JP3210819B2 - Earth leakage breaker - Google Patents

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 interrupting a main circuit when a leakage current or a ground fault current flows in a main circuit between a power supply and a load.

[0002]

2. Description of the Related Art Generally, this type of earth leakage circuit breaker is disclosed in Japanese Patent Publication No. 57-5015 and the like.
A display piece is provided to indicate that the main circuit has been interrupted by detecting leakage. The display piece is movable between the display position and the non-display position, is spring-biased toward the display position, and resists the spring force so as to maintain the non-display position until an electric leakage is detected. Is locked. Therefore, the display piece is released from the locked state by the detection of the electric leakage, and moves to the display position by the spring force.

[0003]

In the above configuration, the spring force for urging the display piece in a state where the electric leakage is not detected is accumulated, and when the electric leakage is detected, the spring force is released and the display piece is released. Is moved, so when an external force such as vibration or impact acts to release the locked state of the display piece,
There is a risk that the display piece may move to the display position even though no electric leakage has been detected. Further, in the above configuration, means for returning the display piece to the non-display position is required,
The number of parts will increase.

The present invention has been made in view of the above circumstances, and an object of the present invention is to improve the above-mentioned conventional configuration to eliminate the possibility of erroneous display and reduce the number of components. Is to provide.

[0005]

According to a first aspect of the present invention, there is provided a zero-phase current transformer having a main circuit between a power supply and a load as a primary side, and an unbalanced current flowing through the main circuit. Of zero-phase current transformer 2
An electromagnet device that operates by the next output, a switchgear that cuts off the main electric circuit by opening the movable contact in response to the operation of the electromagnet device, and a display position and non-display to display the operation of the electromagnet device In the earth leakage breaker provided with a display piece movable to and from a position, a push spring for urging the display piece toward the non-display position, and a push spring for pushing the display piece in conjunction with the operation of the electromagnet device. Substantially equipped with an interlocking lever that moves to the display side against the spring force , a pushing piece and a locking piece
The locking lever and the locking piece that are
A return spring that pushes the movable piece to a position where it can be hooked on the indicator piece, and the movable contact is driven to open by the opening and closing device , and the pushing piece is
The locking piece is hooked on the display piece by moving with the movement
Linked to the operation of the electromagnet device when
Is engaging piece when the display piece positioned in the display position, characterized in that to hold the display position against the spring force of the spring pressing the display piece Te.

According to a second aspect of the present invention, the electromagnet device is provided with a plunger that can move forward and backward, and is rotatably supported at a fixed position. It is characterized by linking with a piece.

[0007]

According to the structure of the first aspect of the present invention, the display piece is urged toward the non-display position by the pressing spring, and the pressing spring does not accumulate the spring force in the non-display position. Even if the external force is applied, the display piece does not move to the display position, and erroneous display can be reliably prevented. In particular, in the case of an earth leakage breaker that also has the function of detecting an overload or short circuit and shutting off the main circuit, the operation of the switchgear during overload or short circuit causes vibration or impact. By adopting the configuration of the first aspect of the present invention, it is possible to clearly distinguish between interruption due to electric leakage and interruption due to overload or short circuit. In addition, since the display piece is locked in a state where the spring force is accumulated in the push spring when the main electric circuit is cut off due to the electric leakage, the display piece can be returned to the non-display position only by releasing the lock.
As a result, the number of parts can be reduced as compared with the conventional configuration.

According to the configuration of the second aspect of the present invention, the first aspect is provided.
In addition to the operation of the invention, the use of a plunger in the electromagnet device enables a large attractive force to be obtained even with a small size, and the interlocking lever is a rotating operation with little influence of friction. Even though a small electromagnet device is used, a large force can be applied to the display piece from the electromagnet device, and it is possible to surely perform the interruption of the main electric circuit and the display of the electric leakage when the electric leakage is detected.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIGS. 1 to 6, a container 10 made of an insulating synthetic resin is provided.
a and a pair of covers 10bx and 10by that are respectively covered on both sides of the body 10a by rivets 11 (see FIG. 5).
And formed by bonding. That is, assembling holes 12a, 12bx, and 12by are provided at four locations on the periphery of the body 10a and the covers 10bx and 10by, and the rivets 11 are passed through the assembling holes 12a, 12bx, and 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 space 30x inserted into a voltage line is stored in the storage space between the body 10a and the cover 10bx. 10by
And a contact portion 30y inserted into the ground line
Is stored. Hereinafter, the cover 10bx side is the voltage pole side with respect to the body 10a, and the cover 1 is
The 0by side is called a ground pole side.

A pair of movable terminals 20ax, 20ay and fixed terminals 20bx, 2
0 by is provided. Movable terminals 20ax, 20ay
Are electrically connected to terminal plates 21ax and 21ay having fixed contacts 31x and 31y (see FIGS. 1 and 3). Here, the configuration on the voltage pole side will be described first. The fixed terminal 20bx of the voltage side electrode is electrically connected to a terminal plate 21bx to which one end of a bimetal 61 constituting the thermal release device 60 is fixed. The fixed contact 31x is a movable contact 33.
A contact portion 30x is formed together with a movable contact 32x provided at x, and the movable contact 33x contacts and separates from 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 the electromagnetic release device 50 to be described later via a connecting wire 37x made of a braided wire, and the other end of the coil 51 is connected to the middle of the bimetal 61 via a connecting wire 38x made of a braided wire. Connected to the unit. 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, the coil 51, the bimetal 61, and the fixed terminal 20bx. The intermediate portion of the connection line 38x is inserted into the storage space on the ground electrode side through an insertion hole 19a provided in the body 10a. This configuration will be described later. As the bimetal 61, either a direct heat type in which the sheet is bent by self-heating or an indirectly heated type in which a plate-shaped heater is stacked and bent by heating by the heater can be used.

