Circuit breaker

Details Circuit breaker Circuit breaker

1981-01-14

1982-08-31

Eisenzopf, Reinhard J.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 96, 361 97, 361105, H02H 908

Patent

active

043475418

ABSTRACT:
A circuit breaker, having a latching mechanism and a solenoid senses current through a circuit. The sensed current is converted to a proportional voltage. A current rating plug and receptacle system, responsive thereto, provides a standardized voltage. The proportional voltage is applied across a resistor in series with parallel connected permanent shunt resistor and replaceable plug resistor. The standardized voltage is obtained across the parallel connection. A peak detector provides an approximate true peak value voltage of the standardized voltage. An instantaneous trip circuit, a ground fault detector, and both short term and long term delay circuits provide trip signals upon certain conditions. Upon the presence of any trip signal, an OR circuit provides a control signal to gate an SCR having a thermal switch coupled across its anode and cathode. A supply voltage is applied across a serial connection of the anode, the cathode, and the solenoid.

REFERENCES:
patent: 3165670 (1965-01-01), Baude
patent: 3317791 (1967-05-01), Price et al.
patent: 4038695 (1977-07-01), DePuy
patent: 4060844 (1977-11-01), Davis et al.
patent: 4149210 (1979-04-01), Wilson
patent: 4259706 (1981-03-01), Zocholl

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