Self-Regulating Medium Temperature

Self-Regulating Medium Temperature
  • Self-Regulating, Energy Efficient
  • 16 AWG Buss Wire
  • Circuit Lengths to 750 Feet
  • Process Temperature Maintenance to 302°F (150°C)
  • Maximum Continuous Exposure Temperature, Power Off, 420°F (215°C)
  • Industrial Process Maintenance Applications
  • Industrial Freeze Protection Applications
  • Single or Dual Monitor Wires Available
  • Steam Cleanable on Process Equipment Up to 300 PSIG
  • 5, 8, 10, 15 and 20 W/Ft.
  • 120 and 208 - 277 Volt From Stock
  • Approximate Size .47 in. W x .20 in. H
  • Minimum Bend Radius 1-1/8 in.
  • For Use on Metallic Pipes Only
  • Factory Mutual (FM) Approved, UL Listed, and CSA certified for ordinary areas.
  • ATEX, IECEx, FM, and CSA Approved for hazardous (classified) areas when used with U Series, HL, DL, and EL accessories.
  • Literature
    SRM/E Catalog Page
    DL Accessories Catalog Page
    U Series Accessories Catalog Page

Chromalox SRM/E self-regulating heating cable provides safe, reliable heat tracing for process temperature maintenance and freeze protection of pipes, valves, tanks and similar applications. Constructed of industrial grade 16 AWG buss wire with metal braid and optional overjacketing, SRM/E ensures operating integrity in most hostile industrial environments. The 420°F (215°C) maximum exposure temperature rating allows steam cleaning of process equipment with up to 300 psig steam.

WARNING — A ground fault protection device is required by NEC to minimize the danger of fire if the heating cable is damaged or improperly installed. A minimum trip level of 30mA is recommended to minimize nuisance tripping.


  • Energy efficient, self-regulating SRM/E uses less energy when less heat is required.
  • Easy to install, SRM/E 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.
  • With lower installed cost than steam tracing, SRM/E features less maintenance expense and downtime.
  • SRM/E can be overlapped without burnout, which simplifies heat tracing of in-line process equipment such as valves, elbows and pumps.
  • Because SRM/E is self-regulating, overtemperature conditions are minimized.
  • Chromalox termination, splice, tee and end seal kits reduce installation time.

  • Freeze Protection
  • Freeze Protection, High Exposure Temperature
  • Process Maintenance, Low Temperature
  • Process Maintenance, High Temperature

Features of SRM/E Cable

Max. Maintenance Temp. (°F) 302
Max. Exposure Temp. (°F) Power Off 420
Max. W/Ft. 20
Max. Circuit Length (Ft.) 750
Buss Wire Size 16
Voltages 120, 208-277
Hazardous Ratings Yes
Usable on Plastic Pipe No
Cut-to-Length in Field Yes
Field Splicable Yes
Can be Overlapped Yes
Output Varies with Temp. No
Varies Output Along Length No
Accessories DL/EL/U
Monitor Wire Available Contact Factory


SRM/E Corrosion Selection Guide

Moisture C, CT
Aqueous Solutions of Inorganic Compounds CT
Liquids Organic Chemicals Acids or Bases CT
Acids or Bases CT

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.

Select Parameters
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Part # Description  
388092 SRM/E 5-1CT 5W/FT 120V Buy Now
388121 SRM/E 5-2CT 5W/FT 240V Buy Now
388156 SRM/E 8-1CT 8W/FT 120V Buy Now
388180 SRM/E 8-2CT 8W/FT 240V Buy Now
388210 SRM/E 10-1CT 10W/FT 120V Buy Now
388244 SRM/E 10-2CT 10W/FT 240V Buy Now
388279 SRM/E 15-1CT 15W/FT 120V Buy Now
388316 SRM/E 15-2CT 15W/FT 240V Buy Now
388340 SRM/E 20-1CT 20W/FT 120V Buy Now
388375 SRM/E 20-2CT 20W/FT 240V Buy Now
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