JP5116582B2 - Earth leakage breaker - Google Patents

Description

  The present invention relates to an earth leakage circuit breaker that interrupts an electric circuit when a leakage or ground fault occurs in an AC circuit, and particularly to the wiring inside the circuit breaker provided with a power circuit that uses a three-phase circuit as a power source and simplification of assembly. Is.

  In the conventional earth leakage breaker, the structure that takes power for the earth leakage detection circuit in the earth leakage breaker is the power supply lead wire of the power supply circuit for the earth leakage detection circuit built in the circuit breaker to detect the leakage current. Are connected to each phase (R, S, T phase) of the primary conductor passing through the zero-phase current transformer by soldering or screwing. (For example, refer to Patent Document 1 and Patent Document 2).

Japanese Unexamined Patent Publication No. 2004-281144 (FIGS. 1 to 10 and its description) Japanese Patent Laid-Open No. 2001-35343 (FIGS. 1-9 and description thereof)

  In the conventional earth leakage breaker, the lead wire drawn out from the power supply terminal of the earth leakage detection circuit is connected to the primary conductor penetrating the zero-phase current transformer by soldering or screwing. There are many connecting parts and assembly man-hours for connecting the lead wire to the primary conductor, which makes it difficult to assemble.

  The present invention has been made in order to solve such problems, and it is easy to make an electrical connection between a leakage detection circuit and a primary conductor penetrating a zero-phase current transformer, and a connection component for electrical connection. Another object of the present invention is to obtain an earth leakage circuit breaker that can reduce assembly man-hours and facilitate assembly.

An earth leakage circuit breaker according to the present invention includes a housing composed of an insulating base and an insulating cover formed of a synthetic resin material, a three-phase primary conductor through which a main circuit current that is built in the housing and is opened and closed by a contact flows, A zero-phase current transformer that passes through the primary conductor and detects the leakage current in the load-side main circuit circuit to generate an output signal. The output signal from the zero-phase current transformer is input to detect a leakage in the main circuit circuit on the load side. An earth leakage circuit breaker having an essential component of an earth leakage detection circuit and an open / close mechanism that opens and closes the main circuit contact in response to an output of the earth leakage detection circuit, and an operating power source of the earth leakage detection circuit that contacts the primary conductor be any essential components the leakage breaker mounted on the insulating member of the essential components of the power supply terminals taking, the insulating member is a three-phase interphase insulating and load side of the primary conductor of the three-phase Interphase insulation of external terminals And an insulating member formed in a shape that covers a part of the insulating cover and covers the three-phase primary conductor so that the three-phase primary conductor is not exposed to the outside. A wall plate portion covering the three-phase primary conductor so that the three-phase primary conductor is not exposed to the outside, a primary conductor interphase insulating portion formed at the inner center portion of the wall plate portion, and a lower end of the wall plate portion A load-side external terminal interphase insulating part formed on the power supply terminal and a power supply terminal attaching part for attaching the power supply terminal, and the power supply terminal attached to the power supply terminal attaching part includes the primary conductor and the zero phase change When the insulating member is assembled in the flow device, it contacts the primary conductor, and in a state before the insulating cover is attached to the insulating base, the connection portion of the power supply terminal with the leakage detection circuit is exposed to the outside. Leakage to the exposed connection The leads of detection circuit is mounted is characterized in.

The present invention includes a housing composed of an insulating base and an insulating cover made of a synthetic resin material, a three-phase primary conductor through which a main circuit current that is opened and closed by a contact is built in the housing, and the primary conductor penetrates. A zero-phase current transformer for detecting a leakage current in the load-side main circuit circuit and generating an output signal; an leakage detection circuit for detecting a leakage in the load-side main circuit circuit by inputting the output signal from the zero-phase current transformer; And an earth leakage circuit breaker having an open / close mechanism that opens and closes the main circuit contact in response to an output of the earth leakage detection circuit as an essential component, and a power supply terminal that contacts the primary conductor and receives an operating power of the earth leakage detection circuit wherein a one of essential components the leakage breaker mounted on the insulating member of the essential components, wherein the insulating member during phases of a three-phase external terminal of the interphase insulating and load side of the primary conductor of the three-phase Insulating and An insulating member formed in a shape covering a part of the edge cover and covering the three-phase primary conductor so that the three-phase primary conductor is not exposed to the outside, and the insulating member is the three-phase primary conductor A wall plate portion that covers the primary conductor of the three phases so that the conductor is not exposed to the outside, an insulating portion between the primary conductor phases formed at an inner central portion of the wall plate portion, and a lower end portion of the wall plate portion. A load-side external terminal interphase insulating part and a power terminal attaching part for attaching the power terminal, and the power terminal attached to the power terminal attaching part is connected to the primary conductor and the zero-phase current transformer. When an insulating member is incorporated, the primary conductor comes into contact with the insulating cover, and before the insulating base is attached to the insulating base, the connection portion of the power terminal with the leakage detection circuit is exposed to the outside, and the exposed connecting portion Lead to the leakage detection circuit Since is mounted, the electrical connection between primary conductors passing through the leakage detection circuit and ZCT easily performed, electrically reducing connecting parts and assembly steps for connecting, enabling the assembled easily leak There is an effect that a circuit breaker can be obtained.

