Arc extinguishing device of molded case circuit breaker and molded case circuit breaker

Abstract

The invention discloses an arc extinguishing device of a molded case circuit breaker and the molded case circuit breaker. The arc extinguishing device comprises an arc extinguishing chamber, a white vulcanized fiber board and an arc isolating piece which are connected in sequence, the arc extinguishing chamber comprises an arc extinguishing grid piece and clamping plates on two sides, and the arcextinguishing grid piece comprises a U-shaped piece at the front end and a W-shaped piece at the rear end. An opening of the U-shaped piece faces the coming direction of an electric arc, the W-shapedpiece is provided with uniform small holes, the clamping plates are clamped on the two sides of the U-shaped piece, the bottom face of the W-shaped piece is perpendicular to the clamping plates, one side face of the W-shaped piece is attached to the bottom face of the U-shaped piece, and the white vulcanized fiber board is in a U shape. One side face of the white vulcanized fiber board is attachedto the outer side face of the W-shaped piece, the arc isolating piece is in a U shape, and one side face of the arc isolating piece is attached to the outer side face of the white vulcanized fiber board. The arc extinguishing device is simple in structure, low in cost and good in arc extinguishing effect.

Description

technical field [0001] The invention relates to the technical field of circuit breakers, in particular to an arc extinguishing device of a molded case circuit breaker and the molded case circuit breaker. Background technique [0002] Nowadays, people's life is inseparable from electric energy, and various protectors for protecting circuits have emerged as the times require. Among them, the molded case circuit breaker is one of the common circuit protectors, which is used for circuit overload and short circuit protection, that is, when the circuit is short-circuited or overloaded, the tripping mechanism of the molded case circuit breaker automatically cuts off the circuit to realize the protection of the circuit . In the process of cutting off the circuit, a large number of arcs will be generated. The generation of arcs is accompanied by high temperature and high pressure. If the arcs are not evacuated in time, it is easy to break down or burn the molded case circuit breaker...

AI Technical Summary

Problems solved by technology

In the process of cutting off the circuit, a large number of arcs will be generated. The generation of arcs is accompanied by high temperature and high pressure. If the arc is not evacuated in time, it is easy to break down or burn the molded case circuit breaker, which seriously affects the breaking capacity of the molded case circuit breaker.

[0003] Shock waves are formed when large currents or short circuits are broken, and unacceptable breaking and explosion noises are formed, which affect the use environment of circuit breakers; in addition, they cause cracking of molded case circuit breakers, and cause molded case circuit breakers after long-term and repeated discharge work Fatigue damage of circuit breaker components, affecting the reliability of the circuit breaker and shortening the service life

At the same time, it is difficult to achieve rapid arc extinguishing for high-current breaking of molded case circuit breakers, and after-arc re-strike may occur from time to time, resulting in breaking failure

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