Mechanical Hygrostat
MFR 012

  • Adjustable relative humidity
  • Change-over contact
  • High switching capacity
  • Easily accessible terminals
  • Clip fixing

The electromechanical hygrostat 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 in enclosures with electric/electronic components is effectively prevented.

Technical Data

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Switch difference¹4% RH (±3% tolerance)
Permissible air velocity15m/sec.
Contact typechange-over contact
Service life> 50,000 cycles
Min. switching capacity20VAC/DC 100mA
Max. switching capacity250VAC, 5A
DC 20W
Connection3-pole terminal for 2.5mm², clamping torque 0.5Nm max.:
rigid wire 2.5mm² (AWG 14)
stranded wire² 1.5mm² (AWG 16)
Mountingclip for 35mm DIN rail, EN 60715
Casingplastic according to UL94 V-0, light grey
Dimensions67 x 50 x 38mm
Weightapprox. 60g
Fitting positionvariable
Operating/Storage temperature0 to +60°C (+32 to +140°F) / -40 to +60°C (-40 to +140°F)
Operating/Storage humiditymax. 95% RH (non-condensing)
Protection typeIP20
ApprovalsUL File No. E164102, EAC

¹ at 50% RH

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² When connecting with stranded wires, wire end ferrules must be used.

Art. No.Setting range
01220.0-0035 to 95% RH

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Technical Drawing

Mechanical Hygrostat MFR 012

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