A circuit breaker with quick opening contact structure

Abstract

The invention provides a breaker with a contact structure capable of being quickly opened. Before short circuit current reaches an expected maximum value, moving contacts can be repulsed by electro-dynamic repulsion force, fixed contacts also can be repulsed synchronously to generate electric arcs, voltage of the electric arcs ascends quickly, ascendance of the short circuit current is effectively restrained, after a mechanism is tripped, under the effect of a connection rod, the fixed contacts still stay at a repulsion position, a large open distance between the contacts is guaranteed, let-through energy of the breaker is effectively reduced, and short circuit breaking capacity of the breaker is improved.

Description

technical field [0001] The invention relates to the technical field of low-voltage circuit breakers, in particular to a circuit breaker with a quick-opening contact structure in which moving and static contacts can be simultaneously separated and broken under short-circuit current. Background technique [0002] Low-voltage circuit breakers can be used for short-circuit current protection of lines. For some current-limiting circuit breakers, before the actual fault short-circuit current of the line reaches the peak value of the expected short-circuit current of the line, the moving contacts will be repulsed under the action of electric repulsion to generate an arc, thereby limiting the further increase of the short-circuit current . [0003] When a general circuit breaker passes a short-circuit current, only the moving contact can be repelled to generate an arc and limit the short-circuit current. Due to the limited opening distance of the moving contact, the rise of the arc...

AI Technical Summary

Problems solved by technology

For some current-limiting circuit breakers, before the actual fault short-circuit current of the line reaches the peak value of the expected short-circuit current of the line, the moving contacts will be repulsed under the action of electric repulsion to generate an arc, thereby limiting the further increase of the short-circuit current

[0003] When a general circuit breaker passes a short-circuit current, only the moving contact can be repelled to generate an arc and limit the short-circuit current. Due to the limited opening distance of the moving contact, the increase of the arc voltage will also be limited.

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