The electromechanical hygrostat MRF012 is designed to control enclosure heaters , so that the dew point is raised when a critical relative humidity of 65% is exceeded. In this way condensation and corrosion is effectively prevented. Specifications: Switch difference:4% RH (3% tolerance) Permissible air velocity:15m/sec Contact type:change-over contact Contact resistance: 100 000 cycles Min. switching capacity: 20V AC/DC 100 mA Max. switching capacity: 250 VAC, 5 (1) A 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/Storage temperature: 0 to +60C (+32 to +140F) / -20 to +80C (-4 to +176F) 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