JPH07161280A - Earth leakage breaker - Google Patents

Abstract

PURPOSE:To provide an earth leakage breaker in small size at a low cost whose action and reliability can be confirmed before completion by forming each part of an earth leakage trip device into a unit mounted in a storage case through a partition, and further exposing buttons in the upper part. CONSTITUTION:An earth leakage trip device 20 comprises an earth leakage trip electromagnet part 30 for placing a switching mechanism of a main circuit in an interrupted condition when detected a leak current in a zero phase converter, earth leakage display button part 50 for displaying action of this electromagnet part and a test switch part 40 for carrying a dummy leak current. The earth leakage trip device 20 is stored in a synthetic resin-made mold case with the switching mechanism. In this earth leakage breaker, a fitting part separated by a partition is provided in a storage case 21, integrally formed of synthetic resin material, to mount the earth leakage trip electromagnet part 30, test switch part 40 and the earth leakage display button part 50 respectively fitted. Further, a test button and earth leakage display button, passing through a button hole provided in a cover, are exposed in a surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a relatively small leakage breaker used for a distribution board of a factory or a main switch of a general household.

[0002]

2. Description of the Related Art FIG. 12 is a front view of an earth leakage trip device 20 in a conventional earth leakage breaker disclosed in, for example, Japanese Utility Model Laid-Open No. 5-45874. In the figure, 2 is a cover forming a molded case of an earth leakage breaker, 10 is a mount for forming an earth leakage trip device, 11 is an exciting coil, 12 is a plunger, 13 is a display button, and is always pulled in. In this state, the plunger 12 is locked. Reference numeral 14 denotes an urging spring for the display button 13, which urges the display button 13 in a direction in which the display button 13 is projected (upward in the drawing). A test button 15 is attached to the cover 2. Reference numeral 16 is a test contact formed of a leaf spring and is driven by the test button 15. Reference numeral 17 denotes a test resistor, one end of a lead wire of which is arranged at a position facing the tip of the test contactor 16. FIG. 11 shows the internal circuit configuration of the earth leakage breaker. Reference numeral 5 is an overcurrent trip device, 6 is an electronic circuit portion for earth trip, and 7 is a zero-phase current transformer.

Next, the operation will be described. When a leakage current flows through the load circuit of the earth leakage breaker, this current is detected by the zero-phase current transformer 7 via the earth leakage trip electronic circuit section 6, and the exciting coil 11 is excited by the signal, and the plunger 1
2 is aspirated. By this operation, the main circuit is shut off by interlocking the opening / closing mechanism of the earth leakage breaker. Also, the plunger 1
The display button 13 that has been locked to 2 is unlocked and the biasing spring 14 causes the display button 13 to project. It is displayed that leakage has occurred due to this protruding operation. The test button 15 is arranged so as to be pushed in from the outside of the cover 2, and when pushed in, the test contact 16 is elastically deformed and comes into contact with one end of the lead wire of the test resistor 17. Due to this contact, a pseudo leak current is generated by a test circuit preconfigured using the test resistor 17 and the like, and an operation similar to the operation by the leak current detection of the zero-phase current transformer is performed to thereby cause an earth leakage breaker. Check whether is normal.

[0004]

Since the conventional earth leakage trip device is constructed as described above, it has various problems as described below. (A) The test button 15 is attached to the cover 2,
Since it is configured to be pushed in from the outside of the cover 2, the test operation cannot be confirmed unless the earth leakage breaker is in a completed state. (A) Since the test contactor 16 and the contact terminal portion (one end of the lead wire of the test resistor 17) are exposed, contact failure occurs due to rust generation or contamination by arc gas at the time of interruption, and the test switch Reliability is reduced. (C) The pressing force of the test button 15 may cause the test contact 16 to exceed the elastic allowable stress and be plastically deformed. (D) Since the holding of the test button 15 and the holding of the test contactor 16 and the contact terminal portion are performed by different members, the contact reliability of the test operation may be deteriorated due to the variation of the related positions. .

