Means for arc suppression in relay contacts

Details Means for arc suppression in relay contacts Means for arc suppression in relay contacts

1986-10-01

1988-05-17

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Arc suppression at switching point

361 13, H02H 700

Patent

active

047455110

ABSTRACT:
In a circuit having a electro-mechanical relay the contacts of which are subject to arcing, a shunt across the electro-mechanical relay configured to begin conducting electrical current across the electro-mechanical relay prior to closing the electro-mechanical relay contacts and to continue conducting electrical power across the electro-mechanical relay for a predetermined time after the onset of separation of electro-mechanical relay contacts pursuant to discontinuance of current flow through the elecro-mechanical relay. An optical coupler is employed to detect the current flow through the relay coil and activate a shunt device to initiate current flow around the electro-mechanical relay. The shunt device is configured to be substantially non-current load carrying while the electro-mechanical relay is closed. Utility is found in protecting relay contacts against damage due to arcing.

REFERENCES:
patent: 4420784 (1983-12-01), Chen et al.
patent: 4438472 (1984-03-01), Woodworth

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