Chromalox SRM/E Self-Regulating Trace Heating Cable (Medium Temperature – 302°F 150°C)

Chromalox SRM/E Trace Heating Cable


Frost Protection Trace Heating Cables

Trace Heating

Chromalox SRM/E self-regulating trace heating cables provide process temperature maintenance and frost protection to pipework, instrument lines, tanks and drums up to 150º Celsius. They are Factory Mutual (FM) Approved, UL Listed, and CSA certified for ordinary areas. ATEX, IECEx, FM, and CSA Approved for hazardous areas when.

Trace Heating Cable Features

  • Chromalox SRM/E trace heating cables are energy efficient as they use less energy when less heat is required
  • The simple to install heating cable can be cut to any length while in the field (see max circuit length)
  • SRM/E trace heating cables offer low installation costs and require less maintenance minimising downtime
  • Heating cables can be single overlapped without burnout, which simplifies heat tracing of in-line process equipment such as valves, elbows and pumps
  • The risk of overtemperature is minimised with self regulating trace heating cables
  • Chromalox cable termination, splice, tee and end seal kits further reduce installation time
Trace Heating Cable

Trace Heating Cable | Frost Protection for Pipes


Chromalox SRM/E heat trace cable wattages per metre at 10°C – 5, 8, 10, 15 and 20 watts. This range of self-regulating trace heating cables increase power output as temperatures fall, to provide guaranteed frost protection and temperature maintenance of industrial process and water pipework.

  • Approximate Heating Cable Size : 3/8″ W x 1/8″ H
  • Maximum Maintain Temperature : 150° Celsius
  • Maximum Continuous Exposure Temperature : Power Off 215° Celsius
  • Available Models (Voltages) : 120 and 208 – 277V
  • Minimum Heating Cable Bend Radius : 1-1/8″
  • Trace Heating Cable Circuit Lengths : Up to 750 feet

Chromalox Cable Part Number  Trace Heating Cable Description W/Ft Voltage
385490 Chromalox SRM/E-3-2C

385561 Chromalox SRM/E 3-1CT 120V
385570 Chromalox SRM/E 3-2CT 240V
388025 Chromalox SRM/E-3-1C 120V
388084 Chromalox SRM/E-5-1C

388092 Chromalox SRM/E 5-1CT 120V
388113 Chromalox SRM/E-5-2C 240V
388121 Chromalox SRM/E 5-2CT 240V
388148 Chromalox SRM/E-8-1C

388156 Chromalox SRM/E 8-1CT 120V
388172 Chromalox SRM/E-8-2C 240V
388180 Chromalox SRM/E 8-2CT 240V
388201 Chromalox SRM/E-10-1C

388210 Chromalox SRM/E 10-1CT 120V
388236 Chromalox SRM/E-10-2C 240V
388244 Chromalox SRM/E 10-2CT 240V
388260 Chromalox SRM/E-15-1C

388279 Chromalox SRM/E 15-1CT 120V
388308 Chromalox SRM/E-15-2C 240V
388316 Chromalox SRM/E 15-2CT 240V
388332 Chromalox SRM/E 20-1C

388340 Chromalox SRM/E 20-1CT 120V
388367 Chromalox SRM/E-20-2C 240V
388375 Chromalox SRM/E 20-2CT 240V

Chromalox SRME Self-Regulating Trace Heating Cable Thermal Output Ratings on Insulated Metal Pipe

Output Wattage at Alternate Voltages (W/Ft.)

Chromalox Part Number 208V % Change In Output 220V % Change In Output 277V % Change In Output
Chromalox SRM/E 5 3.85 -23 4.25 -15 6.45 +23
Chromalox SRM/E 8 6.4 -20 6.88 -14 10.24 +22
Chromalox SRM/E 10 8.3 -17 8.80 -12 12.50 +20
Chromalox SRM/E 15 12.75 -15 13.50 -10 18.45 +19
Chromalox SRM/E 20 17.6 -12 18.40 -8 24.40 +19

Chromalox Frost Protection Cable



Chromalox SRP Self-Regulating Trace Heating Cable - Construction

  • A Twin 16 AWG Copper Buss Wires are able to provide reliable electrical current capability.
  • B Semiconductive Polymer Core Matrix is the self regulating component of the cable and it’s electrical resistance varies with temperature.
  • C Fluoropolymer Jacket is flame retardant and electrically insulates the matrix and buss wires and provides corrosion resistance.
  • D Tinned Copper Braid that provides additional mechanical protection in any environment, and a positive ground path.
  • E High Temperature Fluoropolymer Overjacket (optional) is a corrosion resistant, flame retardant overjacket is highly effective in many environments.


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.

Hazardous Area Heating Cables

Hazardous Area Heating Cables

CSA and FM Approved
  • Class I, Div. 1* & 2 Groups A*, B, C, D (gases, vapours)
  • Class II, Div. 1*& 2 Groups E*, F, G (combustible dust)
  • Class III, Div. 2 (easily ignitable fibres and fillings)
  • 5 and 8 Watt Rated T3 Temperature Class
  • 10, 15, and 20 Watt Rated T2D Temperature Class

CSA Only

  • -CT overjacket only

ATEX Approved

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

IECEx Approved

  • ITS 07.0018X Ex e IIC T3 Gb Ta -60˚C to 195˚C

Note: Cable Surface Temperature shall not exceed 190°C in Class II, Div. 2, Group F; 165°C in Class II, Div. 2 Group G.

➡ 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