JPH08138521A - Earth-leakage circuit breaker - Google Patents

Abstract

PURPOSE: To properly turn off a test switch after breaking a main cable way. CONSTITUTION: A zero-phase current transformer 92 has a main cable way between a power source and a load as a primary side, and the unbalance of current flowing therein is detected via secondary output, thereby actuating an electromagnetic device 100. This device 100 drives an open/close device via an interlocking lever 103, and causes a moving contactor 33y held on a moving body to part. Also, a test switch 93 has a moving piece 142a coming in contact with a contactor plate 141 under a pressing force from a pushbutton 143, and causes the current transformer 92 to generate secondary output, thereby actuating the device 100. Furthermore, a moving body 121 has a positional restriction projection 121i, and separates the piece 142a from the plate 141, upon departure of the contactor 33y. The projection piece 212i comes in contact with the piece 142a between the position where the pressing force of the pushbutton 143 acts and another position faced to the plate 141.

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 shutting off a main circuit when a leakage current or a ground fault current flows in the main circuit between a power source and a load.

[0002]

2. Description of the Related Art Generally, an earth leakage circuit breaker of this type is equipped with a test switch for artificially generating a state of earth leakage, as disclosed in Japanese Patent Publication No. 62-35213, so that the main electric circuit is surely provided at the time of earth leakage. It is possible to carry out an operation test of whether or not to cut off. By the way, the test switch has a contact made up of a flexible movable piece and a contact plate fixed at a fixed position, and the contact point is formed by applying a pressing force from a push button to the intermediate portion of the movable piece. Is turned on to generate a pseudo leakage current. On the other hand, if the test switch is kept on after the main circuit is cut off by operating the test switch, a leakage current may continue to flow, resulting in a failure. Therefore, in order to avoid such a situation, when the main electric path is cut off, the movable piece is pressed from the contact piece plate by pressing the tip side of the movable piece in a direction away from the contact piece plate with the contact piece plate. This prevents the test switch from being forcibly released and the test switch to remain in the ON state.

[0003]

Even with the above configuration, it is possible to prevent the test switch from being kept in the ON state.
There is a variation in the positional relationship between the position where the stress from the push button acts on the movable piece, the position where the movable piece is pressed in the direction to pull it away from the contact plate, and the contact position with the contact plate,
When the pushing force of the push button is strong, it may not be possible to separate the movable piece from the contact plate. In other words, the movable piece comes into contact with the contact plate between the position where the force acts in the direction of bringing the movable piece closer to the contact plate and the position where the force in the direction of separating the movable piece from the contact plate acts. Therefore, even if the tip of the movable piece is pressed in a direction to pull it away from the contact plate, the movable piece may not be separated from the contact plate.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an earth leakage circuit breaker capable of reliably separating the movable piece from the contact plate after the main electric path is cut off. To provide.

[0005]

In order to achieve the above object, the present invention provides a zero-phase current transformer having a main electric path between a power source and a load as a primary side and a current passing through the main electric path. When the equilibrium occurs, the secondary output of the zero-phase current transformer operates to open the movable contact to drive the contact to shut off the main circuit, and a pseudo-current on the primary side of the zero-phase current transformer. In a ground fault circuit breaker equipped with a test switch that is operated so that an unbalanced current flows, the test switch includes a flexible movable piece that receives a pressing force from a push button and a contact that faces a part of the movable piece. And a contact plate that configures the contact plate, and the earth leakage breaker includes a position control projection that presses the movable piece in a direction of separating it from the contact plate when the movable contact is opened. The position is located closer to the tip of the movable piece than the position where the push force from the push button acts, and The point of application of pressing force by the regulating protrusion adopts the structure which is located between the position where pushing force is applied from the contact position and the push button of the contact terminal plate of the movable piece.

[0006]

According to the structure of the present invention, the contact position of the movable piece with the contact plate is located closer to the tip end side of the movable piece than the position where the pressing force from the push button acts, and the pressing force of the position regulating projection piece is used. Is located between the contact position on the movable piece with the contact plate and the position where the pushing force from the push button acts, the main circuit is interrupted by the detection of leakage and the movable piece When a pressing force that pulls the contact plate away from the contact plate is applied to the contact plate, the part of the movable piece facing the contact plate located on the tip side of the contact plate located on the tip side of the position that receives the pressing force from the position control projection is surely secured from the contact plate. Can be pulled apart. Further, in this configuration, the stronger the pressing force from the push button, the greater the distance from the contact plate of the movable piece, so it is possible to reliably prevent the test switch from continuing to be in the ON state after the main electric circuit is cut off. .

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIGS. 1 to 6, a body 10 made of an insulating synthetic resin is provided.
a and a pair of covers 10bx and 10by, which are respectively attached to both sides of the body 10a, with rivets 11 (see FIG. 5).
It is formed by combining with. That is, assembling holes 12a, 12bx, 12by are provided at four positions in the peripheral portion of the body 10a and the covers 10bx, 10by, and the rivets 11 are inserted into the assembling holes 12a, 12bx, 12by, respectively. And both covers 10bx and 10by can be connected. A storage space is formed between the body 10a and each of the covers 10bx and 10by, and a contact portion 30x inserted into the voltage line is stored in the storage space between the body 10a and the cover 10bx. 10 by
The contact space 30y inserted into the ground wire in the storage space between
Is stored. In the following, the cover 10bx side with respect to the body 10a is the voltage electrode side, and the cover 1 with respect to the body 10a.
The 0 by side is called the ground electrode side.

A pair of movable terminals 20ax, 20ay and a pair of fixed terminals 20bx, 2 are provided at both front and rear ends of the body 10.
0 by is provided. Movable side terminals 20ax, 20ay
Terminal plates 21ax and 21ay provided with fixed contacts 31x and 31y (see FIGS. 1 and 3) are electrically connected to. Here, the configuration on the voltage electrode side will be described first. A terminal plate 21bx, to which one end of a bimetal 61 forming the thermal release device 60 is fixed, is electrically connected to the fixed side terminal 20bx of the voltage side pole. Fixed contact 31x is movable contact 33
A contact portion 30x is configured with a movable contact 32x provided at x, and the movable contactor 33x separates from and contacts the fixed contact 31x according to the operation of the opening / closing device 40 described later. Movable contact 3
3x is electrically connected to one end of a coil 51 of an electromagnetic release device 50 described later via a connecting wire 37x made of a braided wire, and the other end of the coil 51 is an intermediate portion of a bimetal 61 via a connecting wire 38x made of a braided wire. Connected to the department. Therefore, when the contact portion 30x is closed, the movable side terminal 20ax-
A main electric path through which a current flows is formed by a path of the contact portion 30x-coil 51-bimetal 61-fixed side terminal 20bx. The intermediate portion of the connecting wire 38x is inserted into the storage space on the ground electrode side through the insertion hole 19a provided in the body 10a. This structure will be described later. The bimetal 61 may be either a direct heating type that bends by self-heating, or an indirectly heating type that bends when heated by a heater in which plate heaters are stacked.

