Set up one of these (40-C version) to control the fan in my TV/media center cabinet. This should reduce dust buildup in the case compared to running the fan continuously. I put this switch between my receiver and my DVD player, it's one of the warmest places. Within a few days, I noticed that the fan turns on when we're using the device and turns off when we're not using it. Excellent! I can confirm that one of the wires has a low resistance connection to the metal body of the item, so I chose to leave the silicone grommet in place to ensure stray currents don't flow in or out of other metal objects. All in all, this seems like a cheap and easy way to add a temperature switch to a device.
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