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These teensy multi-protocol relays work with every platform.
Shelly’s Gen4 relays start at $18 and can automate anything that’s wired, from light switches and garage door openers to ...
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To clarify, the 240v required by the dust collector is switched on via a 120v relay. - MSN
The 120v relay draws power from the switched light circuit. When the lights are off its impossible for someones garage door opener, or any stray signal, to turn on the collector unintentionally ...