Arc extinguishing device for molded case circuit breaker and molded case circuit breaker containing the same

Abstract

The invention relates to a molded case circuit breaker arc extinguishing device and a molded case circuit breaker comprising the same. The arc extinguishing device comprises a base, a static contact arranged on the base, an arc extinguishing chamber arranged above the static contact, and an arc extinguishing cover matching the arc extinguishing chamber. The arc extinguishing chamber is internally provided with arc extinguishing grid plates. The static contact is provided with a static contact point and an arc striking plate. The distance between the end of the arc striking plate at the static contact point and the arc extinguishing grid plates is smaller than the distance between the end away from the static contact point and the arc extinguishing grid plates. An arc generated when the circuit is opened is introduced by the arc striking plate to the arc extinguishing chamber and extinguished by the arc striking plate and the arc extinguishing grid plates. Compared with the prior art, by arranging the arc striking plate with arc striking and arc extinguishing functions on the static contact, an arc can be lengthened within a limited space and then cooled and extinguished, the arc striking ability is good, arc extinguishing is quick, the critical load current and short circuit breaking capacity are enhanced greatly, the overall structure is simple, and the processing and maintenance costs are low.

Description

Technical field [0001] The invention belongs to the technical field of molded case circuit breakers, and relates to a molded case circuit breaker arc extinguishing device and a molded case circuit breaker containing the device. Background technique [0002] Nowadays, people's lives are inseparable from electric energy, and various protectors used to protect circuits have emerged. Among them, the molded case circuit breaker is one of the common circuit protectors, used for circuit overload 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 protect 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 arc is not evacuated in time, it will easily break down or burn the molded case circuit breaker, which will seriously affect t...

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.

Existing arc extinguishing devices are often difficult to balance high arc extinguishing performance and high arc ignition ability, and it is easy to cause damage to the molded case circuit breaker due to poor arc ignition ability, which affects the service life and electrical safety

However, some molded case circuit breakers equipped with an arc striking mechanism often have a very complicated structure, which requires high technical requirements for production and processing, thereby increasing the overall cost.

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