Movable contact assemblies for circuit breakers

Abstract

Disclosed herein is a movable contact assembly for a circuit breaker, and more particularly, a movable contact assembly for a circuit breaker in which a pressurizing protrusion for pushing a catch is provided at each of movable contact fingers and thus, when current limiting interruption occurs in any one of the movable contact fingers, reinputting of the movable contact fingers is prevented such that blocking thereof is stably kept. According to an aspect of the present invention, there is provided a movable contact assembly for a circuit breaker, which includes a fixed contact, a connector formed to protrude from one side of a terminal connected to a load or a power source, a plurality of movable contacts pivotably installed at the connector through a connector pin and configured to be contactable to or separable from the fixed contact, a side holder pivotably installed at the connector through the connector pin, a catch pivotably installed at the connector, supported on the side holder, and configured to restrict a rebound phenomenon of the plurality of movable contacts when current limiting interruption occurs, and a pressurizing protrusion formed at a lower portion of each of the plurality of movable contacts and configured to push the catch when the current limiting interruption occurs.

Description

technical field [0001] The present invention relates to movable contact assemblies for circuit breakers, and more particularly, to a movable contact assembly for circuit breakers in which at each movable contact finger A pressurized protrusion for pushing the catch is provided at and thus, when a current limiting interruption occurs in any of the movable contact fingers, re-input of the movable contact fingers is prevented such that Its blocking is maintained stably. Background technique [0002] In general, a circuit breaker is an electrical device installed at a power transmission station, a substation, or a circuit to cut off a circuit when a load is turned on or off, grounding is performed, or an accident such as a short circuit occurs. An air circuit breaker among such circuit breakers is a circuit breaker that uses air as an arc extinguishing medium and is mainly used in low voltage devices, and the movable contact assembly of the circuit breaker according to the pres...

AI Technical Summary

Problems solved by technology

[0010] However, if figure 2 As shown in , when the second movable contact 112 remains in the input state and only the first movable contact 111 is turned on, that is, when any one of the first movable contact 111 and the second movable contact 112 When opened, the catch 160 interferes with the unopened movable contact (in figure 2 is the second movable contact 112), and thereby prevents input into the catch recesses 111a and 112a, so that the effect of preventing re-input cannot be achieved

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