Arc gas discharge device of air circuit breaker

Abstract

Disclosed is an arc gas discharge device of an air circuit breaker, capable of preventing damage to an arc extinguishing chamber caused by a sudden rise in pressure. The arc gas discharge device of an air circuit breaker, according to one embodiment of the present disclosure, comprises: a base having an arc extinguishing space in which an arc, generated by means of the operation of a movable contact with respect to a stationary contact, rises and is extinguished; an arc extinguishing unit which is provided in the arc extinguishing space of the base, and which has a the plurality of gridss so that the arc is extinguished and is exhausted through the top thereof; a guide member which is provided in the base and has a part thereof that restricts and guides the arc extinguishing unit so that the arc extinguishing unit can be slightly elevated in the arc extinguishing space; and an elastic member for providing elastic force so that the arc extinguishing unit comes in close contact with the base in the arc extinguishing space, wherein, if an arc gas exceeds a certain pressure, the extinguishing unit rises while overcoming the elastic force of the elastic member, and an exhaust passage is open between the arc extinguishing unit and the base so that the arc gas can be exhausted.

Dependencies are inferred from the claim text.