Embodiment 1 FIG. Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a longitudinal front view showing the internal structure of the leakage breaker, and FIG. 2 is an exploded view of the assembly portion of the zero-phase current transformer and the primary conductor and the insulating member portion of the leakage detection section viewed from the left. FIG. 3 is an exploded perspective view, FIG. 3 is an exploded perspective view of a state in which the assembly portion of the zero-phase current transformer and the primary conductor and the insulating member portion are disassembled, and FIG. For example, it is a perspective view showing power terminals of an R phase and a T phase (an intermediate phase is an S phase). In each figure, the symbol R means R phase, S means S phase, and T means T phase.

  In FIG. 1, reference numeral 10 denotes a ground fault circuit breaker, which includes an insulating base 11 and an insulating cover 12, and both the insulating base 11 and the insulating cover 12 are made of synthetic resin. Reference numeral 13 denotes a power supply side three-phase (R phase, S phase, T phase) external terminal fixed to the insulating base 11. The external terminal 13 is shown only for one phase in FIG.

Reference numeral 14 denotes a fixed contact, to which a fixed contact 14a is fixed. Reference numeral 15 denotes a movable contact disposed so as to face the fixed contact 14, and a movable contact 15 a that contacts and separates from the fixed contact 14 a is fixed thereto. An arc extinguishing device 16 has a plurality of arc extinguishing plates 17. A handle 18 is connected to the movable contact 15 so as to be interlocked with the movable contact 15.
Note that the fixed contact 14, the fixed contact 14 a, the movable contact 15, and the movable contact 15 a are also shown in FIG. 1 for only one phase among the three phases.

  The stationary contact 14, the movable contact 15, the arc extinguishing device 16, the handle 18, and the like constitute a circuit breaker breaking mechanism 100. An electromagnet in response to the output of a leakage detection circuit that determines the level of leakage in the main circuit circuit on the load side based on the output level of the output signal from the zero-phase current transformer 22 to be described later and determines whether or not the operation sensitivity has been reached. An opening / closing mechanism 300 such as a toggle mechanism that is operated by the device 200 (see FIGS. 6 and 7) and opens and closes the contacts 14a and 15a via the movable contact 15 is an electromagnetic device 200, which is another essential component. Along with the breaker mechanism 100 and the like, it is built in the casing 10 of the earth leakage breaker which is one of the essential components. The leakage detection circuit itself is a known circuit (usually an electronic circuit) and is not shown in the first embodiment. For example, the leakage detection circuit is built in the electromagnet device 200 in FIGS. 6 and 7 together with an electromagnet (not shown). What is necessary is just to be the structure to do.

  2 and 3, 19R, 19S, and 19T are three-phase external terminals on the load side, 20 is an overcurrent tripping mechanism that trips the circuit when an overcurrent flows in the main circuit circuit, and 21R, 21S, 21T is a three-phase primary conductor. As shown in FIG. 2, each of them passes through a through-hole 22a of a zero-phase current transformer 22 described later, and both are shown before and after the zero-phase current transformer 22. It has a shape bent into a predetermined shape, one end is formed integrally with the load-side three-phase external terminals 19R, 19S, and 19T for each phase, and the other end is connected to the overcurrent tripping mechanism 20. . A plane portion 21a is provided on the surface of the three-phase primary conductors 21R and 21T on the side opposite to the zero-phase current transformer 22, and the plane of the three-phase primary conductor 21S on the side opposite to the zero-phase current transformer 22 is planar. A portion 21b is provided.

