KR100937296B1 - Earth Leakage Breaker - Google Patents

Abstract

The present invention is intended for an earth leakage circuit breaker united in the same size as the circuit breaker for wiring, and can be equipped with a breakdown voltage test switch on the circuit breaker main body without changing various functional parts and layouts standardly equipped in conventional products. As a means for this purpose, in a circuit leakage circuit breaker having a monolithic structure in which the main body casing includes the overcurrent protection and the ground fault protection, the power supply circuit wired between the circuit breaker main circuit and the ground fault detection circuit is turned on. Electrode piece which always becomes a closed contact inside the switch case made of an insulating material which is equipped with the switch 21 for manual withstand voltage OFF / OFF and which combined the case 22 and the slide cover 23 with the switch. (24) and the operation piece 23a of the insulator which moves according to the slide operation of a cover, and turns ON / OFF the said contact is provided. Insert the electrode piece into the power supply line of the ground fault detection circuit, connect the electrode piece, and place the operation knob 25 provided on the cover so as to face the window hole of the circuit breaker main body case. Switch on / off by operation from.

Main circuit, main circuit contact, switch mechanism part, operation handle, overcurrent removal device

Description

Earth Leakage Breaker             

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is an explanatory view of the operation of the withstand voltage test switch according to the first embodiment of the present invention.

2 is a configuration diagram of the switch for withstand voltage test of FIG. 1, (a) is an exploded perspective view, (b) is a sectional view of the cover, (c) is an external perspective view of the assembled state.

3 is an assembly structure diagram of an earth leakage breaker equipped with a switch for voltage test of FIG.

4 is a circuit diagram of the circuit breaker of FIG. 3.

5 is a configuration diagram of a switch for withstand voltage test according to a second embodiment of the present invention, wherein (a) and (b) are an external perspective view and an exploded perspective view of an assembled state, respectively.

6 is a configuration diagram of a switch for withstand voltage test according to Embodiment 3 of the present invention, (a) is an exploded perspective view showing main parts of a switch, and (b) is a perspective view of a cartridge.

7 is a conventional circuit diagram of an earth leakage breaker as an object of the present invention.

FIG. 8 is a cross-sectional view illustrating the circuit breaker of FIG. 7. FIG.

9 is a perspective view showing the internal structure of FIG.

(Explanation of symbols for the main parts of the drawing)

1: Main circuit 2: Main circuit contact                 

3: opening and closing mechanism part 4: operation handle

5: overcurrent removal device 6: video current transformer

7: earth leakage detection circuit 7a: printed circuit board

8: earth leakage eliminator 9: power line

11: body case 11a: lower case

11b: upper cover 21: withstand voltage switch

22: case 23, 27: case cover

23a: operation piece 24, 28, 31: electrode piece

24: contact 25, 30a: operation knob

26: cassette case 29, 32: bridge contact

30: Cartridge

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an earth leakage circuit breaker having overcurrent protection and earth protection functions applied to a low voltage power distribution system. It is related with the assembly structure of the switch.

(Conventional technology)                         

Circuit breakers and earth leakage breakers are well known as protection devices for low voltage distribution systems, and current leakage circuit breakers, which are currently used in Korea, are generally constructed by assembling both an overcurrent protection component and a ground protection component in a main body case. In addition, in recent earth leakage circuit breakers, in order to increase the convenience of use on the demand side, a unit body configured to unify the external sizes of the circuit breakers and earth leakage circuit breakers of the same frame, and to share the main parts to be assembled in the main body case as much as possible. The structure is mainstream (for example, refer patent document 1).

Next, the circuit diagram of the above-mentioned earth leakage breaker (for a three-phase power supply) is shown in FIG. 7, and the assembling structure thereof is shown in FIGS. 8 and 9. First, in Fig. 7, reference numeral 1 denotes a main circuit on R, S and T, reference numeral 2 denotes a main circuit contact, reference numeral 3 denotes an opening and closing mechanism of the main circuit contact 2, reference numeral 4 denotes an operation handle and reference numeral 5 denotes a main circuit. It is an overcurrent removal device that trips the switchgear by detecting flowing overload current and short circuit current.

