Trip delay override for electrical circuit breakers

Details Trip delay override for electrical circuit breakers Trip delay override for electrical circuit breakers

1989-08-28

1990-08-14

Jennings, Derek S.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 96, 361 42, H02H 308

Patent

active

049492144

ABSTRACT:
An automatic override circuit is responsive to the magnitude of instantaneous current flow through a monitored conductor to produce an output signal which can actuate a solenoid or a ground fault interrupter to automatically trip a circuit breaker in repsonse to an excursion of current flow which exceeds a predetermined maximum current overhead level. The short circuit protector can automatically override a thermal trip delay and cause the circuit breaker to trip instantly or delay tripping for a prescribed period of short circuit events which exceed the maximum current overload level. In one embodiment, a control signal is generated which actuates a solenoid which is coupled to a thermal magnetic circuit breaker. In an alternative embodiment, the control signal is utilized for automatically triggering a ground fault interrupter. In both embodiments, the power distribution circuit is interrupted in response to a short circuit condition which would otherwise be tolerated during the thermal trip delay of a conventional circuit breaker.

REFERENCES:
patent: 3745369 (1973-07-01), Yamagata
patent: 3809962 (1974-05-01), Brown et al.
patent: 4001648 (1977-01-01), Takata et al.
patent: 4301491 (1981-11-01), Gryctko
patent: 4583004 (1986-04-01), Yearsin
patent: 4860153 (1989-02-01), Ishii

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