On the upper surface of the body 10, there is formed a handle insertion hole 13 which opens in a rectangular shape when the body 10a and the cover 10bx abut each other, and as shown in FIG. 3, the inner surface of the body 10a and the cover 10bx. A cylindrical bearing 14 protrudes near the handle insertion hole 13. Each end of a handle shaft 42 that supports the operation handle 41 is inserted into a bearing hole 14 a that opens in the center of the bearing 14. The operation handle 41 is provided with an operation portion 41 a protruding from the handle insertion hole 13 to the upper surface of the body 10. In other words, the operating handle 41 has a handle shaft 42 within a range in which the operating portion 41a can move in the handle insertion hole 13.
Can be turned around. Operation unit 4 of operation handle 41
An arc-shaped cover piece 41b centering on the handle shaft 42 is formed at the base of 1a, and the periphery of the handle insertion hole 13 in the body 10 bulges outward along the cover piece 41b. The covering piece 41b is in sliding contact with the inner side surface of the container 10, so that even if the operation handle 41 rotates, the covering piece 41b
Thus, the inside of the body 1 is shielded so as not to be seen, and characters indicating the opening and closing of the contact portion 30x with the operation of the operation handle 41 are written on the cover piece 41b. A link support portion 41c protrudes from a lower surface of the cover piece 41b, and a shaft protrusion 41d protrudes from both lower side surfaces of the link support portion 41c. Here, the operation unit 41a and the link support unit 41c are
The covering piece 41 is not in a straight line but has a substantially rectangular cross section.
The projecting directions with respect to b are set. further,
The operation handle 41 is urged counterclockwise in FIG. 3 by a handle return spring 43 composed of a scissors-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 covering piece 41b in FIG.
4 locked.

The opening / closing device 40 includes a handle link 45 into which a shaft projection 41d provided on the operation handle 41 is inserted into a bearing hole 45a formed at the tip of each leg, and a flat plate-like shape. Locking plates 46a at both ends of the locking plate 46a
The latch plate 46 is provided with a pair of guide pieces 46b extending substantially in a direction substantially perpendicular to the locking plate 46a and along the edge of the locking plate 46a, and the handle shaft 42 is inserted into a shaft hole 46c formed at the tip end of the guide piece 46b. And the body 10 inserted through the tripping plate 44
The shaft pins 4 are inserted into bearing holes 15a formed in bearings 15 formed on inner surfaces of the cover 10bx and the inner surface of the cover 10bx, respectively, and rotatably support the tripping plate 44 with respect to the body 10.
7, and one leg piece 48a is substantially U-shaped and the other leg piece 4
And a metal contact link 48 formed longer than 8b. The one leg piece 48a of the contact link 48 is inserted through a guide hole 46d formed in both guide pieces 46b of the latch plate 46 into a link hole 45b provided at the base of both leg pieces of the handle link 45. The other leg piece 48b is provided with a shaft hole 33 provided in the movable contact 33.
a. Here, an arc-shaped curved guide hole 16 which is convex downward in FIG. 3 is formed on the inner side surface of the body 10a, and the tip end of the leg piece 48b of the contact link 48 is inserted into the guide hole 16. Accordingly, the moving 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, a spring receiving piece 33bx at the other end, and a shaft hole 3 into which the leg piece 48b of the contact link 48 is inserted between the movable contact 32x and the spring receiving piece 33bx.
It is formed in a shape having a bearing piece 33c having an opening 3a. Here, a movable contact 33x formed of a plate material
Is bent into a substantially L shape and its corner is used as a movable contact 32x.
The arc traveling piece 33d is extended to the tip side from 2x. A spring seat (not shown) that is inserted into one end of an opening spring 34x formed of a coil spring projects from the spring receiving piece 33bx. The other end of the opening spring 34x is connected to a spring receiving recess 35x formed on the inner surface of the body 10a.
It is stored in. On the inner surface of the body 10a, a stopper 36 protrudes in a plane substantially parallel to the opening surface of the spring receiving recess 35x, and the body 10a in which the spring receiving recess 35x is formed.
a spring receiving piece 3 in the space between the inner surface of
3bx is partially inserted, and the spring receiving piece 33bx is urged toward the stopper 36 by the spring force of the opening spring 34x.

The tripping plate 44 has a first pressing piece 44b protruding from an upper end of the base piece 44a to one side and a base piece 4a.
The second pressing piece 44c is extended downward from 4a,
Further, an arm piece 44d is formed to protrude 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 tripping plate 44 is rotatable around the shaft pin 47. A hook groove 44e is formed at the upper edge of the tip of the arm piece 44d, and the upper edge of the arm piece 44d is inclined further closer to the distal end than the hook groove 44e so that the distance from the lower edge is reduced. A locking recess 44f is formed in a side edge of the base piece 44a and is opened to the side and cut upward, and one end of the handle return spring 43 is locked in the locking recess 44f. As a result, the trip plate 44 is urged 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 piece 48a of the contact link 48 inserted through the handle link 45 Guide hole 46
The swing range of the latch plate 46 with respect to the operation handle 41 is regulated by the handle link 45 being inserted into the operation handle 41 and being supported by the shaft projection 41 d of the operation handle 41. The lower edge of the locking piece 46a of the latch plate 46 is engageable with a hook groove 44e provided on the tripping plate 44. In the engaged state, the movement of the latch plate 46 is prohibited.

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 part 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 has a yoke 52 formed of a magnetic material in a substantially U shape opened upward, and the coil 51 is housed in the space inside the yoke 52. That is, the yoke 52 includes a pair of side pieces 52a and 52b facing the axial end faces of the coil 51, respectively.
And an intermediate piece 52c that passes underneath and joins between the two pieces 52a, 52b. Each side piece 52a, 52
In b, holding grooves 52d and 52e that open sideways are formed. The coil 51 is a cylindrical coil cylinder 5 made of an insulating material.
3, and is integrally formed with a flange 53a at one axial end of the coil cylinder 53,
A tapered portion 53b is formed at the other end of the coil cylinder 53 in the axial direction so that both the inner and outer diameters are smaller than the intermediate portion in the axial direction.