In addition, the earth leakage eliminating device which detects the ground fault of the power distribution system and trips the circuit breaker includes an image current transformer which detects an unbalanced current of the main circuit 1 using the main circuit 1 of R, S, T phase as a primary conductor. 6), an earth leakage detection circuit (electronic circuit including an IC) 7 that detects the ground generation from the secondary output level of the video current transformer 6, and an output from the earth leakage detection circuit 7 to receive an open / close mechanism ( It consists of the trip coil unit 8 which trips 3). Here, the ground fault detection circuit 7 supplies power between phases of the main circuit 1 through the power supply line 9 and the rectifier circuit 10 internally wired between the main circuit 1 and the control power supply. have. In the illustrated example, the phase-to-phase voltage of the R-T phase of the main circuit 1 is supplied to the ground fault detection circuit 7, but the voltages of the respective phases of the R, S, and T phases may be converted into direct current.

8 and 9, reference numeral 11 denotes a main body case composed of a lower case 11a and an upper cover 11b, reference numerals 12 and 13 denote main circuit terminals on the power supply side and load side, and reference numeral 14 denotes a main circuit contact (2). ), A reference numeral 15 denotes a movable contactor, a reference numeral 16 denotes a pivotal contact holder that supports the movable contactor 15, and a reference numeral 17 denotes an arc extinguishing device. Further, the opening / closing mechanism part 3, as is well known, is a toggle link mechanism and a latch 18 in which a toggle link 3a and an opening / closing spring 3b in combination between the contact holder 16 and the operation handle 4 are combined. ), A latch support 19, and an assembly with a latch mechanism in which the trip crossbar 20 is combined, and the trip crossbar 20 includes an armature 5a, which is an operation end of the overcurrent removal device 5, and an electric leakage removal. The slider (not shown) which is the operation end of the trip coil unit 8 of an apparatus opposes. In addition, the latch mechanism shown has shown an example, The latch mechanism of various structures is known besides this.

As shown in Fig. 9, the main body case 11 is provided with an interphase partition 11c to insulate and insulate the components of each phase assembled in the main body case, and the earth leakage detection circuit 7 described above includes an IC or the like. Electronic components of the main circuit case 1 are mounted on the printed circuit board 7a, and then embedded in the interior of the main body case 11 (the space between the sides of the video current transformer 6 and the side walls of the lower case 11a). The power supply line 9 (refer FIG. 7) is wired between the conductors of ().

Opening / closing operation of the earth leakage breaker is well known. When the operation handle 4 is moved to the ON and OFF positions, the toggle link mechanism of the opening / closing mechanism part 3 is inverted in association with the operation handle 4, The movable contact 15 opens and closes. In addition, in the shown closing state in which the main circuit contact 2 is closed (ON), the latch 18 is caught by the latch receiver 19, and the latch receiver 19 is restrained by the trip crossbar 20 at this position. It is. In this state, when the overcurrent and short circuit current flows to the main circuit and the overcurrent removing device 5 is operated, the trip crossbar 20 rotates counterclockwise through the armature 5a, and the latch receiver 19 and the latch ( Release engagement with 18). As a result, the opening and closing mechanism 3 trips, and the movable contact 15 is separated from the fixed contact 14 to cut off the current in the main circuit. Similarly, when the ground current flows to the main circuit 1 of FIG. 7 and the trip coil unit 8 of the earth leakage removing device is operated, the trip crossbar 20 is driven to the release position. As a result, the open / close mechanism 3 trips, and the movable contact 15 opens to disconnect the main circuit 1 similarly to the operation caused by overcurrent. In addition, to re-insert the breaker after the trip operation, the operation mechanism 4 stopped at the trip position is returned from the trip position to the OFF position once, the latch mechanism is reset, and the operation handle 4 is moved from the OFF position to the ON position again. By moving, the movable contact 15 is closed.