The present invention has been made in order to solve the above problems, and it is possible to unite the earth leakage trip device and confirm the operation and reliability even before the earth leakage breaker is completed. It is an object of the present invention to provide an inexpensive and small earth leakage circuit breaker.

[0006]

SUMMARY OF THE INVENTION A ground fault circuit breaker according to the present invention includes a ground fault tripping electromagnet section for closing an opening / closing mechanism of a main circuit when a leak current is detected by a zero phase current transformer, and a zero phase. It has a test switch part that energizes the current transformer with a pseudo leakage current and shuts off the switching mechanism of the main circuit, and an earth leakage trip button with a leakage indication button part that indicates when the electromagnet part operates. When the device is housed in a molded case, the electromagnet fitting recess, the test switch fitting cylinder and the display button fitting cylinder are separated by a partition, respectively, into a storage case integrally formed of a synthetic resin material. The earth leakage trip electromagnet, the test switch, and the earth leakage display button are fitted to form the earth leakage trip device, and the test button and earth leakage display button penetrate through the button holes provided in the cover to cover the mold case. In which the earth leakage trip unit is mounted so as to be exposed on the surface.

Further, an electronic circuit unit for earth leakage trip is arranged between the overcurrent trip device and the terminal device, the earth leakage trip device is arranged adjacent to the switching mechanism, and is placed in a storage case of the earth trip device. In the storage case of the earth leakage trip device placed adjacent to
An isolation wall made of synthetic resin having a U-shaped groove extending along the side edge of the overcurrent trip device in the direction of the earth leakage trip electronic circuit portion is provided, and an earth trip trip electronic circuit portion is provided. A lead wire for connecting an earth leakage trip device is housed in the U-shaped groove, and an earth leakage breaker is configured so that the lead wire does not come into contact with an overcurrent trip device.

Further, in the earth leakage trip device, when the plunger portion is fitted into the opening portion of the plunger through hole communicating with the electromagnet fitting recess formed in the housing case of the earth leakage trip device, the plunger portion is elastically deformed and fitted. After assembling, the elastic protrusion is provided to lock the plunger and prevent the plunger from falling off.

Further, the display button fitting cylinder portion formed in the storage case of the earth leakage trip device and the earth leakage display button fitted in the display button fitting cylinder portion are displayed so as to be slidable in a line contact state. The cross-sectional shapes of the button fitting cylinder portion and the leakage display button are set.

Further, a pair of contact terminals are provided on the test switch fitting cylinder formed in the storage case of the earth leakage trip device, and the fitted test button has a bottom portion of a substantially U-shaped contactor. And a holding frame portion formed so as to hold both side surfaces of the lower side portion and the center of the U-shaped portion,
A holding plug for holding the contact is provided in cooperation with the holding frame, and the U-shaped contact is brought into contact with the pair of contact terminals by pressing the test button.

Then, a part of the partition wall of the test switch fitting tubular portion is formed by the flange portion of the bobbin of the earth leakage tripping electromagnet portion fitted in the recess portion for fitting the electromagnet, and the lead-out for the electromagnet coil provided in this flange portion is formed. One end of the terminal serves as one of the pair of contact terminals.

[0012]

In the earth leakage breaker configured as described above, the earth leakage tripping electromagnet section, the test switch section, and the earth leakage indicating button section are fitted in the storage case integrally formed of the synthetic resin material to remove the earth leakage. Since the device was configured and the earth leakage breaker was installed so that the test button and the earth leakage display button penetrated the button holes provided in the cover and were exposed on the surface of the cover of the mold case, The test operation can be confirmed even in the state.

Further, an interphase insulating wall made of a synthetic resin material, which is extended along the side edge of the overcurrent trip device in the direction of the electronic circuit for earth leakage trip and has a U-shaped groove, is provided. By housing the lead wire in the groove, the lead wire does not interfere with the operation of the overcurrent trip device and is safe in terms of electrical insulation.

Further, the elastic projection provided at the opening of the plunger through hole communicating with the electromagnet fitting recess of the storage case of the earth leakage trip device prevents the plunger from slipping off after fitting and fitting and assembling. To work.