A tapered portion 53b is provided in the inner space of the coil cylinder 53.
The movable iron core 54 having a portion having a diameter larger than the inner diameter of the coil cylinder 53 is provided so as to be movable in the axial direction of the coil cylinder 53, and the movable iron core 54 is provided at the end of the coil cylinder 53 on the flange 53 a side. The fixed iron core 55 facing the part of the coil cylinder 5
3 and is mounted on the coil cylinder 53 in a form projecting therefrom. On one end surface of the movable iron core 54 in the moving direction, a hooking pin 54a projecting from the end surface on the tapered portion 53b side of the coil cylinder 53 is integrally provided.
One end of the pressing pin 57 protruding from the end surface on the side of the flange 53a is opposed. A hook head 54b is formed at the tip of the hook pin 54a and has a diameter larger than that of the other portions. 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 cylinder 53 by the spring force of the return spring 56. Have been.

Both ends in the moving direction of the movable iron core 54 are formed to have a smaller diameter than the intermediate portion, and one end is a spring receiving portion 54c inserted into the return spring 56, and the other end is a tapered portion 53b of the coil cylinder 53. The intermediate portion is formed to have a larger diameter than the inner diameter of the tapered portion. That is, a 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 protrudes,
The movable iron core 54 is prevented from falling off by engaging the retaining step 54d with a step formed between the intermediate portion and the tapered portion 53b on the inner periphery of the coil cylinder 53.

The fixed iron core 55 is formed such that one end near the movable iron core 53 in the axial direction of the coil cylinder 53 is formed to have a smaller diameter than the other part, and is inserted into the return spring 56.
The outer flange piece 55b having a larger diameter than other parts is formed at the other end. Further, a coupling projection 55c is protruded from the center of the other end. However, when 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 face of the coil cylinder 53, and the coupling protrusion 55c
Project from the coil cylinder 53. The pressing pin 57 has an insertion hole 55 d penetrating in the axial direction of the fixed iron core 55.
Through the coil tube 53.

A movable iron core 54 and a fixed iron core 5 are
5. The core member formed by mounting the return spring 56 has the tapered portion 53b of the coil cylinder 53 fitted 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 is formed.
5c is attached to the yoke 52 by fitting it into a holding groove 52e provided in the side piece 52b. Here, the flange 53a of the coil cylinder 53 is interposed between the coil 51 and the side piece 52b of the yoke 52,
Insulation between the coil 51 and the side piece 52b of the yoke 52 is ensured. Also, the coupling projection 55c is
The outer flange piece 55b is fitted into the holding groove 52e provided in the second side piece 52b, and the outer flange piece 55b is
2b, the fixed iron core 55 is magnetically coupled to the yoke 52.

The electromagnetic release device 50 constructed as described above
The holding protrusions 17a, 17 projecting from the inner side surface of the body 10a with respect to the holding grooves 52d, 52e provided in the yoke 52, respectively.
By fitting b, it is fixed at a fixed position of the body 10a. The yoke 52 is also fixed to the body 10a by fitting the side of the yoke 51 into the yoke mounting groove 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 cylinder 53 and the fixed iron core 5 are fixed.
5 are connected to the holding grooves 52d and 52e, respectively.
The coil cylinder 53 is fixed to a fixed position with respect to the yoke 52 by being sandwiched between the inner peripheral edge of the holding member 17 and the leading edge of the holding projection pieces 17a and 17b.

In the electromagnetic release device 50 having the above 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, the yoke 52 and the movable iron core 54. When an attractive force acts between the iron core 55 and the current passing through the coil 51 is an excessive current such as when a load is short-circuited, the movable iron core moves by the spring force of the return spring 56. 54 moves so as to approach the fixed iron core 55. Therefore, when operated in this way, the switching device 4
By operating 0, the contact portion 30 in the closed state can be forcibly opened, and is connected to the switching device 40 as follows.

That is, the tip of the hook pin 54a provided on the movable iron core 54 is connected to the shaft hole 33 of the movable contact 33x.
a and the movable contact 32x is inserted into a hooking hole 33e formed at a portion between the movable iron core 54 and the movable contact 32x. When the movable iron core 54 is attracted by the excitation of the coil 51 so as to approach the fixed iron core 55, the hook pin 54a Hook head 54 provided at the tip
b is locked on the periphery of the hook hole 33e, and the movable contact 33x
Is pulled in a direction to pull it away from the fixed contact 31x. Here, the catching hole 33e is formed in a hook-like shape by continuously connecting a catching hole having a smaller diameter than the catching head 54b and an introducing hole having a larger diameter than the catching head 54b. By introducing the hooking pin 54a into the locking hole after passing through, the electromagnetic release device 50 can be easily coupled to the movable contact 33x. Further, a pressing pin 57 fixed to the movable iron core 54
3 (the left end in FIG. 3) is the second pressing piece 4 of the tripping plate 44.
When the movable iron core 54 is sucked by the fixed iron core 55 and moves, the tripping plate 44 is
7 is rotated clockwise in FIG.

On the other hand, the thermal release device 60 includes 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 is opposed to the first pressing piece 44b of the tripping plate 44, and the bimetal 6 is pressed by an excessive current passing through the main electric path.
By pressing the tripping plate 44 with the tip of the adjusting screw 62 when the 1 is curved, the tripping plate 44 is
Is rotated clockwise in FIG.

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

Since the degree of curvature (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 connection position of the connection line 38x, the operation sensitivity of the opening / closing device 40 (ie, the opening / closing operation). In order to prevent variation in the current passing through the main circuit when the device 40 is operated, the amount of the adjustment screw 62 screwed to the bimetal 61 projecting from the bimetal 61 toward the trip plate 44 is adjusted. Need to be done. Therefore, after assembly, the adjusting screw 62 is operated with the adjusting window 63 opened. On the other hand, once the adjustment screw 62 has been adjusted, it is not necessary to operate the adjustment screw 62. Therefore, the flexible closing plate 64 is dropped into the mounting groove 63c through the insertion portion 63a, and the adjustment is performed by the closing plate 64. The window 63 is closed so that the adjusting screw 62 is not carelessly operated or foreign matter does not enter the inside of the body 10. The closing plate 64 is provided with the width of the adjusting window 63 (the mounting groove 63c).
(The distance between the bottoms of the adjustment windows 63) and the height of the adjustment window 63 in the vertical direction. When such a closing plate 64 is inserted into the adjusting window 63, the upper end of the closing plate 64 comes into contact with the upper surface of the adjusting window 63, so that the closing plate 64 cannot be removed.

