Series 30000 Thermoswitch provides an on/off differential of +/-1oF (+/-0.55oC). The adjustable electromechanical controller does not require an external power source and responds rapidly to temperature changes. The controller uses the principle of differential expansion of metals to control internal electrical contacts and regulate temperature. This technique is accurate and linear from less than 50 to 600 oF (10 to 316oC). Typical applications include packaging machinery, industrial laminators and pressure washers.