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

Abstract

The invention discloses an anti-reclosing mechanism of a dual-breaker molded case circuit breaker. The anti-reclosing mechanism comprises a moving contact support part, a dual-breaker moving contact,a moving contact stop plate, a moving contact spring pin and a moving contact spring, wherein the dual-breaker moving contact comprises two or more moving contact blades; the moving contact stop plateis embedded between the moving contact blades; the dual-breaker molded case circuit breaker generates strong electromagnetic repulsion when in a short-circuit state, so that the moving contact rotates towards a breaking direction; and the moving contact stop plate is embedded into the moving contact and the moving contact is clamped between the moving contact stop plate and the moving contact spring pin, so that the moving contact cannot rotate to be reclosed. The anti-reclosing mechanism is simple in structure and stable and reliable in working.

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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