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The mechanism of KSD series snap action thermostat is based on a snap-action bimetallic, which opens or closes the electric contacts when the predetermined temperature is met. When the electric device works normally, the switch is closed. Once the temperature reaches the limit point, the bimetallic works immediately to open the contacts and thus switching off the circuit. After the device has cooled down to the allowable temperature, the snap disc thermostat will reset automatically.