By the way, as for the product of an earth leakage breaker, it is prescribed | regulated by the standard to ensure predetermined | prescribed dielectric strength, and for that reason, a breakdown voltage test is performed for every product and it confirms that a breakdown does not occur. This withstand voltage test is performed by applying a test voltage between the phases of the main circuit terminals with the main circuit contact of the earth leakage breaker at 0FF. The test voltage is prescribed for each rated voltage of the earth leakage breaker. The test voltage at the circuit breaker with a rated voltage of 400 V to 600 V is 2500 V.

When this withstand voltage test is carried out, when the earth leakage detection circuit (IC) 7 shown in FIG. 7 is tested in the assembled state of the product connected to the main circuit 1, the test is applied between phases of the main circuit 1. The high test voltage is applied to the ground fault detecting circuit 7 and the IC and the like are destroyed. Therefore, the current state of the breaker manufacturers in Korea is to perform the withstand voltage test in the assembling stage before connecting the power supply line 9 that feeds the ground fault detection circuit 7 to the main circuit 1.

On the other hand, the earth leakage breaker produced in Gumi and other countries is different from the domestic product of the above-mentioned single structure, and the unit is equipped with an independent earth leakage detection unit (video current transformer, earth leakage detection circuit, etc.) with a separate structure to the wiring breaker. It is common to use a combination). Also, the above-described withstand voltage test is provided with a withstand voltage test switch in the ground fault detection unit so that the withstand voltage test can be performed in a state of use in which the earth leakage detection unit is assembled in the circuit breaker. The earth leakage detection circuit is disconnected from the main circuit of the circuit breaker by the OFF operation, and after the end of the withstand voltage test, the breakdown voltage test switch is operated by 0N to connect the earth leakage circuit to the main circuit to return it to the normal use state. See Patent Document 2).

[Patent Document 1]

Japanese Patent No. 3246562

[Patent Document 2]                         

United States Patent Application Publication No. 2001 / 0022713A1

As described above, the earth leakage breaker currently shipped to the domestic market does not assume that the user side is subjected to the withstand voltage test after the product is shipped. However, for a product that has obtained overseas standard recognition, the equipment of the withstand voltage test switch is required in order to be able to cope with the withstand voltage test performed locally in the destination country.

By the way, the earth leakage breaker of the unitary structure shown in FIG. 8, FIG. 9 is fully assembled in the main body case, without the common space with the circuit breaker and the functional parts of an earth leakage protection. For this reason, it is necessary to change the components and layout of the conventional products in terms of design, in order to secure a new space in which the withstand voltage test switch is incorporated without changing the external size of the main body case (unified to the same size as the case of the circuit breaker). There is a problem that takes enormous development costs and time.

Accordingly, an object of the present invention is to provide a unitary circuit leakage circuit breaker equipped with an overcurrent protection and an earth leakage protection function component in a main body case having the same size as the circuit breaker for wiring. The present invention provides an earth leakage breaker that is equipped with a switch for withstand voltage test and can easily cope with the withstand voltage test performed after the product is shipped without changing the layout thereof.

(Means to solve the task)

In order to achieve the above object, according to the present invention, a ground fault of a unitary structure in which a ground fault removal device including a ground fault detection circuit including a main circuit contact, a contact opening / closing mechanism, an operation handle, an overcurrent removal device, and an image current transformer in a main body case is assembled. A circuit breaker is provided with a manual voltage test switch for turning on / off a power supply circuit built in the main body case and internally wired between a main circuit and a ground fault detection circuit. It shall be configured as described above.

(1) The pair of two pieces facing each other inside the switch case made of insulating material in which the case and the slide cover are combined in pairs, and the electrode piece having a monopole contact point always added to the closed position and the slide operation of the cover. And an operation piece of an insulator for turning on / off the contact of the electrode piece. The electrode piece is inserted into and connected to a power supply circuit between the main circuit and the ground fault detection circuit. It is arrange | positioned facing the window hole opened to the main body case of a circuit breaker (claim 1).

