Patent ID: 7154062
Filing Date: 2006-12-26
Classification: H01H

Abstract:
1. A circuit breaker comprising: contactor sections for poles corresponding to phases in a multi-phase circuit, each of the contactor sections comprising a stationary contactor and a movable contactor; arc-extinguishing devices for the respective contactor sections; a switching mechanism driving the movable contactors for switching; a tripping mechanism for the switching mechanism; an overcurrent tripping device actuating the tripping mechanism by detecting an overcurrent; and a molded case including a main case containing the contactor section and the arc-extinguishing device for each pole and the overcurrent tripping device; a middle cover disposed on the main case, the middle cover having a recess, partitioned with a wall, formed at a central section thereof for containing the switching mechanism and the tripping device; and a top cover covering the top of the middle cover, said main case, the middle cover and the top cover being arranged to be dividable from one another, wherein the molded case has interpole partitions, surrounding the contactor section and the arc-extinguishing device for each of the poles, for isolating said section and said device from other sections and devices, and an intermediate partition for isolating the contactor sections from the overcurrent tripping device arranged next to the contactor sections on a back thereof, and a wall, provided on a back of the arc-extinguishing devices, having gas outlets opening to an outside of the molded case.