Patent ID: 6559745
Filing Date: 2003-05-06
Classification: H01H

Abstract:
A circuit breaker comprising:a breaker case; an ancillary switch for detecting an ON/OFF state of a contact of a main circuit, an alarm switch for detecting tripping operation; a pair of left-side and right-side accessory switch housing sections for housing said ancillary switch and said alarm switch, the ancillary switch and the alarm switch being cassette type switches; wherein said ancillary switch is provided on said breaker case and is opened/closed in conjunction with an output protrusion formed on an open-close lever of an open-close mechanism for opening/closing a contact of a main circuit; said alarm switch is provided on said breaker case and is opened/closed in conjunction with an alarm output plate which operates in accordance with tripping action of the open-close mechanism; a symmetrically bifurcated output protrusion is provided on said open-close lever to oppose an operation lever of said ancillary switch provided in either one of said leftside and right-side accessory switch housing sections; and an extremity of said alarm output plate is caused to oppose an operation lever of said alarm switch which is provided as a pivotal lever coupled directly to the open-close mechanism and is to be provided in said accessory switch housing section in a direction orthogonal to said open-close lever.