In the above-described configuration, in normal use, the contacts of the electrode pieces of the withstand voltage test switch overlap each other, and the voltage between the phases of the main circuit is supplied to the ground fault detecting circuit. On the other hand, if the operation knob of the switch is pulled out to the OFF position manually from the window hole opened in the case of the breaker main body during the breakdown voltage test, the operation piece of the insulator provided in the case cover is inserted between the electrode pieces, thereby The circuit is separated, and the ground fault detection circuit is disconnected from the main circuit. This can safely protect the ground fault detection circuit from the withstand voltage test applied voltage.

In addition, since the contacts of the electrode pieces are held in the open position by sandwiching the operation pieces of the insulator in the switched off state, it is not necessary to secure an insulation distance corresponding to the test voltage in advance between the electrode pieces. The switch can be miniaturized and assembled into a small space in the breaker body case.

(2) An insulating case comprising a cassette case on which a printed circuit board of a ground fault detection circuit is mounted, and a case cover for storing the cassette case, and an electrode having a single-pole contact disposed on an opposite surface of the cassette case and the case cover. The electrode piece is inserted into and connected to the feeder circuit between the main circuit and the ground fault detection circuit, and the operation end of the cassette case is faced by the window hole opened in the main body case of the breaker. To allow access to the ON and OFF positions (claim 2).

In the above-described configuration, in the normal use state in which the cassette case is pushed into the ON position, the pair of electrode pieces are brought into contact with the entangled contactor, and the voltage between the phases of the main circuit is supplied to the ground fault detection circuit. On the other hand, if the operation end of the cassette case is taken out to the 0FF position from the case opening window hole of the circuit breaker main body during the breakdown voltage test, the contact of the electrode piece and the entangled contact are separated, and the ground fault detection circuit is disconnected from the main circuit.                         

In addition, by using the printed circuit board of the earth leakage detection circuit which is equipped as a standard for the earth leakage breaker, and combining the cassette type switch case and the contact mechanism, the switch for the breakdown voltage test is constituted without changing the main parts and layout of the earth leakage breaker. In addition, space-saving switch for withstand voltage test can be additionally equipped.

(3) An electrode piece having an electrode piece with a single-pole contact disposed on a printed circuit board of the ground fault detection circuit, and an operation handle with an entangled contactor opposed to the contact of the electrode piece. Is inserted into and connected to a power supply circuit between the ground fault detection circuit and the cartridge is disposed in such a manner that the operation knob of the cartridge faces the window hole opened in the main body case of the circuit breaker (claim 3).

In the above configuration, in the normal use state in which the cartridge is pushed to the ON position, the pair of electrode pieces provided on the printed circuit board of the ground fault detection circuit is in contact with the tangential contact of the cartridge, and the switch contact is turned ON, and the phase voltage of the main circuit is Power is supplied to the ground fault detection circuit. On the other hand, if the operation knob of the cartridge is taken out to the OFF position from the window hole of the circuit breaker main body case during the breakdown voltage test, the contact of the electrode piece and the entangled contact are separated, and the short circuit detecting circuit is disconnected from the main circuit.

In addition, similar to the preceding paragraph (2), by using the printed circuit board of the earth leakage detection circuit which is equipped as a standard with the earth leakage breaker, and combining the contact mechanism of the cartridge with an operation knob and the switch, the earth leakage breaker is comprised. It is possible to equip additional equipment with space-saving switch for the withstand voltage test without changing the main parts and layout.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described based on the Example shown to FIGS. In addition, in the figure of an Example, the member corresponding to FIGS. 7-9 is attached | subjected with the same code | symbol, and the detailed description is abbreviate | omitted.

Example 1

First, an embodiment corresponding to claim 1 of the present invention will be described with reference to FIGS. That is, as shown in FIG. 3, a space between the side surface of the video current transformer 6 and the side wall of the lower case 11a, that is, the c-shaped conductor of the primary conductor passing through the video current transformer, is inside the main body case of the ground fault circuit breaker. Between the manual-operation type withstand voltage test switch 21 which reviews the detailed structure in between (space where one printed circuit board 7a of the ground fault detection circuit was arrange | positioned in FIG. 9), this switch withstand voltage test 21 ) Is inserted into the power supply line 9 which is internally wired between the main circuit 1 and the ground fault detection circuit 7, as shown in the circuit diagram of FIG. (21) is turned OFF to disconnect between the ground fault detecting circuit 7 and the main circuit 1.

