CN209896001U

CN209896001U - Plastic case circuit breaker with grounding function

Info

Publication number: CN209896001U
Application number: CN201921261258.1U
Authority: CN
Inventors: 支朝乾
Original assignee: Haig Polytron Technologies Inc
Current assignee: Haig Polytron Technologies Inc
Priority date: 2019-08-06
Filing date: 2019-08-06
Publication date: 2020-01-03
Anticipated expiration: 2029-08-06

Abstract

The utility model relates to a take moulded case circuit breaker of ground connection, including base, well seat, the upper cover that sets gradually, the pedestal mounting is on the guide rail, be provided with the wiring board on the well seat, one side of wiring board is provided with the grounding lug, form the constant head tank on the well seat, the one end and the wiring board electricity of grounding lug are connected, and the other end setting of grounding lug is in the constant head tank, the ground hole that runs through well seat and base is formed to the below of constant head tank, be provided with ground screw on the other end of grounding lug, ground screw runs through grounding lug, ground hole after in proper order on the fixed guide rail, the guide rail is connected to the earth. The utility model discloses a moulded case circuit breaker can realize the ground protection of moulded case circuit breaker self, with the leading-in earth of the produced instantaneous current of thunderbolt, avoid moulded case circuit breaker itself to destroy, protect user's household electrical apparatus not influenced simultaneously, and the mounting means of protection ground connection is simple and convenient.

Description

Plastic case circuit breaker with grounding function

Technical Field

The utility model relates to a moulded case circuit breaker especially relates to a moulded case circuit breaker of area ground connection.

Background

The molded case circuit breaker can automatically cut off the current after the current exceeds the trip setting, and the overcurrent and short circuit protection of the circuit is realized. Moulded case circuit breaker installs usually in the switch board, present most moulded case circuit breaker self does not set up the earth connection, the female arranging by the transformer output of one side electricity connection of moulded case circuit breaker, moulded case circuit breaker's opposite side electricity is connected to user's family circuit, though be provided with ground protection on the transformer, transformer ground connection is unstable, and the distance of transformer to moulded case circuit breaker is far away from moulded case circuit breaker to user's family's distance usually, when the electric current through moulded case circuit breaker surpassed its rated current far away, for example the short circuit takes place for the circuit or the switch board receives the thunderbolt, the electric appliance of follow-up user's family not only can directly be access to the ground to the electric current in the.

Disclosure of Invention

In view of this, the utility model aims to provide a take moulded case circuit breaker of ground connection can realize the ground protection of moulded case circuit breaker self, with the leading-in earth of the produced instantaneous current of thunderbolt, avoids other mechanisms of moulded case circuit breaker to burn out because of overflowing in the twinkling of an eye.

In order to realize above purpose, the utility model discloses a such moulded case circuit breaker of area ground connection, including base, well seat, the upper cover that sets gradually, the pedestal mounting is on the guide rail, be provided with the wiring board on the well seat, one side of wiring board is provided with the grounding lug, form the constant head tank on the well seat, the one end and the wiring board electricity of grounding lug are connected, and the other end setting of grounding lug is in the constant head tank, the ground hole that runs through well seat and base is formed to the below of constant head tank, be provided with ground screw on the other end of grounding lug, ground hole after-fixing is to the guide rail to ground screw in proper order, the guide rail is connected to the earth.

The ground wire on the molded case circuit breaker is fixedly connected to the guide rail through the guide of the ground plate and the grounding screw, then the grounding of the molded case circuit breaker is realized through the ground connection of the guide rail, so that the lightning stroke or the instantaneous large current generated by the line fault can be directly released to the ground, the molded case circuit breaker is prevented from being damaged, the household electrical appliance of a user is protected from being influenced, the grounding mode is simple in structure, the installation is convenient, the cost is low, and an installer only needs to penetrate the grounding screw to be connected to the guide rail through the grounding piece.

The utility model discloses further set up to be provided with A looks return circuit, B looks return circuit, C looks return circuit, N looks return circuit on the base, be provided with surge protection module on the well seat, surge protection module is connected with the wiring board electricity, the wiring board is connected with A looks return circuit, B looks return circuit, C looks return circuit, N looks return circuit electricity respectively, surge protection module and wiring board all realize common ground connection through the grounding piece.

The surge protection module is connected with the wiring board in common, the grounding sheet is a junction point and a reference point, signal mutual interference of the molded case circuit breaker can be reduced, working stability of the wiring board and the surge protection module is improved, secondly, the surge protection module can absorb surge current generated by most lightning strokes, and the residual surge current is released to the ground through the grounding sheet.

The utility model discloses one side that the constant head tank is close to the wiring board is further set up to form lets the position mouth, the grounding lug includes connecting portion, the first portion of turning over and the second portion of turning over that forms the perpendicular to connecting portion are extended respectively to the both sides of connecting portion in the head and the tail both ends of connecting portion, first portion of turning over sets up and is being connected in the grounding end electricity that lets the position mouth and with the wiring board, the second portion of turning over sets up in the bottom of constant head tank, and ground screw connects on the second portion of turning over.

