Solid state tripping circuit

Details Solid state tripping circuit Solid state tripping circuit

1976-02-17

1977-11-29

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 98, H02H 308

Patent

active

040608441

ABSTRACT:
A solid state tripping circuit for sensing overcurrent conditions in a circuit connecting a power source to a load circuit and for controlling the operation of a circuit breaker in series in the circuit. The tripping circuit is responsive to different levels of current flow in the protected circuit to actuate the circuit breaker to the open condition after a variable time delay. The duration of the delay time is a function of the ratio of the overcurrent sensed to the rated circuit current. Energy for operation of the tripping circuit is supplied directly by the sensing circuit to eliminate a separate power supply.

REFERENCES:
patent: 3327171 (1967-06-01), Lipnitz et al.
patent: 3444434 (1969-05-01), Zocholl
patent: 3786311 (1974-01-01), Hobson et al.
patent: 3924160 (1975-12-01), Maier et al.
patent: 3956670 (1976-05-01), Shimp et al.

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