Chromalox SRL | Self-Regulating Trace Heating Cable (Low Temperature – 150°F 65°C)

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Chromalox SRL Self Regulating CableChromalox

Trace Heating cable

chromalox srl

Chromalox SRL self-regulating, low temperature trace heating cables provide frost protection to pipework, instrument lines, valves, tanks and heating drums.

SRL trace heating cable has a maximum maintenance temperature rating of 150°F (65°C). Constructed of industrial grade 16 AWG buss wire with a tinned copper braid and overjacketing, SRL ensures safe operation within CSA & FM Division 2 and ATEX Zone 1 (Gas).


  • Energy efficient SRL self regulating cables requires less energy as less heat is required
  • Simple to install cable and can be cut to any length (see max circuit length)
  • SRL trace heating cables offer low installation costs and require less maintenance, minimising downtime
  • Field splices can be performed easily in minutes with no scrap or wasted cold sections
  • Can be single overlapped without burnout, which simplifies heat tracing of in-line process equipment such as valves, elbows and pumps
  • Over-temperature is conditions are kept to a minimum with self regulating trace heating cables
  • UL listed for use in ordinary areas


Chromalox SRL heat trace cable is available in 3, 5, 8 and 10 w/ft.

  • Approximate Cable Size : 0.47″ W x 0.20″ H
  • Maximum Maintain Temperature : 65° Celsius
  • Maximum Continuous Exposure Temperature : Power Off 85° Celsius
  • Available Models (Voltages) : 120V and 208V – 277V
  • Minimum Cable Bend Radius : 1-1/8″
  • Trace Heating Cable Circuit Lengths : Up to 660 feet

Chromalox SRL self-regulating, low temperature trace heating cables increase power output as temperatures falls to provide guaranteed frost protection and temperature maintenance to industrial process and water pipework.

Cable Part Number Chromalox Trace Heating Cable Order CodeW/FtVoltage
 382678SRL 3-1C3120V
382686SRL 3-2C240V
 382731SRL 3-1CR120V
 382740SRL 3-2CR240V
 383400SRL 3-1CT120V
 383419SRL 3-2CT240V
 382694SRL 5-1C5120V
 382707SRL 5-2C240V
 382758SRL 5-1CR120V
 382766SRL 5-2CR240V
 383443SRL 5-1CT120V
 383451SRL 5-2CT240V
 382555SRL 8-1C8120V
 382563SRL 8-2C240V
 382598SRL 8-1CR120V
382600SRL 8-2CR240V
 382460SRL 8-1CT120V
 383478SRL 8-2CT240V
 382820SRL 10-1C10120V
382838SRL 10-2C240V
 382846SRL 10-1CR120V
 382854SRL 10-2CR240V
 383486SRL 10-1CT120V
 383494SRL 10-2CT240V


Chromalox SRL Thermal Output Ratings On Insulated Metal Pipe

Trace Heating

Chromalox SRL Thermal Output Ratings On Plastic Pipe With Aluminum Tape

Chromalox SRL

Output Wattage at Alternate Voltages (W/Ft.)

Chromalox Part Number208V% Change In Output220V% Change In Output277V% Change In Output
Chromalox SRL 32.4-202.6-133.4+15
Chromalox SRL 54.1-184.5-105.6+13
Chromalox SRL 86.88-147.28-98.96+12
Chromalox SRL 108.7-139.2-811.1+10


Chromalox SRL Self-Regulating Trace Heating Cable - Construction

  • Twin 16 AWG Copper Buss Wires are able to provide reliable electrical current capability.
  • Semiconductive Polymer Core Matrix is the self regulating component of the cable and it’s electrical resistance varies with temperature.
  • Water Resistant Polyolefin Jacket is flame retardant and electrically insulates the matric and buss wires and provides resistance to water and some inorganic chemical solutions.
  • Tinned Copper Braid that provides additional mechanical protection in any environment, and a positive ground path.
  • High Temperature Fluoropolymer or TPR Overjacket (Optional) is a corrosion resistant, flame retardant overjacket is highly effective in many environments. TPR coatings protect against certain inorganic chemical solutions.


FM Approvals

  • FM – Factory Mutual approved for ordinary areas. UL Listed, CSA Certified for ordinary areas. UL Listed for fire protection system piping
  • FM approved for hazardous (classified) areas when used with Chromalox accessories: Class I, Div. 2, Groups B, C, D (gases, vapors)  Class II, Div. 2, Groups F, G (combustible dust)  Class III, Div. 2 (easily ignitable fibers and filings) 3 Watt rated T6 temperature class  5 and 8 Watt rated T5 temperature class 10 Watt rated T4A temperature class


Certified for hazardous (classified) areas when used with Chromalox accessories:

  • Class I, Div. 2, Groups A, B, C, D;
  • Class II, Div. 2, Groups F, G

ATEX Directive

ATEX CE 0359 IIG Ex e IIC T* Gb Ta -60˚C to 195˚C

Hazardous Area Heating Cables

Heating Cables


ITS 07.0018X Ex e IIC T5 Gb Ta -60˚C to 95˚C

➡ Chris Myers, Product Manager at Chromalox, explains about their heat trace product offering including self regulating trace heating cable.


Experts in Equipment for Explosive Atmospheres

Learn more about our ATEX & IECEx Product Innovations and how we deliver significant improvements to clients plant, people and operational safety in the explosive atmosphere industries – we service UK and international projects with a comprehensive range of certified Electrical, HVAC and Process Instrumentation equipment for the hazardous area industries.

Experts in Equipment for Explosive Atmospheres


Thorne & Derrick International distribute Electrical, Mechanical, Process & Instrumentation Equipment to the global hazardous area industries and are approved vendors to most leading oil, gas and petrochemical companies and their EPC’s.

T&D supply ATEX & IECEx Certified equipment for the detection, metering, flow measurement and heat tracing of potentially explosive gases in hazardous areas Zone 1 and Zone 2 (Explosive Gas) and Zone 21 and Zone 22 (Explosive Dust).