Prealarm circuit breaker

Details Prealarm circuit breaker Prealarm circuit breaker

1991-03-14

1992-02-04

DeBoer, Todd E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 97, 340664, H02H 308

Patent

active

050863665

ABSTRACT:
In a prealarm circuit breaker which can issue a prealarm signal before occurrence of trip, a pair-transistor is employed in a charging circuit of a pair of capacitors, one of which serves to make a time delay after pickup of an overcurrent and the other of which serves to make a time delay pickup of a current of prealarm level.

REFERENCES:
patent: 4752853 (1988-06-01), Matsko
patent: 4866558 (1989-09-01), Ishii

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