Further, by forming the cross-sectional shape so that the display button fitting cylinder portion and the leakage display button can slide in the line contact state, the leakage display button works to perform a stable operation.

Further, the test button is inserted in a U-shaped center and a holding frame portion formed so as to hold both side surfaces of a bottom portion and a lower side portion of a substantially U-shaped contactor.
By providing a holding stopper that holds the contact together with the holding frame portion,
Since it is configured to be able to contact the pair of contact terminals of the test switch fitting tubular portion, contact failure is prevented due to contamination by arc gas at the time of generation of rust or interruption, and the reliability of the test switch is improved.

Further, a part of the partition wall of the test switch fitting cylinder portion is formed by the collar portion of the bobbin of the earth leakage tripping electromagnet portion fitted in the recess portion for fitting the electromagnet, and the lead-out for the electromagnet coil provided in this collar portion is formed. By constructing one end of the terminal as one contact terminal of the pair of contact terminals, the device is simple and compact.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 9 and 10, 1 is a base, 2 is a cover, and the base 1 and the cover 2 form a molded case. 3 is a tilting handle, 4 is a terminal device, 5 is an overcurrent trip device, 6 is an electronic circuit section for earth leakage trip, 7 is a zero-phase current transformer, and is close to the electric circuit section 6 for earth leakage trip. Is provided. Reference numeral 8 is a lead wire for connecting the earth leakage trip device 20 and the earth leakage trip electronic circuit section 6. These are similar to the above-mentioned conventional devices.

1 to 8 show the details of an earth leakage trip device 20 which is a main part of the present invention. In the figure,
Reference numeral 21 denotes a storage case formed of a relatively elastic synthetic resin material, in which the electromagnet fitting recess 21a, the test switch fitting tubular portion 21b, and the display button fitting tubular portion 21c are separated from each other by partition walls. Has been done. Further, the test switch fitting tubular portion 21b and the display button fitting tubular portion 21c are arranged in parallel. Reference numeral 21d is an interphase insulating wall made of a synthetic resin material, and has a U-shaped groove 21e for accommodating the lead wire 8. 21f is an electromagnet fitting recess 2
It is a plunger through hole communicating with 1a, and is located between the test switch fitting tubular portion 21b and the display button fitting tubular portion 21c, and an elastic projection portion 21g described later is provided at the inlet portion. The test switch fitting recess 21b is provided with a pair of contact terminals 22a and 22b. However, the contact terminal 22b in this embodiment is formed by the tip portion of the lead-out terminal 34 fitted in the collar portion 31a of the bobbin 31 as described later.

Reference numeral 30 denotes a leakage tripping electromagnet portion fitted in the electromagnet fitting recess 21a, which includes a bobbin 31, a U-shaped yoke 32, a leakage tripping coil 33, a lead terminal 34 made of a conductive material, and a plunger portion 35. It is composed of a plunger spring 36 and the like. Bobbin 31 has yokes 3 at both ends
Collar portions 31a and 3 formed so that 2 can be fitted therein.
With 1b. The flange portion 31a and the yoke 32 are provided with insertion holes 31c and 32a for the plunger portion 35 which is fitted through the plunger through hole 21f. Further, the lead-out terminal 34 is fitted in the flange portion 31a, and the tip thereof is exposed on the surface of the flange portion 31a to form the contact terminal 22b. 31d is a fitting protrusion, which is a collar portion 31.
The electromagnet fitting recess 2 of the storage case 21 on both sides of b
It is formed so as to elastically engage when it is fitted into the la 1a. The earth leakage trip coil 33 is wound around the bobbin 31 and configured to attract the plunger portion 35 when excited.

