They have any number of useful applications for semi-fixed appliances.
I just put one on the tankless hot water heater a couple of weeks ago and think I will install one for the air compressor in the garage.
This is for things you want to leave plugged in but want to be able to turn off. The air compressor could use one because it is seldom used and automatically turns itself on at odd times, usually at 0300.
Use it and shut it off.

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