other end of the recess 9 of the intermediate case 7.
60 and this diagonal downward groove 160 as well as the second side case 1
When an electric wire is inserted through an electric wire insertion hole 16B formed by a diagonal downward groove 160 provided in the vertical wall at the other end of B, the core wire is locked by the locking piece 13a of the locking spring 13B and pressed. The core wire is pressed against the upper piece of the terminal board 11 by the piece 13b to electrically connect the electric wire and mechanically lock it.

A release handle 17 'is used to release the electric wire lock. In the release handle 17', the rotary shaft 18 provided on the lower side surface of the release handle 17 'has a convex flat portion 22 of the intermediate case 7. 'A shaft 38 rotatably supported in a shaft hole 20 provided in the second side case 1B and protruding 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 bulge 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 wall of the both side cases 1A and 1B and abuts against the inner surface of the side wall of the second side case 1B. The wall formed and hanging from the lower surface of the bulging portion 30 is the vertical wall 25, and is surrounded by the side wall facing the second case 1B side, the bottom wall, the vertical wall 32 at one end, and the ceiling wall 33. The recessed portion is provided on the first side case 1A side. The terminal block 10 assembled on the first side case 1A side when the intermediate case 7 is butted against the first side case 1A side
The front end side of the fixed contactor 12A of A 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 lateral wall 29 protruding from the inner side surface of the first side case 1A. To be done. Further, the vertical wall 32 is formed with an opening (not shown) 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. 1) in the distribution board. One common terminal T for inserting and connecting the conductive bar of the voltage electrode at the bottom
1 for accommodating and arranging 1 and the remaining one of the voltage pole and the conductive bar of the neutral pole are selected and plugged in 1
An inner storage portion 200 is provided in which one selection terminal T2 is movably arranged between at least two positions corresponding to the remaining one conductive bar of the voltage pole and the neutral pole.

Common terminal T which is a plug-in type input terminal
1 and the selection terminal T2 are both substantially U-shaped, and are composed of blade receiving springs that are expanded toward the tip after the tips of both side pieces that are parallel in the vertical direction come close to each other, and the conductive bar is inserted by expanding the tip. For simplicity, the conductive bar is sandwiched between the central and adjacent portions.

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

On the wall corresponding to the ceiling of the inner housing portion 200 of the body 1, the selection terminal T2 is located at a position corresponding to one of the remaining one conductive bar of the voltage pole and the neutral pole. As a display means for displaying whether or not there is, a through hole 201 communicating with the inner housing portion 200 is provided, and a cylindrical display portion 202 formed on the slide member 83 housing the selection terminal T2 is provided through the through hole 201. It is possible to know the position of the selection terminal T2 depending on whether it is visible from the outside facing the hole 201 or not visible from the outside because it is located away from the through hole 201. You can check. It is also possible to push the slide member 83 from the outside through the through hole 201 and move it downward. This through hole 201 is a case 1 on both sides.
The circular holes are formed by abutting the semicircular notched holes 201a provided on the upper side walls of A and 1B.

The slide member 83 is made of a synthetic resin molded product and is formed in a frame-like shape with both end surfaces corresponding to both end directions of the body 1 open, and the blade receiving spring constituting the selection terminal T2 is opened from one end. The tip end of the blade receiving spring is inserted into the other end opening and is held so as to project from the other end opening.
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 vertically movably engaged and slid on the inner surfaces of the side walls of the both-side cases 1A and 1B constituting the both side walls of the inner storage portion 200. 2 of the guide groove of
The inner housing portion 200 is formed between the parallel projections 205 of the strip, and the inner housing portion 200 is engaged with the slide projections 203 on both sides of the slide member 83 in the guide grooves 204, 204 on the both side walls, together with the slide member 83 and the selection terminal. T2 is stored and held so as to be slidable in the vertical direction. A slide protrusion may be provided on the inner storage section 200 side and a guide groove may be provided on the slide member 83 side.

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

The protruding portion 206 is a slide groove formed on the outside of the side wall of the first side case 1A constituting the side wall of the inner storage section 200 and extending upward from the bottom surface of the first side case 1A as shown in FIG. The slide groove 2 is inserted from an insertion hole 208 opened at the upper end bottom portion of 207 so as to communicate with the inner storage portion 200.
07 is inserted into the slide groove 20 together with the leg piece 83a.
The inside of 7 is slidable in the vertical direction.

The slide groove 207 and the insertion hole 208 constitute a guide portion for vertically moving the slide member 83 to which the selection terminal T2 is mounted, and the bottom portion of the slide groove 207 projects into the inner storage portion 200. The bottom surface of the leg piece 83a, which is formed in the upper part of the slide groove 207 and is inserted into the slide groove 207 through the insertion hole 208 formed in the bottom of the upper end of the slide groove 207, can be slidably contacted with the bottom portion of the slide groove 207. . Further, the protrusion 20 is provided on the uppermost side of the slide groove 207.
A projecting portion 207a is provided that abuts when 6 moves to the upper end of the slide groove 207.

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

When the slide member 83 is moved by the above-mentioned operation, the upper end or the lower end of the slide member 83 overlies 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 and close includes the operating plate 43 as a latch member, the crossbar 40, and the stepped locking portion 4 for locking one end of the operating plate 43.
1st trip board 41 provided with 1e, and 2nd trip board 42
The handle 6, the U-shaped link 44, and the like. 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 instantaneously flows, by the first electromagnetic release device 47, if a leakage current flows in the main circuit, by the second electromagnetic release device 48,
Further, if an overcurrent such as an overload current flows, the thermal release devices (45, 46) release the switching mechanism 5 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 protruding in the center of both side surfaces of the rotating portion 6b is formed on the inner surface of the first side case 1A. Rotatably inserted into the shaft hole 49 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 (not shown) is attached to the handle shaft 6c, and the handle 6 is biased in the opening operation direction at the closing operation position (see FIG. 2) by the torsion spring.

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 operating plate 43 via a U-shaped link 44.

The operating plate 43 is a bearing hole 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 both-side cases 1A and 1B by inserting shafts 40a projecting from both upper sides into shaft holes 52 and 52 formed on the inner side surfaces of the both-side cases 1A and 1B. As shown in FIG. 12, a groove 54 for laterally fitting the side portion of the movable contactor 4A is formed on the side portion on the first side case 1A side slightly below the shaft 40a, and the lower second side case 1B. Cut grooves 55 into which the movable contact 4B is fitted in the lateral direction are provided on the side portions on the side. The movable contact side end surface is provided with a stopper 130 protruding from the inner surfaces of the side walls of the intermediate case 7 and the first side case 1A.
A concave groove 131 is formed in the width direction so that B is engaged with the fixed contacts 2A and 2B in a separated state and abuts on the bottom thereof (see FIG. 13).