The plunger portion 35 has a plunger core 37.
And a plunger hook 38 made of synthetic resin fixed to the tip of the plunger core 37. The plunger hook 38 is provided with a locking projection 38b that engages with the engaging portion 51c of the earth leakage display button 51 on the lower side, and a trip hook 38a on the front side. The tripping hook 38a is formed and arranged to engage with and actuate a trip bar (not shown) when the plunger core 37 is attracted. When the plunger portion 35 is fitted,
Elastic protrusion 21 provided at the entrance of the plunger through hole 21f
g is elastically deformed as shown by the arrow in FIG. 5, and the plunger portion 35 is fitted therein. After fitting, the plunger hook 38 is locked by the elastic protrusion 21g so as not to fall off.

Reference numeral 40 denotes a test switch portion which is fitted in the test switch fitting tubular portion 21b. The test button 41 is made of red synthetic resin and is made of an elastic conductive material U.
It is composed of a contact 42 formed in a letter shape, a test spring 43 that works to push up the test button 41, and the like. The test button 41 is provided with a cylindrical operation portion 41a at its tip and elastically deformable locking claws 41b, 41c at its lower end. The operation portion 41a and the locking claws 41b, 41
As shown in FIG. 6 (b), a contact 42
Is compressed and fitted like the one-dot chain line. That is, a holding frame portion 41d formed so as to hold both bottom surfaces and both side surfaces of the lower side portion of the contact 42 formed in a substantially U shape, and a holding plug provided so as to be inserted in the center of the U shape. The contactor 42 compression-fitted by 41e is held. The test button 41 holding the contact 42 is fitted into the test switch fitting tubular portion 21b. Then, it is normally pushed up by the test spring 43, and the locking claw 41
It is locked to the end portion of the test switch fitting tubular portion 21b by b and 41c.

When the operating portion 41a of the test switch portion 40 fitted in the test switch fitting tubular portion 21b is pushed in, both ends of the contact 42 are moved as shown in FIGS. 6 (a), 7 (a) and 7 (b). It contacts the pair of contact terminals 22a and 22b. In this case, even if the contactor is tilted at the angle θ in FIG. 7C, the contactor 42 is not fixed, and thus contacts normally.

Reference numeral 50 denotes an earth leakage display button portion fitted in the display button fitting cylinder portion 21c, such as an earth leakage display button 51 formed of white synthetic resin, and a display button spring 52 which works to push up the earth leakage display button 51. It is composed by. The earth leakage display button 51 is provided with a cylindrical display portion 51a at its tip and an engaging portion 51b at its lower end that engages with a vertical crossbar (not shown) according to the operation of the opening / closing mechanism. A locking step portion 51c formed to engage with a locking projection 38b provided on the lower side of the plunger portion 35 is provided in the intermediate portion. Normally, the leakage display button portion 50 is in the retracted state, and the engagement portion 51c has the locking projection 3
It is locked by 8b.

As for the relationship between the display button fitting cylinder portion 21c and the earth leakage display button 51, as shown in FIG. 8, the cross section of the earth leakage display button 51 is set to a cross shape so as to be in a line contact state. is there. This prevents the operation from being hindered by dust or the like.

The earth leakage trip device 2 constructed as described above
0 is adjacent to the opening / closing mechanism of the main circuit as shown in FIGS. 9 and 10, and the trip hook 38a of the plunger portion 35 is removed.
Engages a trip bar (not shown),
The electric leakage display button portion 50 is placed so that the engaging portion 51b engages with the crossbar (not shown). The lead wire 8 from the earth leakage trip electromagnet portion 30 and the test switch portion 40 is connected to the earth leakage trip electronic circuit portion 6. Test button 4
1 operation unit 41a and the display unit 51a of the earth leakage display button 51
When the cover 2 is put on, it is exposed through the button hole (not shown) on the surface of the cover so that it can be operated and displayed. However, since the earth leakage trip device 20 is unitized, it can be operated and displayed even without the cover 2. The internal circuit of the earth leakage breaker is the same as that of the conventional device shown in FIG.

