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Results tagged with relay
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user 3077
A relay is an electrically controlled switch. Electromechanical relays use an electromagnet to activate mechanical contacts, solid-state relays use semiconductor switches.
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Is "humming" normal in an AC relay?
I have a 240V relay that uses a 120VAC coil. When I switch power to the coil, the relay makes a faint humming sound. It isn't very loud, and sounds like a transformer almost. … So I am wondering if I have a bad relay, or if this is normal for AC relays, which I haven't used before. I am used to 12VDC relays for the record. …
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