CIRCUIT BREAKER

摘要

A circuit breaker having a small-sized handle arm (59), wherein a handle (62) is prevented from moving to the open circuit position when a movable contact (44a) and a stationary contact (43a) are fused. A toggle link mechanism (58) includes a link (54) opposed to the handle, and the link (54) is provided with a cam (54a). When the handle (62) is moved to the open circuit position at the time of fusing of the contacts, the cam (54a) is engaged with a bent portion (59a) of the handle arm (59) and prevents the movement of the handle (62) to the open circuit position.