Next, the assembling structure of the withstand voltage test switch 21 is shown in Figs. 2 (a) to 2 (c), and the opening / closing operation of the switch is explained with reference to Figs. 1 (a) and 1 (b). . First, in FIGS. 2 (a) to 2 (c), the withstand voltage test switch 21 is a sliding cover fitted to a case (expectation) 22 made of a resin molded product (insulation) and the case 22. In the box-shaped switch case in which (23) is combined, an electrode piece, an opening / closing operation piece, and an operation knob as described below are provided. That is, the electrode piece 24 is assembled in the case 22 so that the two pieces are paired with each other, and the contacts 24a at the tip end thereof contact each other, and the electrode is formed as a rib-shaped protrusion in the longitudinal direction at the inner center of the cover 23. The opening / closing operation piece 23a inserted between the pieces 24 is integrally molded, and the operation handle 25 is fitted to the tip of the cover 23 so as to be joined. Here, the electrode piece 24 is made of a conductive material having a spring property such as phosphor bronze, and the tip is bent into a "b" shape, the contact point 24a is provided therein, and assembled to the case 22. In one state, the contacts 24a are brought into contact with each other to always form a closed contact. 3, one of the electrode pieces 24 is connected to the main circuit 1 via the power supply line 9 shown in FIG. 9 in a state of being embedded in the lower case 11a of the main body case. The other electrode piece 24 is connected to the power supply terminal of the ground fault detection circuit 7 via the rectifier circuit 10, and the operation knob 25 is opened in the upper cover 11b of the circuit breaker main body case. It faces one window hole 11b-1.

In the above-described configuration, in the state of the switch 0N in which the operation knob 25 is pushed downward as shown in FIG. 1A, the operation piece 24a formed inside the cover 23 has a pair of left and right electrode pieces ( It retreats to the position which does not interfere with 24, and the contact 23a contacts with the spring elasticity of the electrode piece itself. In this state, as shown in FIG. 1 (b), when the operation knob 25 is pulled upward, the operation piece 23a of the cover 23 moves upward to move upward from the retracted position so as to move upward. ) And the power supply circuit to the ground fault detection circuit 7 (see FIG. 9) is disconnected between the contacts 24a. In this switch-off state, the operation piece 23a is sandwiched between the pair of electrode pieces 24 as the insulating partition wall to open the contact 24a, so that a short circuit is detected with respect to the test voltage applied during the breakdown voltage test. The circuit can be protected safely.

The switch 21 for withstand voltage test of the illustrated embodiment stores a pair of electrode pieces 24 in the switch case to form a contact for one pole, but as shown in FIG. In the case where the power supply circuit is formed of three power supply lines 9, three pairs of electrode pieces are arranged horizontally in the switch case.

Example 2

Next, an embodiment corresponding to the second aspect of the present invention is shown in Figs. 5 (a) and 5 (b). In this embodiment, in the assembling structure of the ground fault circuit breaker shown in Fig. 9, the breakdown voltage test is performed using the printed circuit board 7 of the ground fault detection circuit which is arranged in the main body case 11 in the horizontal direction of the video current transformer 6. The main body case is equipped with a switch for the withstand voltage test without adding a switch and occupying an extra space.

5 (a) and 5 (b), the withstand voltage test switch 21 includes a drawer-type cassette case 26 on which the printed circuit board 7a of the ground fault detection circuit 7 (see FIG. 4) is mounted. Two pieces which are taken out from the printed circuit board 7a and placed on the bottom surface of the cassette case 26 in an insulating case in which the case cover 27 provided on the main body case side is stored so as to store the cassette case 26. It consists of the electrode piece 28 which has the contact of a single pole made into a pair, and the entanglement contactor 29 provided in the inner surface (bottom surface) of the case cover 27, facing the contact of the electrode piece 28. As shown in FIG. In addition, the cassette case 26 forms the groove 26a so that the upper end of the case is an operation end, for example, a screwdriver (for negative screws) is inserted therein to manually pull the cassette case to the OFF position, and the case cover The lid 27a adheres to the front surface 27.

