Contact mechanism of low-voltage circuit breaker

Abstract

The invention discloses a contact mechanism of a low-voltage circuit breaker. The device comprises a driving wheel and an arc extinguishing chamber. A back surface of the driving wheel is fixedly connected with a driving device; a manual rotating rod is arranged on a front surface of the driving wheel; the driving wheel is engaged with two racks; the two racks are arranged in parallel; one end ofeach rack is fixedly connected with one end of a movable telescopic rod; the other end of the movable telescopic rod is fixedly connected with a movable contact piece; the number of arc extinguishingchambers is two, the arc extinguishing chambers correspond to respective racks; first springs are arranged in the arc extinguishing chambers; the other end of each first spring is fixedly connected with a static contact piece; a plurality of arc extinguishing sheets are uniformly arranged on inner walls of the arc extinguishing chambers at equal intervals; and another end of each rack is fixedly connected with a limiting rod, the limiting rod is sleeved with a positioning pipe, and the movable telescopic rods, the racks, the limiting rods and the positioning pipes are hollow structures. The contact mechanism has the advantages that safety guarantee measures are provided, the safety performance of the circuit breaker is enhanced, and the arc extinguishing effect is better.

Description

technical field [0001] The invention relates to the technical field of low-voltage circuit breakers, in particular to a contact mechanism of a low-voltage circuit breaker. Background technique [0002] In the contact system of a circuit breaker, the static contact assembly is the key component inside. The existing static contact assembly of the molded case circuit breaker is divided into two types: fixed static contact and movable static contact. Electric contacts are widely used in relays, contactors, load switches, medium and low voltage circuit breakers, household appliances, automotive appliances (speakers, lights, ignition) and other switching electrical contact materials. The static contact is the static contact waiting for the moving contact to be connected. The electrical circuit can be automatically or manually connected and disconnected according to the external specified signals and requirements. In the prior art, an electrical contact system is generally used to...

AI Technical Summary

Problems solved by technology

However, for a double-contact electrical contact system, it is required that a pair of moving contacts and a pair of static contacts must be able to make reliable electrical contact. If there is a moving contact and a static contact that cannot be reliably electrically contacted, the circuit will fail. turned on

[0003] Not only that, there is no corresponding fault protection measure in the contact system of the circuit breaker in the prior art. If the driving mechanism that drives the contact system to connect and disconnect sometimes fails, it cannot be normally connected or disconnected. Especially when the circuit fails, if it cannot be disconnected in time, it will inevitably bring great danger.

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