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Mechanical hygrostat - MFR 012


  • Simple installation
  • Change-over contact
  • High breaking capacity

Product description

High humidity in a cabinet produces condensation and corrosion, which often leads to creep currents, flash-over, contact problems, etc.

The difference in temperature between night and day can often be sufficient for condensation to form. To prevent this, besides a thermostat that starts a heater before the set minimum temperature is reached, a hygrostat should also be mounted that starts the heater/fan if the humidity exceeds a set value. MFR012 has a change-over contact and can even be used to control air humidifiers if the air becomes too dry.

Parts Price


MFR 012 Hygrostat, 35…95% RH, change over

Technical data

General data

Control range humidity from 35 % RF
Control range humidity to 95 % RF
Hysteresis humidity 4% RH
Mounting Clip on, DIN rail
Contact type Changeover (SPDT)
Colour Light grey

Rated operating conditions

Breaking capacity 250 VAC: 5 A. DC: 20 W.
Contact resistance <10 mΩ
Electrical lifetime > 50,000 cycles
Connection type 3-pole terminal for 2.5mm²
Operational Temperature 0 °C ... +60°C
Storage temperature -40°C ... +60°C
Life span > 50,000 cycles
Operating humidity < 90% RH
Humidity storage <95% RH


Height 67 mm
Width 50 mm
Depth 38 mm
Weight 0,06 kg
Material of body Plastic

Safety & approvals

IP class IP20
Approvals CE, cULus, EMC, RoHS, UL, UL E164102
Flammability class UL94-V0
EMC EN 55014-1-2, EN 61000-3-2, EN 61000-3-3


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