Reference numeral 23 denotes an insulating member, which insulates the three-phase primary conductors 21R, 21S, and 21T and the load-side three-phase external terminals 19R, 19S, and 19T, and also provides an insulating cover 12 for the earth leakage breaker. This is an integrally molded product made of synthetic resin that is molded into a shape that covers the three-phase primary conductors 21R, 21S, and 21T so that the three-phase primary conductors 21R, 21S, and 21T are not exposed to the outside.
As illustrated in FIGS. 2 and 3, the insulating member 23 includes a wall plate portion 231 that covers the three-phase primary conductors 21R, 21S, and 21T so that the three-phase primary conductor 21 is not exposed to the outside. Insulation portion 232 between the primary conductors formed in the shape of an I-shaped steel at the inner center of the portion 231, the load side external terminal interphase insulation portion 233 formed at the lower end of the wall plate portion 231, and a leakage detection circuit (not shown) And a power supply terminal mounting portion 234 for mounting a power supply terminal (described later).

  The primary conductor interphase insulating part 232 of the insulating member 23 includes an upper side part 2321, a lower side part 2322, and an intermediate connection part 2323 that connects the upper side part 2321 and the lower side part 2322.

  The intermediate connection portion 2323 is inserted into the gap between the left and right primary conductors 21R and 21T in the zero-phase current transformer through hole 22a, and the upper side portion 2321 penetrates the left and right primary conductors 21R and 21T and the zero-phase current transformer. The lower side portion 2322 is inserted into the gap between the inner wall surface of the hole 22a, and the lower side portion 2322 is inserted into the gap between the left and right primary conductors 21R and 21T and the intermediate primary conductor 21S.

  Further, the intermediate connection portion 2323 is inserted into the gap between the left and right primary conductors 21R and 21T in the zero-phase current transformer through-hole 22a, whereby interphase insulation between the primary conductors 21R and 21T is performed, and the lower side portion By inserting 2322 into the gap between the left and right primary conductors 21R and 21T and the intermediate primary conductor 21S, interphase insulation between the primary conductors 21R and 21T and the intermediate primary conductor 21S is performed.

  Further, the intermediate connection portion 2323 is inserted into the gap between the left and right primary conductors 21R and 21T in the zero-phase current transformer through hole 22a, and the upper side portion 2321 penetrates the left and right primary conductors 21R and 21T and the zero-phase current transformer. The lower conductor 2232 is inserted into the gap between the left and right primary conductors 21R, 21T and the intermediate primary conductor 21S by inserting the gap between the inner wall surface of the hole 22a and the primary conductors 21R, 21S, 21T. The relative positioning is performed and the relative displacement of the primary conductors 21R, 21S, and 21T is prevented.

  The insulating member 23 constitutes a part of the insulating cover 12 by inserting the primary conductor interphase insulating portion 232 between the phases of the primary conductors 21R, 21S, and 21T.

  Concavities and convexities are formed in the load side external terminal interphase insulating portion 233, and convex portions on both sides of each concave portion corresponding to each phase serve for interphase insulation, and each concave portion corresponding to each phase has a corresponding load side external portion. Three-phase external terminals 19R, 19S, and 19T are inserted.

  Further, as shown in FIGS. 2 and 3, the insulating member 23 is in contact with the power supply terminals 24R and 24T and the middle pole 21S that are in contact with the left and right poles 21R and 21T of the primary conductor 21 that supplies power to the leakage detection circuit. A power supply terminal 24S is attached.

  The power supply terminals 24R and 24T that are in contact with the left and right poles 21R and 21T of the primary conductor 21 have the same shape and the same size, and both are illustrated in common in FIG. As shown in FIG. 4, a hole 24Ra (24Ta) for attaching the power supply terminal 24R (24T) to the power supply terminal mounting portion 234 of the insulating member 23, and a contact surface 24Rb (24Tb) in electrical contact with the primary conductor 21R (21T) And a hole 24Rc (24Tc) to which the lead wire 222 drawn out from the leakage detection circuit is connected, and the lead wire 222 of the leakage detection circuit (electronic circuit) can be attached by soldering.

  As shown in FIG. 4, the power supply terminal 24 </ b> S that contacts the intermediate pole 21 </ b> S of the primary conductor 21 includes a hole 24 </ b> Sa that attaches the power supply terminal 24 to the insulating member 23, a contact surface 24 </ b> Sb that is in electrical contact with the primary conductor 21, The hole 24Sc is connected to the lead wire 222 drawn out from the detection circuit.

