Patent ID: 6911614
Filing Date: 2005-06-28
Classification: H01H,Y10S

Abstract:
1. A circuit breaker comprising: a fixed contact, a rotatable contact, a contact holder supporting the rotatable contact, an operation handle moving between an ON position and an OFF position for opening and closing the rotatable contact, an over-current tripping device for performing a tripping operation in response to an over-current and having a latch, a switching device including a handle lever connected to the operation handle and having a support point at an end thereof; a toggle linkage interposed between the contact holder and the latch and having a connecting pin, and upper and lower links connected by the connecting pin; a spring disposed between the handle lever and the connecting pin; and a side plate for supporting the handle lever, the toggle linkage and the spring, and means for preventing the operation handle from moving to the OFF position when the movable contact is stuck to the fixed contact, said means including first stoppers formed on a cross bar of the contact holder and the handle lever facing the cross bar, respectively, and a second stopper formed on the side plate of the switching device for preventing a movement of the operation handle to the OFF position.