KSD301 series snap-action thermostat is a kind of miniature hermetically sealed bimetal thermal protector (1/2" disc). It is of single-pole single-throw structure and works under resistive load. KSD301 series is in wide use in a great variety of compact type home appliances, such as coffee maker, water dispenser, toaster, microwave oven, electric pad and portable icebox etc., to provide temperature control or temperature protection.