Test means for circuit breaker automatic trip mechanism

Details Test means for circuit breaker automatic trip mechanism Test means for circuit breaker automatic trip mechanism

1977-07-20

1979-05-01

Harris, George

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Automatic circuit-interrupting devices

335 46, H01H 7312

Patent

active

041526830

ABSTRACT:
A single pole molded case circuit breaker having a spring powered trip free contact operating mechanism including a releasable cradle, a latch for holding the cradle in reset position, and an automatic trip means for operating the latch to release the cradle upon the occurrence of predetermined overload conditions, is provided with test means for manually tripping the latch. The test means consists of an insulating depressible button accessible from outside the circuit breaker housing and connected directly to the latch by a formed wire link which also connects the latch to a trip member operated by thermal and magnetic elements of the automatic trip means.

REFERENCES:
patent: 3970975 (1976-07-01), Gryctko
patent: 4056816 (1977-11-01), Guim
patent: 4090158 (1978-05-01), Oeda

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