Here, 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 (not shown) provided behind the cut groove 54. In the above, the rear portion is biased upward by the coil spring 53 for contact pressure which is arranged between the lower surface of the rear portion and the bottom portion of the recessed portion so that the crossbar 40 is pushed upward.
When the movable contactor 4A is rotated about 0a, the movable contactor 4A is rotated about the opening edge of the cut groove 54, and the movable contact 3A caulked and fixed to the free end is opened / contacted with the corresponding fixed contact 2A. It is like this.

The movable contactor 4B is made of a conductive spring thin plate material, and when the crossbar 40 rotates in the closing operation direction, it is pushed downward and bends. 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.

The first trip plate 41 has a shaft portion 41a, a protruding portion 41b protruding above the shaft portion 41a, and a shaft portion 41a.
It is composed of a pair of leg portions 41c and 41d projecting to the lower part of the both sides case 1 by inserting both ends of the shaft portion 41a into shaft holes 56, 56 provided on the inner side surfaces of the both sides cases 1A and 1B.
It is rotatably supported between A and 1B. A return spring 301 using a torsion coil spring biases the operating plate 43 in a latching direction. 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 (not shown) that is pushed and driven by a bimetal 45 described later is formed at the tip side surface of one leg portion 41c. ), And a receiving portion 41f that is driven and driven by the second trip plate 42 is provided on the side surface of the tip end of the other leg portion 41d. Furthermore the first
The magnetic plate 340 is fixed so as to face the base end side of the bimetal 45 above the shaft portion 41a of the trip plate 41. For example, a protrusion is provided on the first trip plate 41, a hole is formed in the magnetic plate 340, and the protrusion is fitted and fixed to the protrusion. Where bimetal 4
5, a U-shaped short-circuit detecting yoke 341 is arranged on the side opposite to the magnetic plate 340 with both sides of the yoke close to the magnetic plate 340 from both sides of the bimetal 45. York 3
41 is fixed to the body 1 or the partition member 31. Therefore, when a short-circuit current flows through the bimetal 45, a large magnetic flux generated around the bimetal 45 is generated by the yoke 341 and the magnetic plate 340 before the bimetal 45 is heated and the first trip plate 41 is pushed. The magnetic plate 340 passes through the magnetic circuit and attracts the magnetic plate 340 to the yoke 341.
The trip plate 41 is rotated in the direction of releasing the operating plate 43.

The second tripping 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
In this case, bimetals 45 and 46, which constitute a thermal release device, are welded, fixed, and hung. One end of the braided wire 79A, one end of which is welded to the common terminal T1, is welded to a portion of the one bimetal 45 fixed to the conductive plate 71A, and the other end of which is connected to the first circuit board 73, which will be described later. The wire 82A is welded, and the other end of the braided wire 79B, one end of which is welded to the selection terminal T2, is welded to the 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 having one end welded to the conductor 80 (described later) is welded to the substantially central portion of the bimetal 46, and the common terminal T1, the braided wire 79A, the conductive plate 71A, the bimetal 45, the braided wire 79D, and the movable contact. And the selection terminal T while being electrically connected to the child 4A.
2, 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 lower end positions of the bimetals 45 and 46 can be adjusted by screwing the adjusting screws 77 and 77 ', but this adjusting mechanism is not the gist of the present invention, and therefore detailed description thereof is omitted.

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 face each other on a peripheral wall 31b on the upper side of 31c, and the conductive plate 7 is provided between these protrusions 31d.
The conductive plates 71A and 71B and the bimetals 45 and 46 are held by the partition member 31 by press-fitting 1A and 71B. In addition, the recess 31 that accommodates the conductive plates 71A and 71B
The adjusting screws 77, 7 are provided on the upper peripheral wall 31b of the c, 31c.
Rectangular notches 31e and 31e are formed to expose 7'to the outside of the recesses 31c and 31c. Further, the recess 31c on the side for housing the conductive plate 71B and the bimetal 46
A shaft 31f to be inserted into the shaft hole 42b of the second trip plate 42 is provided at the bottom of the shaft.

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

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 overcurrent such as a short circuit current flows through the current-carrying conductor 80, both side pieces 57a, 5 of the fixed iron core 57 are formed.
The movable iron core 58 is generated by the electromagnetic attraction generated on the magnetic pole surface of 7a.
Is sucked and rocked. Since the fixed iron core 57 and the movable iron core 58 are connected to each other by the leaf spring 59 to form a block, the first electromagnetic release device 47 will be described later.
The work of assembling the above into the body 1 becomes easy.

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. Further, since the current-carrying conductor 80 is not used also as the bimetals 45 and 46 of the thermal release device, the gap between the fixed iron core 57 and the movable iron core 58 can be made narrower than in the conventional example in which the current-carrying conductor 80 is also used as the bimetal. Therefore, 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, in the second electromagnetic release device 48, a coil 68 for excitation is attached to the fixed iron core 57 of the first electromagnetic release device 47.
It is configured by winding. As shown in FIG. 6, a coil frame 69 formed of an insulating material such as a synthetic resin in the shape of a rectangular tube with one side open is formed by projecting the side pieces 57a, 57a of the fixed iron core 57 from both ends in the axial direction. 7, the coil 68 is wound between outer flanges 69a, 69a provided on both axial ends of the coil frame 69 as shown in FIG. Near the open side surfaces of the outer flanges 69a, 69a of the coil frame 69, holding pieces 69b, 69b having a substantially cubic shape are provided.
And a coil 68 is attached to the conductive mounting pins 69c and 69c protruding from the side surfaces of the holding pieces 69b and 69b.
The terminal is ridiculous.

The outer collar 69a of the coil frame 69 also extends in the axial direction, and the housing 7 of the zero-phase current transformer ZCT.
5, projecting outward from the end surface of the circuit board 73 described later,
The coil frame 69 is engaged with the coil frame 69 from the circuit board 73 side toward the zero-phase current transformer side. The outer collar 69a is composed of a narrow width portion and a wide width portion that are inserted into the coil frame holding portion 310, and the amount of insertion into the coil frame holding portion 310 is restricted by the end portion 69d on the narrow width portion side of the wide width portion. In this way, after the coil frame 69 is slid on the coil frame holding part 310 of the zero-phase current transformer ZCT, the coil 68 is attached to the circuit board 73.
If it is connected to the coil frame 69, the zero-phase current transformer ZCT and the circuit board 73, the circuit board 73 and the coil 48 can be connected to the lead wire in the blocked state. Therefore, the work of assembling into the body 1 becomes easy.

