Anti-reclosing mechanism of dual-breaker molded case circuit breaker

Abstract

An anti-reclosing mechanism for a double breakpoint molded case circuit breaker, comprising a moving contact support, a double breakpoint moving contact, a moving contact stop plate, a moving contact spring pin and a moving contact spring, the described The double break point moving contact is composed of two or more moving contact pieces, and a moving contact stop plate is embedded between the moving contact pieces. When the double break point molded case circuit breaker is in In the short circuit state, a strong electromagnetic repulsion is generated to make the moving contact rotate in the breaking direction. Since the moving contact stop plate is embedded in the moving contact, the moving contact will be stuck in the moving contact at this time. Between the head stop plate and the spring pin of the moving contact, the moving contact can no longer be rotated to generate reclosing. This anti-reclosing mechanism has a simple structure and works stably and reliably.

Description

technical field [0001] The invention relates to a low-voltage electrical appliance, in particular to an anti-reclosing mechanism of a double break point molded case circuit breaker. Background technique [0002] Molded case circuit breaker is a commonly used protective device. It has the functions of on-off load current and overload and short-circuit protection of the load. It is widely used in overload and short-circuit protection of various power distribution systems and motors. The double-breakpoint molded case circuit breaker is a relatively new type of molded case circuit breaker. The traditional double-breakpoint molded case circuit breaker uses two positioning tension springs in the support of the double-breakpoint moving contact, so that the double-breakpoint The dynamic and static contacts of the molded case circuit breaker can maintain the closing state under a certain pressure when closing, and can maintain the breaking state when the short circuit is broken. Due ...

AI Technical Summary

Problems solved by technology

The double-breakpoint molded case circuit breaker is a relatively new type of molded case circuit breaker. The traditional double-breakpoint molded case circuit breaker uses two positioning tension springs in the support of the double-breakpoint moving contact, so that the double-breakpoint The dynamic and static contacts of the molded case circuit breaker can maintain the closing state under a certain pressure when closing, and can maintain the breaking state when the short circuit is broken. Due to the huge impact and vibration generated by the circuit breaker when the short circuit is broken, it often makes The double-breakpoint molded case circuit breaker cannot be kept in the off state and recloses. This situation will cause serious electrical accidents, ranging from burning the circuit breaker to burning the circuit.

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