Terminal plate 21 constituting movable terminal 20ax
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. In the fixed contact plate 39x, below the fixed contact 31x, a part of an arc traveling plate 71 made of a conductive plate is overlapped on a surface on which the fixed contact 31x protrudes. Arc running plate 71
The fixed contact plate 39x has a vertically extending guide piece 71a that partially overlaps, and the lower end of the guide piece 71a extends along the bottom wall of the body 10 via the inclined piece 71b that is inclined obliquely downward. Arc extinguishing piece 7 extended to below intermediate piece 52c
Continue to 1c. Here, an 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 substantially parallel 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 74a into which the lower end of the movable contact 33 is introduced is formed. The arc-extinguishing grid 72 is disposed 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 increases stepwise as it moves away from it.

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

The movable contact 33x and the coil 51
A part of the connection line 37x for connecting to one end of the base member is welded to the side piece 52a of the yoke 52 closer to the contact portion 30x. Accordingly, one end of the arc is
1, the other end of the arc moves from the arc running piece 33d of the movable contact 33x to the intermediate piece 52b of the yoke 52 when the arc is guided to the arc-extinguishing grid 72. A current flows through a route of the side piece 52a, the connection line 37x, and the coil 51. Since the direction of this current is opposite to the direction of the current flowing through the arc traveling plate 71, the intermediate piece 52c of the yoke 52 and the arc traveling plate 71
The arc receives an electromagnetic force to be guided into the arc-extinguishing grid 72 by the magnetic field generated by the current flowing through the arc. That is, the intermediate piece 52b of the yoke 52 can be used for 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 where the device is provided, the number of parts can be reduced, and the structure is simplified and the cost is reduced.

As shown in FIGS. 1 and 2, the terminal plate 2 constituting the fixed terminal 20by disposed in the storage space on the ground electrode side.
The movable contact 33y is electrically connected to 1by via a connection line 38y made of a braided wire. The connection line 38y has an insulating coating and functions as a primary side of the zero-phase current transformer 92 by being inserted through the toroidal core 91. FIG.
As shown in the figure, the connection wire 38x having an insulating coating inserted from the voltage pole side through the insertion hole 19a is also inserted into the toroidal core 91, and the toroidal core 91 is wound around the toroidal core 91.
Both ends of the next winding are connected to a leakage detection circuit 90 (see FIG. 7). Here, an eave 19b protrudes from the upper edge of the insertion hole 19a so that a connection line 38x or the like passing through the insertion hole 19a does not interfere with a portion disposed above the insertion hole 19a. The leakage detection circuit 90 has a fixed terminal 20bx,
Power is supplied from 20 by, and when a current equal to or more than a specified value flows through the secondary winding, the electromagnet device 100 is excited as a leakage current or a ground fault current. The electromagnet device 100 causes the switching device 40 arranged on the voltage pole side to operate in conjunction with the configuration described below, and when the electromagnet device 100 is excited, the switching device 40 operates to open the contact portions 30x and 30y. That is,
If there is no leakage, the currents flowing through the connection lines 38x and 38y are equal, so the magnetic fields around both the connection lines 38x and 38y are canceled out, and the current flows through the secondary winding of the zero-phase current transformer 92. Although the current does not flow, the current flowing through the two connection lines 38x and 38y becomes unbalanced due to the occurrence of the leakage, and the current flows through the secondary winding of the zero-phase current transformer 92. The leakage detection circuit 90 detects this current. 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 a connection between the fixed terminal 20bx and the test switch 93. The wire 94a is also inserted through the toroidal core 91. Therefore, when the test switch 93 is turned on, a current flows through the secondary winding of the zero-phase current transformer 92 to excite the electromagnet device 100, so that the operation of the leakage detection circuit 90 can be confirmed. Leak detection circuit 9
The circuit components constituting 0 are mounted on a 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 holding grooves 111 (see FIG. 9) provided on the inner peripheral surfaces of the body 10a and the cover 10by.

The electromagnet device 100 includes a yoke 102 formed of a magnetic material in a substantially U shape opened downward.
The coil 101 is housed in the space inside the yoke 102.
The yoke 102 includes a pair of side pieces 102a and 102b opposed to both end faces in the axial direction of the coil 101, and an intermediate piece 102c passing above the coil 101 and connecting the two pieces 102a and 102b. . One side piece 1
A through hole 102d is formed at the center of 02a. 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.
The shaft 103a of the interlocking lever 103 is interposed between 2e. A shaft pin 104 is inserted into 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 an outer periphery of a coil cylinder 105 made of an insulating material. Flanges 105a are integrally formed on both ends of the coil cylinder 105 in the axial direction. Plunger 106
Of the coil cylinder 105 is inserted through the through hole 102d so as to be movable in the axial direction. Plunger 1
06 is a plunger main body 1 inserted into the coil cylinder 105.
06a, a hook pin 106b protruding from one end surface of the plunger body 106a and having a smaller diameter than the plunger body 106a, and a hook pin 1 at the tip of the hook pin 106b.
It is formed in a shape integrally provided with a catching head 106c having a diameter larger than that of the hook head 106b. Hook pin 106b
Is a hook slit 103 provided in the interlocking lever 103 at a portion between the plunger body 106a and the hook head 106c.
b. Here, the plunger 106 has a hook pin 106b inserted into the hook slit 103b of the interlock lever 103, and the plunger body 106a and the hook head 1
Since 06c has a diameter larger than the width of the hook slit 103b, the plunger 106 does not fall off the interlocking lever 103.