A handle insertion hole 13 that opens in a rectangular shape when the body 10a and the cover 10bx are butted against each other is formed on the upper surface of the body 10, and as shown in FIG. 3, inner surfaces of the body 10a and the cover 10bx are formed. A cylindrical bearing 14 is provided in the vicinity of the handle insertion hole 13 so as to project. Each end of a handle shaft 42 that pivotally supports the operation handle 41 is inserted into a bearing hole 14a that opens in the center of the bearing 14. The operation handle 41 is provided with an operation portion 41 a that protrudes to the upper surface of the body 10 through the handle insertion hole 13. In other words, the operation handle 41 has the handle shaft 42 within a range in which the operation portion 41 a can move in the handle insertion hole 13.
It can be freely rotated around. Operation unit 4 of the operation handle 41
An arc-shaped cover piece 41b centered on the handle shaft 42 is formed at the base of 1a, and the peripheral portion of the handle insertion hole 13 in the body 10 bulges outward along the cover piece 41b. Since the cover piece 41b is in sliding contact with the inner side surface of the body 10, even if the operation handle 41 rotates, the cover piece 41b.
The inside of the body 1 is shielded so that it cannot be seen, and the cover piece 41b is marked with a character indicating the opening / closing of the contact portion 30x according to the operation of the operation handle 41. A link support portion 41c is provided on the lower surface of the cover piece 41b, and shaft protrusions 41d are provided on both lower side surfaces of the link support portion 41c. Here, the operation portion 41a and the link support portion 41c are
Cover piece 41 so that it is not in a straight line and has a substantially V-shaped cross section
Mutual protrusion directions with respect to b are set. further,
The operation handle 41 is biased counterclockwise in FIG. 3 by a handle return spring 43, which is a scissor-shaped spring mounted around the bearing 14. That is, one end of the handle return spring 43 is locked to the right end of the cover piece 41b in FIG. 4, and the other end of the handle return spring 43 is provided on the trip plate 4 of the opening / closing device 40 described later.
4 is locked.

The opening / closing device 40 has a flat plate shape, and a handle link 45 into which a shaft projection 41d provided on the operation handle 41 is inserted into a bearing hole 45a formed in the tip of each leg piece. Locking plate 46a on both ends of the locking plate 46a
A latch plate 46 in which the handle shaft 42 is inserted into a shaft hole 46c formed at the tip end of the guide piece 46b, the guide plate 46b being provided with a pair of guide pieces 46b that are substantially orthogonal to each other and extend in the direction along the edge of the locking plate 46a. And the body 10 inserted through the trip plate 44.
The shaft pin 4 rotatably supports the trip plate 44 with respect to the body 10 by inserting each end into a bearing hole 15a formed in a bearing 15 formed on the inner surface of each of the a and the cover 10bx.
7 and the substantially leg-shaped one leg piece 48a has the other leg piece 4a.
And a metal contact link 48 formed to be longer than 8b. The one leg piece 48a of the contactor link 48 is inserted into the link hole 45b provided at the base of both leg pieces of the handle link 45 through the guide holes 46d formed in both guide pieces 46b of the latch plate 46, and the contactor link 48 is formed. The other leg piece 48b of the above is the shaft hole 33 provided in the movable contact 33.
It is inserted through a. An arcuately curved guide hole 16 convex downward in FIG. 3 is formed on the inner surface of the body 10a, and the tip end portion of the leg piece 48b of the contactor link 48 is inserted into the guide hole 16. Thus, the movement range of the contact link 48 is regulated by the guide hole 16.

The movable contact 33x has a movable contact 3 at one end.
2x and a spring receiving piece 33bx at the other end, and the leg piece 48b of the contact link 48 is inserted into a portion between the movable contact 32x and the spring receiving piece 33bx.
It is formed in a shape having a bearing piece 33c which is open at 3a. Here, the movable contact 33x formed of a plate material
One end of the movable contact 33 is bent into a substantially L shape, and its corner is used as the movable contact 32x.
An arc traveling piece 33d is extended to the tip side of 2x. A spring seat (not shown) that is inserted into one end of an opening spring 34x made of a coil spring is protrudingly provided on the spring receiving piece 33bx. Further, the other end of the opening spring 34x has a spring receiving recess 35x formed on the inner surface of the body 10a.
Is stored in. On the inner surface of the body 10a, a stopper 36 is provided so as to project in a plane substantially parallel to the opening surface of the spring receiving recess 35x, and the body 10 having the spring receiving recess 35x is formed.
In the space between the inner surface of a and the stopper 36, the spring receiving piece 3
Part of 3bx is inserted, and the spring receiving piece 33bx is biased toward the stopper 36 by the spring force of the opening spring 34x.

The trip plate 44 has a first pressing piece 44b projecting from the upper end of the base piece 44a to one side and a base piece 4a.
The second pressing piece 44c extends downward from 4a,
Further, the arm piece 44d is formed to project from one side edge of the base piece 44a in the upper and lower intermediate portions in a direction substantially orthogonal to the base piece 44a. A shaft pin 47 is inserted through the arm piece 44d, and the trip plate 44 is rotatable around the shaft pin 47. Further, a hooking groove 44e is formed on the upper edge of the tip end of the arm piece 44d, and the upper edge of the arm piece 44d is inclined so that the upper edge of the arm piece 44d becomes closer to the lower edge on the tip side of the hooking groove 44e. Further, a locking recess 44f having a shape that is opened laterally and cut upward is formed at a side edge of the base piece 44a, and one end of the handle return spring 43 is locked in the locking recess 44f. By doing so, the trip plate 44 is biased counterclockwise in FIG.

The latch plate 46 is rotatable with respect to the body 10 together with the operation handle 41 by the handle shaft 42. The leg pieces 48a of the contactor link 48 inserted through the handle link 45 are latch plates 46a. Guide hole 46
The swing range of the latch plate 46 with respect to the operation handle 41 is regulated by being inserted through d and by the handle link 45 being pivotally supported by the shaft protrusion 41d of the operation handle 41. Further, the lower edge of the locking piece 46a of the latch plate 46 can be engaged with the hooking groove 44e provided in the trip plate 44, and the movement of the latch plate 46 is prohibited in the engaged state.

As described above, the opening / closing device 40 constituted by the operating handle 41, the handle shaft 42, the handle return spring 43, the trip plate 44, the handle link 45, the latch link 46, the shaft pin 47, and the contact link 48, Contact point 3
When an excessive current passes through the main circuit in the closed state of 0x, the electromagnetic release device 50 or the thermal release device 60 operates to open the contact portion 30x.

The electromagnetic release device 50 is provided with a yoke 52 formed of a magnetic material in a substantially U shape opened upward, and the coil 51 is housed in the inner space of the yoke 52. That is, the yoke 52 includes a pair of side pieces 52 a and 52 b facing both end surfaces of the coil 51 in the axial direction, and the coil 51.
And an intermediate piece 52c that connects between the two side pieces 52a and 52b. In addition, each side piece 52a, 52
Holding grooves 52d and 52e that are open to the side are formed in b. The coil 51 is a cylindrical coil tube 5 made of an insulating material.
3 is wound around the outer circumference of the coil cylinder 53, and a flange 53a is integrally formed at one axial end of the coil tube 53,
A tapered portion 53b having an inner diameter and an outer diameter that are smaller than an axial middle portion is formed at the other end portion of the coil tube 53 in the axial direction.

A tapered portion 53b is provided in the inner space of the coil tube 53.
A movable iron core 54 having a portion having a diameter larger than the inner diameter of the coil barrel 53 is installed so as to be movable in the axial direction of the coil barrel 53, and the movable iron core 54 is attached to the end of the coil barrel 53 on the flange 53a side. The fixed iron core 55 facing the coil coil 5 partially
The coil tube 53 is attached to the coil tube 53 so as to protrude from the coil tube 3. A hooking pin 54a is integrally provided on one end surface in the moving direction of the movable iron core 54 so as to project from the end surface of the coil cylinder 53 on the side of the tapered portion 53b.
One ends of the pressing pins 57 projecting from the end surface on the flange 53a side face each other. A hooking head 54b having a larger diameter than other parts is formed at the tip of the hooking pin 54a. A return spring 56 composed of a coil spring is interposed between the movable iron core 54 and the fixed iron core 55, and the movable iron core 54 is urged toward the tapered portion 53 a of the coil tube 53 by the spring force of the return spring 56. Has been done.