  In the earth leakage circuit breaker configured as described above, as shown in FIGS. 2 and 3, when the insulating member 23 is incorporated in the primary conductors 21R, 21S, 21T and the zero-phase current transformer 22 in the direction of the arrow, the insulating member The intermediate connection portion 2323 of the primary conductor interphase insulating portion 232 is inserted into the gap between the left and right primary conductors 21R and 21T in the zero-phase current transformer through hole 22a, and the upper side portion 2321 is connected to the left and right primary conductors 21R, 21R, 22T. 21T and the inner wall surface of the zero-phase current transformer through hole 22a are inserted, and the lower side portion 2322 is inserted into the gap between the left and right primary conductors 21R and 21T and the intermediate primary conductor 21S, and the insulating member 23 Power supply terminals 24R and 24T attached to the power supply terminal attachment portion 234 of the left and right poles are in contact with the planar portions 21a on the inner sides of the primary conductors 21R and 21T, and the power supply terminal 24S is in contact with the lower side 21b of the intermediate conductor 21S. To do.

  The intermediate connection portion 2323 of the primary conductor interphase insulating portion 232 of this insulating member is inserted into the gap between the left and right primary conductors 21R and 21T in the zero-phase current transformer through hole 22a, and the upper side portion 2321 is Are inserted into the gap between the primary conductors 21R and 21T and the inner wall surface of the zero-phase current transformer through-hole 22a, and the lower side portion 2322 is inserted into the gap between the left and right primary conductors 21R and 21T and the intermediate primary conductor 21S. The contact surfaces 24Rb and 24Tb of the power supply terminals 24R and 24T attached to the power supply terminal attachment portion 234 of the insulating member 23 come into contact with the flat portion 21a inside the primary conductors 21R and 21T on the left and right poles, and contact with the power supply terminal 24S. When the surface 24Sb is in contact with the lower side 21b of the primary conductor 21S of the medium pole, the state of the holes 24Rc, 24Sc, 24Tc of the power terminals 24R, 24S, 24T ( Connection part) is external Since it is exposed, connection work between the exposed portion and the lead wire 222 of the leakage detection circuit, for example, the tip of the lead wire 222 of the leakage detection circuit is inserted into the holes 24Rc, 24Sc, 24Tc and the power supply terminal 24R is inserted. , 24S, 24T and the corresponding lead wire 222 are easily soldered.

  According to the configuration of the first embodiment, the electrical connection between the three-phase primary conductors 21R, 21S, and 21T and the power supply terminals 24R, 24S, and 24T can be achieved only by incorporating the insulating member 23 into the zero-phase current transformer 22. Therefore, soldering or screwing with the three-phase primary conductors 21R, 21S, and 21T as in the prior art is unnecessary, the number of assembling steps can be reduced, the structure can be simplified, and the assembling workability becomes easy.

  As described above, the earth leakage breaker according to the first embodiment includes a casing made of an insulating base and an insulating cover formed of a synthetic resin material, a contact for opening and closing a current flowing in the main circuit configured in the casing, A primary conductor disposed in the housing so that a current of the main circuit flows, a zero-phase current transformer that passes through the primary conductor and detects a leakage current of a load-side main circuit circuit to generate an output signal; In response to the output of the leakage detection circuit, the leakage detection circuit for determining whether or not the operating sensitivity has been reached by determining the magnitude of leakage in the main circuit circuit on the load side according to the output level of the output signal from the phase current transformer In an earth leakage circuit breaker equipped with an opening / closing mechanism that is operated by an electromagnet device to open and close the contact as an essential component, an electronic circuit operation that is in contact with the primary conductor and is built into the circuit breaker on an insulating member of the essential component For getting power A ground-fault interrupter, characterized in that fitted with power terminals.

  The ground fault circuit breaker according to the first embodiment is, in a superordinate concept, a casing composed of an insulating base and an insulating cover formed of a synthetic resin material, a primary flow through which a main circuit current built in the casing and opened and closed by a contact flows. A zero-phase current transformer through which the conductor, the primary conductor penetrates and detects a leakage current of the load-side main circuit circuit to generate an output signal; an output signal from the zero-phase current transformer is input to the load-side main circuit circuit; An earth leakage detection circuit for detecting an earth leakage, and an earth leakage circuit breaker having an open / close mechanism that opens and closes the main circuit contact in response to an output of the earth leakage detection circuit as an essential component, the earth leakage detection circuit being in contact with the primary conductor The earth leakage circuit breaker is characterized in that a power supply terminal for receiving the operating power is attached to the insulative member of the essential component.

