This mechanical hygrostat is designed to control the relative air humidity inside of enclosures. When connected to an enclosure heater (de-humidifier), it will turn the heater on at the set humidity level in order to raise the dew point. This helps prevent damage and malfunction of electronic components caused by condensation and corrosion. The MFR012 has a high switching capacity and is DIN rail mountable. This CE compliant product can also be used to control cooling fans, warning lights, or other devices.