A thermostat switch is an electrical component that automatically opens or closes a circuit when it reaches a specific temperature. It's a vital component used for both temperature regulation and safety. For example, it can cycle a cooling fan on and off to maintain optimal temperature, or it can cut power to a component to prevent overheating. It's small but vital. So, if your thermostat switch fails, it's cost-effective and worth replacing.
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A temperature sensor measures temperature and reports it electronically, while a thermostat switch physically opens or closes a circuit based on temperature.
Signs of a failing thermostat switch include being stuck open, which prevents the device from turning on, and being stuck closed, causing the device to run continuously and overheat.
A thermal fuse differs from a thermostat switch; it is a one-time safety device that permanently opens the circuit at dangerous temperatures and must be replaced, whereas a thermostat switch cycles on and off to regulate temperature.