Touch-safe PTC Fan Heater
CSF 028 | 250 W, 400 W

  • Compact size
  • Integrated pre-set thermostat
  • Quiet operation
  • Heating power adjusts to ambient temperature
  • DIN rail or screw tab mount available

The CSF 028 fan heater prevents formation of condensation and provides evenly distributed interior air temperature in enclosures.  The touch-safe plastic housing and the small size makes it ideal for use in enclosures with a high packing density.  The heater is equipped with a fixed set point thermostat and is easily wired via external pressure clamps. Two different mounting options are available - DIN rail or screw tabs. The robust screw tab mounting is particularly suitable for applications with high vibration.

Heating elementPTC resistor - temperature limiting
Surface temperature250 W: max. 122 °F (50 °C), 400 W: max. 149 °F (65 °C)
each except upper protective grille at 68 °F (20 °C)
ambient temperature
Overheat protectionbuilt-in temperature limiter
Axial fan, ball bearingservice life 40,000 h at 104 °F (40 °C)
Axial fan, free blowing32 cfm (54 m³/h) @ AC 120 V; 26 cfm (45 m³/h) @ AC 230 V
Connection2-pole dual pressure clamp for solid wire AWG 14 max. (2.5 mm²),
stranded wire (with wire end ferrule) AWG 16 max. (1.5 mm²)
Housingplastic according to UL 94V-0, black
Mountingclip for 35 mm DIN rail, EN 60715 or screw mount (Ø 5.5 mm),
clamping torque 2 Nm max., washers must be used
Mounting positionvertical airflow (air outlet up), horizontal airflow
Dimensionsmodels with DIN clip: 4.13 x 3.35 x 4.65" (105 x 85 x 118 mm),
models w/ screw tabs: 4.13 x 4.53 x 4.25" (105 x 115 x 108 mm)
Weight17.6 oz. (500 g)
Operating / Storage temperature-40 to +158 °F (-40 to +70 °C) / -49 to +158 °F (-45 to +70 °C)
Operating/Storage humiditymax. 90 %RH (non-condensing)
Protection class / Protection typeII (double insulated) / IP20
ApprovalsUL File No. E150057, VDE, EAC

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Part No. - DIN mountPart No. - screw tab mountOperating voltageHeating capacity¹Inrush current max.Recommended pre-fuse T (time-delay)Switch-off temperature²Switch-on temperature²
02821.9-0602821.9-08AC 120 V, 50/60 Hz250 W6.0 A10.0 A59 °F (15 °C)41 °F (5 °C)
02821.9-0902821.9-11AC 120 V, 50/60 Hz250 W6.0 A10.0 A77 °F (25 °C)59 °F (15 °C)
02820.9-0602820.9-08AC 120 V, 50/60 Hz400 W9.0 A10.0 A59 °F (15 °C)41 °F (5 °C)
02820.9-0902820.9-11AC 120 V, 50/60 Hz400 W9.0 A10.0 A77 °F (25 °C)59 °F (15 °C)
02821.0-0602821.0-08AC 230 V, 50/60 Hz250 W9.0 A10.0 A59 °F (15 °C)41 °F (5 °C)
02821.0-0902821.0-11AC 230 V, 50/60 Hz250 W9.0 A10.0 A77 °F (25 °C)59 °F (15 °C)
02820.0-0602820.0-08AC 230 V, 50/60 Hz400 W15.0 A16.0 A59 °F (15 °C)41 °F (5 °C)
02820.0-0902820.0-11AC 230 V, 50/60 Hz400 W15.0 A16.0 A77 °F (25 °C)59 °F (15 °C)

¹ at 68 °F (20 °C) ambient temperature; ² tolerance of ±5 K
Note: Other Switch-off and Switch-on temperatures on request

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Dimensioned Drawings - DIN rail mount

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Screw tab mount