The electromechanical hygrostat MRF012 is designed to control enclosure heaters ,so that the dew point is raised when a critical relative humidity of 65 percent is exceeded. In this way condensation and corrosion is effectively prevented. Specifications: Switch difference:4 percent RH (3 percent tolerance) Permissible velocity:15m or sec Contact type:change-over contact Contact resistance: 100 000 cycles Min. switching capacity: 20V AC or for DC 100 mA Max. switching capacity: 250 VAC,5 (1) A for DC 20W EMC: acc. to EN 55014-1-2,EN 61000-3-2,EN 61000-3-3 Connection:3-pole terminal for 2.5mm2 ,clamping torque 0.5Nm max.: rigid wire 2.5mm2 ,stranded wire (with wire end ferrule) 1.5mm2 Mounting: clip for 35mm DIN rail,EN50022 Casing: plastic according to UL94 V-0,light grey Dimensions: 67 x 50 x 38mm Fitting position: variable Operarting or Storage temperature: 0 to and60C (and32 to and140F) or -20 to and80C (-4 to and176F) for Protection type: IP20 Note: Item color displayed in photos may be showing slightly different on your computer monitor since monitors are not calibrated same. Please allow 1-3mm slight deviation due to manual measurement. Thank you Package include: 1pc Humidity Controller