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Mechanical Relay Quality

General Electronics - Badcaps Forums - www.badcaps.net
Yesterday i had to replace a relay i installed about 2.5 years ago

This relay i used in my thermostat to use 5VDC logic to control 27VAC logic

I had used the cheap relays you can get on ebay for about $0.50 each (Songle SRD-05VDC-SL-C)

It failed cause the contact plate on the load side became dirty from electrical arcing

here is a video showing how they are designed:


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