The shell of the molded case circuit breaker is provided with a certain space for the grounding piece, so that the grounding piece is convenient to install, and the grounding piece connects the grounding potential inside the molded case circuit breaker to the ground.

The utility model discloses further set up to form the electrically conductive clamping piece of multi-disc on the wiring board, the electrically conductive clamping piece of multi-disc is connected A looks return circuit, B looks return circuit, C looks return circuit, N looks return circuit and grounding piece respectively electricity, form the electrically conductive inserted sheet of multi-disc on the surge protection module, the surge protection module forms the electricity with the wiring board through the cooperation of electrically conductive inserted sheet and electrically conductive clamping piece and is connected.

The surge protection module is electrically connected to each phase loop and the grounding piece of the molded case circuit breaker through the matching of the conductive insertion piece and the conductive clamping piece, and the surge protection module is convenient to replace and install.

The utility model discloses further set up to surge protection module and include a plurality of FUSEs FUSE, a plurality of lightning protection piezo-resistor SPD and gas discharge tube GDT, gas discharge tube GDT's one end earth connection, be connected with FUSE FUSE and lightning protection piezo-resistor SPD between A looks return circuit and gas discharge tube GDT's the other end, be connected with FUSE FUSE and lightning protection piezo-resistor SPD between B looks return circuit and the other end of gas discharge tube GDT, be connected with FUSE FUSE and lightning protection piezo-resistor SPD between C looks return circuit and gas discharge tube GDT's the other end, be connected with lightning protection piezo-resistor SPD between N looks return circuit and the other end of gas discharge tube GDT.

When the molded case circuit breaker is struck by lightning, the resistance of the lightning protection voltage dependent resistor SPD connected between each phase loop (A, B, C, N phase) and the ground wire is rapidly reduced when the instantaneous voltage is higher than a certain value, so that the heavy current is conducted; when the current passing through the lightning protection piezoresistor SPD is overlarge and the duration is too long, the FUSE FUSE connected between each phase loop (A, B, C phase) and the ground wire is fused; the gas discharge tube GDT is conducted when the voltage at two ends of the gas discharge tube GDT is increased to exceed the insulation strength of gas in the gas discharge tube GDT, and the shared gas discharge tube GDT is used for accelerating the conduction of the gas discharge tube GDT by applying the lightning stroke voltage of each phase at two ends of the gas discharge tube GDT. When the molded case circuit breaker is struck by lightning, no matter which phase loop generates surge current, most of the surge current generated by the lightning stroke is absorbed through the lightning protection piezoresistor SPD, and then the rest surge current is released to the ground through the gas discharge tube GDT, so that the surge protection module finishes the gradual release of the lightning stroke energy.

This practicality further sets up to the number of pieces of electrically conductive inserted sheet and the number of pieces of electrically conductive clamping piece and is 5.

The 5 conductive inserting pieces and the conductive clamping pieces are used for electrically connecting the surge protection module to each phase loop and the ground wire.

Drawings

Fig. 1 is an exploded view of a molded case circuit breaker according to an embodiment of the present invention.

Fig. 2 is a front view of the molded case circuit breaker of the embodiment of the present invention with the upper cover removed.

Fig. 3 is a cross-sectional view a-a of fig. 2.

Fig. 4 is a perspective view of the grounding plate according to the embodiment of the present invention.

Fig. 5 is a perspective view of a surge protection module and a conductive clip according to an embodiment of the present invention.

Fig. 6 is a schematic circuit diagram of a surge protection module according to an embodiment of the present invention.

Detailed Description

As shown in fig. 1-5, the utility model relates to a moulded case circuit breaker with ground connection, including base 1, well seat 2, the upper cover 3 that sets gradually, base 1 installs on guide rail 4, is provided with A looks return circuit 11, B looks return circuit 12, C looks return circuit 13, N looks return circuit 14 on the base 1, be provided with wiring board 21 and surge protection module 6 on well seat 2, one side of wiring board 21 is provided with ground lug 5, forms 5 electrically conductive clamping pieces 26 on the wiring board 6, and electrically connected A looks return circuit 11, B looks return circuit 12, C looks return circuit 13, N looks return circuit 14 and ground lug 5 respectively are connected to electrically conductive clamping piece 26, form 5 electrically conductive inserted sheets 61 on the surge protection module 6, and surge protection module 6 forms the electricity with wiring board 21 through the cooperation of electrically conductive inserted sheet 61 with electrically conductive clamping piece 26 and is connected, ground lug 5 includes connecting portion 51, the first turnover portion 52 that forms the perpendicular to connecting portion is extended to connecting portion 51 to the both sides of connecting portion 51 respectively in the head and the And second folding portion 53, well seat 2 is last to form constant head tank 22, and one side that constant head tank 22 is close to wiring board 21 forms and lets a mouthful 25, first folding portion 52 sets up and is being abdied mouthful 25 and be connected with the earthing terminal electricity on the wiring board 21, second folding portion 53 sets up the bottom at constant head tank 22, the below of constant head tank 22 forms the earthing hole 23 that runs through well seat 2 and base 1, earthing screw 24 runs through second folding portion 53, earthing hole 23 after-fixing to guide rail 4 in proper order, guide rail 4 is connected to the ground, surge protection module 6 and wiring board 21 all realize common ground connection through earthing strip 5.

