MFR 012 Mechanical hygrostat

MFR 012 Mechanical hygrostat
MFR 012 Mechanical hygrostat

Product Description

  1. Efficient condensation control
  2. Adjustable relative humidity range
  3. High switching capacity
  4. DIN rail mountable

The 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 mal-function of electronic components caused by condensation and corrosion. 1)
The MFR 012 can also be used to control cooling fans, warning lights or other devices.


Technic data

Switch difference*

4% RH (±3% tolerance)

Permissible air velocity


Contact type

change-over contact

Service life

> 50,000 cycles

Min. switching capacity

20V AC/DC 100 mA

Max. switching capacity

25VAC, 5A


DC 20W


3-pole terminal for 2.5mm², clamping torque 0.5Nm max.: rigid wire 2.5mm², stranded wire (with wire end ferrule) 1.5mm²


clip for 35mm DIN rail, EN60715


plastic according to UL94 V-0, light grey


67 x 50 x 38mm


approx. 60g

Fitting position


Operarting/Storage temperature

0 to +60°C (+32 to +140°F) / -40 to +60°C (-40 to +140°F)

Operating / Storage humidity

max. 90 % RH (non-condensing)

Protection type



UL File No. E164102

*at 50% RH



Art. No.

Setting range


35 to 95% RH



4.Example of connection:

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