Small Geometry Self-Regulating Heating Cable for Freeze Protection

FINE SRF(s) Series for freeze protection generates heat by  a material of semi-conductor, showing a characteristic of  PTC (Positive Temperature Coefficient).

PTC is characterized by the power output of heating  cable adjusted to compensate for variations in ambient  temperature. It produces more heat if the temperature drops and less  heat if the temperature rises.

SRF(s) Series is a self-regulating cable heater, working on  the PTC principle, requiring low electrical consumption.

SRF(s) Series is most suitable for protection of plumbs and  pipes from freezing in winter.

Thanks to the small geometry (micro size), SRF(s) Series  provides the solutioin for in-pipe application.

Product construction

Product construction

1.Copper bus wire
2.Self-regulating conductive core
3.Inner adhesive jacket.
4.Modified polyolefin jacket
5.Tinned-copper braid
6.Modified polyolefin outer jacket (-CR) → for on pipe  
Fluoropolymer outer jacket (-CT) → for on/in pipe

Long life time (semi-permanent)

SRF(s) Series is post-treated under elevated temperature in annealing process to give its stability in long-term operation without losing heat output.

Low energy consumption

The electrical consumption of SRF(s) Series is low due to its unique PTC property.

Excellent heat resistance

SRF(s) Series is treated by irradiation crosslinking reaction, providing the same level of thermosetting property as XLPE.

Cut to length

The heat generator of SRF(s) Series is composed of the infinite parallel connection of carbon particles, allowing it to be cut to the exact length required.

Product characteristics and design information

Nominal power output 10, 16 W/M at 10℃
Max. maintenance temperature 65℃  
Max. intermittent exposure temperature 85℃  
Service voltage SRF(s)1 100 - 120 Vac  
SRF(s)2 200 - 240 Vac  

Fine Korea offers a full range of connection Kit and end seal Kit for Power connection, splices, and end seal. Also

offers the in-pipe sealing kit. These accessories must be used all together to ensure proper functioning of the product and compliance with warranty, code, and requirements of approvals.

Power output graph


Max. length (m) vs. Circuit breaker size

  110V 220V
10A 15A 20A 30A 10A 15A 20A 30A
SRF(s)10-CR/CT 10℃ 70 - - - 120 - - -
0℃ 60 75 - - 110 130 - -
-20℃ 45 50 60 - 80 90 100 -
SRF(s)16-CR/CT 10℃ 50 60 - - 85 100 - -
0℃ 45 50 60 - 80 95 100 -
-20℃ 30 40 50 60 60 75 90 100


Download the manual!