Dual trip circuit for circuit breaker

Details Dual trip circuit for circuit breaker Dual trip circuit for circuit breaker

1992-03-06

1994-11-29

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

H02H 308

Patent

active

053695429

ABSTRACT:
A trip circuit for tripping a circuit breaker has a first coil having a relatively large number of turns and therefore a relatively slow reaction time and a second coil having a relatively small number of turns and therefore a relatively fast reaction time. The first coil is responsive to a relatively low current level through a circuit breaker for tripping the circuit breaker at the rated tripping current. The second coil is responsive to a higher current through the circuit breaker for tripping the circuit breaker with great rapidity in case the higher level is reached before the first coil has an opportunity to react.

REFERENCES:
patent: 4689712 (1987-08-01), Demeyer
patent: 4884164 (1989-11-01), Dziura et al.

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