Circuit breaker

Details Circuit breaker Circuit breaker

1991-03-14

1997-07-22

Wong, Peter S.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

340661, 324509, H02H 308, G08B 2100

Patent

active

056509073

ABSTRACT:
An electronic circuit breaker is provided with a plurality of air coils, each of which is coupled to a main circuit and an overcurrent signal integrating circuit which receives the output of the air coil to output an overcurrent signal when the current through the main circuit exceeds a predetermined value. A current signal simulating an overcurrent in the main circuit is fed from an external testing device into a current signal receiving terminal (CST). A test voltage generating resistor (TVGR) is connected between the CST and ground. The current signal flows through the TVGR to develop a test voltage across the TVGR. Thus, the overcurrent signal integrating circuit simulates the overcurrent signal on the basis of the test voltage.

REFERENCES:
patent: 3924160 (1975-12-01), Maier et al.
patent: 4414601 (1983-11-01), Conroy
patent: 4558310 (1985-12-01), McAllise
patent: 4714975 (1987-12-01), Dvorak
patent: 4761704 (1988-08-01), Fraisse
patent: 4874603 (1989-10-01), Ishii

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