What Is the SL5708 Refrigerator Defrost Thermostat

The SL5708 refrigerator defrost thermostat is a commercial-grade SPST (Single Pole Single Throw) bimetal disc control designed to regulate defrost cycles in refrigeration systems. When frost and ice accumulate on evaporator coils, this thermostat closes the heater circuit to initiate the defrost cycle and opens the circuit once the coil temperature rises above a preset setpoint—preventing excessive defrosting and protecting the refrigeration equipment from damage.

The SL5708 is a 2-wire device that serves as a defrost termination and heater limit control. It is commonly used in commercial ice makers, walk-in coolers, reach-in refrigerators, and freezers across supermarkets, restaurants, and cold storage facilities.