Arc suppressor circuit

Details Arc suppressor circuit Arc suppressor circuit

1979-01-31

1981-02-17

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Arc suppression at switching point

361 13, 307135, H02H 722

Patent

active

042518458

ABSTRACT:
An arc suppression device for protecting the load carrying contacts (25) of a power contactor (15) includes semiconductor devices (TR1, SCR1,SCR2) connectable in parallel with such contacts through an isolation relay (37,61). Gating current to the semiconductor device is applied after the isolation relay is energized and prior to, during and after the power contacts either close or open; but gating current is not continued after the power contacts have closed to protect the semiconductor against damage. Current to the semiconductor is applied before current is applied to or removed from the coil or solenoid (20) of the power contactor. In one embodiment, relays (39,41,43) within the arc suppression circuit (30) control the isolation relay (37), gating current to the semiconductor (TR1) and the coil of the power contactor in the proper sequence. In another embodiment, time delay means (C4-C7,R1) associated with the relays (61,63,65,67) control their sequence of operation.

REFERENCES:
patent: 3260894 (1966-07-01), Denault
patent: 3555353 (1971-01-01), Casson
patent: 3639808 (1972-02-01), Ritzow
patent: 3982137 (1976-09-01), Penrod
patent: 4025820 (1977-05-01), Penrod
patent: 4068273 (1978-01-01), Metzler

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