Next, the operation of the earth leakage breaker and the earth leakage trip device configured as described above will be described with reference to FIGS. 3, 4 and 5. Now, the leakage current generated in the load circuit of the earth leakage breaker is converted into the zero-phase current transformer 7 built in the earth leakage breaker.
Detected by, and the earth leakage trip coil 33 of the earth leakage trip device 20.
To excite. By this excitation, the plunger portion 35 overcomes the biasing force of the plunger spring 36 and is attracted. In this process, the earth leakage display button 51 is disengaged by the engagement protrusion 38b and protrudes to the front surface side of the cover 2 by the urging force of the display button spring 52, indicating that electricity leakage has occurred. At the same time, the trip hook 38a of the plunger portion 35 actuates the trip bar to open the main contact of the earth leakage breaker.

When the main contact is opened, the excitation of the earth leakage trip coil 33 disappears and the plunger portion 35 returns to the position where the locking projection 38b abuts the earth leakage display button 51 by the urging force of the plunger spring 36. . Note that the protruding earth leakage display button 51 continues to hold the protruding state, but when the earth leakage circuit breaker is reset and then re-closed, the earth leakage display button 51 is engaged with the up / down crossbar according to the operation of the opening / closing mechanism and is drawn. At this time, the plunger portion 35 is completely returned, the engaging portion 51c of the electric leakage display button 51 is locked by the locking projection 38b, and the electric leakage display button 51 is maintained in the retracted state. Further, the plunger portion 35 has an elastic protrusion 21g.
It is locked by and returns to the normal state.

Next, the operation of the test switch section 40 will be described with reference to FIG.
This will be described with reference to FIG. Now, when the test button 41 is pushed down, the U-shaped contactor 42 short-circuits the pair of contact terminals 22a and 22b. Due to this short circuit, a pseudo-leakage current is generated in the zero-phase current transformer 7, and the series of operations for tripping and cutting off the leakage current is completed as described above. When the test button 41 is pressed down, the contact terminal 22
Even if the positions of a and 22b are deviated, or the test button 41 is tilted as shown in FIG. 7C, the U-shaped contact 42 is moved in the test button 41 and positioned. Is fitted so that it can be corrected. Therefore, a well-balanced contact state with the contact terminals 22a and 22b can be obtained. Further, the contact terminals 22a and 22b and the contact 42
Since they come into contact with each other by rubbing against each other, even if the contact surface is soiled, this soiling can be removed and stable contact can be obtained.

[0030]

Since the present invention is constructed as described above, it has the following effects.

The earth leakage trip electromagnet section, the test switch section, and the earth leakage display button section are housed in a storage case made of a synthetic resin material to unitize the earth leakage trip device, which is incorporated in a mold case to cause earth leakage. Since the circuit breaker is configured, the earth leakage trip device has a precise positional relationship between the respective parts and is miniaturized. Since the positional relationship is accurate, it is easy to install, and various operation tests can be performed without the cover. Therefore, it is possible to provide a small-sized, highly-assembled and highly reliable earth leakage breaker.

In the storage case of the earth leakage trip device, an isolation member made of a synthetic resin material, which is extended along the side edge of the overcurrent trip device in the direction of the electric circuit for earth leakage trip and has a U-shaped groove. Since a wall is provided and the connecting lead wire is housed in this U-shaped groove, malfunctions of the overcurrent trip device and the leakage display button part due to contact of the lead wire are prevented, and the insulation of the lead wire is maintained. The reliability of the earth leakage breaker is improved.

The opening portion of the plunger through hole of the storage case of the earth leakage trip device is provided with an elastic projection portion which is elastically deformed when the plunger portion is fitted, and which prevents the falling portion after the fitting portion is assembled. Since the earth leakage trip device is configured, the earth leakage trip device can be easily unitized, and an inexpensive earth leakage trip device can be obtained.

The relationship between the display button fitting cylinder portion and the fitted leakage display button is set so that it can slide in a line contact state.
Since the cross-sectional shapes of the display button fitting cylinder and the earth leakage display button are set, a highly reliable earth leakage trip device can be obtained in which friction due to sliding can be reduced and operation inhibition due to dust or the like is prevented.