Both ends in the moving direction of the movable iron core 54 are formed to have a smaller diameter than the middle part, one end serves as a spring receiving portion 54c to be inserted into the return spring 56, and the other end is a tapered portion 53b of the coil cylinder 53. Is formed so that it can be inserted into the inside of the taper, and the intermediate portion has a diameter larger than the inside diameter of the tapered portion. That is, the retaining step 54d is formed between the small diameter portion and the large diameter portion of the movable iron core 54 where the hooking pin 54a is provided so as to project,
The movable iron core 54 is prevented from falling off by locking the retaining step portion 54d on the step portion formed between the intermediate portion and the tapered portion 53b on the inner circumference of the coil tube 53.

The fixed iron core 55 has one end portion, which is closer to the movable iron core 53 in the axial direction of the coil cylinder 53, formed to have a smaller diameter than the other portions and is inserted into the return spring 56.
The outer flange 55b having a diameter larger than those of the other parts is formed at the other end. Further, a coupling protrusion 55c is provided at the center of the other end. However, if the fixed iron core 55 is inserted into the flange 53a side of the coil cylinder 53, the outer flange piece 55c abuts on the end surface of the coil cylinder 53, and the coupling protrusion 55c is formed.
Will project from the coil tube 53. The pressing pin 57 has an insertion hole 55d that penetrates the fixed iron core 55 in the axial direction.
By being inserted into the coil cylinder 53, the coil cylinder 53 projects from the coil cylinder 53.

A movable iron core 54 and a fixed iron core 5 are attached to the coil tube 53.
5, the core member formed by mounting the return spring 56 fits the tapered portion 53b of the coil tube 53 into the holding groove 52d provided in the side piece 52a of the yoke 52, and the coupling projection 5 of the fixed iron core 55.
The 5c is fitted into the holding groove 52e provided in the side piece 52b, and is attached to the yoke 52. Here, since the flange 53a of the coil cylinder 53 is interposed between the coil 51 and the side piece 52b of the yoke 52,
Insulation is secured between the coil 51 and the side piece 52b of the yoke 52. In addition, the coupling protrusion 55c has the yoke 5
The second brim piece 52b is fitted in the holding groove 52e provided on the second side piece 52b.
The fixed iron core 55 is magnetically coupled to the yoke 52 by being sandwiched between the fixed iron core 55 and the yoke 2b.

Electromagnetic release device 50 constructed as described above.
Are holding projections 17a, 17 protruding from the inner surface of the body 10a with respect to the holding grooves 52d, 52e formed in the yoke 52.
By inserting b, the body 10a is fixed at a fixed position. Further, the yoke 52 is also fixed to the body 10a by fitting the side portions of the yoke 51 into the yoke mounting grooves 18 formed on the inner surface of the body 10a. When the yoke 52 is fixed to the body 10a, the tapered portion 53b of the coil tube 53 and the fixed iron core 5 are provided.
The coupling projections 55c of No. 5 are holding grooves 52d and 52e, respectively.
The coil tube 53 is sandwiched between the inner peripheral edge of the coil and the tip edges of the holding projections 17a and 17b, and the coil cylinder 53 is fixed at a fixed position with respect to the yoke 52.

In the electromagnetic release device 50 having the above-described structure, when the coil 51 is energized, it is fixed to the movable iron core 54 so as to reduce the magnetic resistance of the magnetic path passing through the fixed iron core 55-yoke 52-movable iron core 54. If an attractive force acts on the iron core 55 and the passing current to the coil 51 is an excessive current such as when the load is short-circuited, the spring force of the return spring 56 is applied to move the movable iron core. 54 is moved so as to approach the fixed iron core 55. Therefore, when operated in this way, the switchgear 4
By operating 0, the contact part 30 in the closed state can be forcibly opened, and is connected to the switchgear 40 as follows.

That is, the tip of the hooking pin 54a provided on the movable iron core 54 has the shaft hole 33 in the movable contact 33x.
When the movable iron core 54 is attracted by the excitation of the coil 51 so that the movable iron core 54 approaches the fixed iron core 55 by being inserted into the hooking hole 33e formed between the a and the movable contact 32x, Hooking head 54 provided at the tip
b is locked to the peripheral portion of the hooking hole 33e to move the movable contact 33x.
Is pulled in a direction in which it is pulled away from the fixed contact 31x. Here, the hooking hole 33e is formed in the shape of a bear by connecting a locking hole having a diameter smaller than that of the hooking head 54b and an introduction hole having a diameter larger than that of the hooking head 54b. The electromagnetic release device 50 can be easily coupled to the movable contact 33x by introducing the hooking pin 54a into the locking hole after passing through. In addition, the pressing pin 57 fixed to the movable iron core 54
The tip (left end in FIG. 3) of the second pressing piece 4 of the trip plate 44.
4c, the movable iron core 54 is attracted by the fixed iron core 55 to move, and the tripping plate 44 is moved to the shaft pin 4
Around 7 is rotated clockwise in FIG.

On the other hand, the thermal release device 60 is provided with the bimetal 61 as described above, one end of the bimetal 61 is fixed to the terminal plate 21b described later, and the other end is inserted in the bending direction of the bimetal 61. The adjusting screw 62 is screwed.
The adjusting screw 62 faces the first pressing piece 44b of the trip plate 44, and the bimetal 6 is caused by an excessive current passing through the main circuit.
When 1 is curved, the trip plate 44 is pushed by the tip of the adjusting screw 62, so that the trip plate 44 is moved to the shaft pin 47.
It is adapted to rotate clockwise around in FIG.

An adjusting window 63 is provided in the vicinity of the adjusting screw 62 screwed to the bimetal 61 on the voltage pole side peripheral wall of the body 10.
Is open. The adjustment window 63 is provided with an insertion portion 63a formed at the upper end portion so as to be wider than the other parts.
The upper edge is a guide surface 63b inclined downward toward the inside of the body 10. Further, on both sides of the adjusting window 63, a mounting groove 63c is formed, the upper end of which is continuous with the insertion portion 63a and the lower end of which extends to the lower end of the adjusting window 63. That is, the insertion portion 6 is provided on both side surfaces of the adjustment window 63 on the outer surface side of the body 10.
Guide rib 63 reaching the lower end of the adjustment window 63 leaving 3a
Since the guide rib 63e is formed on the inner surface side of the body 10 and extends over the entire length of the adjustment window 63, the mounting groove 63c is formed between the guide ribs 63d and 63e.
Is formed.

By the way, the degree of bending (operation sensitivity) of the bimetal 61 with respect to the passing current changes depending on the variation of the material of the bimetal 61 and the connecting position of the connecting wire 38x. In order to prevent variations in the passing current of the main circuit when the device 40 operates, the amount of protrusion of the adjusting screw 62 screwed into the bimetal 61 from the bimetal 61 to the trip plate 44 side is adjusted. Will be required. Therefore, after the assembly, the adjusting screw 62 is operated with the adjusting window 63 opened. On the other hand, since it is not necessary to operate the adjusting screw 62 after adjusting the adjusting screw 62 once, the flexible closing plate 64 is dropped into the mounting groove 63c through the insertion portion 63a, and the adjusting plate 64 is adjusted. The window 63 is closed to prevent the adjustment screw 62 from being inadvertently operated and foreign matter from entering the inside of the body 10. The closing plate 64 has a width of the adjustment window 63 (the mounting groove 63c).
The distance between the bottoms of the adjustment windows 63 is substantially equal to the height of the adjustment window 63 in the vertical direction. When the closing plate 64 is inserted into the adjusting window 63, the upper end of the closing plate 64 contacts the upper surface of the adjusting window 63 and the closing plate 64 cannot be removed.

