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689REGULATING & MONITORINGMECHANICAL HYGROSTATDATA SUBJECT TO CHANGE WITHOUT NOTICE.Technical DataEfficient condensation control Adjustable relative humidity range High switching capacity DIN rail mountableThe MFR 012 electromechanical hygrostat is designed to control the relative humidity inside enclosures. When connected to an enclosure heater (dehumidifier), it will energize the heater at the humidity set point in order to raise the dew point. This helps prevent damage and malfunction of electronic components caused by condensation and corrosion.%u00b9 The MFR 012 can also be used to control cooling fans, warning lights or other devices. %u00b9 The critical relative humidity level for most components is 65%. Above 65% RH, condensation can form and cause malfunctions of electronic equipment. Long term, this can lead to corrosion and permanent damage of electronic components and systems.Switching difference 4% RH (%u00b1 3% tolerance) - at 50% RH Permissible air velocity 50 ft/sec (15m/s)Contact type SPDT / change-over contactService life > 50,000 cycles Min. Switching capacity 100mA @ AC/DC 20V Max. Switching capacity 5 A resistive @ AC 250 V DC 20WConnection 3-pole terminal, clamping torque 0.5Nm max.: solid wire - AWG 14 max. (2.5mm%u00b2) stranded wire%u00b9 - AWG 16 max. (1.5 mm%u00b2) (1.5mm%u00b2) Housing plastic, UL 94V-0, light greyMounting clip for 35mm DIN rail, EN 60715Mounting position verticalOperating / Storage temperature 32 to 140 %u00b0F (0 to 60 %u00b0C) / -40 to 140 %u00b0F (-40 to 60 %u00b0C) Operating / Storage humidity max. 95 %RH (non-condensing)Dimensions 2.64 x 1.97 x 1.5%u201d (67 x 50 x 38mm) Weight approx. 2 oz. (60g) Protection type IP20 Approvals UL File No. 164102, GOST-R%u00b9 When connecting with stranded wires, wire end ferrules must be used.Part No. Setting range01220.0-00 35 to 95% RHEnclosure heaterFilter fan, cooling equipment, signal device