NO and NC in one casing
Separate adjustable temperatures
High switching capacity
Terminals easily accessible
Clip fixing
Thermostat ( contact breaker, normally closed ) for regulating heaters.
Thermostat ( contact maker, normally open ) for regulating filter fans and heat exchangers or switching signal devices when temperature limit has been exceeded.
Heaters and cooling equipment can be switched independently from each other with a temperature offset as opposed to the usual change-over contacts.