TRIAC_SUPPRESSES_RELAY_ARCING

Published:2009/7/14 23:02:00 Author:Jessie | From:SeekIC

Circuit prevents arcing at contacts of relay for loads up to 50 A, by turning on as soon as it is fired by gate current; this occurs after S1 is closed but before relay contacts close. Once contacts are closed, load current passes through them rather than through triac. When S1 is opened, triac limits maximum voltage across relay contacts to about 1 V. Circuit permits use of smaller relay since it does not have to interrupt full load current.- Circuit Applications for the Triac, Motorola, Phoenix, AZ, 1971, AN-466, p 8.



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