Pfannenberg FLH 060 Radiant Enclosure Heater, 10-150 W Range

Silent PTC radiant heaters for cabinet anti-condensation

The Pfannenberg FLH 060 belongs to the FLH family of radiant heaters, anodised aluminium profile heaters from 10 to 150 W that clip onto a 35 mm DIN rail. They have no fan and no moving parts, so they are silent and have a long service life. They are used with a thermostat or a hygrostat, mainly to avoid excessively low temperatures or excessively high humidity inside a control cabinet.

Because the PTC element heats quickly, a small heater is enough to keep cabinet air above the dew point and so to prevent condensation forming on terminals, relays and drives. The eight power ratings let the total required heat be split over several heaters placed where the enclosure needs it.

Technical specifications

Common data from the product sheet: rated voltage 230 V AC, 50/60 Hz, functional range 110-250 V AC (other voltages on request); operating and storage temperature -40 to +70 °C; protection IP 44 with connecting cable and IP 20 with plug terminal connector; protection class I; brightly anodised aluminium profile; snap fastening for 35 mm profile bars to EN 60715; plug terminal connector or 500 mm connecting cable.

Sizing and placing radiant heaters

A radiant heater warms the surrounding air by convection from the finned profile, so mounting position matters. Fit it in the lower part of the enclosure with free space above, keep it away from plastic cable ducts and temperature-sensitive components, and mind the maximum surface temperature shown in the table: a 150 W heater reaches 150 °C at the surface while a 10 W heater stays at 55 °C. Where a higher-power heater would be too hot for nearby parts, two smaller heaters spread the heat more evenly.

The manufacturer states that the correct power for an enclosure depends on its size, the ambient temperature range and the heat released by the devices inside, and offers a sizing software for this purpose. As a general engineering practice, the heater is switched by a thermostat set to about 10 °C and, where humidity is a concern, also by a hygrostat.

What to confirm before ordering

Confirm the supply voltage, the heater rating, and whether a plug terminal or a 500 mm cable is wanted, because they have different article numbers and protection ratings. The accessory table lists a thermostat (17111000000), a hygrostat (17207000000) and an internal enclosure fan (18110000000). Check the UL certificates listed on the manufacturer page for the exact variant if the project requires listed components.

How the Pfannenberg FLH 060 works

The heater has a PTC element inside an aluminium profile. The element heats fast when cold and limits its own power as it warms. The ribbed profile gives off heat to the air by convection, and the warm air rises through the cabinet. The heater has no fan. It is usually run with a thermostat or hygrostat that switches it on when the cabinet is cold or damp.

Where the FLH 060 is used

• Control cabinets
• Outdoor enclosures
• Terminal boxes
• Cabinets with drives and relays
• Sites with high humidity

Selection checklist for the FLH 060

• Heating power of 60 W
• Supply voltage of 230 V AC
• Starting current of 2.5 A
• Surface temperature of 105 degrees C
• Terminal or cable connection
• Thermostat or hygrostat
• Space in the lower part of the cabinet
• Number of heaters needed

Installation, commissioning and maintenance notes for the FLH 060

Clip the heater onto the 35 mm DIN rail in the lower part of the enclosure, with free space above it. Keep it away from plastic ducts and from parts that dislike heat. Wire it through a thermostat. Check the surface of the cabinet for condensation after the first cold night, and clean dust off the profile when the cabinet is open.

Requesting a quotation for the Pfannenberg FLH 060

Please send the cabinet size, the supply and the quantity. Seven Star LLC serves industrial customers in Oman and the GCC and replies with a quotation based on the information provided.

FLH 060 heating power

The heating power at 20 degrees C is 60 W.

FLH 060 starting current

The maximum starting current is 2.5 A.

FLH 060 surface temperature

The maximum surface temperature is 105 degrees C.

FLH 060 supply voltage

The rated voltage is 230 V AC at 50 or 60 Hz. The functional range is 110 to 250 V AC.

FLH 060 temperature range

The operating and storage range is minus 40 to plus 70 degrees C.

FLH 060 protection

The protection is IP 44 with the connecting cable and IP 20 with the plug terminal connector. The protection class is I.

FLH 060 mounting

The snap fastening fits 35 mm profile bars to EN 60715.

Heater records for the FLH 060

Record the cabinet number, the thermostat setting and the date of fitting.

Choosing the right FLH 060 power

Where one heater would be too hot for nearby parts, use two smaller heaters to spread the heat.

Documents and quotation

The Pfannenberg FLH radiant heater product sheet is attached to this page and is the manufacturer’s own document, not a Seven Star summary. It also contains the outline drawing: FLH 010 to 045 are 65 mm long, FLH 060 to 100 are 140 mm and FLH 150 is 215 mm, each 70 mm wide and 50 mm deep. Related thermal products are in HVAC & Combustion.

It covers all eight ratings, so give the exact model and connection type. Seven Star LLC, an independent supplier in Muscat, quotes the FLH 010 to FLH 150 against your application data; send the enclosure size, ambient temperature, supply voltage and quantity so the correct variant and article number can be confirmed before an offer is issued.