The test button has a holding frame portion formed so as to hold both side surfaces of the bottom portion and the lower side portion of the substantially U-shaped contactor, and a holding frame portion inserted into the U-shaped center. A holding plug for sandwiching the contactor is provided together with the portion, and a U-shaped contactor is attached to this test button, so that a balanced contact state with the contact terminal can be obtained. Further, since the contact terminal and the contact come into contact with each other by rubbing against each other, even if the contact surface is soiled, this soiling can be removed and stable contact can be obtained, and a highly reliable earth leakage trip device can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view of an earth leakage trip device according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of an earth leakage trip device according to an embodiment of the present invention.

FIG. 3 is a side view showing a normal state in a relationship between an earth leakage trip electromagnet portion and an earth leakage display button portion of FIG. 1.

FIG. 4 is a side view showing a trip state in relation to the leakage trip electromagnet portion and the leakage display button portion of FIG. 1.

5 is an explanatory diagram showing the relationship between the plunger portion 35 and the elastic protrusion portion 21g of FIG. 1. FIG.

6A and 6B are views showing a test switch portion of an earth leakage trip device according to an embodiment of the present invention, wherein FIG. 6A is a sectional view and FIG. 6B is an exploded perspective view.

7A and 7B are diagrams for explaining the operation of the test switch unit in FIG. 6, in which FIG. 7A shows a normal state, FIG. 7B shows a state in which a test button is pressed down, and FIG. 7C shows an operation in a tilted state.

FIG. 8 is a cross-sectional view showing the relationship between the display button fitting cylinder portion and the leakage display button.

FIG. 9 is a perspective view showing a state in which the cover of the earth leakage breaker of the present invention is removed.

FIG. 10 is a perspective view showing a state in which a cover of the earth leakage breaker of the present invention is partially broken.

FIG. 11 is an internal circuit diagram of an earth leakage breaker.

FIG. 12 is a cross-sectional view of a conventional earth leakage trip device.

[Explanation of symbols]

 1 Base 2 Cover 3 Retractable Handle 5 Overcurrent Tripping Device 6 Electronic Circuit Part for Leakage Tripping 7 Zero-Phase Current Transformer 20 Leakage Tripping Device 21 Storage Case 21a Electromagnetic Fitting Recess 21b Test Switch Fitting Tube 21c Display button fitting cylinder 21d Interphase insulating wall 30 Leakage tripping electromagnet section 33 Leakage tripping coil 35 Plunger section 40 Test switch section 50 Leakage indicator button section

Claims (6)

