Patent ID: 7535327
Filing Date: 2009-05-19
Classification: H01H

Abstract:
1. A circuit breaker comprising: a main case containing a contactor section, an arc-extinguishing device and an overcurrent tripping device; a middle cover laid on the main case, the middle cover having in a central section thereof a recess partitioned with a bottom wall for containing a switching mechanism and at least one interior attachment; and a top cover covering the top side of the recess in the middle cover, the main case, the middle cover and the top cover being arranged to be dividable from one another, wherein the middle cover has an auxiliary cover, covering the switching mechanism, and the auxiliary cover has the top cover mounted thereon, wherein the auxiliary cover covers a region except for a containing section of the at least one interior attachment and the top cover is hinged to the auxiliary cover at an end section thereof, and wherein the auxiliary cover is divided into a first cover section covering the switching mechanism and a second cover section covering a peripheral surface region of the switching mechanism, and the first cover section covering the switching mechanism is mounted on the main case.