The JUMO frostTHERM-AT/-DR Type 604100 frost-protection thermostat monitors temperature in ventilation and air conditioning systems to prevent damage caused by frost; direct switching of loads up to 16A at 230V AC is possible. The safety temperature limiter automatically locks if the temperature drops and can only be unlocked manually once the temperature has risen again.
JUMO GmbH & Co. KG; www.jumo.net