Arc extinguishing unit of molded case circuit breaker

Abstract

The present disclosure relates to an arc extinguishing device of a molded case circuit breaker which includes a fixed contactor fixedly provided on part of a base assembly case; a movable contactor brought into contact with or separated from the fixed contactor; and an arc extinguishing unit configured to extinguish an arc generated when the movable contactor is separated from the fixed contactor, and the arc extinguishing unit including a pair of side plates provided on the base assembly case; and a plurality of grids provided to have a predetermined distance between the pair of side plates, and the grid including a first grid formed with a first cutout portion on a first side surface where an arc is generated; and a second grid formed with a second cutout portion having a depth different from that of the first cutout portion on a second side surface where an arc is generated.

Dependencies are inferred from the claim text.