[Claims] 1. A leakage trip electromagnet section for exciting a leakage trip coil to shut off an opening / closing mechanism of a main circuit when a leakage current generated in a load circuit is detected by a zero-phase current transformer, and a test button. When is pressed, a pseudo leakage current is applied to the zero-phase current transformer to excite the earth leakage trip coil to shut off the opening / closing mechanism of the main circuit and the earth leakage trip coil. An earth leakage trip device having an earth leakage display button portion that is activated when the earth leakage trip electromagnet portion is operated is provided, and the main circuit is formed in a molded case made of a synthetic resin material and including a base and a cover. In the earth leakage circuit breaker housed together with the opening / closing mechanism, etc., the electromagnet fitting recess, the test switch fitting cylinder and the display button fitting cylinder are separated by a partition, respectively, and are integrally formed of synthetic resin. A leakage trip device is configured by fitting the leakage trip electromagnet section, the test switch section, and the leakage display button section into the case, and the test button and the leakage display button penetrate through the button holes provided in the cover. An earth leakage breaker equipped with an earth leakage trip device so as to be exposed on the surface. 2. A ground leakage trip having a ground fault tripping electromagnet section for exciting a ground fault trip coil to shut off an opening / closing mechanism of a main circuit when a leak current generated in a load circuit is detected by a zero-phase current transformer. In the earth leakage breaker, in which the disconnecting device is housed together with the above-mentioned main circuit opening / closing mechanism in a molded case composed of a base and a cover made of synthetic resin material, a main circuit opening / closing mechanism, an overcurrent trip device and a terminal device are provided. Is arranged on a substantially straight line, and an electronic circuit unit for earth leakage trip is arranged between the overcurrent trip device and the terminal device, and the earth trip device is arranged adjacent to the above-mentioned opening / closing mechanism. The storage case is provided with an interphase insulating wall made of a synthetic resin material, which extends along the side edge of the overcurrent trip device in the direction of the leakage trip electronic circuit section and has a U-shaped groove, Electronic circuit part for tripping the earth leakage An electric leakage breaker in which a lead wire for connecting the electric leakage trip device and the electric leakage trip device is housed in the U-shaped groove. 3. A ground leakage trip having a ground fault tripping electromagnet section for exciting a ground fault trip coil to shut off an opening / closing mechanism of a main circuit when a leak current generated in a load circuit is detected by a zero-phase current transformer. In the earth leakage circuit breaker in which the disconnecting device is housed together with the opening / closing mechanism of the main circuit in a molded case consisting of a base and cover made of synthetic resin material, it is driven by the earth leakage trip electromagnet part in the housing case of the earth leakage trip device. A through hole for the plunger is provided, and when the plunger is fitted into the opening of this through hole, it is elastically deformed when assembled, and after assembly, the elasticity that acts to prevent the plunger from falling off by locking the plunger. An earth leakage circuit breaker having a protrusion. 4. A leakage trip electromagnet section for exciting a leakage trip coil to shut off an opening / closing mechanism of a main circuit when a leakage current generated in a load circuit is detected by a zero-phase current transformer; The earth leakage trip device having an earth leakage display button portion that indicates that the trip coil is activated when the trip coil is excited, and the earth leakage trip device has a molded case including a base and a cover formed of a synthetic resin material. In the earth leakage breaker housed together with the opening / closing mechanism of the main circuit, a display button fitting tubular portion formed in the housing case of the earth leakage trip device, and an earth leakage indicating button fitted in the display button fitting tubular portion. , So that it can slide in line contact,
A leakage breaker, wherein the display button fitting cylinder and the cross-sectional shape of the leakage display button are set. 5. A leakage trip electromagnet section for energizing a leakage trip coil to shut off an opening / closing mechanism of a main circuit when a leakage current generated in a load circuit is detected by a zero-phase current transformer, and a test button. When is pressed, a leakage current trip device having a test switch section that energizes a pseudo leakage current to the zero-phase current transformer and excites the leakage trip coil to shut off the opening / closing mechanism of the main circuit is provided. , In the earth leakage breaker housed together with the opening / closing mechanism of the main circuit in a molded case composed of a base and a cover made of synthetic resin material, in the test switch fitting tubular part formed in the housing case of the earth leakage trip device. The test button fitted with a pair of contact terminals has a U-shaped contact frame and a holding frame part formed to hold both sides of the bottom part and the lower side part of the contact part formed in a substantially U shape. Central part And a holding plug for holding the contactor together with the holding frame portion is provided, and the U-shaped contactor is brought into contact with the pair of contact terminals by pressing the test button. Characteristic earth leakage breaker. 6. A leakage trip electromagnet part for energizing a leakage trip coil to shut off an opening / closing mechanism of a main circuit when a leakage current generated in a load circuit is detected by a zero-phase current transformer, and a test button. When is pressed, a leakage current trip device having a test switch section that energizes a pseudo leakage current to the zero-phase current transformer and excites the leakage trip coil to shut off the opening / closing mechanism of the main circuit is provided. In the earth leakage breaker housed together with the main circuit opening / closing mechanism in a molded case consisting of a base and a cover made of synthetic resin material, fit an electromagnet fitting recess into which an electromagnet is fitted and a test switch into which a test switch is fitted. Part of the partition wall that separates the insert cylinder part,
It is formed by the flange part of the bobbin of the leakage trip electromagnet part that is fitted in the recess for fitting the electromagnet, and one end of the lead terminal for the electromagnet coil provided in this flange part is configured to be one contact terminal of the test switch. Leakage breaker characterized by.