Novatek msk 301 8 freezer temperature and defrost control relay novatek msk 301 8 p the novatek msk 301 8 is designed to control freezers refrigerated counters and other refrigerated shop and industrial equipment by switching 1 or 2 compressors or fans on or off according to the temperature range selected depending on the temperature difference between the refrigerating chamber and fan air stream the relay can be programmed to start an automatic defrost cycle p p if fitted with a suitab