ELECTRONIC_FUSE

Published:2009/7/14 4:03:00 Author:May | From:SeekIC

Combination of SCR and line relay gives faster action than circuit breaker for protection against current overload. Closing S1 momentarily energizes relay, completing current path from supply to load. Overload current increases voltage drop across R1 to above 0.65 v, switching on SCR and thereby shorting relay coil to make it open. S1 must be pressed again to reset relay. For adjustable dropout, gate of SCR can be connected to pot placed across R1.-R. Quong, Resettable Electronic Fuse Consists of SCR and Relay, Electronics, Sept. 15, 1977, p117.



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