The coil frame 69 has a coil 68 on the base end side.
A pair of mounting pins 69c, 69c, which are connected to the respective ends of the coil and whose front ends are connected to the circuit board 73, and slide the coil frame 69 onto the coil frame holding portion 310 of the housing 75 of the zero-phase current transformer ZCT. Each mounting pin 6 when
The circuit board 73 is provided with a pair of mounting holes 311 into which the tip side of 9c is inserted. As a result, if the coil frame 69 is slid onto the coil frame holding portion 310 of the zero-phase current transformer ZCT, the pair of mounting pins 69c will be inserted into the respective mounting holes 311 of the circuit board 73, and the coil 68 and the circuit. Electrical connection with the substrate 73 can be easily made.

These mounting pins 69c are attached to the circuit board 73.
Board mounting piece 312 on the tip side that is inserted into the mounting hole 311 of
And a base end side coil mounting piece 313 connected to the terminal end of the coil 68 by being bent so as to extend away from the board mounting piece 312.
Coil frame 69 protruding from the winding surface around which the coil 68 is wound
The pair of holding pieces 6 having through holes 314, through which the coil attachment pieces 313 of the attachment pins 69c can be inserted, on both sides of
9b is provided. Therefore, the coil 6 is attached to the coil frame 69.
When winding 8, the holding piece 69b does not get in the way, and the coil 68 is easily wound. Further, the pair of holding pieces 69b projecting from the winding surface have the mounting pins 69c which are linear from the base end to the tip end, and the distance between the mounting pins 69c is long, so that the circuit board 73 cannot be downsized. , The circuit board 73 is bent in an L shape so that they come close to each other.
Can be miniaturized.

The mounting pin 69c is such that at least the coil mounting piece 313 and the through hole 314 of the coil frame 69 are formed in a non-circular cross section such as a square hole, and when the coil mounting piece 313 is inserted into the through hole 314, the board mounting piece is mounted. The rotation of the coil 312 about the coil mounting piece 313 is restricted. When the coil mounting piece 313 of the mounting pin 69c is inserted into the through hole 314, it cannot rotate, so the mounting pin 69c is fixed.
It becomes easier to align the tip end of the board with the mounting hole 311 of the circuit board 73, and thus the work of inserting the tip of the board mounting piece 312 of the mounting pin 69c into the mounting hole 311 of the circuit board 73 becomes easier.

Further, the coil mounting piece 313 of the mounting pin 69c
When the through hole 314 is penetrated through, the coil mounting piece 313 is provided with a pair of locking portions 315 and 316 which are locked to both surfaces of the holding piece 69b so as to sandwich the holding piece 69b of the coil frame 69. In this case, the tip of the coil attachment piece 313 is formed in a taper so as to be easily inserted into the through hole 314, and the rear end of the taper is used as the locking portion 315. Therefore, the pair of locking portions 315 and 316 of the mounting pin 69c are attached to the coil frame 69.
If it is locked to the holding piece 69b, it becomes easier to align the tip of the mounting pin 69c with the mounting hole 311 of the circuit board 73, so that the tip of the board mounting piece 312 of the mounting pin 69c is attached to the mounting hole of the circuit board 73. It becomes easy to insert it into 311.

When a leakage current such as a ground fault current flows, a coil 68 is energized by a leakage protection circuit 51, which will be described later, to excite the fixed iron core 57, so that both side pieces 57a, 57a of the fixed iron core 57 are excited. The electromagnetic attraction force is generated on the magnetic pole surface 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 57, the movable iron core 58, and the leaf spring 5 that form the first electromagnetic release device 47.
Since 9 can be used also as the second electromagnetic release device 48, the first electromagnetic release device for short-circuit protection and the second electromagnetic release device for leakage protection are composed of independent parts. In comparison, the number of parts can be reduced, and space saving and miniaturization can be achieved.

Further, the coil 68 and the current-carrying conductor 80 (inner piece 80a) between the fixed iron core 57 and the movable iron core 58.
Since the energization directions of the two coincide with each other, the electromagnetic attraction force generated on the magnetic pole surfaces of the both side pieces 57a, 57a of the fixed iron core 57 when the coil 68 is energized and the second electromagnetic release device 48 operates can be strengthened, 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 earth 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 neutral pole (or other voltage pole) electric circuit (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, the output terminals of the zero-phase current transformer ZCT are unbalanced. 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 of the leakage current judging 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 (or another voltage pole) of the main circuit, and the voltage across the smoothing capacitor C2 is the power source of the leakage current determination circuit 51a. It is obtained by applying to the terminal and the ground terminal. Also, the voltage pole and neutral pole of the main circuit (or other voltage pole)
A series circuit of a coil 68, a thyristor SCR, and a diode D3 is connected between them, and the control signal output from the output terminal of the leakage current determination circuit 51a is applied to the gate of the thyristor SCR to turn on the thyristor SCR. A snubber 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 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 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 RT and a normally open test switch S are provided between the voltage pole and the neutral pole (or another voltage pole) of the main circuit.
A test circuit 70 composed of a series circuit of leads 70a inserted into W and the zero-phase current transformer ZCT 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, as shown in FIG. 1, the plural 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. To be done. On the first circuit board 73, high-voltage circuit components (resistors R2 and R, 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).
3, the diode D3, the test circuit 70, the snubber circuit, etc. are mounted, and the second circuit board 74 includes a weak current system circuit component (leakage current determination circuit 51a, which constitutes a weak current system circuit on the right side of the boundary line W). A clamp circuit, a smoothing capacitor C1, a zero-phase current transformer ZCT, etc.) and a thyristor SCR are mounted. One end of the test switch SW is the first circuit board 73.
A movable contact plate 76a, which is a leakage test movable plate joined to and supported so as to swing freely, and an earth leakage test fixed contact 76b mounted on the first circuit board 73 so as to face the movable contact plate 76a. When the test button 78 movably arranged on the free end side of the movable contact plate 76a is pressed, the movable contact plate 76a pushed by the test button 78 comes into contact with the fixed contact 76b. Then turn on.