Embodiment 2. FIG.
Hereinafter, a second embodiment of the present invention will be described with reference to FIG. FIG. 5 is a perspective view of the assembly portion of the zero-phase current transformer and the primary conductor of the leakage detection unit.

  In the second embodiment, as illustrated in FIG. 5, the main circuit energization section such as the primary conductors 21R, 21S, and 21T is added to the synthetic resin insulating outer case (insulating member) 221 of the zero-phase current transformer 22. Even when the power supply terminals 24R, 24S, and 24T that supply power to the leakage detection circuit are attached, the power supply terminals 24R, 24S, and 24T are configured to be in electrical contact with the primary conductors 21R, 21S, and 21T.

  Specifically, the power supply terminals 24R, 24S, and 24T in the second embodiment are the same as or equivalent to the power supply terminals 24R, 24S, and 24T illustrated in FIG. 4, and accordingly, the left and right poles of the primary conductor 21 are used. The power terminals 24R and 24T that come into contact with 21R and 21T have the same shape and the same size, a hole 24Ra (24Ta) for attaching the power terminal 24R (24T) to the insulation outer case 221 of the zero-phase current transformer 22, and the primary conductor The contact surface 24Rb (24Tb) in electrical contact with 21R (21T) and the hole 24Rc (24Tc) to which the lead wire 222 drawn out from the leakage detection circuit is connected. The lead wire 222 from the leakage detection circuit The power supply terminal 24S, which has an attachable structure and contacts the middle pole 21S of the primary conductor 21, has a hole 24Sa for attaching the power supply terminal 24 to the insulating outer case 221 of the insulator of the zero-phase current transformer 22. A contact surface 24Sb of the next conductor 21 in electrical contact with the lead wire 222 drawn from leakage detection circuit is constituted by a hole 24Sc connected.

  In the second embodiment, as illustrated in FIG. 5, power is supplied to the leakage detection circuit from the main circuit energization section such as the primary conductors 21R, 21S, and 21T to the insulation outer case 221 of the zero-phase current transformer 22. The power supply terminals 24R, 24S, and 24T to be supplied are mounted through mounting holes 24Ra, 24Sa, and 24Ta (not shown in the shade of the primary conductors 21R, 21S, and 21T in FIG. 5). The leakage detection circuit itself is a known circuit (usually an electronic circuit) and is not shown in the second embodiment. For example, the leakage detection circuit is built in the electromagnet device 200 in FIGS. 6 and 7 together with an electromagnet (not shown). What is necessary is just to be the structure to do.

  In the second embodiment, the power terminals 24R, 24S, 24T are contact surfaces 24Rb, 24Sb, 24Tb (in FIG. 5, primary conductors 21R, 24Tb) in a state where they are attached to the outer insulation case 221 of the zero-phase current transformer 22. 21S, 21T and not shown) and the primary conductors 21R, 21S, 21T on the zero-phase current transformer side plane portions 21a, 21b (not shown in FIG. 5 behind the primary conductors 21R, 21S, 21T). ) To be in electrical contact.

  Further, the contact surfaces 24Rb and 24Tb of the power terminals 24R and 24T attached to the insulation outer case (insulating member) 221 of the zero-phase current transformer 22 (not shown in the shade of the primary conductors 21R, 21S and 21T in FIG. 5). ) Is in contact with the planar portion 21a (not shown in the shade of the primary conductors 21R, 21S, 21T in FIG. 5) of the left and right primary conductors 21R, 21T on the zero-phase current transformer 22 side, and the contact of the power supply terminal 24S. The surface 24Sb (in FIG. 5, the shade of the primary conductors 21R, 21S, 21T is not shown) is the intermediate pole primary conductor 21S, the zero-phase current transformer 22 side 21b (in FIG. 5, the shade of the primary conductors 21R, 21S, 21T). In the state before the insulation cover 12 of the earth leakage circuit breaker is attached, the holes 24Rc, 24Sc, 24Tc portions (connection portions) of the power terminals 24R, 24S, 24T are exposed to the outside. Since it has, operation of connecting the lead wire 222 of the electric leakage detection circuit is easy.

