Self-Regulating Freeze Protection Cable

Self-Regulating Freeze Protection Cable
  • Self-Regulating, Energy Efficient
  • Max. Exposure Temp. 185°F (Power Off)
  • Cost Effective for Commercial Construction Freeze Protection Applications
  • Freeze Protection of Fire Protection System Piping
  • Industrial Grade, 16 AWG Buss Wire
  • Standard Braid and Optional Overjacket
  • Circuit Lengths, Up to 660 Ft.
  • 3, 5 and 8 W/Ft.
  • 120, 208 - 277 Volt From Stock
  • Approximate Size 3/8"W x 1/8"H
  • Minimum Bend Radius 1-1/8”
  • For Use on Metal and Plastic Pipes
  • Literature
    SRF Catalog Page

Chromalox SRF cable is ideal for keeping metal and plastic pipes warm in commercial construction and institutional buildings, some industrial freeze protection applications. SRF cable is constructed of a self-regulating polymer core that varies its output along its entire length, saving energy and eliminating hot spots along the pipe. Parallel construction makes it easier to install than zone or series types of cable since it can be cut-to-length at any point on the pipe.

  • Energy efficient, self-regulating SRF uses less energy when less heat is required.
  • Easy to install, SRF can be cut to any length (up to max. circuit length) in the field.
  • Field splices can be performed easily in minutes with no scrap or wasted cold sections.
  • SRF can be single overlapped without burnout, which simplifies heat tracing of in-line process equipment such as valves, elbows and pumps.

For more features refer to catalog page PDF to the right.


  • UL Listed for ordinary areas.
  • UL Listed for fire protection system piping
  • CSA Certified for ordinary areas.

  • Freeze Protection

Features of SRF Cable

  Max. Maintenance Temp. (°F)   100
  Max. Exposure Temp. (°F) Power Off   185
  Max. W/Ft.   8
  Max. Circuit Length (Ft.)   180 - 660
  Buss Wire Size   16
  Voltages   120, 208-277
  Hazardous Ratings   No
  Usable on Plastic Pipe   Yes
  Cut-to-Length in Field   Yes
  Field Splicable   Yes
  Can be Overlapped   Yes
  Output Varies with Temp.   Yes
 Varies Output Along Length   Yes
  Accessories   DL/EL/U
  Monitor Wire Available   No

SRF Corrosion Selection Guide

  Moisture   C, CR
  Aqueous Solutions of Inorganic Compounds   No
  Liquids Organic Chemicals Acids or Bases   No
 Acids or Bases   No
C - Tin-Plated copper metallic braid for additional protection and ground path
CT - Fluoropolymer corrosion resistant overjacket over braid for hostile/corrosive environments
CR- TPR overjacket over braid for protection against certain inorganic chemical solutions

This is a recommendation guide. Chromalox cannot warrant any Electric Heat Trace against failure by sheath degradation if such failure is the result of operating conditions beyond the control of the heater manufacturer. It is the responsibility of the purchaser to make the ultimate choice of sheath material based on knowledge of the chemical composition of the corrosive solution, character of materials entering the solution, and controls which maintains the process.

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Part # Description  
386943 SRF-3-1C 3W/FT 120V Buy Now
386951 SRF-3-2C 3W/FT 240V Buy Now
386100 SRF-3-1CR 3W/FT 120V Buy Now
386118 SRF-3-2CR 3W/FT 240V Buy Now
386960 SRF-5-1C 5W/FT 120V Buy Now
386978 SRF-5-2C 5W/FT 240V Buy Now
386142 SRF-5-1CR 5W/FT 120V Buy Now
386150 SRF-5-2CR 5W/FT 240V Buy Now
386986 SRF-8-1C 8W/FT 120V Buy Now
386994 SRF-8-2C 8W/FT 240V Buy Now
386062 SRF-8-1CR 8W/FT 120V Buy Now
386070 SRF-8-2CR 8W/FT 240V Buy Now
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