In this case, the movable contact plate 76a is disposed on the end face side of the circuit board 73 located on the upper face side of the body, and
The earth leakage test fixed contact 76b is formed on the end surface of the circuit board located on the upper surface side of the body, which allows the space in the height direction of the circuit board 73 to be effectively utilized, and Compactness (in the vertical direction) can be achieved. The movable contact plate 76a is arranged substantially parallel to the end surface of the circuit board 73,
A leg piece 328 parallel to the circuit board 73 is extended from one end side thereof, and its tip is bent and fixed to the circuit board 73. In addition, a recess 326 is provided on the end surface of the circuit board 73, a leakage test fixed contact 76b is disposed in the recess 326, and a leakage test fixed contact is directly attached to the end surface of the circuit board 73, while a leakage test movable contact plate is provided. 76a to the circuit board 7
Fixed contact 76b for leakage test even if it is close to the end face of 3
Since it is possible to reduce the distance between the upper and lower surfaces of the body 1, it is possible to make the body 1 compact. Further, since the tip end 329 of the test movable contact plate 76a is bent toward the fixed contact, and the leakage test fixed contact 76b is in the recess 326 on the end face of the substrate 73,
It is possible to easily contact the earth leakage test movable contact plate 76a with the earth leakage test fixed contact 76b as compared with the one in which the tip of the earth leakage test movable contact plate 76a is formed as it is. Is easy to make sure, and it becomes difficult for the earth leakage test movable contact plate 76a to come into contact with the end surface of the circuit board 73. On the other hand, the end surface of the end portion 360 of the earth leakage test movable contact plate 76a opposite to the tip 329 which is the earth leakage test fixed contact contact end surface is bent so as to abut on the upper edge of the circuit board 73. When the earth leakage test movable contact plate 76a is pressed by the test button 78, the movable contact plate 76a tries to incline the width direction with the leg piece 328 as a fulcrum, but the end face of the end portion 360 abuts on the upper end face of the circuit board 73,
Since the leakage test movable contact plate 76a contacts the leakage test fixed contact 76b with this point as a fulcrum, the elasticity of the leakage test movable contact plate 76a can be easily obtained.

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 housing 75 made of a synthetic resin, and a pair of output terminals 75a projecting from side end portions of the housing 75 facing in the axial direction of the core (the direction of the arrow shown in FIG. 1, the same applies hereinafter). Is inserted into through holes 74a, 74a provided in the upper part of the second circuit board 74, and the output terminal 75a is provided with a wiring pattern (not shown) on the back surface in a state where the housing 75 is substantially adhered to the surface of the second circuit board 74. No)
It is mounted by soldering.

The housing 75 of the zero-phase current transformer ZCT
Includes the first and second circuit boards 73,
Contact pins 67a to 67e, which are a plurality of attachment portions for attaching 74, are provided so as to project from both axial side surfaces. These contact pins 67a to 67e are made of metal, the axial direction of which is aligned with the axial direction of the zero-phase current transformer ZCT, and both ends thereof are projected from the side surfaces of the housing 75, respectively, and insert-molded (or press-fitted) into the housing 75. ) Is
A boss portion 75 that covers the contact pins 67a to 67e on the side surface facing the first circuit board 73 except for the tip end portions thereof.
c and another boss portion 75c 'are integrally formed with the housing 75.

On the other hand, the first and second circuit boards 73, 74
Through holes 73a and 74b for inserting the contact pins 67a to 67e are bored in the contact pin 6, respectively, and the contact pin 6 inserted into the through holes 73a and 74b.
By joining the end portions of 7a to 67e to the wiring pattern, the first and second circuit boards 73 and 74 are connected to the zero-phase current transformer Z.
It is attached to both sides of the CT in the thickness direction (axial direction). At this time, the contact pins 67a to 67d also serve as an energization path between the two circuit boards 73 and 74, and the circuit components mounted on the first and second circuit boards 73 and 74 are electrically connected via the contact pins 67a to 67e. Connected. In addition, a through hole 75 opened in the center of the housing 75
A contact pin 67e is provided in the vicinity of b, and this contact pin 67e becomes the lead 70a of the test circuit 70 which penetrates the 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, which communicate with the through hole 75b of the housing 75 and into which the braided wires 79A and 79B are inserted. Further, on the first circuit board 73, one end of the lead wire 82A connected to the voltage pole of the main circuit via the conductive plate 71A and a connection for connecting to the neutral pole (or another voltage pole) of the main circuit. The other end of the lead wire 82B having one end welded to the member 99 is connected.

Further, the second circuit board 74 is attached to the side surface of the zero-phase current transformer ZCT opposite to the first circuit board facing surface side, but in the same direction as the protruding direction of the coil frame holding portion 310. An insulating plate 320 is provided so as to extend between the second circuit board 74 and the coil frame 69. As a result, the distance between the second circuit board 74 and the coil frame 69 can be narrowed, and the two circuit boards 73 and 74 are arranged so as to sandwich the zero-phase current transformer ZCT. It can be compactly stored in the body 1, and the body 1 can be made compact.

This insulating plate 320 is used for the second circuit board 74.
And a first insulating piece 321 interposed between the coil frame 69 and
A second insulating piece 322, which is continuously provided so as to sandwich the second circuit board 74 with the first insulating piece 321, and a connecting piece 32 for connecting the first insulating piece 321 and the second insulating piece 322.
3 and the second insulating piece 322 includes a zero-phase current transformer ZCT.
Of the through hole 324 facing the electric path insertion hole 75b of
A cut 325 that is continuous from 4 to the end face is formed. In this way, the insulating plate 321 is arranged so as to sandwich the second circuit board 74, and the conducting wire 7 serving as an electric path from the cut 325.
9A and 79B are inserted, the insulating plate 320 does not come off due to the conducting wires 79A and 79B.
The work of attaching and detaching becomes easy.

Thus, a plurality of types of circuit parts constituting the leakage protection circuit 51 are mounted on the first and second circuit boards 73 and 74, and the first and the second circuit boards ZCT are provided on both sides in the thickness direction. 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. In addition, contact pins 67a to 67 that are mounting portions on the housing 75 of the zero-phase current transformer ZCT.
By providing e, the first and second circuit boards 73,
The zero-phase current transformer ZCT can be easily attached to 74. Further, the mounting portion is made up of metal contact pins 67a ...
67d, which is a current-carrying path for electrically connecting the first and second circuit boards 73 and 74, so that the current-carrying path between the circuit boards 73 and 74 is different from the case of separately using lead wires or the like. The contact pins 67a to 67e can be insulated from the winding of the zero-phase current transformer ZCT by insert molding (or press-fitting) the housing 75 into the housing 75.