A terminal plate 21 constituting the movable side terminal 20ax
The ax has a fixed contact plate 39x bent downward inside the body 10, and a fixed contact 31x is fixed to a lower end portion of the fixed contact plate 39x. The movable contact 32x provided on the movable contact 33x faces the fixed contact 31x. Further, in the fixed contact plate 39x, a part of the arc traveling plate 71 made of a conductive plate is overlapped with the surface of the fixed contact 31x protruding below the fixed contact 31x. Arc running board 71
Is provided with a vertical guide piece 71a that partially overlaps with the fixed contact plate 39x, and the lower end of the guide piece 71a extends along the bottom wall of the body 10 via an inclined piece 71b that inclines obliquely downward. Arc extinguishing piece 7 extended below the intermediate piece 52c
Continue to 1c. Here, the arc extinguishing grid 72 is arranged between the opposing portions of the intermediate piece 52c of the yoke 52 and the arc extinguishing piece 71c. The arc-extinguishing grid 72 has a configuration in which a plurality of arc-extinguishing plates 74 made of a conductive plate are held inside a substantially U-shaped support plate 73 made of an insulating material. A cutout portion 74a into which the lower end portion of the movable contact 33 is introduced is formed. The arc extinguishing grid 72 is arranged such that the arc extinguishing plate 74 is substantially parallel to the intermediate piece 52b of the yoke 52 and the arc extinguishing piece 71c of the arc traveling plate 71. The arc extinguishing piece 71c of the arc traveling plate 71 is an inclined piece 71b.
It is formed in a shape in which the width gradually increases as it is separated from.

However, when the movable contact 32 separates from the fixed contact 31 and an arc is generated, a magnetic field generated around by a current flowing through the terminal plate 21a and the movable contact 33,
The arc moves downward in FIG. 3 due to the electromagnetic force generated by the current flowing through the arc, and one end of the arc rides on the arc traveling plate 71 and approaches the arc extinguishing grid 72. That is, the fixed contact plate 39x provided on the terminal plate 21a faces the movable contactor 33x, and current flows in opposite directions between the fixed contact plate 39x and the movable contactor 33x. An electromagnetic force in a direction of separating from the movable contact 33x acts.
As a result, one end of the arc on the fixed contact plate 39x side moves to the arc traveling plate 71 to travel, and the arc extinguishing grid 7
You will be led to 2. In addition, the movable contact 3
Since the arc traveling piece 33d is formed on 3x, the other end of the arc travels toward the tip of the arc traveling piece 33d. In this way, the arc will be gradually guided to and extended by the arc-extinguishing grid 72.

By the way, the movable contact 33x and the coil 51
A part of the connection wire 37x connecting one end of the yoke 52 is welded to the side piece 52a of the yoke 52 closer to the contact portion 30x. Therefore, one end of the arc is the arc traveling plate 7
When the arc is guided along the arc-extinguishing grid 72, the other end of the arc moves from the arc traveling piece 33d of the movable contactor 33x to the intermediate piece 52b of the yoke 52, and the intermediate piece 52b of the yoke 52-the yoke. The current flows through the path of the side piece 52a-the connecting wire 37x-the coil 51. Since the direction of this current is opposite to the current flowing through the arc traveling plate 71, the intermediate piece 52c of the yoke 52 and the arc traveling plate 71 are opposite.
The magnetic field produced by the current flowing through the arc causes the arc to experience an electromagnetic force that is directed into the arc extinguishing grid 72. That is, the intermediate piece 52b of the yoke 52 can have both the function of forming a magnetic path in the electromagnetic release device 50 and the function of extinguishing the arc in cooperation with the arc traveling plate 71. Compared with the case of providing, the number of parts can be reduced, the structure can be simplified and the cost can be reduced.

As shown in FIGS. 1 and 2, the terminal plate 2 constituting the fixed-side terminal 20by arranged in the storage space on the ground electrode side.
The movable contact 33y is electrically connected to 1by via a connecting wire 38y made of a braided wire. The connecting wire 38y functions as a primary side of the zero-phase current transformer 92 by having an insulating coating and being inserted into the toroidal core 91. Also, FIG.
As shown in FIG. 2, the connection wire 38x having an insulating coating inserted from the voltage electrode side through the insertion hole 19a is also inserted into the toroidal core 91, and is wound around the toroidal core 91.
Both ends of the next winding are connected to the leakage detection circuit 90 (see FIG. 7). Here, a canopy 19b is provided on the upper edge of the insertion hole 19a so that the connection line 38x passing through the insertion hole 19a does not interfere with a portion arranged above the insertion hole 19a. The leakage detection circuit 90 includes the fixed side terminals 20bx,
Power is supplied from 20 by, and when a current of a specified value or more flows in the secondary winding, the electromagnet device 100 is excited as a leakage current or a ground fault current. The electromagnet device 100 interlocks with the switchgear 40 arranged on the voltage electrode side by the configuration described later, and when the electromagnet device 100 is excited, the switchgear 40 operates to open the contacts 30x and 30y. That is,
If no leakage occurs, the currents flowing through the connecting lines 38x and 38y are equal, so that the magnetic fields around the connecting lines 38x and 38y are canceled out, so that no current flows in the secondary winding of the zero-phase current transformer 92. Although it does not flow, the current flowing through both connection lines 38x, 38y becomes unbalanced due to the occurrence of leakage, and the current flows through the secondary winding of the zero-phase current transformer 92, and this current is detected by the leakage detection circuit 90. Then, the electromagnet device 100 is excited.

A test switch 93 is connected between the fixed terminals 20bx and 20by via connection lines 94a and 94b (see FIGS. 7 and 9), and the connection between the fixed terminals 20bx and the test switch 93 is established. The wire 94a is also inserted through the toroidal core 91. Therefore, when the test switch 93 is turned on, a current flows in the secondary winding of the zero-phase current transformer 92 to excite the electromagnet device 100, and the operation of the leakage detection circuit 90 can be confirmed. Leakage detection circuit 9
The circuit component forming 0 is mounted on the printed circuit board 95 arranged at the bottom of the storage space on the ground electrode side. The printed circuit board 95 is positioned by being inserted into a holding groove 111 (see FIG. 9) provided on the inner peripheral surfaces of the body 10a and the cover 10by.

The electromagnet device 100 is provided with a yoke 102 formed of a magnetic material in a substantially U shape opened downward.
The coil 101 is housed in the inner space of the yoke 102.
The yoke 102 is provided with a pair of side pieces 102a and 102b facing the axially opposite end surfaces of the coil 101, respectively, and an intermediate piece 102c which passes above the coil 101 and connects the side pieces 102a and 102b. . One side piece 1
A through hole 102d is formed in the center of 02a. In this yoke 102, a part of the side piece 102b and the center piece 102c is press-fitted into a mounting groove 112 provided on the inner peripheral surface of the body 10a, and the yoke 102 is sandwiched between the body 10a and the cover 10by. Fixed to. A pair of upper and lower bearing pieces 102e is formed on the side piece 102a.
A shaft portion 103a of the interlocking lever 103 is interposed between 2e. A shaft pin 104 is inserted through a bearing hole 102f formed in the bearing piece 102e and a shaft portion 103a of the interlocking lever 103, and the interlocking lever 103 is rotatably held with respect to the electromagnet device 100.

