Circuit breaker with interchangeable rating adjuster and interlo

Details Circuit breaker with interchangeable rating adjuster and interlo Circuit breaker with interchangeable rating adjuster and interlo

1979-08-21

1981-11-03

Broome, Harold

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Automatic circuit-interrupting devices

200 50A, 335160, 361100, H01H 924, H01H 3348, H02H 308

Patent

active

042988527

ABSTRACT:
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 by a threaded rod and tube. An interlock mechanism cooperates with the trip bar of the circuit breaker and secured 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.

REFERENCES:
patent: 3826951 (1974-07-01), Mater et al.
patent: 4037184 (1977-07-01), Kempisty et al.

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