The contact pin 67e 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, the lead wire 82A for connecting to the voltage pole of the main circuit and the neutral pole (or another voltage pole)
Since the lead wire 82B for connecting to the second circuit board is connected to the first circuit board 73 on which a high-voltage circuit component is mounted,
In the circuit board 74, 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.

Further, as described above, the earth leakage detecting device which is connected to the electric path between the input and output terminals of each pole and outputs the earth leakage detecting signal when the predetermined output of the zero-phase current transformer ZCT reaches a predetermined time,
Each connection point is closer to the input terminal than the contact of each pole.
Therefore, when the circuit breaker is turned off and the test pin is contacted between the output terminals to measure the insulation of the load, the test current for measuring the insulation resistance does not flow through the connection point of the leakage detection device, Therefore, the load insulation can be easily measured. Further, since the input-side terminal is always a plug-in type and the output-side terminal is a connecting terminal having a locking spring, there is no risk of an operator accidentally making a reverse connection. Therefore, if there is a power supply connection point of the leakage detection device on the input side, it is possible to easily measure the insulation resistance on the output side.

Further, one of the connection points of the leakage detecting device is arranged on the fixed contact facing surface side of one of the movable contacts 4B so that the movable contact 3B is in contact with the fixed contact 2B.
The movable contact 3B is separated from the movable contactor 4B while being in contact with B and the movable contact 3B being separated from the fixed contact 2B. For this reason, when the contact portion is in the OFF state, the leakage detection device is not energized, and it is possible to prevent the leakage detection device from being damaged due to the test switch SW being kept on. That is, when the test switch SW is turned on to open the contact, no current flows in the leakage detection device, and the leakage detection device is less likely to be destroyed.

The movable contactor 4B is composed of a leaf spring which is driven by the opening / closing operation of the handle 6, and the connecting member 99 which is one of the connection points of the leakage detecting device is an elastic conductive plate which is displaced in the same direction as the leaf spring. . Therefore, the movable contact 4
When the elastic conductive plate comes into contact with B, the wiping action works,
Contact reliability is improved. Further, when the elastic conductive plate comes into contact with the leaf spring, the elastic conductive plate is also displaced in the same direction as the leaf spring, so that the leaf spring is less likely to be deformed and contact reliability of the contacts is improved. If one of the connection points of the leakage detecting device is a rigid body instead of the elastic conductive plate, the leaf spring will be easily deformed with the rigid body serving as a fulcrum.

The movable contact 3B contacts the fixed contact 2B earlier than the other movable contact 4A when the handle is operated, and the movable contact 3B is fixed later than the other movable contact 4A. To move away from the contact 2B
When the movable contactor 4A is configured to contact and separate from the fixed contact 2B with a time lag with respect to the opening / closing operation of the other movable contactor 4A, the movable contacts 3A and 3B of both the movable contactors 4A and 4B are fixed contact 2A,
If only the movable contact 3b of one of the first and second movable contacts 4B before contacting 2B is in contact with the fixed contact 2b, power is supplied to the earth leakage detection device, and quick earth leakage protection can be performed. . Further, the body 1 is provided with an abutting portion 330, at least when the handle 6 is turned on, the side surface of the elastic conductive plate serving as the connecting member 99 opposite to the contact surface of the movable contactor contacts. It is possible to increase the spring load when coming into contact with, and to ensure the supply of power to the leakage detection device even during vibration or impact.
On the other hand, a partition member 31, which is an intermediate partition for arranging the input / output terminals and contact portions of each pole along the width direction of the body 1 and isolating the contact portion of each pole, is arranged in the body 1. The partition wall member 31 holds an elastic conductive plate which is the connection member 99. In this case, a shaft 332 is provided at the lower end portion of the partition member 31, a mounting piece 334 is provided at the base end portion of the connection member 99, which is bent from the side surface and raised, and a mounting hole 333 is formed in the mounting piece 334. The hole 333 is fitted to the shaft 332, and the partition member 3
1 and the bottom surface of the first side case 1A of the body 1. In this way, since the elastic conductive plate can be incorporated into the body 1 while being held by the partition member 31, the assembling work becomes easy. Further, the elastic conductive plate can be surely opposed to the movable contactor 3B after being assembled, and the power supply to the leakage detection device can be surely turned on / off.

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 provided.
Is assembled in a fixed position together with the return spring 21. Further, the handle 6 is incorporated in a predetermined position together with the torsion spring. Then, in the crossbar 40, the movable contactor 4A is fitted into the cut groove 54, and the coil spring 53 is housed in the recessed portion.
The coil spring 62 is rotatably arranged at a predetermined position of the side case 1A. Further, the operating plate 43 is arranged so as to be connected to the handle 6 by a link 44.

Further, the common 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 abutted against the second side case 1B. It is stored in a compartment inside the first side case 1A corresponding to the inner storage section 200. A slide groove 207 that allows the leg piece 83a of the slide member 83 to be formed on the outer surface of the side wall of the first side case 1A through the insertion hole 208.
To expose the protrusion 206 to the outside.

Further, the separation wall 91 formed in the height direction of the first side case 1A along the inner storage portion 200, and the first
In the upper portion of the space between the separation wall 65 formed in the height direction so as to face the separation wall 91 at approximately the center in the longitudinal direction of the side case 1A,
The second circuit board 74 having a long longitudinal dimension is separated from the separation wall 91.
The first and second circuit boards 73 and 74 attached to the zero-phase current transformer ZCT are housed on the side, and the first and second electromagnetic release devices 47 and 48 are housed in the lower part of the space.
Here, two ribs 92 are provided along the width direction of the body 1 at a site in the vicinity of the separation wall 91 on the bottom of the first side case 1A, and a fitting formed between the two ribs 92. Groove 92a
By fitting the lower end of the second circuit board 74 to
Positioning the second circuit board 74 so that its longitudinal direction substantially coincides with the height direction of the first side case 1A and the axial direction of the zero-phase current transformer ZCT substantially coincides with the longitudinal direction of the first side case 1A. It is fixed.