The coil 101 is wound around the outer circumference of a coil cylinder 105 made of an insulating material, flanges 105a are integrally formed at both axial ends of the coil cylinder 105, and the inner space of the coil cylinder 105 is made of a magnetic material. Naru plunger 106
One end of the coil cylinder 105 is inserted through the through hole 102d so as to be movable in the axial direction of the coil cylinder 105. Plunger 1
06 is the plunger main body 1 inserted in the coil tube 105.
06a, a hooking pin 106b protruding from one end surface of the plunger body 106a and having a diameter smaller than that of the plunger body 106a, and the hooking pin 1 at the tip of the hooking pin 106b.
The hook head 106c having a larger diameter than 06b is integrally formed. Hooking pin 106b
Is a hook slit 103 provided on the interlocking lever 103 at a portion between the plunger body 106a and the hook head 106c.
b. Here, the plunger 106 has a hooking pin 106b inserted into a hooking slit 103b of the interlocking lever 103, and the plunger body 106a and the hooking head 1
Since the diameter of 06c is larger than the width of the hook slit 103b, the plunger 106 does not fall off the interlocking lever 103.

The interlocking lever 103 is provided with a pressing piece 103 on the side opposite to the hook slit 103b with the shaft 103a interposed therebetween.
with c. The pressing piece 103c is inserted on the voltage electrode side through the insertion hole 19c formed above the insertion hole 19a, and faces the first pressing piece 44b of the trip plate 44 together with the adjusting screw 62 provided on the bimetal plate 61. That is, the interlocking lever 103 can actuate the opening / closing device 40 by pressing the trip plate 44 as with the bimetal plate 61. Hook slit 103 in the interlocking lever 103
A pressing protrusion 1 described later is provided above the portion where b is formed.
03d is projected.

By the way, the movable contactor 33y is disposed in the storage space on the ground electrode side in the same manner as on the voltage electrode side.
The movable contact 32y provided at one end of 3y is the movable side terminal 20.
A contact portion 30y is configured with the fixed contact 30y provided on ay. The movable contactor 33y is held by the movable body 121 formed of an insulating synthetic resin. The movable body 121 is
The upper end portion of FIG. 1 is rotatably supported by a shaft pin 122 supported between the body 10a and the cover 10by, and the ground electrode is connected to the ground electrode through a guide hole 16 (see FIG. 3) provided in the body 10a. The tip end portion of the leg piece 48b of the contactor link 48 inserted through the side is inserted into the lower end portion of the movable body 121. Therefore, as the leg piece 48b of the contactor link 48 moves within the range of the guide hole 16, the movable body 121 swings around the shaft pin 122 as a rotation center.

The movable contact 33y has a movable contact 3 at one end.
2y, a spring receiving piece 33by bent in a substantially L shape at the other end, and supporting projections 33f protruding from both side edges of a portion between the movable contact 32y and the spring receiving piece 33by. Is formed in. One end of the opening spring 34y made of a coil spring is elastically contacted with the spring receiving piece 33by, and the other end of the opening spring 34y is housed in a spring receiving recess 35y formed on the inner surface of the body 10a.

The movable body 121 is formed in a frame shape in which upper ends of a pair of side frames 121a are continuously and integrally connected by an upper frame 121b and lower ends thereof are continuously and integrally connected by a lower frame 121c.
The bearing hole 12 into which the shaft pin 122 is inserted is inserted into the upper frame 121b.
1d is formed, and a bearing hole 121f into which the leg piece 48b of the contactor link 48 is inserted is formed in the lower frame 121c. In the movable contactor 33y, the spring receiving piece 33by is inserted between the upper frame 121b and the lower frame 121c of the movable body 121, and the movable contact 121y is provided on the one surface of the movable body 121 below the supporting projection piece 33f. When the pressing piece 121g extended below the lower frame 121c comes into contact with the lower frame 121c, the pressing piece 121g is held by the movable body 121. Further, the support groove 12 into which the support protrusion 33f of the movable contact 33y is inserted into the movable body 121.
1h is also formed. A contact portion of the lower frame 121c of the movable body 121 with the movable contactor 33y is formed in an arc shape in cross section. Therefore, the movable contact 33y can swing with respect to the movable body 121, and the position of the movable contact 32y is regulated by the pressing piece 121g in the direction in which the movable contact 32y approaches the fixed contact 31y. Connection line 37y described above
Is connected to the spring receiving piece 33by of the movable contactor 33y through between the upper frame 121b and the lower frame 121c of the movable body 121. The position control protrusion 1 is provided on the upper frame 121b of the movable body 121.
21i are projected continuously and integrally. Position control protrusion 121i
The function of will be described later.

The side frame 12 on the voltage pole side of the movable body 121
1a includes a push-up protrusion 121j on the extension line of the lower frame 121c.
Is protruding. The push-up protrusion 121j has a shaft protrusion 1 protruding from the inner surface of the body 10a on the ground electrode side.
13 (see FIG. 9) is a substantially lever-shaped locking lever 13 pivotally supported
The pushing piece 131a, which is one side of No. 1, is placed. The locking piece 131b, which is the other piece of the locking lever 131, has a body 10a.
A return spring 132, which is a coil spring, is sandwiched between the spring seat piece 114 provided on the inner side surface of the ground pole side of the. The spring seat 114 is formed with a spring receiving recess 114a into which one end of the return spring 132 is inserted. A notch 131c for locking is formed at the tip of the locking piece 131b of the locking lever 131.

A display piece 133 slidably held in a slide groove 115 (see FIG. 9) formed on the inner peripheral surfaces of the body 10a and the cover 10by is arranged above the locking piece 131b of the locking lever 131. Set up. Display piece 133
Holds a push spring 134 formed of a coil spring between itself and the inner surface of the body 10a, and is biased to the left in FIG. 9 by the push spring 134. Further, on the lower surface of the display piece 133, the pressing protrusion 133a pressed by the upper end of the pressing protrusion 103d provided on the interlocking lever 103 and the locking lever 1 are provided.
Locking protrusion 13 that can be hooked in the locking notch 131c of 31
3b and 3b are projected. Further, on the upper surface of the display piece 133, a display area 133c in which characters are written or which is colored in a different color from other parts is formed. A display window 135 made of a transparent plate is attached to the body 10 above the display piece 133. The display area 133c of the display piece 133 has a display window 13
5 and a display area 133c is displayed on the display window 1
It slides to a non-display position that does not face 35.

The locking lever 131 positions the locking piece 131b below the locking projection 133b of the display piece 133 when the movable body 121 is positioned to bring the movable contact 32y into contact with the fixed contact 31y. In addition, the movable contact 3
When the movable body 121 is located at a position where 2y is separated from the fixed contact 31y, the spring force of the return spring 132 causes the locking piece 1 to move.
By pushing up 31b, the locking notch 131c is located at a position where it can be hooked on the locking projection 133b. In addition, the pressing protrusion 103d of the interlocking lever 103 presses the pressing protrusion 133a of the display piece 133 in accordance with the movement of the plunger 106 during the operation of the electromagnet device 100, thereby displaying against the spring force of the pressing spring 134. The piece 133 is slid toward the display position. Then, when the movable contact 32y is separated from the fixed contact 31y when the display piece 133 slides against the spring force of the push spring 134, the locking projection 133b is hooked on the locking notch 131c. Thus, the display piece 133 is held at the position where the push spring 134 is compressed. This position is the display position, and the display area 133c faces the display window 135.

By the way, the test switch 93 is a device body so that a pressing force can be applied to the pair of contactor plates 141, 142 and the flexible movable piece 142a provided on the one contactor plate 142. Push button 14 attached to 10
3 and 3. A holding protrusion 141a is provided on the side edge of the contact plate 141 so as to project therefrom.
The contact plate 141 is fixed at a fixed position of the body 10 by press-fitting 1a into a holding hole (not shown) provided in the protrusion 116 provided on the inner surface of the body 10a on the ground electrode side. Here, the contactor plate 141 is arranged in the vertical direction, and the upper edge thereof is located below the movable piece 142a of the contactor plate 142.