The interlocking lever 103 has a pressing piece 103 on the side opposite to the hook slit 103b with the shaft 103a interposed therebetween.
c. The pressing piece 103c is inserted on the voltage pole side through the insertion hole 19c formed above the insertion hole 19a, and faces the first pressing piece 44b of the tripping plate 44 together with the adjusting screw 62 provided on the bimetal plate 61. That is, the interlocking lever 103 can operate the opening / closing device 40 by pressing the tripping plate 44 similarly to the bimetal plate 61. Hook slit 103 in interlocking lever 103
Above the part where b is formed, a pressing protruding piece 1 described later
03d is protruded.

The movable contact 33y is provided 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 the movable terminal 3y
A contact portion 30y is formed together with the fixed contact 30y provided in the ay. The movable contact 33y is held by a movable body 121 formed of an insulating synthetic resin. The movable body 121 is
The upper end of FIG. 1 is rotatably supported by a shaft pin 122 supported between the body 10a and the cover 10by. The guide electrode 16 (see FIG. 3) provided in the body 10a allows a voltage from the voltage pole side to the grounding pole. The distal end of the leg piece 48 b of the contact link 48 inserted into the side is inserted into the lower end of the movable body 121. Accordingly, as the leg piece 48b of the contact link 48 moves within the range of the guide hole 16, the movable body 121 swings about the shaft pin 122 as a center of rotation.

The movable contact 33y has a movable contact 3 at one end.
2y, a spring receiving piece 33by bent at the other end in a substantially L shape, and a supporting projection 33f protruding from both side edges of a portion between the movable contact 32y and the spring receiving piece 33by. Is formed. One end of an opening spring 34y composed of a coil spring resiliently contacts 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 contact link 48 is inserted is formed in the lower frame 121c. The movable contact 33y has a spring receiving piece 33by inserted between the upper frame 121b and the lower frame 121c of the movable body 121, and a movable contact 121y protruding from one surface of the movable contact 32y below the support projection 33f. The holding piece 121g extended below the lower frame 121c abuts on the movable body 121 by contact. The movable body 121 has a support groove 12 into which the support protrusion 33f of the movable contact 33y is inserted.
1 h is also formed. The portion of the peripheral surface of the lower frame 121c of the movable body 121 that contacts the movable contact 33y is formed in an arc-shaped cross section. Therefore, the movable contact 33y can swing with respect to the movable body 121, and the position is regulated by the holding piece 121g when the movable contact 32y approaches the fixed contact 31y. The connection line 37y described above
Is connected to the spring receiving piece 33by of the movable contact 33y through the space between the upper frame 121b and the lower frame 121c of the movable body 121. The upper frame 121b of the movable body 121 has
21i are continuously and integrally provided. Position regulating 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 an extension of the lower frame 121c.
Are protruding. The push-up protrusion 121j has a shaft protrusion 1 protruding from the inner surface of the body 10a on the ground pole side.
13 (see FIG. 9), a substantially elliptical locking lever 13 pivotally supported
The pushing piece 131a, which is one side of one, is placed on the pushing piece 131a. The locking piece 131b, which is the other piece of the locking lever 131, is connected to the body 10a.
A return spring 132 made of a coil spring is sandwiched between a spring seat piece 114 provided on the inner side surface on the ground pole side in FIG. A spring receiving recess 114a into which one end of the return spring 132 is inserted is formed in the spring seat piece 114. A locking notch 131c is formed at the tip of the locking piece 131b of the locking lever 131.

Above 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 surface of the body 10a and the cover 10by is arranged. Is established. Display piece 133
Holds a pressing spring 134 made of a coil spring between itself and the inner surface of the body 10a, and is urged leftward in FIG. 9 by the pressing spring 134. On the lower surface of the display piece 133, a pressing protrusion 133a pressed by the upper end of a pressing protrusion 103d provided on the interlocking lever 103, and the locking lever 1
Locking projection 13 that can be hooked on locking notch 131c
3b is protruded. Further, on the upper surface of the display piece 133, a display area 133c in which characters are written or colored differently from other parts is formed. A display window 135 made of a transparent plate is mounted on the body 10 above the display piece 133. The display piece 133 has a display area 133 c in the display window 13.
5 and the display area 133c is in the display window 1
It slides between the non-display positions that do not reach 35.

When the movable body 121 is located at a position where the movable contact 32y contacts the fixed contact 31y, the locking lever 131 positions the locking piece 131b below the locking projection 133b of the display piece 133. The movable contact 3
When the movable body 121 is located at a position where 2y is separated from the fixed contact 31y, the locking piece 1 is moved by the spring force of the return spring 132.
By pushing up 31b, the notch 131c for locking is located at a position where it can be hooked on the projection 133b for locking. Further, 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 operation of the electromagnet device 100, thereby displaying the pressing force against the spring force of the pressing spring 134. The piece 133 is slid toward the display position. If the movable contact 32y is separated from the fixed contact 31y when the display piece 133 slides against the spring force of the pressing spring 134, the locking notch 131c is hooked by the locking notch 131c. Thus, the display piece 133 is held at the position where the compression spring 134 is compressed. This position is the display position, and the display area 133c faces the display window 135.

The test switch 93 is attached to the body 10 so that a pressing force can be applied to the pair of contact plates 141 and 142 and the movable piece 142a provided on the one contact plate 142. A push button 143 is provided. The holding protrusion 141 is provided on the side edge of the contact plate 141.
a is protruded, and the holding protrusion 141 a is attached to the body 1.
The contact plate 141 is fixed to a fixed position of the body 10 by press-fitting into a holding hole (not shown) provided in a protruding base 116 protruding from the inner surface of the ground electrode 0a on the side of the ground electrode. Here, the contact plate 141 is arranged in the up-down direction, and the upper edge is the contact plate 14.
It is located below the second movable piece 142a.