Further, rectangular window holes 98 are opened in the side walls of the both-side cases 1A and 1B, which face the zero-phase current transformer ZCT, and the housing 75 has the largest width as shown in FIG. It is inserted in 98 to allow the housing 75 to escape. That is, since the width dimension of the housing 75 of the zero-phase current transformer ZCT is slightly larger than the width dimensions of the first and second circuit boards 73 and 74, if the width dimension of the body 1 is adjusted to the width dimension of the housing 75. Although a useless space is generated, the window hole 98 is provided and the housing 75 is provided as described above.
By escaping the space, it is possible to prevent useless space from being generated and to reduce the width dimension 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 project beyond the side wall outer surfaces of the both-side cases 1A and 1B.

On the other hand, the first and second electromagnetic release devices 47,
As shown in FIG. 4, the reference numeral 48 designates the movable iron core 58 downward in the height direction of the body 1 and the first side case 1A at the lower part of the space.
The zero-phase current transformer ZCT is arranged on the bottom of the fixed 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 springs 59 are arranged at the bottom of the container 1 along the height direction of the container 1, and at the top of the fixed iron core 57 and the movable iron core 58,
Zero-phase current transformer Z with the axial direction substantially aligned with the longitudinal direction of the body 1
When the CT is arranged, the conducting conductor 80 sandwiched between the fixed iron core 57 and the movable iron core 58 can be arranged in the body 1 with the extending direction thereof aligned with the longitudinal direction of the body 1. The size of 1 in the height direction can be reduced. 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, zero-phase current transformer ZC
Since the axial direction of T coincides with the longitudinal direction of the body 1,
Connect the main circuit circuit (braided wires 79A, 79B) to the zero-phase current transformer Z.
Work to penetrate CT can be easily performed. 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 passed through the zero-phase current transformer ZCT in advance, the distance over which the braided wires 79A and 79B are drawn 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 zero-phase current transformer ZCT does not affect the suction operation of the movable iron core 58, and the contact opening characteristic of the main contact described later is stabilized. You can

Here, in the movable contactor 4B having the rear end portion connected to the front end portion of the outer piece 80b, the obliquely upwardly inclined portion of the central portion thereof is located slightly above the bottom portion 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 via the notch 14a. At this time, the rear end portion of the movable contactor 4B is sandwiched and fixed by a plurality of ribs 96 protruding from the bottom surface of the parallel portion of the partition wall 95 and the bottom portion of the first side case 1A. Further, at this time, the connection member 99 connected to the first circuit board 73 and the lead wire 82B is sandwiched and fixed between the bottom portion of the first side case 1A and the movable contactor 4B to fix the leakage protection circuit 51 and the test circuit 70. Is connected to the electrical path of the neutral pole (or other voltage 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 circuit components of the weak electric system, such as C (leakage current determination circuit 51a), which are weak against heat.

Furthermore, the first trip plate 41 is rotatably arranged at a fixed position together with the torsion spring 301, and
The second trip plate 42 is rotatably arranged at a fixed position. At this time, the receiving portion 42c of the second trip plate 42 faces the tip of the movable iron core 58.

Thus, as shown in FIG. 13, 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 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 contactor 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 to be joined. At this time, the claw-shaped hooking locking portions 101 at the tips of the elastic locking pieces 100 at the four positions above and below both ends that are integrally projected from the first side case 1A to the second side case 1B side correspond to the second side case 1B side. And the first side case 1
A and the second side case 1B are coupled and fixed to form the body 1 (see FIGS. 4, 5, 12, etc.). When removing the fixed connection between the first side case 1A and the second side case 1B, a driver is inserted into the second side case 1B through each release hole 150 opened corresponding to each hooked portion 102. By pressing the hook locking portion 101 of each elastic locking piece 100 upward to release the hooked state with the hooked portion 102, the second side case 1B can be removed from the first side case 1A.

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

Further, the heads of the adjusting screws 77, 77 'corresponding to the bimetals 45, 46 are exposed through the notches 31e of the partition member 31 to the opening 104 opening on the upper surface of the body 1, and after assembly. Of the operation adjusting screw 7 through the opening 104 so that the optimum operating point can be obtained during the operation test of
7 and 77 'are screwed, and the tip of the bimetal 45 and the first
The distance between the leg portion 41c of the trip plate 41 and the tip end portion of the bimetal 46 and the drive piece 42d of the second trip plate 42 is adjusted, and after the adjustment, the lid 106 is used to utilize the elasticity of the body 1. The opening 104 is fitted into the peripheral portion of the opening 104
Cover up.

As shown in FIG. 5, 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, and 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, 48 along the longitudinal direction of the body 1, the bimetals 45, 46 and the electromagnetic release devices 47, 48 are set. In addition, the interval with the zero-phase current transformer ZCT (second circuit board 74) can be narrowed to reduce the size of the body 1 in the longitudinal direction.

Since the partition walls 31a of the partition member 31 isolate the bimetals 45 and 46 from each other, the partition walls 31a can insulate the bimetals 45 and 46 from each other and can 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. In addition, a fixed iron core 57 and a movable iron core 58 are also included.
The two electromagnetic release devices 47, 48 are also provided with the partition wall 3 in the width direction of the body 1.
Since it is arranged so as to straddle 1a, the width dimensions of the fixed iron core 57 and the movable iron core 58 can be made sufficiently large, and the electromagnetic attraction force can be increased to shorten the time required to open the main contact. it can.

Thus, the inner storage portion 20 inside the other end of the container 1
0 and the accommodating portion 90 accommodate the selection terminal T2 and the common 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, and the respective terminal blocks 10A and 1B are inserted.
0B, the conductive bar of the voltage pole is plugged and connected to the common terminal T1 in the width direction via the plug 209c, and the conductive bar of the neutral pole or the conductive bar of another voltage pole is plugged in the plug 209a or By inserting and connecting the selection terminal T2 in the width direction through the inserting portion 209b, the earth leakage breaker of this embodiment can be inserted into the electric circuit.

By the way, as shown in FIG. 3, 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 attached to the projecting base 105 so that the test button 78 is movable in the height direction of the body 1 and is prevented from coming off by being locked to the peripheral edge of the body 5a. The tip of the test button 78 has a movable contact plate 76 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 of the test button 78 to drive the fixed contact 7
The test switch SW can be turned on by bringing it into contact with 6b. The lid 106 is provided with a semi-circular cutout 106a through which the test button 78 is inserted in order to avoid interference with the test button 78.