The contact plate 142 has a movable piece 142a and a fixed piece 142b, and the movable piece 142a and the fixed piece 142b.
Are formed integrally with the movable piece 142a on the fixed end side by the bridging piece 142c. The bridging piece 142c has a curved shape that is convex upward, and the contact piece 142 is fixed to the body 10 by press-fitting the bridging piece 142c into the holding hole 117 provided in the body 10a. Fixed piece 1
42b is mounted on a mounting table 118 projecting from the inner surface of the body 10a on the side of the grounding electrode, and the terminal piece 142d projecting on the side edge of the fixed piece 142b has a connecting wire 94b whose one end is connected to the leakage detection circuit 90. Are connected. Further, below the movable piece 142a, the position regulating projection 121i provided on the movable body 121 is located. The tip of the position regulating protrusion 121i has a movable contact 3
When 2y is in contact with the fixed contact 31y, it is located below the upper edge of the contact plate 141, and when the movable contact 32y is separated from the fixed contact 31y, it is located above the upper edge of the contact plate 141. The push button 143 is provided with a push protrusion 143a on the lower surface, and the lower end of the push protrusion 143a contacts the upper surface of the movable piece 142a. Here, the portion of the movable piece 142a that faces the above-described position regulating projection 121i is the push projection 143a.
The movable piece 142a is located between the portion that receives the pushing force from the contact piece 142a and the portion that contacts the contact plate 141. Therefore,
When the movable contact 32y is in contact with the fixed contact 31y, the movable piece 142a can be brought into contact with the contact plate 141 by applying a pressing force to the push button 143, and the test switch 93 is turned on. In addition, the movable contact 32y is the fixed contact 3
When it is separated from 1y, even if a pressing force is applied to the push button 143, the position regulating projection 121i prevents the movable piece 142a from moving downward, and the movable piece 142a is attached to the contact plate 1.
41 cannot be contacted. The push button 143 is housed in the button housing recess 119 provided on the upper surface of the body 10, and the step portions 143b formed on both side edges of the push button 143 are engaged with the retaining piece 119a protruding from the opening edge of the button housing recess 119. By stopping, the fall from the body 10 is prevented.

By the way, the movable terminals 20ax, 20ay
The fixed-side terminals 20bx and 20by are formed by bending a conductive sheet metal into a substantially rectangular cross-section, and a tightening screw 2 screwed into an upper piece of the terminal fitting 22.
3 and the terminal plate 21a that abuts the lower end of the tightening screw 23
x, 21ay, 21bx, 21by. The terminal fitting 22 is housed in the terminal housing chambers 24ax, 24ay, 24bx, 24by formed in the body 10 and having a rectangular cross section so as to be vertically movable. That is, the terminal accommodating chambers 24ax, 24ay, 24bx, 24by have a height dimension larger than that of the terminal fitting 22, and the terminal fitting 22 is prevented from rotating in the terminal accommodating chambers 24ax, 24ay, 24bx, 24by and is movable only in the vertical direction. Has become. The head portion of the tightening screw 23 is formed in a truncated cone shape whose upper portion has a smaller diameter than that of the lower portion.
A screw operation hole 25 having a diameter such that a part of the head of the tightening screw 23 can be inserted and the head of the tightening screw 23 does not pass through is formed in the upper walls of bx and 24by. The diameter of the upper part of the screw operation hole 25 is the tightening screw 2
The diameter of the lower portion of the screw operation hole 25 is set to be larger than the upper end of the head of the screw No. 3 and the lower end of the head of the tightening screw 23. Terminal boards 21ax, 21ay, 21b
The tip portions of x and 21by are exposed to the outer side surface of the body 10 and are bent upward, and the terminal plates 21ax, 21ay, and 21b are inserted into the fixing grooves 26 formed on the outer side surface of the body 10.
By engaging the fixing protrusions 21c formed at the tips of x and 21by, the terminal plates 21ax, 21ay and 21by
The vertical movement of the tips of bx and 21 by is prohibited.
Further, the terminal storage chambers 24ax, 24ay, 24bx, 2
Terminal storage chamber 24 that separates 4 by from the internal space of the body 10.
A terminal plate holding groove 27 for positioning the terminal plates 21ax, 21ay, 21bx, 21by is formed on the side walls of the ax, 24ay, 24bx, 24by, and one of the terminal plates 21ax, 21ay, 21bx, 21by is formed in the terminal plate holding groove 27. The terminal plates 21ax, 21a can also be obtained by inserting the parts.
Vertical movement of y, 21bx, 21by is prohibited. That is, the terminal boards 21ax, 21ay, 21bx, 21b
Since the vertical movement is prohibited on both sides of the portion of the y contacting the tightening screw 23, even if an external force acts from the tightening screw 23, the terminal plates 21ax, 21ay, 21bx, 2
1 by is fixed in place. put it here,
The distance between the terminal plates 21ax, 21ay, 21bx, 21by and the upper walls of the terminal storage chambers 24ax, 24ay, 24bx, 24by is set to be substantially equal to the length dimension of the tightening screw 23.

However, when the tip of a slotted screwdriver is inserted into the screw operating hole 25 and the tightening screw 23 is rotated, the terminal fitting 22 is rotated depending on the direction of rotation of the tightening screw 23.
Is moved up and down, the distance between the lower piece of the terminal fitting 22 and the terminal plates 21ax, 21ay, 21bx, 21by can be changed. That is, the terminal storage chamber 24a
x, 24ay, 24bx, 24by lower wall and terminal board 21
Insert a wiring member such as an electric wire or bus bar into the connection hole 28 penetrating the peripheral wall of the body 10 corresponding to the portion between ax, 21ay, 21bx, and 21by, and tighten the tightening screw 23. Rotate the lower piece of the terminal fitting 22 to the terminal board 21.
By bringing the wiring member close to ax, 21ay, 21bx, 21by, the wiring member is connected to the terminal fitting 22 and the terminal plates 21ax, 21a
It can be sandwiched between y, 21bx, and 21by to be electrically connected to the wiring member.

On the lower surface of the body 10, a mounting rail (so-called DIN rail) 80 arranged inside the distribution board or the like is provided.
An attachment device is provided for detachably fixing to (see FIG. 5). The mounting rail 80 has a shape in which a brim piece 80a is integrally projecting outwardly over the entire length at the tip edges of both leg pieces of the rail body formed in a substantially U-shaped cross section. Movable side terminals 20ax and 20ay are provided on the lower surface of the body 10.
A mounting groove 81 that runs in a direction orthogonal to the direction connecting the fixed terminal 20bx and the fixed side terminals 20bx and 20by is formed, and a mounting rail 80 is formed between one inner wall of the mounting groove 81 and the inner bottom surface of the mounting groove 81.
A locking projection 82 into which one of the collar pieces 80a is inserted is provided so as to project. A storage groove 83 is formed on the other side surface of the mounting groove 81 so as to pass through the outer surface of the body 10.
A slider 84 is attached to the unit 3.

As shown in FIG. 3, the slider 84 has an operating portion 84a whose one end projects from the outer surface of the body 10, and a connecting piece 84b extending from the operating portion 84a in the direction of the center line of the storage groove 83. A claw portion 84c integrally provided at the tip of the connecting piece 84b and protruding into the mounting groove 81, and a pair of bending pieces integrally extending from the operating portion 84a on both sides of the connecting piece 84b in parallel with the connecting piece 84b. And 84d are formed continuously and integrally by a synthetic resin. Positioning protrusions 84e are provided at the distal ends of the respective bending pieces 84d so as to separate from the connecting pieces 84b. Further, the positioning protrusion 84e
A V-shaped groove 84f is formed on the tip surface of the.

