Electronic Hygrostat
EFR 012

  • Adjustable & pre-set relative humidity setpoints
  • Compact design
  • High switching capacity
  • Optical function display (LED)
  • DIN rail mountable

The EFR 012 electronic hygrostat senses the relative humidity in an enclosure  and turns on a heater at the set point, helping prevent the formation of condensation in the enclosure. The integrated LED is lit when the connected device is in operation.

Technical Data

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Switching difference5 %RH (± 1 % tolerance) - at 77 °F (25 °C) and 50 %RH
Reaction timeapprox. 5 seconds
Contact typeSPDT / change-over contact (relay)
Service life> 50,000 cycles
Max. switching capacity (relay output)8 A resistive / 1.6 A inductive @ AC 120 V
8 A resistive / 1.6 A inductive @ AC 240 V
100 W @ DC 24 V
Max. inrush currentAC 16 A for 10 sec.
Connection5-pole terminal, clamping torque 0.5 Nm max.:
solid/stranded1 wire - AWG 14 max. (2.5 mm²)
Housingplastic, UL 94V-0, light grey
Mountingclip for 35 mm DIN rail, EN 60715
Mounting positionvertical
Operating / Storage temperature+32 to +140 °F (0 to +60 °C) / -4 to +158 °F (-20 to +70 °C)
Operating / Storage humiditymax. 90 %RH (non-condensing)
Dimensions2.54 x 1.65 x 1.5” (64.5 x 42 x 38 mm)
Weightapprox. 2.3 oz. (65 g)
Protection typeIP20

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¹ When connecting with stranded wires, wire end ferrules must be used.

Part No.Operating voltageSetting range                       Approvals
01245.0-00AC 230 V, 50/60 Hz40 to 90 %RHUL File No. E164102VDEEAC
01245.9-00AC 120 V, 50/60 Hz40 to 90 %RHUL File No. E164102-EAC
01246.0-00AC 230 V, 50/60 Hz65 %RH pre-setUL File No. E164102VDEEAC
01246.0-01AC 230 V, 50/60 Hz50 %RH pre-setUL File No. E164102VDEEAC
01246.9-00AC 120 V, 50/60 Hz65 %RH pre-setUL File No. E164102-EAC

Dimensioned Drawing

Electronic Hygrostat EFR 012