Circuit breaker with improved magnetic trip response

Details Circuit breaker with improved magnetic trip response Circuit breaker with improved magnetic trip response

1994-08-02

1996-02-27

Donovan, Lincoln

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Tripping means

335167, H01H 900

Patent

active

054952190

ABSTRACT:
An industrial-rated circuit breaker includes an electronic trip unit for long time, short time and instantaneous overcurrent protection. Current transformers contained within the circuit breaker enclosure sample the circuit current and supply the trip unit with signals indicative of the circuit current in real time. Upon receipt of an overcurrent condition the trip unit actuates the circuit breaker operating mechanism to separate the circuit breaker contacts for circuit interruption. A supplemental magnet trip actuator interacts with the current transformer and the operating mechanism to provide enhanced short circuit response.

REFERENCES:
patent: 4284968 (1981-08-01), Denoyelle et al.
patent: 4672501 (1987-06-01), Bilac
patent: 4808952 (1989-02-01), Berner
patent: 4864263 (1989-09-01), Castonguay
patent: 4907342 (1990-03-01), Castonguay
Morris et. al, "Induction Motor Protective Circuit Breaker Unit." U.S. Ser. No. 08/140,928 (Docket: 41PR-7065).

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