FLH 020 LST – FLH 030 LST – FLH 050 LST

Surface temperature-limited radiant heaters

The FLH series of radiant heaters with limitation of the radiator surface temperature consists of three versions with heating performance ratings of 20, 30 and 50 Watts. Typical applications are to be found within building installations, where accidental contact with radiant heaters inside control cabinets is possible, where safety regulations prohibit open sources of heat, or where neighbouring structural elements are negatively influenced by the increased development of heat.

DIN rail mounting

multi voltage

extreme T conditions

Technical data

Heating performance (Ta = +20 °C)20 W30 W50 W
Degrees of protection
for intended purpose of use
IP 44 (connecting cable) and IP 20 (plug terminal connector)
Operating temperature–40 … +70 °C / –40 … +158 °F
Storage temperature–40 … +70 °C / –40 … +158 °F
Type of mountingsnap fastening for 35 mm profile bars according to EN 60715

Further technical details and dimensions can be found in the download section on this page under product sheet.


Description Type Size
Conformity_CE_085506659_Rev21_Mar24_FLH010-150_PRH.pdf pdf 30 KB Download
Conformity_UKCA_085507002_Rev01_Mar24_FLH010-150_PRH.pdf pdf 25 KB Download
Manual FLH pdf 250 KB Download
Description Language Type Size Download

Product sheet

  • English
pdf 130 KB Download

Declaration of Conformity

  • German
  • English
pdf 44 KB Download

UL recognized certificate

  • English
pdf 160 KB Download

Further software tools for digital product integration into your planning and documentation (such as Eplan macros) can be found at MyPfannenberg.

Ordering details

Ordering detailsFLH 020 LSTFLH 030 LSTFLH 050 LST
with terminalArticle number170021050071700310500717005105007
with connecting cableArticle number170021050171700310501717005105017

Article numbers for other types on request.

Product Benefits

  1. 1


    Integrated snap fastening for 35 mm DIN-rail.

  2. 2

    Long life

    and robust construction without fan.

  3. 3


    Predominantly used in control cabinets for the avoidance of excessively low temperatures or excessively high relative humidity.

  4. 4

    Safe protection

    against condensate forming in the cabinet by means of fast heating due to PTC technology.

  5. 5

    Different performance ratings

    ensure that the correct heating power is always available. The total heat necessary can be distributed according to the needs.

  6. 6

    Electrical connection

    Depending on the existing connecting conditions, options are available with a 500 mm connecting cable or a plug terminal connector.