In order to assemble the above-described breakdown voltage test switch 21 into an earth leakage breaker, the electrode piece 28 is connected between the main circuit and the earth leakage detection circuit as in the first embodiment via the printed circuit board 7a of the earth leakage detection circuit. Connected to the power supply line 9 (refer to FIG. 4) wired to the upper end of the cassette case 26 so as to face the window hole 11b-1 opened in the upper cover 11b of the circuit breaker main body. Place it in the OFF position to allow access.

In such a configuration, in the state where the cassette case 26 is pushed into the window hole, the electrode piece 28 contacts the entanglement contactor 29 to be switched on. When the withstand voltage test is carried out in this state, a negative driver is inserted into the groove 26a of the cassette case 26 as a preparation operation, and the cassette case is pulled upward from the window hole 11b-1 of the breaker body case. As a result, the electrode piece 28 is separated from the tangential contact 29, and the withstand voltage test switch 21 is turned OFF, so that the power supply circuit between the ground fault detecting circuit 7 and the main circuit 1 (see FIG. 4) is closed. To be disconnected. When the withstand voltage test is performed in this state and the cassette case 26 is pushed to the 0N position after the end of the test, the switch is set to 0N and returns to the normal use state.

In the illustrated example, two sets of contacts are provided on the printed circuit board 7a. However, in the case where the power supply circuit of the ground fault detection circuit 7 is formed of three power supply lines 9 as shown in FIG. The electrode pieces and the contactor contacts. In the switch for withstand voltage test of the illustrated example, the electrode piece 28 is provided on the cassette case 26 side, and the entangled contactor 29 is provided on the case cover 27 side. The 28 may be arranged on the case cover 27 side, and the entangled contact 29 may be arranged on the cassette case 26 side.

According to this embodiment, a function of assembling the earth leakage breaker is achieved by using a printed circuit board of the earth leakage detection circuit standardly equipped with the earth leakage breaker, and combining this with a cassette type switch case and a contact mechanism to construct a switch for a breakdown voltage test. Space-saving switches for withstand voltage can be retrofitted without changing components and their layout.

Example 3

Next, an embodiment corresponding to the third aspect of the present invention will be described with reference to Figs. 6 (a) and 6 (b). In this embodiment, the cartridge 30 with the operation knob is combined with the printed circuit board 7a of the ground fault detection circuit, and then the electrode piece 31 having a single-pole contact is provided on the printed board 7a. ), An entangled contact 31 is provided in the cartridge 30 so as to constitute the withstand voltage test switch 21.

Here, the cartridge 30 has a structure in which the entangled contactor 32 is attached to a rod-shaped resin molded product (insulation material) in which the operation handle 30a is integrally formed on the upper end, and the case in which the printed circuit board 7a is mounted (not shown). After slidably guide support, the operation knob 30a is arranged to be pulled out so as to face the window hole 11b-1 (see FIG. 3) opened in the cover of the circuit breaker main body case in the same manner as the above embodiment. have. Then, in the state where the circuit breaker is assembled, the power supply line in which the electrode piece 31 provided on the printed circuit board 7a is wired between the ground fault detecting circuit 7 and the main circuit 1 as shown in FIG. Insert into 9) and connect. Reference numeral 30b denotes a screw seat for screwing the operation knob 30a to the circuit breaker main body case to lock the withstand voltage test switch in the 0N state.

