Circuit breaker

Details Circuit breaker Circuit breaker

1988-04-28

1989-07-18

Jennings, Derek S.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 93, 361 97, H01H 308

Patent

active

048498483

ABSTRACT:
A circuit breaker in which the levels of overload currents are detected with increased accuracy and which functions properly even just often its load-connecting contacts are closed. A rectifier circuit converts outputs from current transformers into currents flowing in one direction, the current transformers detecting the currents through main the paths. A power supply circuit and current-detecting resistors are connected in series with the output of the rectifier circuit. Differential amplifiers amplify the potential differences across each resistor. If the power from the power supply circuit is insufficient to operate the differential amplifiers and a timer normally, an inhibiting circuit prevents a switch circuit from being closed.

REFERENCES:
patent: 4443828 (1984-04-01), Legron et al.
patent: 4589052 (1986-05-01), Dougherty
patent: 4717985 (1988-01-01), Demeyer

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