Here, as shown in FIG. 12, window holes 98 are formed in both side surfaces of the body 1 to partially expose the housing 75 of the zero-phase current transformer ZCT. 1
In order to prevent foreign matter from entering the inside and to improve the appearance, a rectangular tube-shaped insulating sheet 107 made of an insulating sheet-shaped material is attached to the body 1 to form a window hole 98. Is covering up.

Next, the operation of this embodiment will be described with reference to FIGS.
~ It demonstrates with reference to FIG. FIG. 13 shows an open state. In this open state, the operating portion 6a of the handle 6 is exposed from the window hole 50 upside down, and the engagement state between one end of the operating plate 43 and the first trip plate 41 is shown. It is in a detached state.
The cross bar 40 is biased by the coil spring 62 so as to rotate clockwise in the drawing, and the movable contact 4A inserted into the cut groove 54 of the cross bar 40 moves the free end upward. The movable contact 4B inserted into the cut groove 55 has its free end moved upward by its spring elastic force, and the movable contacts 3A and 3B provided at the respective free ends are Corresponding fixed contacts 2A, 2B
Is 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. By pushing down the operating plate 43, one end (the right end in the drawing) of the operating plate 43 hits the locking portion 41e of the first tripping plate 41, and the operating plate 43 rotates counterclockwise around that position as a rotation center. The other end (left end) of the operating plate 43 hits a protrusion 84 provided on the upper end of the crossbar 40, and the crossbar 40 is rotated counterclockwise 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. In addition, the movable contactor 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 2A. This contact is delayed from the contact of the movable contact 3B with the fixed contact 2B, and the movable contact 3B is the first contact.

When the handle 6 is further rotated clockwise, the upper shaft 44a moves leftward from the line connecting the position of the lower shaft 44b of the link 44 and the rotation center of the handle 6, as shown in FIG. In this state, the torsion spring of the handle 6, the coil spring 62 for urging the crossbar 44, the spring force of the movable contactor 4B, etc. are balanced to lock one end of the operating plate 43 and the first tripping plate 41. The latched state with 41e is maintained, and the closed state of FIG. 2 is maintained.

When the operating portion 6a of the handle 6 is turned counterclockwise in the closed state, the upper shaft 44a of the link 44 is rotated.
Is moved to the right above the line connecting the center of rotation of the handle 6 and the lower shaft 44b, and moves upward, so that the left end of the operating plate 43 and the locking portion 41e of the first trip plate 41 are latched. Then, the crossbar 40 is rotated clockwise by the biasing force of the coil spring 62, and the handle 6 is rapidly rotated back to the off side by the biasing force of the torsion spring. Crossbar 4
When 0 rotates clockwise, the movable contactor 4A rotates clockwise to move the free end upward so that the movable contact 3A is separated from the fixed contact 2A. Further, the movable contact 4B is no longer pushed downward, and the spring force restores the original state, so that the movable contact 3B at the free end is fixed to the fixed contact 2B.
More open. This separation is delayed after the movable contact 3A is separated 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 body side, and the movable contact made of a spring material. It is possible to prevent consumption due to the 3B arc.

Further, the stoppers 130 formed on both the cases 1A and 1B and the intermediate case 7 in the concave 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 in from the crossbar 40 side on the back side of the body 1 and enter the other section. 1. Prevent short circuit between electrodes due to arc inside.

In the closed state shown in FIG. 2, when an overcurrent flows in the load, the bimetals 45 and 46 generate heat due to the overcurrent and are bent and displaced. Here, the bimetals 45 and 46 hanging from above are displaced so that their lower ends move to the left in the figure, and the lower ends of the bimetals 46 move the drive piece 42d of the second trip plate 42 to the left as shown in FIG. Push the lower end of the bimetal 45 to the first trip plate 4
The receiving portion (not shown) at the tip of the leg portion 41c of No. 1 is pushed leftward. In addition, the displacement of the bimetal 46 causes the second trip plate 4 to move.
2 rotates counterclockwise, and the facing portion 4 of the second trip plate 42
2a pushes the receiving portion 41f of the first trip plate 41 leftward. The receiving portion 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.
It is rotated clockwise by being pressed by.

When the first trip plate 41 is rotated 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 moves the lower shaft 44b of the link 44. It will rotate clockwise around. Therefore, the other end (left end) of the operating plate 43 causes the crossbar 40 to move.
15 is removed, 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 devices 47 and 48 to forcibly open the main contact to protect the load.

After that, the bimetal 45,
46 returns to the original state, the first tripping plate 41 returns to the original position by the biasing force of the torsion spring, and at the same time, the facing portion 42a of the second tripping plate 42 is pushed by the receiving portion 41f to move to the first position. 2 Return the trip plate 42 to its original position. Further, the handle 6 is rotated in the opening direction (counterclockwise) by the bias of the torsion spring.

In addition, when an excessive current such as a short-circuit current flows in the conducting conductor 80 in the above-mentioned closed state, the fixed iron core 57
An electromagnetic attraction force is generated on the movable iron core 58 to attract and swing it. Further, the magnetic plate 340 is attracted to the yoke 341.
As a result, as shown in FIG. 12, the tip of the movable iron core 58 pushes the receiving portion 42c of the second trip plate 42 to rotate the second trip plate 42 counterclockwise. When the second trip plate 42 rotates counterclockwise as in the case where the overload current flows, the facing portion 42a of the second trip plate 42 causes the first trip plate 4 to move.
The receiving portion 41f of No. 1 is pushed to the left and rotated clockwise. The first trip plate 41 also receives rotational force in the clockwise direction when the magnetic plate 340 is attracted by the yoke 341.
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 removed, the crossbar 40 is rotated clockwise by the spring force of the coil spring 62, and the movable contacts 4A and 4B are returned to the open state. The movable contacts 3A, 3B are fixed contacts 2A, 2
Separate from B respectively. That is, when an overcurrent (instantaneous large current) such as a short-circuit current flows in the main circuit, the third electromagnetic release device 47 including the first electromagnetic release device 47, the magnetic plate 340, the bimetal 45, and the yoke 341 is used. The opening / closing mechanism 5 is released by the device 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, and the first trip plate 41 is returned to the original position by the biasing force of the torsion spring, and at the same time, the facing portion 42a of the second trip plate 42 is pushed by the receiving portion 41f. Move the second trip plate 42 back to its original position. Handle 6
Is rotated in the opening direction (counterclockwise) by the bias of the torsion spring.