Although not shown, a positioning protrusion 84e is inserted into the inner surface of the storage groove 83, and a movement restricting recess having a width dimension in the center line direction of the storage groove 83 longer than that of the positioning protrusion 84e is formed. The slider 84 is slidable within the range of the movement regulation recess. Further, the claw portion 84c of the slider 84 is projected into the mounting groove 81 on the inner peripheral surface of the movement restricting recess so that the flange 80a of the mounting rail 80 is held between the inner bottom surface of the mounting groove 81 and the claw portion 84c. In this state, mountain protrusions that engage with the V-shaped groove 84f are formed.

According to the above construction, after one flange piece 80a of the mounting rail 80 is inserted between the inner bottom surface of the mounting groove 81 and the locking projection 82, the other flange piece 80a is mounted on the inner bottom surface of the mounting groove 81. When the slider 84 is pushed into the body 10 in a state of being abutted against, the other brim piece 80a of the mounting rail 80 is held between the inner bottom surface of the mounting groove 81 and the claw portion 84c. In this way, the body 10 can be fixed to the mounting rail 80. At this position, the mountain projections engage with the V-shaped groove 84f, and the movement of the slider 84 is prohibited.

On the other hand, in order to remove the body 10 from the mounting rail 80, the operating portion 84a projecting to the side surface of the body 10a.
By inserting the tip of a flat-blade screwdriver or the like into the insertion hole 84g provided in the slider 84 and pulling out the slider 84 from the body 10, the claw portion 84 with respect to the collar piece 80a of the mounting rail 80 can be obtained.
The engagement state of c is released, and the body 10 can be removed from the mounting rail 80.

Next, the operation of the circuit breaker will be described. FIG. 8 shows a closed state of the contact portion 30x on the voltage electrode side, in which the operating portion 41a of the operating handle 41 is tilted rightward in FIG. 8 around the handle shaft 42. At this time, the trip plate 44 is biased counterclockwise in FIG. 8 around the shaft pin 47 by the spring force of the handle return spring 43, and the first pressing piece 44b faces the tip of the adjusting screw 62 provided on the bimetal 61. It is kept in the state where it did. Further, the spring force of the opening spring 34x acts on the latch plate 46 via the movable contact 33x and the contact link 48, and the leg piece 48 of the contact link 48 is applied.
Since the distance between a and the shaft projection 41d provided on the operation handle 41 is restricted by the handle link 45, the latch plate 46 receives the spring force of the opening spring 34x and is attached counterclockwise about the handle shaft 42. Energized. Therefore, the locking piece 46a of the latch plate 46 engages with the locking groove 44e provided in the arm piece 44d of the trip plate 44.
That is, the latch plate 46 tries to rotate clockwise, but is prevented from rotating by the trip plate 44.
The state of is maintained. In this state, the latch plate 46
The position is fixed by the handle shaft 42 and the trip plate 44, and the handle link 45 and the contact link 48 are also fixed at fixed positions. As a result, the movable contact 33x is biased counterclockwise by the spring force of the opening spring 34x about the leg piece 48b of the contact link 48. That is, the movable contact 32x is the opening spring 34
The fixed contact 31x is contacted with a contact pressure corresponding to the spring force of x. In this state, the stopper 3 provided on the inner surface of the body 10
The positional relationship is set so that the spring receiving piece 33bx of the movable contact 33x does not come into contact with the position 6.

On the ground electrode side, the contact portion 30 on the voltage electrode side is provided.
When x is in the closed state, as shown in FIG. 9, the leg piece 48b of the contact link 48 is located at the left end of the guide hole 16, and the movable contact member 33y is pressed leftward by the movable body 121. The movable contact 32y contacts the fixed contact 31y. At this time, the movable contact 3 receives the spring force of the opening spring 34y.
The lower end of 3y receives the force toward the left in FIG. That is, the opening spring 34y causes contact pressure to act on the contact portion 30y. Thus, when the contact portion 30x is closed on the voltage electrode side, the contact portion 30y is closed on the ground electrode side.

On the other hand, as shown in FIG. 10, when the operating portion 41a of the operating handle 41 is tilted to the left in FIG. 10 around the handle shaft 42, the contact portion 30x is opened.
That is, by rotating the operation handle 41 counterclockwise around the handle shaft 42, the handle link 45
The upper end of the contact moves to the right, and the leg piece 4 of the contact link 48 is
8a is to be pulled upward. However, the shaft protrusion 41d is not aligned with the straight line connecting the handle shaft 42 and the leg piece 48a.
Is moved to the right, the spring force of the opening spring 34x acting on the handle link 45 via the movable contact 33 and the contact link 48 acts to further rotate the operation handle 41 counterclockwise. The leg piece 48b of the contact link 48 moves leftward along the guide hole 16. In this way, the leg pieces 48b of the contactor link 48 move leftward, so that the spring receiving piece 33b of the movable contactor 33x is moved.
x contacts the stopper 36 provided on the inner peripheral surface of the body 10 by the spring force of the opening spring 34x. here,
Since the spring force of the opening spring 34x acts below the lower end of the stopper 36, the movable contact 33x is urged clockwise and the movable contact 32 separates from the fixed contact 31. Further, when the contact portion 30x is in the open state, the latch plate 46 causes the handle link 45 and the leg piece 48 of the contact link 48.
It is restricted by a and rotates counterclockwise around the handle shaft 42, and comes off from the trip plate 44.

The contact portion 3 is operated by operating the operation handle 41.
When 0x is opened, the leg piece 48b of the contactor link 48 is connected to the guide hole 1 on the ground electrode side as shown in FIG.
By moving to the right end of 6, the lower end of the movable body 121 moves to the right. Therefore, the lower end portion of the movable contact 33y also moves to the right, and the movable contact 32y moves to the fixed contact 31y.
Move away from Here, the opening spring 34y biases the movable contact 33y in the clockwise direction in FIG. 11 centering on the contact portion with the lower frame 121c of the movable body 121, but with the pressing piece 121g provided on the movable body 121. Since the movement of the movable contact 33y is restricted, the movable contact 32y is fixed to the fixed contact 3
There is no contact with 1y.

By the way, in the closed state shown in FIGS. 8 and 9, when the overload state occurs and an excessive current flows in the bimetal 61 and the bimetal 61 bends, the first pressing piece 44b of the trip plate 44 is removed. The adjustment screw 62 screwed to the bimetal 61 is pressed. Further, when an excessive current flows through the coil 51 due to a short circuit on the load side and the movable iron core 54 is attracted to the fixed iron core 55, the second pressing piece 44c of the trip plate 44 is
Will be pressed by the pressing pin 57 that receives the force from the movable iron core 54. Alternatively, when a leakage occurs on the load side, a current flows through the secondary winding of the zero-phase current transformer 92, the electromagnet device 100 is excited through the leakage detection circuit 90, and the plunger 106 is pulled into the coil 101. Since the interlocking lever 103 rotates around the shaft pin 104,
As indicated by the broken line in FIG. 14, the first pressing piece 44b is pressed by the pressing piece 103c of the interlocking lever 103. In either case, the trip plate 44 rotates clockwise around the shaft pin 47 as shown in FIG.

When the trip plate 44 rotates clockwise in FIG. 12, the engagement with the latch plate 46 is released. In the closed state, the latch plate 46 applies the spring force of the opening spring 34x. Since it is received and biased clockwise around the handle shaft 42, the lower end of the latch plate 46 moves to the left. That is, the leg piece 48 of the contactor link 48, which was the center of rotation of the movable contactor 33x in the closed state.
Since b moves leftward in FIG. 12 along the guide hole 16, the movable contact 33x is pressed against the stopper 36 by the spring force of the opening spring 34x and moved in the same manner as in the opening state shown in FIG. The contact point 32x is separated from the fixed contact point 31x to be in an open state. That is, when an excessive current flows in the main circuit, the trip plate 44 rotates and the engagement state with the latch plate 46 is released, and the force that biases the latch plate 46 is released. The contact portion 30x is opened by performing a so-called trip operation. By tripping, trip plate 44 and latch plate 46
When the contact handle 30x is opened by disengagement with the contact handle 30x, the operation handle 41 can freely rotate around the handle shaft 42. Therefore, the spring force of the handle return spring 43 causes the operation handle 41 to move to the off position (see FIG. Position 10). At this time, the electromagnetic release device 50, the thermal release device 60, and the electromagnet device 100 are all returned to their original state by opening the contact portion 30x, so that the operation handle 41 is operated to turn off immediately after the trip operation. It will return to the same state as when it was turned on.

