CSF 028 | 250W, 400W

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  • Small, compact design
  • Integrated pre-set thermostat
  • Dynamic heating up
  • Touch-safe
  • Quick connection
  • Clip or screw flange fixing

The compact fan heater prevents formation of condensation and provides an evenly distributed interior air temperature in enclosures with electric/electronic components. The touch-safe plastic housing and the small dimensions makes it ideal for use in enclosures with high packing density.The CSF 028 is equipped with a pre-set thermostat. It is connected via external clamps. The fan heater is available with two different mounting systems - either mounting by screw flange or by clip. The robust screw flange fixing is particularly suitable for applications with high vibration.



Heating element PTC resistor - temperature limiting
Surface temperature 250W: max. +50°C (+122°F), 400W: max. +65°C (+149°F)
each except upper protective grille at +20°C (+68°F)
ambient temperature
Temperature safety cut-out to protect against overheating in case of fan failure, automatic reset
Axial fan, ball bearing air flow, free flow
CSF 028: 45m³/h (230VAC), 54m³/h (120VAC)
service life 40,000h at +40°C (+104°F)
Connection 2-pole dual pressure clamp for rigid wire 2.5mm²,
stranded wire (with wire end ferrule) 1.5mm²
Casing plastic according to UL94 V-0, black
Mounting clip for 35mm DIN rail, EN 60715 or screw fixing (Ø 5.5mm),
clamping torque 2Nm max., washers have to be used
Fitting position vertical airflow (air outlet up), horizontal airflow
Dimensions models with clip fixing: 105 x 85 x 118mm,
models with screw flange fixing: 105 x 115 x 108mm
Weight 0.5kg
Operating/Storage temperature -40 to +70°C (-40 to +158°F)/-45 to +70°C (-49 to +158°F)
Operating/Storage humidity max. 90% RH (non-condensing)
Protection type/Protection class IP20 / II (double insulated)
Approvals VDE, UL File No. E150057, EAC
Art. No. clip fixing Art. No. screw flange fixing Operating voltage Heating capacity¹ Inrush current max. Recommended
pre-fuse T (time-delay)
Switch-off temperature² Switch-on temperature²
02821.0-06 02821.0-08 230VAC, 50/60Hz 250W 9.0A 10.0A +15°C (+59°F) +5°C (+41°F)
02821.0-09 02821.0-11 230VAC, 50/60Hz 250W 9.0A 10.0A +25°C (+77°F) +15°C (+59°F)
02820.0-06 02820.0-08 230VAC, 50/60Hz 400W 15.0A 16.0A +15°C (+59°F) +5°C (+41°F)
02820.0-09 02820.0-11 230VAC, 50/60Hz 400W 15.0A 16.0A +25°C (+77°F) +15°C (+59°F)
02821.9-06 02821.9-08 120VAC, 50/60Hz 250W 6.0A 10.0A +15°C (+59°F) +5°C (+41°F)
02821.9-09 02821.9-11 120VAC, 50/60Hz 250W 6.0A 10.0A +25°C (+77°F) +15°C (+59°F)
02820.9-06 02820.9-08 120VAC, 50/60Hz 400W 9.0A 10.0A +15°C (+59°F) +5°C (+41°F)
02820.9-09 02820.9-11 120VAC, 50/60Hz 400W 9.0A 10.0A +25°C (+77°F) +15°C (+59°F)

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


Air duct for improved heat distribution

The air duct is an accessory part for use with the fan heater CSF 028. It can easily be clipped onto the protective grille of the fan heater without use of any tools, and diverts the exiting warm air by 45°. This results in an overall improved heat distribution within an enclosure or cabinet. The temperature above the protective grille is reduced by up to 20 °C (measured 100 mm above protective grille) and may make the use of a heat conduction plate obsolete.

Art. No. Dimensions² Plastic 1 Packing unit Weight (approx.)
252017 85 x 85 x 12 mm according to UL94 V-0, black 1 piece 35 g

² Dimensions when mounted on fan heater.

Air duct Art. No. 252017

Fan heater with air duct