Further, when a leakage current such as a ground fault current flows in the above-mentioned closed state, the earth leakage protection circuit 51 energizes the coil 68 to generate an electromagnetic attraction force on the fixed iron core 57 to attract the movable iron core 58. To rock. As shown in FIG. 16, as in the case where a short circuit current flows,
The tip of the movable iron core 58 is the receiving portion 42 of the second trip plate 42.
By pressing c, the second trip plate 42 is rotated counterclockwise and the first trip plate 41 is rotated clockwise to return the movable contacts 4A and 4B to the open state to move the movable contact 3
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 / closing mechanism 5 is released by the second electromagnetic release device 48 constituting the earth leakage trip means to forcibly open the main contact. And the ground fault can be protected.

[0111]

According to the earth leakage breaker of the first aspect, the space in the height direction of the circuit board can be effectively utilized, and the body can be made compact especially in the height direction.

According to the earth leakage circuit breaker of the second aspect, in addition to the same effect as the first aspect, the earth leakage test movable plate is connected to the circuit in which the earth leakage test fixed contact is directly attached to the end face of the circuit board. Even if it comes close to the end face of the substrate, it can be sufficiently separated from the fixed contact for the leakage test, and thus the interval between the upper and lower surfaces of the body can be narrowed, and the body can be made compact.

According to the earth leakage circuit breaker of the third aspect, in addition to the same effect as that of the second aspect, since the earth leakage test fixed contact is in the recess of the end face of the substrate, the tip of the earth leakage test movable plate is formed as it is. It is possible to easily contact the earth leakage test fixed contact with the earth leakage test fixed contact, and it is easy to ensure contact between the earth leakage test fixed plate and the earth leakage test fixed contact, and the earth leakage test movable plate contacts the end surface of the circuit board. Hard to do.

According to the earth leakage circuit breaker of claim 4, in addition to the same effect as that of claim 1, claim 2 or claim 3, the end face of the earth leakage test movable plate is brought into contact with the circuit board, and this point is Since the earth leakage test movable plate contacts the earth leakage test fixed contact as a fulcrum, elasticity of the earth leakage test movable plate can be easily obtained.

[Brief description of drawings]

FIG. 1 is an exploded perspective view around a zero-phase current transformer according to an embodiment of the present invention.

FIG. 2 is a side view showing the loading state of the embodiment with the second side case removed.

FIG. 3 is an exploded perspective view of the above.

FIG. 4 is a vertical cross-sectional view of the vicinity of a zero-phase current transformer.

FIG. 5 is a vertical sectional view of a position of a bimetal.

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

FIG. 7 is a perspective view of the first and second 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 including an insulating plate around a zero-phase current transformer.

FIG. 10 is a front view of a circuit board.

FIG. 11 is a perspective view of a partition member.

FIG. 12 is a perspective view of an earth leakage breaker.

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

FIG. 14 is a side view showing a state in which one of the movable contactors is inserted first in the stage of rotating the handle from the open state to the closed state, and the second side case is removed.

FIG. 15 is an explanatory view of a state of an overcurrent trip operation due to an overload current of the above.

FIG. 16 is a state explanatory view of an overcurrent trip operation by a short circuit current and an earth leakage trip operation by a ground fault current.

[Explanation of symbols]

1 body 2A, 2B fixed contact 3A, 3B movable contact 5 open / close mechanism 6 handles 41 First Tripping Plate 42 Second trip plate 47 First Electromagnetic Release Device 48 Second Electromagnetic Release Device 51 Leakage protection circuit (leakage detection circuit) 57 fixed iron core 58 movable iron core 68 Tripping coil 69 coil frame 69b holding piece 69c Mounting pin 73 circuit board 74 circuit board 76a Moving contact board (moving board for earth leakage test) 76b Earth leakage test fixed contact 78 Leakage test button 326 dent 329 Tip of test movable plate 360 Opposite edge of test movable plate ZCT Zero-phase current transformer

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hiroshi Fujiki             1048, Kadoma, Kadoma-shi, Osaka Matsushita Electric Works             Within the corporation (72) Inventor Mutsumi Ichimura             1048, Kadoma, Kadoma-shi, Osaka Matsushita Electric Works             Within the corporation (72) Inventor Kazuki Hirooka             1048, Kadoma, Kadoma-shi, Osaka Matsushita Electric Works             Within the corporation (72) Inventor Takashi Inagi             1048, Kadoma, Kadoma-shi, Osaka Matsushita Electric Works             Within the corporation (72) Inventor Fujio Nishiyama             1 Tokai Electric Works Co., Ltd., 68 Kawabe-cho, Tsu City, Mie Prefecture             Inside the company (72) Inventor Hiroshi Shimamura             1 Tokai Electric Works Co., Ltd., 68 Kawabe-cho, Tsu City, Mie Prefecture             Inside the company (72) Inventor Yoji Onishi             1 Tokai Electric Works Co., Ltd., 68 Kawabe-cho, Tsu City, Mie Prefecture             Inside the company F-term (reference) 5G030 XX08 XX17 YY05

Claims (4)

[Claims] 1. A handle operable from the upper surface of the body,
The contacts of a plurality of poles that are opened and closed by the turning operation of the handle, a zero-phase current transformer that detects an unbalanced current between the poles, an earth leakage test button arranged on the upper surface of the body, and the earth leakage test button. When the earth leakage test movable plate driven by the operation of the test button and the earth leakage test movable plate come into contact with or separate from each other, the earth leakage test fixed contact that causes a pseudo unbalanced current to flow into the zero phase current transformer is attached, and A current leakage detection circuit that supplies an exciting current to the trip coil for forcibly opening the contacts of each pole when the unbalanced current is detected by the current transformer is mounted. And a circuit board arranged so as to face each other, wherein the earth leakage test movable plate is arranged on an end surface side of the circuit board located on the upper surface side of the body, and the earth leakage test Place the fixed contact on the upper side of the body. An earth leakage breaker formed on an end surface of the circuit board to be placed. 2. The earth leakage breaker according to claim 1, wherein a recess is provided in an end surface of the circuit board, and the earth leakage test fixed contact is arranged in the recess. 3. The earth leakage breaker according to claim 2, wherein the tip of the test movable plate is bent toward the fixed contact. 4. The earth leakage breaker according to claim 1, wherein the earth leakage test movable plate is bent such that an end surface of the earth leakage test fixed contact opposite to the contact end surface of the earth leakage test fixed contact is in contact with the circuit board. .