CIRCUIT BREAKER WITH INTERCHANGEABLE RATING ADJUSTER AND INTERLOCK MEANS

摘要

46,788 CIRCUIT BREAKER WITH INTERCHANGEABLE RATING ADJUSTER AND INTERLOCK MEANS A circuit breaker comprises an adjustable trip unit having electronic circuitry for initiating a tripping command upon detection of overcurrent conditions. The trip unit includes an externally accessible interchangeable plug in rating adjuster removably supported on the housing of the circuit breaker and secured by a threaded rod and tube. An interlock mechanism cooperates with the trip bar of the circuit breaker mechanism to insure that only when a compatible rating adjuster is properly seated in the housing and the threaded rod is completely engaged within the threaded tube will the circuit breaker mechanism be removed from the trip-free condition. Coordination of a proper rating adjuster with a corresponding trip unit and circuit breaker is achieved by coordinating the lengths of the rod and tube and the position of the threaded portions thereof such that only a rating adjuster which is electrically compatible with a particular circuit breaker and trip unit will properly engage the threads of the tube to remove the circuit breaker from the trip-free condition.