Solid state trip unit for an electrical circuit breaker

Details Solid state trip unit for an electrical circuit breaker Solid state trip unit for an electrical circuit breaker

1981-03-17

1983-04-19

Eisenzopf, Reinhard J.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 44, 361100, 361101, H02H 3093, H02H 310

Patent

active

043807852

ABSTRACT:
The invention concerns a solid state trip unit having long time delay, short time delay and ground fault trip circuits. It comprises a metering resistor (40) electrically connected in a series circuit (42) including additionally a power supply (44) for the trip circuits LR, CR and H, and a trip coil (22). A switch (52) connected in parallel with the coil (22) which may be either in an ON-state to shunt the coil (20), or in an OFF-state after a trip signal is delivered from one of the trip circuits, so as to cause an increase of the impedance of the series circuit (42) and the excitation of the trip coil (22). The trip unit can be applied to low-voltage circuit breakers.

REFERENCES:
patent: 3786311 (1974-01-01), Hobson, Jr. et al.
patent: 3818275 (1974-06-01), Shimp
patent: 4004201 (1977-01-01), DePuy
patent: 4038695 (1977-07-01), DePuy
patent: 4060844 (1977-11-01), Davis et al.
patent: 4068283 (1978-01-01), Russell
patent: 4153924 (1979-05-01), Moran

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