Molded case circuit breaker with linear responsive unit

Details Molded case circuit breaker with linear responsive unit Molded case circuit breaker with linear responsive unit

1991-05-16

1992-09-08

Donovan, Lincoln

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Automatic circuit-interrupting devices

335 21, 335 43, H01H 7512

Patent

active

051461951

ABSTRACT:
A molded case circuit breaker utilizes a thermally responsive trip unit for providing long and short-time overcurrent protection and a magnetically responsive trip unit for instantaneous or short-circuit protection. An electrically and thermally insulative lever interfaces between the thermal element and the circuit breaker trip response bar to linearize the movement of the thermal trip element in response to circuit current.

REFERENCES:
patent: 3936780 (1976-02-01), Hennemann
patent: 4503408 (1985-03-01), Mrenna et al.
patent: 4513268 (1985-04-01), Seymour et al.
patent: 4679016 (1987-07-01), Ciarcia et al.

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