  As described above, in the leakage breaker illustrated in the second embodiment, the leakage detection is performed from the main circuit energization section such as the three-phase primary conductors 21R, 21S, and 21T in the insulation outer case 221 of the zero-phase current transformer 22. Power supply terminals 24R, 24S, and 24T that supply power to a circuit (for example, built in the electromagnet device of FIGS. 6 and 7) are in contact with the three-phase primary conductors 21R, 21S, and 21T of the left and right middle poles.

  In the second embodiment, power is supplied to the leakage detection circuit from the main circuit energizing section such as the three-phase primary conductors 21R, 21S, and 21T to the insulating outer case (insulating member) 221 made of an insulator of the zero-phase current transformer 22. Since the power terminals 24R, 24S, and 24T can be electrically connected to the three-phase primary conductors 21R, 21S, and 21T only by mounting the power terminals 24R, 24S, and 24T to be supplied, the conventional three-phase primary conductor is provided. Soldering or screwing with 21R, 21S, and 21T is unnecessary, the number of assembling steps can be reduced, the structure can be simplified, and the assembling workability becomes easy.

  The configuration and functions other than the above-described configuration and functions of the second embodiment are the same as those of the first embodiment.

Embodiment 3 FIG.
Hereinafter, a third embodiment of the present invention will be described with reference to FIG. 6 and FIG. FIG. 6 is a plan view illustrating a state in which the power supply terminal and the leakage detection unit are incorporated in the insulation base of the leakage breaker, and FIG. 7 is a perspective view illustrating a state in which the power supply terminal and the leakage detection unit are incorporated in the insulation base of the leakage breaker. FIG.

  In the third embodiment, as shown in FIG. 6 and FIG. 7, the leakage detection is detected in the insulation base 11 at the place where the insulation base (insulation member) 11 made of synthetic resin and the primary conductor 21 are adjacent to each other. The power terminals 24R, 24S, and 24T are configured to be in electrical contact with the primary conductor 21 even when the power terminals 24R, 24S, and 24T that supply power to the circuit are mounted.

  Specifically, the power supply terminals 24R, 24S, and 24T in the third embodiment are the same as or equivalent to the power supply terminals 24R, 24S, and 24T illustrated in FIG. 4, and accordingly, the left and right poles of the primary conductor 21 are used. The power terminals 24R and 24T contacting the terminals 21R and 21T have the same shape and the same size. The holes 24Ra (24Ta) for attaching the power terminals 24R (24T) to the insulating base 11 of the earth leakage breaker and the primary conductor 21R (21T) The contact surface 24Rb (24Tb) in electrical contact with the lead wire 222 drawn from the leakage detection circuit is connected to the hole 24Rc (24Tc), and the lead wire 222 from the leakage detection circuit (electronic circuit) The power supply terminal 24S, which has an attachable structure and contacts the middle pole 21S of the primary conductor 21, has a hole 24Sa for attaching the power supply terminal 24 to the insulation base 11 of the earth leakage breaker, the primary conductor 21 and A contact surface 24Sb that gas contact, a lead line 222 drawn from leakage detection circuit is constituted by a hole 24Sc connected. The leakage detection circuit itself is a known circuit and is not shown in the third embodiment. However, the leakage detection circuit is built in the electromagnet device 200 in FIGS. 6 and 7 together with an electromagnet (not shown).

  In the third embodiment, as illustrated in FIGS. 6 and 7, the power supply terminal 24R that supplies power to the leakage detection circuit from the main circuit energization unit such as the primary conductors 21R, 21S, and 21T to the insulating base 11. 24S, 24T are mounted through mounting holes 24Ra, 24Sa, 24Ta (not shown in the shade of the insulating base 11 in FIGS. 6 and 7).

  In the third embodiment, the power supply terminals 24R, 24S, and 24T are contacted with the contact surfaces 24Rb, 24Sb, and 24Tb (shown behind the insulating base 11 in FIGS. 6 and 7) when attached to the insulating base 11. Are not in contact with the planar portions 21a, 21b of the primary conductors 21R, 21S, 21T opposite to the zero-phase current transformer 22 (not shown behind the insulating base 11 in FIGS. 6 and 7). It is configured to be able to.

