Auxiliary feature modules for circuit breakers

Details Auxiliary feature modules for circuit breakers Auxiliary feature modules for circuit breakers

1979-01-22

1981-01-20

Broome, Harold

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Automatic circuit-interrupting devices

335 10, 335 26, H01H 8300

Patent

active

042465583

ABSTRACT:
Both undervoltage and shunt trip auxiliary feature modules, adapted to be mounted side-by-side with one or more circuit breaker modules include an electromagnetic trip device having a trip actuator which is biased toward tripping position and is normally latched in a reset position. A lost motion connection interconnects the actuator with a trip member which is in direct driving engagement with the releasable latch for the automatic trip means of the circuit breaker so that when the actuator is released, movement thereof is transmitted through the trip member to the circuit breaker latch for tripping of the latter. Each auxiliary feature module also includes a reset member which acts to automatically reset the actuator after each tripping operation thereof. The reset member is in direct driving engagement with the cradle of the circuit breaker contact operating mechanism so that movement of the cradle towards its tripped position will operate the reset member in a direction to reset the actuator. A spring in the auxiliary feature module biases the reset member in resetting direction when the cradle is released and in so doing tends to prevent cradle rebound from its tripped position. However, this spring is connected to the reset member in such a manner that when the cradle is reset the line of action of the spring is so positioned that this spring does not contribute to loading of the circuit breaker trip latch.

REFERENCES:
patent: 3717792 (1973-02-01), Gryctko
patent: 4041423 (1977-08-01), Ophaug et al.
patent: 4079346 (1978-03-01), Rys
patent: 4090157 (1978-05-01), Rys
patent: 4112270 (1978-09-01), Rys
patent: 4114122 (1978-09-01), Grenier

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