Relay contact protector

Details Relay contact protector Relay contact protector

1975-10-22

1977-06-07

Albritton, C. L.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Arc suppression at switching point

338 22R, 338224, H02H 300

Patent

active

040285910

ABSTRACT:
A polyconductor device is connected in series with a pair of current carrying contacts of a relay switch to delay the current surge through the contacts during the closure thereof. The polyconductor device has a negative temperature-resistance characteristic such that its electrical resistance value at temperatures below a predetermined transition temperature is at least several orders of magnitude larger than its resistance value at temperatures above the transition temperature. When the contacts are initially closed, only a small electric current passes through the polyconductor device which is in its high resistance state. After a predetermined time, the current heats the device to a critical temperature at which time polyconductor device switches to its low resistance state and the current flows essentially unimpeded thereby. During the heat-up time the contacts of the relay switch have completed bouncing and are in a stable, closed condition.

REFERENCES:
patent: 493314 (1893-03-01), Thomson
patent: 3435398 (1969-03-01), Gielisse et al.
patent: 3650680 (1972-03-01), Teow et al.
Jacques C. Duchene et al., Initiation of Switching in VO.sub.2 Coplaner Devices, "IEEE Transactions on Electron Devices," vol. ED-18, No. 12, pp. 1151-1155, Dec. 1971.

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