  Further, contact surfaces 24Rb and 24Tb (not shown in the shade of the insulating base 11 in FIGS. 6 and 7) of the power terminals 24R and 24T attached to the insulating base (insulating member) 11 of the earth leakage breaker are left and right poles. The primary conductors 21R and 21T are in contact with the flat portion 21a (not shown in the shade of the insulating base 11 in FIGS. 6 and 7) on the zero-phase current transformer 22 side, and contact surfaces 24Sb (see FIGS. 6 and 7) of the power supply terminal 24S. 7 is not shown in the shade of the insulating base 11) and contacts the zero-phase current transformer 22 side 21 b of the primary conductor 21 S of the middle pole (not shown in the shade of the insulating base 11 in FIGS. 6 and 7). In this state, the holes 24Rc, 24Sc, 24Tc of the power terminals 24R, 24S, 24T (connection portions) are exposed to the outside before the insulation cover 12 of the earth leakage breaker is attached. Lee Connecting work between the line 222 is easy.

  The interphase insulation between the primary conductors 21R and 21T and the interphase insulation between the primary conductors 21R and 21T and the intermediate primary conductor 21S are performed by the primary conductor interphase insulating portion 232 provided in the insulating base 11.

  As described above, in the earth leakage breaker exemplified in the third embodiment, the earth leakage detecting circuit (built in the electromagnet device 200) is connected to the insulating base 11 from the main circuit energizing section such as the three-phase primary conductors 21R, 21S, and 21T. Power supply terminals 24R, 24S, and 24T that supply power to the left and right middle poles of the three-phase primary conductors 21R, 21S, and 21T are in contact with each other.

  In the third embodiment, power terminals 24R, 24S, which supply power to the leakage detection circuit from the main circuit energizing section such as the three-phase primary conductors 21R, 21S, 21T to the insulation base (insulating member) 11 of the leakage breaker. Since the power terminals 24R, 24S, and 24T can be electrically connected to the three-phase primary conductors 21R, 21S, and 21T only by mounting the 24T, soldering to the conventional three-phase primary conductors 21R, 21S, and 21T is possible. Or, screwing is unnecessary, the number of assembling steps can be reduced, the structure can be simplified, and the assembling workability becomes easy.

  The configuration and functions other than the above-described configuration and functions of the third embodiment are the same as those of the first embodiment.

  In addition, in each figure of FIGS. 1-7, the same code | symbol shows the same or an equivalent part.

It is a figure which shows Embodiment 1 of this invention, and is a vertical front view which shows the internal structure of an earth-leakage circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows Embodiment 1 of this invention, and is the disassembled perspective view which looked at the state which decomposed | disassembled the assembly part and insulation member part of the zero phase current transformer of a leak detection part and a primary conductor. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows Embodiment 1 of this invention, and is the disassembled perspective view which looked at the state which decomposed | disassembled the assembly part and insulating member part of a zero phase current transformer and a primary conductor from the right side. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows Embodiment 1 of this invention, and is a perspective view which shows the power supply terminal of right-and-left phases (for example, R phase and T phase (an intermediate phase is S phase)) among three phases. It is a figure which shows Embodiment 2 of this invention, and is a perspective view of the assembly part of the zero phase current transformer of a leak detection part and a primary conductor. It is a figure which shows Embodiment 3 of this invention, and is a top view which illustrates the state which incorporated the power supply terminal and the leakage detection part in the insulated base of the leakage breaker. It is a figure which shows Embodiment 3 of this invention, and is a perspective view which illustrates the state which incorporated the power supply terminal and the leakage detection part in the insulated base of the leakage breaker.

Explanation of symbols

10 housing,
11 Insulation base (insulation member),
12 Insulation cover (insulation member),
13 External terminal on the power supply side
14 fixed contact,
14a fixed contact,
15 movable contact,
15a movable contact,
16 arc extinguishing device,
17 Arc extinguishing plate,
18 handle,
19R, 19S, 19T Load side external terminals,
20 Overcurrent tripping mechanism,
21R, 21S, 21T primary conductors,
22 Zero-phase current transformer,
221 insulation outer case,
22a through hole,
222 Lead wire of leakage detection circuit,
23 insulation member,
231 Wall plate part,
232 Primary conductor interphase insulation,
2321 Upper side,
2322 Lower side,
2323 intermediate connection,
233 Load side external terminal phase insulation,
234 power terminal mounting part,
24R, 24S, 24T power supply terminals,
24Ra, 24Sa, 24Ta, hole,
24Rb, 24Sb, 24Tb, contact surface,
24Rc, 24Sc, 24Tc, hole,
100 blocking mechanism,
200 electromagnet device,
300 Opening / closing mechanism.

