Circuit breaker

Details Circuit breaker Circuit breaker

1988-07-07

1989-07-11

Deboer, Todd E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 97, 340662, H02H 3093

Patent

active

048477257

ABSTRACT:
When a current of a distribution line is increased to about two times of a rated current of a circuit breaker, the circuit breaker is operated to open the distribution line with a comparatively long time lag such as 100 seconds by a long time-lag tripping circuit of the circuit breaker, on the other hand, in case that a current of 80-90% of the rated current have continuously flowed before the current is increased as mentioned above, the time lag which is set in the long time-lag tripping circuit is shortened.

REFERENCES:
patent: 4224651 (1980-09-01), Allen et al.
patent: 4347541 (1982-08-01), Chen et al.
patent: 4763220 (1988-08-01), Belbel et al.

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