Circuit breaker

Details Circuit breaker Circuit breaker

1975-05-22

1977-09-06

Broome, Harold

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Automatic circuit-interrupting devices

335 35, 337 71, H01H 7348

Patent

active

040471349

ABSTRACT:
A molded case circuit breaker having thermal and magnetic trip means. A moving contact support structure is disposed about the magnetic trip means so as to cause current flowing through the circuit breaker contacts to pass twice through the magnetic circuit of the magnetic trip means. The moving contact support structure includes resistance material operable upon overcurrent conditions through the contacts to aid in heating the thermal trip means. An operating mechanism includes an operating spring in compression which acts as one leg of a toggle linkage and stores energy to operate the contacts with a snap action.

REFERENCES:
patent: 2659783 (1953-11-01), Casey
patent: 2925481 (1960-02-01), Casey
patent: 3462716 (1969-08-01), Yorgin et al.

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