In the above configuration, in a state where the cartridge 30 is inserted into the window hole of the breaker body case and pushed into the ON position, the entangled contact 32 contacts the electrode piece 31 to feed the electric leakage detection circuit and the main circuit. A circuit is formed. On the other hand, in carrying out the withstand voltage test, when the cartridge 30 is pulled out from the circuit breaker main body, the entangled contact 32 is separated from the electrode piece 31 to disconnect the power supply circuit between the ground fault detection circuit and the main circuit. As a result, the withstand voltage test can be safely performed. In addition, after completion of the test, the cartridge 30 is inserted to return to the normal use state. In addition, if the operation knob 30a is screwed in this state, it is possible to prevent an operation miss that disconnects the power supply circuit of the ground fault detection circuit by mistake. In this embodiment, although two sets of contacts of the withstand voltage test switch are provided, three sets of contacts can be provided in the same manner as in the second embodiment to correspond to the circuit of Fig. 4 (three power lines 9). .

As described above, according to the configuration of the present invention, a switch for withstand voltage test is added without changing the overload protection, the earth leakage protection function component and its layout which are unified to the same size as the wiring breaker and assembled in the main body case. It is also possible to equip and withstand the withstand voltage test performed after shipment of the earth leakage breaker by disconnecting the ground fault detection circuit from the main circuit by turning OFF the breakdown voltage test switch.

According to the configuration of claim 1, it is possible to obtain a switch for withstand voltage test having a small size and high insulation performance, and employing the arrangements of claims 2 and 3 in which the switch for withstand voltage test is constructed in combination with the printed circuit board of the ground fault detection circuit. By doing so, space saving can be achieved.

Claims (3)

In a single-circuit earth leakage circuit breaker comprising a main circuit contact unit, a contact opening / closing mechanism, an operation handle, an overcurrent removal device, and an earth leakage removal device including a leakage detection circuit combined with an image current transformer, It is equipped with a manual operation voltage test switch for turning on / off a power supply circuit internally wired between the main circuit and the ground fault detection circuit built in the main body case. Insulator for turning on / off the contacts of the electrode piece by moving the electrode piece with a single pole contact, which is always added to the closed position, in a switch case made of an insulator in pairs, and the slide of the cover. In this configuration, the electrode piece is inserted into the feed circuit between the main circuit and the ground fault detection circuit to be connected, and then the operation knob provided on the slide cover faces the window hole opened in the main body case of the breaker. An earth leakage breaker, characterized in that the arrangement. In a single-circuit earth leakage circuit breaker comprising a main circuit contact unit, a contact opening / closing mechanism, an operation handle, an overcurrent removal device, and an earth leakage removal device including a leakage detection circuit combined with an image current transformer, Equipped with the main body case and equipped with a manual operation voltage test switch for turning on / off the power supply circuit internally wired between the main circuit and the earth leakage detection circuit, and equipped with a printed circuit board of the earth leakage detection circuit. Insulation case comprising a cassette case and a case cover for storing the cassette case, an electrode piece having a single pole contact and a bridge contact, which are disposed to be disposed on the opposite surface of the cassette case and the case cover. The electrode piece is inserted into and connected to the power feeding circuit between the main circuit and the ground fault detecting circuit, and the operation end of the cassette case is faced by a window hole opened in the main body case of the circuit breaker to allow access to the ON and OFF positions. An earth leakage circuit breaker, characterized in that the arrangement. In a single-circuit earth leakage circuit breaker comprising a main circuit contact unit, a contact opening / closing mechanism, an operation handle, an overcurrent removal device, and an earth leakage removal device including a leakage detection circuit combined with an image current transformer, Equipped with the main body case and equipped with a manual operation voltage test switch for turning on / off the power supply circuit internally wired between the main circuit and the earth leakage detection circuit, and placing the corresponding voltage test switch on the printed circuit board of the earth leakage detection circuit. It consists of an electrode cartridge having an electrode contact with a single pole contact, and an insulated cartridge having an operation knob with an interlocking contact opposing the contact of the electrode piece. The electrode piece is inserted into a power supply circuit between the main circuit and the ground fault detection circuit. And the operation knob of the cartridge is arranged to be pulled out so as to face the window hole opened in the main body case of the circuit breaker.

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