When the contact portion 30x is opened by the trip operation, as shown in FIG. 13, the leg piece 48b of the contact link 48 on the ground electrode side is the same as when the contact portion 30x is opened by the operation handle 41. Moveable body 121
Is moved to separate the movable contact 32y from the fixed contact 31y. That is, on the ground electrode side, if the contact portion 30x on the voltage electrode side is opened by the trip operation, the contact portion 30y works in tandem.
Open the contact.

By the way, contact points 30x, 30
When y is opened, it is dangerous unless the leakage point is removed and then returned. Therefore, the contact portion 30 is caused by an electric leakage.
When x and 30y are opened, the plunger 106 moves to the coil 1
The interlocking lever 103 rotates as it is pulled in 01, and the pressing protrusion 133a of the interlocking lever 103 pushes the pressing protrusion 133a of the display piece 133 against the spring force of the pressing spring 134. That is, the display piece 133 slides so that the display area 133c coincides with the display window 135.
Here, the movable body 121 is arranged so as to open the contact portion 30y.
13 has moved to the right in FIG. 13, the pusher piece 131a of the locking lever 131 moves the push-up protrusion 1 of the movable body 121.
21j moves downward with the movement of 21j, and the locking piece 131b moves upward due to the spring force of the return spring 132. As a result, the locking notch 131c of the locking lever 131 is caught by the locking projection 133b of the display piece 133, and the display piece 133 is displayed.
Is held at a display position where the display area 133c matches the display window 135. In this way, when the trip operation is performed due to the electric leakage, it is displayed by the display piece 133, and the display state is held until the contact portions 30x and 30y are closed by the next operation of the operation handle 41. Here, when the leakage is not detected, the interlocking lever 103
Receives the spring force from the push spring 134 via the display piece 133 and keeps the plunger 106 at the position where it is projected from the coil 101. At this time, the plunger body 10
6a is separated from the side piece 102b of the yoke 102. When the leakage is detected, the plunger 106 is drawn into the coil 101 by the suction force acting between the side piece 102b of the yoke 102 and the plunger body 106a.

The test switch 93 is provided with the leakage detection circuit 90.
It is provided to test the operation of the. That is, when the contact portions 30x and 30y are closed, the push button 143 is
By pressing, as shown in FIG.
When the movable piece 142b of the contactor plate 142 is brought into contact with No. 1, a current is caused to flow through the connection line 94a and a current is caused to flow through the secondary winding of the zero-phase current transformer 92, and a phenomenon similar to leakage is simulated. It is happening. After the contacts 30x and 30y are opened, in order to always turn off the test switch 93, as shown in FIG. 13, the position control projection 121i provided on the movable body 121 pushes up the movable piece 142a to push it up.
Even if 3 is pressed, the movable piece 142a cannot contact the contact plate 141. That is, the movable side terminal 20b
When x and 20 by are set to the power source side, the power source side is short-circuited by turning on the test switch 93. Therefore, after the trip operation, the test switch 93 is forcibly turned off by the position regulating projection 121i, and the push button 143 is pressed.
Even if you keep pressing, the short-circuit state will not continue. In particular, since the position regulating projection 121i is brought into contact with the movable piece 142a between the position where the movable piece 142a contacts the contact piece 141 and the position where the pressing force from the push button 143 acts, the position regulating projection 121i is cut off when the main electric path is cut off. If the positional relationship is ensured so that the tip end of 121i protrudes above the upper end of the contact piece 141, the movable piece 142a can be reliably separated from the contact piece 141 even when the pressing force from the push button 143 is large. You can do it.

[0058]

According to the present invention, the contact position of the movable piece with the contact plate is located closer to the tip end side of the movable piece than the position where the pressing force from the push button acts, and the action of the pushing force by the position regulating projection piece. Since the point is located between the contact position on the movable piece with the contact plate and the position where the pushing force from the push button acts, the main electric circuit is interrupted by the detection of the leakage and the position regulation protrusion allows the movable piece to move against the movable piece. When a pressing force in the direction of separating the contact plate from the contact plate is applied, the part of the movable piece facing the contact plate located on the tip side of the part receiving the pressing force from the position control projection is reliably separated from the contact plate. The effect is that you can. Further, in this configuration, the stronger the pressing force from the push button, the greater the distance from the contact plate of the movable piece, so it is possible to reliably prevent the test switch from continuing to be in the ON state after the main electric circuit is cut off. There is an advantage.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a ground electrode side in an embodiment.

FIG. 2 is a perspective view showing a state in which a ground electrode side cover is removed in the embodiment.

FIG. 3 is an exploded perspective view of a voltage electrode side in the example.

FIG. 4 is a perspective view showing a state in which a cover on the voltage electrode side is removed in the embodiment.

FIG. 5 is an external perspective view showing an example.

FIG. 6 is a cross-sectional view showing an example.

FIG. 7 is a circuit diagram of an example.

FIG. 8 is a side view showing a closed electrode state of the embodiment with a cover on the voltage electrode side removed.

FIG. 9 is a side view showing a closed electrode state of the embodiment with a ground electrode side cover removed.

FIG. 10 is a side view with the cover on the voltage electrode side removed, showing the opened state of the embodiment.

FIG. 11 is a side view showing an open state of the embodiment with a cover on the ground electrode side removed.

FIG. 12 is a side view showing a trip state of the embodiment with a cover on the voltage electrode side removed.

FIG. 13 is a side view showing the trip state of the embodiment with the cover on the ground electrode side removed.

FIG. 14 is a horizontal sectional view of an essential part of the embodiment.

FIG. 15 is a side view of an essential part showing a closed electrode state of the embodiment with a ground electrode side cover removed.

[Explanation of symbols]

 33x Movable contactor 33y Movable contactor 40 Switchgear 92 Zero-phase current transformer 93 Test switch 100 Electromagnet device 103 Interlocking lever 121 Movable body 121i Position regulating projection 141 Contactor plate 142a Movable piece

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tomoyuki Sawada 1048, Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Works Co., Ltd. (72) Hiroshi Konishi, 1048, Kadoma, Kadoma City, Osaka Matsushita Electric Co., Ltd.

Claims (1)

[Claims] 1. A zero-phase current transformer having a main electric path between a power source and a load as a primary side, and a secondary output of the zero-phase current transformer when an imbalance occurs in a passing current of the main electric path. An earth leakage breaker that operates to open the movable contactor to disconnect the main circuit, and a test switch operated so that a pseudo unbalanced current flows in the primary side of the zero-phase current transformer. In the provided earth leakage breaker, the test switch includes a flexible movable piece that receives a pressing force from the push button, and a contact plate that constitutes a contact facing a part of the movable piece. The contact piece is provided with a position regulating projection that presses the movable piece in a direction of pulling the movable piece away from the contact piece plate when the child is driven to open, and the contact position of the movable piece with the contact piece plate is more than that of the movable piece. The contact point on the movable piece is located on the tip side and the point of application of the pushing force by the position control projection An earth leakage circuit breaker, which is located between a contact position with a plate and a position where a pressing force from a push button acts.