Electronic Hygrostat
EFR 012

  • Adjustable and pre-set relative humidity
  • Status indicator (LED)
  • High switching capacity
  • Clip fixing
  • Temperature-compensated

The electronic hygrostat senses the relative humidity in an enclosure with electric/electronic components and turns on a heater at the set point, helping prevent the formation of condensation in the enclosure. The LED integrated in the adjustment knob is lit when the connected heater is in operation.

Technical Data

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Switch difference5% RH (±3% RH tolerance) at +25°C (+77°F), 50% RH
Reaction time5 sec.
Contact typechange-over contact (relay)
Service life> 50,000 cycles
Max. switching capacity (relay output)240VAC / 120VAC 8 (1.6) A
DC 100W at 24VDC
Max. inrush currentAC 16A for 10 sec.
Optical indicatorLED
Connection5-pole terminal, clamping torque 0.5Nm max.:
rigid/stranded1 wire 2.5mm² (AWG 14)
Mountingclip for 35mm DIN rail, EN 60715
Casingplastic according to UL94 V-0, light grey
Dimensions64.5 x 42 x 38mm
Weightapprox. 70g
Fitting positionvertical
Operating/Storage temperature0 to +60°C (+32 to +140°F) / -20 to +70°C (-4 to +158°F)
Operating/Storage humiditymax. 90% RH (non-condensing)
Protection typeIP20

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

Art. No.Operating voltageSetting range                        Approvals
01245.0-00230VAC, 50/60Hz40 to 90% RHVDEUL File No. E164102EAC
01246.0-00230VAC, 50/60Hz65% RH pre-setVDEUL File No. E164102EAC
01246.0-01230VAC, 50/60Hz50% RH pre-setVDEUL File No. E164102EAC
01245.9-00120VAC, 50/60Hz40 to 90% RH-UL File No. E164102EAC
01246.9-00120VAC, 50/60Hz65% RH pre-set-UL File No. E164102EAC

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Technical drawing

Electronic Hygrostat EFR 012

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