As shown in fig. 6, the surge protection module includes a plurality of FUSEs, a plurality of lightning protection piezoresistors SPD and a gas discharge tube GDT, one end of the gas discharge tube GDT is connected to a ground wire, the FUSEs and the lightning protection piezoresistors SPD are connected between the a-phase loop and the other end of the gas discharge tube GDT, the FUSEs and the lightning protection piezoresistors SPD are connected between the B-phase loop and the other end of the gas discharge tube GDT, the FUSEs and the lightning protection piezoresistors SPD are connected between the C-phase loop and the other end of the gas discharge tube GDT, and the lightning protection piezoresistors SPD are connected between the N-phase loop and the other end of the gas discharge tube GDT.

According to the above embodiment, the utility model discloses moulded case circuit breaker's surge protection module and wiring board are all fixed on the guide rail of ground connection through the cooperation of ground connection screw and grounding lug, thereby realize common ground connection, when suffering thunderbolt or line fault produce instantaneous heavy current, the lightning protection piezo-resistor SPD on the surge protection module switches on the most surge current of absorption rapidly, and release surplus surge current to the ground through gas discharge tube GDT, make moulded case circuit breaker self take the function of ground connection discharge, not only improve moulded case circuit breaker life, and can effectively protect follow-up electrical apparatus not damaged.

Claims

1. The utility model provides a take moulded case circuit breaker of ground connection, is including base, well seat, the upper cover that sets gradually, the pedestal mounting is on the guide rail, its characterized in that: be provided with the wiring board on the well seat, one side of wiring board is provided with the grounding lug, form the constant head tank on the well seat, the one end and the wiring board electricity of grounding lug are connected, and the other end setting of grounding lug is in the constant head tank, the ground connection hole that runs through well seat and base is formed to the below of constant head tank, be provided with the ground connection screw on the other end of grounding lug, the ground connection screw runs through grounding lug, ground connection hole after-fixing to the guide rail in proper order, the guide rail is connected to the ground.

2. The molded case circuit breaker with ground of claim 1, wherein: be provided with A looks return circuit, B looks return circuit, C looks return circuit, N looks return circuit on the base, be provided with the surge protection module on the well seat, the surge protection module is connected with the wiring board electricity, the wiring board is connected with A looks return circuit, B looks return circuit, C looks return circuit, N looks return circuit electricity respectively, the common ground connection is all realized through the grounding strip to surge protection module and wiring board.

3. A molded case circuit breaker with ground according to claim 1 or 2, characterized in that: the constant head tank is close to one side formation of wiring board and lets a mouthful, the grounding lug includes connecting portion, the first portion of turning over and the second portion of turning over that the both ends of connecting portion extended formation perpendicular to connecting portion to the both sides of connecting portion respectively, first portion of turning over sets up and is being connected in the mouth of stepping down and with the wiring board electricity, the second portion of turning over sets up in the bottom of constant head tank, and ground screw connects on the second portion of turning over.

4. The molded case circuit breaker with ground of claim 2, wherein: the surge protection module is characterized in that a plurality of conductive clamping pieces are formed on the wiring board and are respectively and electrically connected with the phase A loop, the phase B loop, the phase C loop, the phase N loop and the grounding piece, a plurality of conductive insertion pieces are formed on the surge protection module, and the surge protection module is electrically connected with the wiring board through the matching of the conductive insertion pieces and the conductive clamping pieces.

5. The molded case circuit breaker with ground of claim 4, wherein: the surge protection module comprises a plurality of FUSEs, a plurality of lightning protection piezoresistors and a gas discharge tube GDT, one end of the gas discharge tube GDT is connected with a ground wire, the FUSEs and the lightning protection piezoresistors are connected between the A-phase loop and the other end of the gas discharge tube GDT, the FUSEs and the lightning protection piezoresistors are connected between the B-phase loop and the other end of the gas discharge tube GDT, the FUSEs and the lightning protection piezoresistors are connected between the C-phase loop and the other end of the gas discharge tube GDT, and the lightning protection piezoresistors are connected between the N-phase loop and the other end of the gas discharge tube GDT.

6. The molded case circuit breaker with ground according to claim 4 or 5, wherein: the number of the conductive insertion pieces and the number of the conductive clamping pieces are 5.