Circuit breaker magnetic trip unit

Details Circuit breaker magnetic trip unit Circuit breaker magnetic trip unit

1987-09-04

1988-09-13

Shaw, Clifford C.

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Automatic circuit-interrupting devices

335203, 335236, H01H 7510, H01H 7706

Patent

active

047712546

ABSTRACT:
A magnetic trip unit for molded case circuit breakers includes a pair of U-shaped magnets opposedly arranged around a part of the circuit breaker load strap and the armature strap. Circuit current in excess of a threshold value displaces the armature strap, causing it to articulate the circuit breaker operating mechanism to interrupt the circuit current.

REFERENCES:
patent: 3421123 (1969-01-01), Johnson et al.
patent: 4609898 (1986-09-01), Seymour et al.
patent: 4679016 (1987-07-01), Ciarcia et al.
patent: 4706054 (1987-11-01), Hampton et al.

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