Fused circuit breaker

Claim 1

A fused circuit breaker comprising an insulating housing structure, a fused circuit breaker structure supported in said insulating housing structure, said fused circuit breaker structure comprising a pair of contacts, a trip bar structure supported for pivotal movement about a fixed pivot, trip means comprising a movable member automatically moving in response to overload current conditions above a first predetermined value to pivot said trip bar structure to the tripped position to effect opening of said contacts, a fuse structure in a mounted position and comprising an insulating fuse cover, a fuse supported on said insulating fuse cover and being in electrical series with said contacts, upon the occurrence of severe overload current conditions above a second predetermined value higher than said first predetermined value said fuse blowing to automatically interrupt the current through said contacts, said fuse structure being removable from said fused circuit breaker, safety trip means comprising a support bracket structure and a safety trip member supported on said support bracket structure for generally rectilinear movement, said safety trip means further including spring means biasing said safety trip member on said support bracket structure toward a tripping position, said fuse structure in the mounted position thereof maintaining said safety trip member in an inoperative position, upon removal of said fuse structure said spring means moving said safety trip member rectilinearly to a tripping position, said safety trip member including an actuating roller movable therewith, upon movement of said safety trip member to said tripping position said actuating roller engaging said trip bar structure to pivot said trip bar structure to the tripped position, said insulating housing being formed with slot means therein, and said safety trip means being a preassembled assembly supported on said insulating housing captured in said slot means.