The contact plate 142 has a movable piece 142a and a fixed piece 142b.
Are integrally and continuously formed by the bridging piece 142c on the fixed end side of the movable piece 142a. The bridging piece 142c has a curved shape that is convex upward, and the contact plate 142 is fixed to the body 10 by press-fitting the bridging piece 142c into a holding hole 117 provided in the body 10a. Fixed piece 1
42b is mounted on a mounting table 118 protruding from the inner surface of the body 10a on the grounding pole side, and a terminal strip 142d protruding from the side edge of the fixing piece 142b is connected to a connection wire 94b having one end connected to the leakage detection circuit 90. Is connected. Further, a position regulating protrusion 121i provided on the movable body 121 is located below the movable piece 142a. The tip of the position regulating protrusion 121i is the movable contact 3
When the movable contact 32y 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 has 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, a portion of the movable piece 142a that faces the above-described position regulating protrusion 121i is a push protrusion 143a.
The movable piece 142a is located between a portion receiving a pressing force from the contact portion and a portion where the movable piece 142a contacts the contact plate 141. Therefore,
When the movable contact 32y is in contact with the fixed contact 31y, by applying a pressing force to the push button 143, the movable piece 142a can be brought into contact with the contact plate 141, and the test switch 93 is turned on. Further, the movable contact 32y is a fixed contact 3
1y, even if a pressing force is applied to the push button 143, the downward movement of the movable piece 142a is prevented by the position regulating projection 121i, and the movable piece 142a is
41 cannot be contacted. The push button 143 is housed in a button housing recess 119 provided on the upper surface of the body 10, and a step portion 143 b formed on both side edges of the push button 143 is engaged with a retaining piece 119 a protruding from an opening edge of the button housing recess 119. By stopping, dropping from the container 10 is prevented.

Incidentally, the movable terminals 20ax, 20ay
And the fixed-side terminals 20bx and 20by respectively include a terminal fitting 22 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 a terminal plate 21a contacting the lower end of the tightening screw 23
x, 21ay, 21bx, and 21by. The terminal fittings 22 are housed in terminal housings 24ax, 24ay, 24bx, 24by formed in the body 10 so as to be movable up and down. That is, the terminal storage chambers 24ax, 24ay, 24bx, and 24by have a larger height dimension than the terminal fitting 22, and the terminal fitting 22 is prevented from rotating in the terminal storage chambers 24ax, 24ay, 24bx, and 24by and can move only in the vertical direction. It has become. The head of the tightening screw 23 is formed in a truncated conical shape in which the upper part has a smaller diameter than the lower part, and the terminal storage chambers 24ax, 24ay, 24
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 wall of bx, 24by. The diameter of the upper part of the screw operation hole 25 is the tightening screw 2
3 is smaller than the upper end of the head, and the diameter of the lower part of the screw operation hole 25 is set larger than the lower end of the head of the tightening screw 23. Terminal boards 21ax, 21ay, 21b
The distal ends of x and 21by are exposed on the outer surface of the body 10 and are bent upward, so that the terminal plates 21ax, 21ay and 21b are opposed to the fixing grooves 26 formed on the outer surface of the body 10.
The terminal strips 21ax, 21ay, 21ay are formed by engaging the fixed projections 21c formed at the tips of the x, 21by.
The vertical movement of the tip of bx, 21by is prohibited.
Further, the terminal storage chambers 24ax, 24ay, 24bx, 2
Terminal storage chamber 24 that partitions 4 by from internal space of body 10
A terminal plate holding groove 27 for positioning the terminal plates 21ax, 21ay, 21bx, 21by is formed on side walls of the axes ax, 24ay, 24bx, 24by. Terminal boards 21ax, 21a
The vertical movement of y, 21bx, 21by is prohibited. That is, the terminal plates 21ax, 21ay, 21bx, 21b
Since the vertical movement is prohibited on both sides of the portion abutting on the tightening screw 23 in y, even if an external force is applied from the tightening screw 23, the terminal plates 21ax, 21ay, 21bx, 2
1 by is fixed at a fixed position. 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 substantially equal to the length of the tightening screw 23.

When the tightening screw 23 is rotated by inserting the tip of a flathead screwdriver or the like into the screw operation hole 25, the terminal fitting 22 is rotated depending on the rotation direction of the tightening screw 23.
Moves up and down, so that 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
ax, 21ay, 21bx, 21by A wiring member such as an electric wire or a bus bar is inserted into a connection hole 28 penetrating through the peripheral wall of the body 10 corresponding to a part between the tightening screw 23 and the tightening screw 23. Rotate the lower piece of the terminal fitting 22 to the terminal plate 21.
ax, 21ay, 21bx, 21by, the wiring member is connected to the terminal fitting 22 and the terminal plates 21ax, 21a.
y, 21bx, and 21by, and can be electrically connected to the wiring member.

A mounting rail (so-called DIN rail) 80 disposed inside the distribution board or the like is provided on the lower surface of the body 10.
An attachment device is provided for detachably fixing the unit to (see FIG. 5). The mounting rail 80 has a shape in which a flange piece 80a is integrally protruded outwardly over the entire length at the distal end edges of both leg pieces of the rail body having a substantially U-shaped cross section. Movable terminals 20ax, 20ay are provided on the lower surface of the body 10.
A mounting groove 81 is formed which runs in a direction orthogonal to the direction connecting the fixed terminals 20bx and 20by, and a mounting rail 80 is provided between one side 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 flange pieces 80a is inserted protrudes. 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 inserted into 3.

As shown in FIG. 3, the slider 84 has an operating portion 84a, one end of which protrudes from the outer surface of the container 10, and a connecting piece 84b extending from the operating portion 84a in the center line direction of the storage groove 83. A claw portion 84c integrally provided at a distal end portion of the connecting piece 84b and protruding into the mounting groove 81; and a pair of bending pieces integrally extended from the operating portion 84a on both sides of the connecting piece 84b in parallel with the connecting piece 84b. 84d is formed continuously and integrally from a synthetic resin into a shape having the shape 84d. Positioning projections 84e project from the distal end of each bending piece 84d in a direction away from the coupling piece 84b. Further, the positioning protrusion 84e
A V-shaped groove 84f is formed on the tip end surface of the.

