Bistable undervoltage release circuit for circuit breakers

Details Bistable undervoltage release circuit for circuit breakers Bistable undervoltage release circuit for circuit breakers

1984-11-23

1987-06-23

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

361 86, 361156, 361205, H02H 324

Patent

active

046757767

ABSTRACT:
A control circuit combined with a magnetically bistable solenoid armature provides a bistable undervoltage release function to a circuit breaker. The solenoid is fabricated from a material having high magnetic remnance and low coercivity. A first signal to the solenoid coil develops a high remnance flux to hold the armature against a spring force. A second signal, of opposite polarity and predetermined voltage, produces an opposing magnetic flux to cancel that retained by the solenoid. The armature then becomes extended under the influence of a charged spring to trip the breaker.

REFERENCES:
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patent: 3950675 (1976-04-01), Weber et al.
patent: 4011484 (1977-03-01), Paice et al.
patent: 4016518 (1977-04-01), Lang et al.
patent: 4068276 (1978-01-01), Pintell
patent: 4097831 (1978-06-01), Jencks et al.
patent: 4206430 (1980-06-01), Rusch et al.
patent: 4527216 (1985-07-01), Stammely

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