Claims (4)

A casing composed of an insulating base and an insulating cover formed of a synthetic resin material, a three-phase primary conductor that flows in a main circuit that is built in the casing and that is opened and closed by a contact, and the primary conductor passes through the load-side main circuit A zero-phase current transformer for detecting a leakage current in an electric circuit to generate an output signal, a leakage detection circuit for detecting a leakage in a main circuit circuit on the load side by inputting an output signal from the zero-phase current transformer, and the leakage detection In an earth leakage circuit breaker having an open / close mechanism that opens and closes the main circuit contact in response to an output of a circuit as an essential component, a power supply terminal that contacts the primary conductor and receives an operating power of the leak detection circuit is the essential component a the leakage breaker mounted on the insulating member of any essential components of,
The insulating member performs interphase insulation of the three-phase primary conductors and interphase insulation of the three-phase external terminals on the load side, and constitutes a part of the insulating cover so that the three-phase primary conductors are exposed to the outside. It is an insulating member molded into a shape that covers the three-phase primary conductor so as not to
The insulating member includes a wall plate portion that covers the three-phase primary conductor so that the three-phase primary conductor is not exposed to the outside, and a primary conductor inter-phase insulating portion formed in an inner central portion of the wall plate portion, A load-side external terminal interphase insulating part formed at the lower end of the wall plate part, and a power terminal attaching part for attaching the power terminal,
The power supply terminal attached to the power supply terminal attaching portion comes into contact with the primary conductor when the insulating member is incorporated into the primary conductor and the zero-phase current transformer,
Before the insulation cover is attached to the insulation base, the connection portion of the power terminal with the leakage detection circuit is exposed to the outside, and the lead wire of the leakage detection circuit is attached to the exposed connection portion. An earth leakage circuit breaker characterized by the above. 2. The earth leakage circuit breaker according to claim 1, wherein the insulating member is inserted into a through-hole of the zero-phase current transformer to insulate the phases of the three-phase primary conductors that pass through the zero-phase current transformer. The earth leakage circuit breaker is characterized in that the power terminal contacts the three-phase primary conductor. A casing composed of an insulating base and an insulating cover formed of a synthetic resin material, a three-phase primary conductor that flows in a main circuit that is built in the casing and that is opened and closed by a contact, and the primary conductor passes through the load-side main circuit A zero-phase current transformer for detecting a leakage current in an electric circuit to generate an output signal, a leakage detection circuit for detecting a leakage in a main circuit circuit on the load side by inputting an output signal from the zero-phase current transformer, and the leakage detection In an earth leakage circuit breaker having an open / close mechanism that opens and closes the main circuit contact in response to an output of a circuit as an essential component, a power supply terminal that contacts the primary conductor and receives an operating power of the leak detection circuit is the essential component An earth leakage breaker attached to an insulating member of any essential component of
It said insulating member is Ri Ah outside case of the zero-phase current transformer,
The power terminal attached to the outer case of the zero-phase current transformer is in contact with the primary conductor;
Before the insulation cover is attached to the insulation base, the connection portion of the power terminal with the leakage detection circuit is exposed to the outside, and the lead wire of the leakage detection circuit is attached to the exposed connection portion. An earth leakage circuit breaker characterized by the above. A casing composed of an insulating base and an insulating cover formed of a synthetic resin material, a three-phase primary conductor that flows in a main circuit that is built in the casing and that is opened and closed by a contact, and the primary conductor passes through the load-side main circuit A zero-phase current transformer for detecting a leakage current in an electric circuit to generate an output signal, a leakage detection circuit for detecting a leakage in a main circuit circuit on the load side by inputting an output signal from the zero-phase current transformer, and the leakage detection In an earth leakage circuit breaker having an open / close mechanism that opens and closes the main circuit contact in response to an output of a circuit as an essential component, a power supply terminal that contacts the primary conductor and receives an operating power of the leak detection circuit is the essential component An earth leakage breaker attached to an insulating member of any essential component of
Said insulating member is Ri Oh in the insulating base,
The power terminal attached to the insulating base contacts the primary conductor;
Before the insulation cover is attached to the insulation base, the connection portion of the power terminal with the leakage detection circuit is exposed to the outside, and the lead wire of the leakage detection circuit is attached to the exposed connection portion. An earth leakage circuit breaker characterized by the above.

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