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Have a small space heater, < 20 amps, and need to turn it on . and off as it doesnt have a switch. Need to find a cheap option to switch it on and off "remotely" Put a switch in its power cord? Find an extension cord with a switch? Doesnt seem to be as many options for 240 volt, and its a bit pricey. How have you dealt with 240v switches?
And got the following answer:
You could use a regular 15amp light switch wired to control a double pole contactor (relay), this way the contactor handles breaking both hot wires to the heater and the toggle switch only has to carry the very small load the the contactor coil puts on it. If you tried to use a single pole switch you would be breaking only one hot wire which could cause problems in operation depending on how the heater is wired. It WILL cause a hazard for any future servicing of the heater since there would still be on hot leg present even with the switch off, so a double pole contactor is the way to go.