Although not shown, a positioning restricting piece 84e is formed on the inner side surface of the storage groove 83, and a movement restricting recess in which the width of the storage groove 83 in the center line direction is longer than the positioning protrusion 84e. The slider 84 can slide within the range of the movement restriction recess. Further, the claw portion 84c of the slider 84 is protruded into the mounting groove 81 on the inner peripheral surface of the movement restricting recess, and the flange 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 state, a mountain projection that engages with the V-shaped groove 84f is formed.

According to the above configuration, 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 connected to the inner bottom surface of the mounting groove 81. When the slider 84 is pushed into the body 10 in a state where the slider 84 is brought into contact with the bracket 80, the other flange 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 case 10 can be fixed to the mounting rail 80. At this position, the mountain protrusion engages with the V-shaped groove 84f, and the movement of the slider 84 is prohibited.

On the other hand, to remove the body 10 from the mounting rail 80, the operating portion 84a projecting from the side of the body 10
If the slider 84 is pulled out of the body 10 by inserting the tip of a flathead screwdriver or the like into the insertion hole 84g provided in the
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 pole side, and the operation portion 41a of the operation handle 41 is tilted rightward in FIG. At this time, the tripping plate 44 is urged counterclockwise in FIG. 8 around the shaft pin 47 by the spring force of the handle return spring 43, and the first pressing piece 44 b faces the tip of the adjusting screw 62 provided on the bimetal 61. Is maintained. 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 48 of the contact link 48 is actuated.
Since the distance between a and the shaft protrusion 41d provided on the operation handle 41 is regulated by the handle link 45, the latch plate 46 receives the spring force of the opening spring 34x and is attached counterclockwise around the handle shaft 42. Be inspired. Therefore, the locking piece 46a of the latch plate 46 is engaged with the locking groove 44e provided on the arm piece 44d of the tripping plate 44.
That is, since the latch plate 46 tries to rotate clockwise, but the rotation is prohibited by the trip plate 44, FIG.
Is maintained. In this state, the latch plate 46
The position is fixed by the handle shaft 42 and the tripping plate 44, and the handle link 45 and the contact link 48 are also fixed in place. As a result, the movable contact 33x is urged counterclockwise around the leg 48b of the contact link 48 by the spring force of the opening spring 34x. That is, the movable contact 32x is
The fixed contact 31x contacts with the 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 6.

On the ground electrode side, the contact portion 30 on the voltage electrode side
When x is in the closed state, the leg piece 48b of the contact link 48 is located at the left end of the guide hole 16, and the movable contact 33y is pressed leftward by the movable body 121, as shown in FIG. 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 applies a contact pressure to the contact portion 30y. As described above, when the contact portion 30x is closed on the voltage electrode side, the contact portion 30y is also 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 leftward 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
Of the contact piece 48 moves to the right.
8a is to be lifted upward. However, a shaft projection 41d is formed with respect to a straight line connecting the handle shaft 42 and the leg piece 48a.
Moves 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 rotate the operation handle 41 further counterclockwise, The leg piece 48b of the contact link 48 moves leftward along the guide hole 16. By moving the leg piece 48b of the contact link 48 leftward in this manner, the spring receiving piece 33b of the movable contact 33x is moved.
x comes into contact with a 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. When the contact portion 30x is open, the latch plate 46 is connected to the handle link 45 and the leg piece 48 of the contact link 48.
As a result, it rotates counterclockwise about the handle shaft 42 and comes off the trip plate 44.

By operating the operation handle 41, the contact 3
When the contact 0x is opened, the leg piece 48b of the contact 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 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 urges the movable contact 33y clockwise in FIG. 11 around the contact portion with the lower frame 121c of the movable body 121, but is pressed by a pressing piece 121g provided on the movable body 121. Since the movement of the movable contact 33y is restricted, the movable contact 32y is
No contact with 1y.

In the closed state shown in FIGS. 8 and 9, when the overload occurs and an excessive current flows through the bimetal 61 to bend the bimetal 61, the first pressing piece 44b of the tripping plate 44 is It is pressed by an adjusting screw 62 screwed to the bimetal 61. 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 tripping plate 44
Is pressed by the pressing pin 57 which 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 to excite the electromagnet device 100 via the leakage detection circuit 90, and the plunger 106 is drawn into the coil 101. Since the interlocking lever 103 rotates around the shaft pin 104,
As shown 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 tripping plate 44 rotates clockwise about 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 urged 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 contact link 48 that was the rotation center of the movable contact 33x in the closed state.
12 moves to the left 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, as in the open state shown in FIG. The contact 32x is separated from the fixed contact 31x and becomes an open state. That is, when an excessive current flows in the main electric circuit, the engagement state with the latch plate 46 is released by the rotation of the tripping plate 44, and the force that has urged the latch plate 46 is released. A so-called trip operation is performed to open the contact portion 30x. The trip plate 44 and the latch plate 46 are operated by the trip operation.
When the contact portion 30x is opened by being disengaged from the contact handle 30x, the operation handle 41 can freely rotate around the handle shaft 42. Therefore, the operation handle 41 is turned off by the spring force of the handle return spring 43 (see FIG. 10 position). At this time, the electromagnetic release device 50, the thermal release device 60, and the electromagnet device 100 are all returned to the original state by opening the contact portion 30x. Therefore, immediately after the trip operation, the operation handle 41 is operated to turn off. Will return to the same state as when

When the contact portion 30x is opened by the trip operation, the leg piece 48b of the contact link 48 is opened on the ground electrode side in the same manner as when the contact portion 30x is opened by the operation handle 41 as shown in FIG. Of the movable body 121
To move the movable contact 32y away from the fixed contact 31y. That is, if the contact portion 30x on the voltage electrode side is opened by the trip operation on the ground electrode side, the contact portion 30y is interlocked.
Is opened.

