Tamperproof thermostats regulate heaters or signal devices based on temperature changes, with pre-set contact breakers for SFTO-011 and contact makers for SFTS-011.
Tamperproof (Pre-set) Thermostat SFTO-011
Contact breaker/NC (red casing) for regulating heaters or for switching signal devices when temperature has fallen below the minimum value. The contact opens when temperature is rising.
Tamperproof (Pre-set) Thermostat SFTS-011
Contact maker / NO (blue casing) for regulating filter fans, heat exchangers, cooling devices Or switching signal devices when temperature limit has been exceeded. The contact closes when temperaure is rising.