Circuit breaker

Details Circuit breaker Circuit breaker

1990-12-03

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 87, 340664, H02H 3093

Patent

active

050863673

ABSTRACT:
A circuit breaker having the overcurrent tripping characteristic, which is capable of detecting an overcurrent flowing through main circuit between an ac source and a load. The circuit breaker comprises a pre-alarm circuit having a pre-alarm characteristic, a pre-alarm signal output circuit for producing an alarm in response to the output of the pre-alarm circuit and a photocoupler for controlling the data transmission between the circuits. The circuit breaker can detect the main circuit current before it becomes an overcurrent and generate the alarm accurately.

REFERENCES:
patent: 3775675 (1973-11-01), Freeze et al.
patent: 4193104 (1980-03-01), Nercessiah
patent: 4335437 (1982-06-01), Wilson et al.
patent: 4558310 (1985-12-01), McAllise
patent: 4713718 (1987-12-01), Quayle
patent: 4860153 (1989-08-01), Ishii

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