By the way, the contact portions 30x, 30
If y is opened, there is a danger unless it is restored after removing the leak location. Therefore, the contact portion 30
When x and 30y are opened, the plunger 106 turns the coil 1
01, the interlocking lever 103 rotates, and the pressing protrusion 133a of the display piece 133 is pressed by the pressing protrusion 103d provided on the interlocking lever 103 against the spring force of the pressing spring 134. That is, the display piece 133 slides, and the display area 133 c coincides with the display window 135.
Here, the movable body 121 is opened so as to open the contact portion 30y.
13 is moved to the right in FIG. 13, the pushing piece 131 a of the locking lever 131 is
The locking piece 131b moves downward due to the spring force of the return spring 132, and moves downward with the movement of 21j. As a result, the locking notch 131c of the locking lever 131 is engaged with the locking projection 133b of the display piece 133, and the display piece 133 is locked.
At the display position where the display area 133c matches the display window 135. In this manner, when the trip operation is performed due to the electric leakage, the display piece 133 is displayed, and the display state is maintained until the contact portions 30x and 30y are closed by the operation of the operation handle 41 next. Here, when no electric leakage is detected,
Receives the spring force from the pressing spring 134 via the display piece 133 to keep the plunger 106 at the position where it protrudes 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 attraction force acting between the side piece 102b of the yoke 102 and the plunger body 106a.

The test switch 93 is connected to the leakage detection circuit 90
It is provided to test the operation of. That is, when the contact portions 30x and 30y are closed, the push button 143
By pressing the contact plate 14 as shown in FIG.
When the movable piece 142b of the contact plate 142 is brought into contact with the contact plate 1, a current flows through the connection wire 94a and a current flows through the secondary winding of the zero-phase current transformer 92. It is causing it. After the contacts 30x, 30y are opened, the movable switch 142a is pushed up by the position restricting projection 121i provided on the movable body 121 and the push button 14 is pressed as shown in FIG.
3 so that the movable piece 142a cannot come into contact with the contact plate 141 even if the user presses the button 3. That is, the movable terminal 20b
If x and 20by are the power supply side, the power supply 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 restricting projection 121i, and the push button 143 is pressed.
Even if is kept pressed, the short circuit state is not continued.

[0060]

According to the first aspect of the present invention, the display piece is urged by the push spring toward the non-display position, and no spring force is accumulated in the press spring at the non-display position. However, there is an advantage that the display piece does not move to the display position even if the function is performed, and erroneous display can be reliably prevented.
In particular, in the case of an earth leakage breaker that also has the function of detecting an overload or short circuit and shutting off the main circuit, the operation of the switchgear during overload or short circuit causes vibration or impact. By adopting the configuration of the first aspect of the present invention, it is possible to clearly distinguish between interruption due to electric leakage and interruption due to overload or short circuit.

Further, when the main electric circuit is cut off due to electric leakage, the display piece is locked in a state where the spring force is accumulated in the pressing spring.
The display piece can be returned to the non-display position only by releasing the lock, and as a result, the number of parts can be reduced as compared with the conventional configuration. The invention of claim 2 uses the plunger for the electromagnet device,
Even if it is small, a large attractive force can be obtained, and the influence of friction is reduced by rotating the interlocking lever. Thus, there is an advantage that it is possible to apply a large force, and it is possible to surely perform the interruption of the main electric circuit and the display of the leakage when the leakage is detected.

[Brief description of the drawings]

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

FIG. 2 is a perspective view of the embodiment in a state where a cover on a ground electrode side is removed.

FIG. 3 is an exploded perspective view of a voltage pole side in the embodiment.

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

FIG. 5 is an external perspective view showing the embodiment.

FIG. 6 is a cross sectional view showing the embodiment.

FIG. 7 is a circuit diagram of the embodiment.

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

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

FIG. 10 is a side view of the embodiment, showing a contact opening state, with a cover on the voltage pole side removed.

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

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

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

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

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

[Explanation of symbols]

 33x movable contact 33y movable contact 40 switching device 92 zero-phase current transformer 100 electromagnet device 103 interlocking lever 103a shaft portion 103d pressing protruding piece 104 shaft pin 106 plunger 131 locking lever 131c locking notch 133 display piece 133a pressing protrusion 133b Locking projection 134 Press spring

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tomoyuki Sawada 1048 Kazumasa Kadoma, Osaka Prefecture Matsushita Electric Works, Ltd. References JP-A 53-115374 (JP, U) JP-A 52-39727 (JP, Y1) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01H 83/02

Claims (2)

(57) [Claims] 1. A zero-phase current transformer having a main circuit between a power supply and a load as a primary side, and a secondary output of the zero-phase current transformer when an imbalance occurs in a current flowing through the main circuit. An electromagnet device that operates, a switchgear that cuts off a main electric path by opening a movable contact in response to the operation of the electromagnet device, and a display position and a non-display position that display the operation of the electromagnet device. Press spring for urging the display piece toward the non-display position in the earth leakage breaker having the display piece movable between
An interlocking lever that moves the display piece to the display side against the spring force of the push spring in conjunction with the operation of the electromagnet device;
And a locking member which is substantially in the shape of a hook having a locking piece and which is pivotally supported by the body.
Stop lever and return lever that pushes the locking piece to a position where it can be hooked on the display piece
A return spring is provided, and the movable contact is driven to open by the opening / closing device, and the pushing piece moves with the movement of the opening / closing device.
When the locking piece is in a position where it can
Earth leakage breaker, characterized in that the locking piece when the display piece in conjunction with the operation of the magnet device is located in the display position is held in the display position against the spring force of the spring pressing the display piece. 2. An electromagnet device comprising a plunger which can move forward and backward, and which is rotatably supported at a fixed position and which is linked to the electromagnet device and a display piece via an interlocking lever in which the plunger is engaged with a portion different from the shaft support portion. The earth leakage breaker according to claim 1, wherein: