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

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Frost Protection Trace Heating Cables

Chromalox SRL Self Regulating Cable

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).

Trace Heating Cable Features

  • Energy efficient SRL self regulating cables requires less energy as less heat is required
  • Simple to install trace heating 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
  • Heating cables 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. These 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.

  • Approximate Heating 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 Heating Cable Bend Radius : 1-1/8″
  • Trace Heating Cable Circuit Lengths : Up to 660 feet


Cable Part Number  Chromalox Trace Heating Cable Order Code W/Ft Voltage
 382678 SRL 3-1C 3 120V
382686 SRL 3-2C 240V
 382731 SRL 3-1CR 120V
 382740 SRL 3-2CR 240V
 383400 SRL 3-1CT 120V
 383419 SRL 3-2CT 240V
 382694 SRL 5-1C 5 120V
 382707 SRL 5-2C 240V
 382758 SRL 5-1CR 120V
 382766 SRL 5-2CR 240V
 383443 SRL 5-1CT 120V
 383451 SRL 5-2CT 240V
 382555 SRL 8-1C 8 120V
 382563 SRL 8-2C 240V
 382598 SRL 8-1CR 120V
382600 SRL 8-2CR 240V
 382460 SRL 8-1CT 120V
 383478 SRL 8-2CT 240V
 382820 SRL 10-1C 10 120V
382838 SRL 10-2C 240V
 382846 SRL 10-1CR 120V
 382854 SRL 10-2CR 240V
 383486 SRL 10-1CT 120V
 383494 SRL 10-2CT 240V


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 Number 208V % Change In Output 220V % Change In Output 277V % Change In Output
Chromalox SRL 3 2.4 -20 2.6 -13 3.4 +15
Chromalox SRL 5 4.1 -18 4.5 -10 5.6 +13
Chromalox SRL 8 6.88 -14 7.28 -9 8.96 +12
Chromalox SRL 10 8.7 -13 9.2 -8 11.1 +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 cables and product offering including self regulating trace heating cable.


Industrial Electrical Heating Specialists

We can specify and supply from stock an extensive range of Electrical Heating Equipment for industrial and process heating applications -this includes temperature maintenance and frost protection (Winterisation) products for pipework, valves, IBC’s, drums, hoses, tanks and vessels. We produce custom silicone heaters for rapid and high temperature heat-up of complex shapes and surfaces – from concept, design to the delivery of standard or bespoke heaters on the shortest lead times. From the largest UK heat tracing cable stocks we deliver Electric Trace Heating Systems for pipework frost protection, ramp heating, roof/gutter snow melting and de-icing – enquire about our in-house design service.

Data Sheets