Medium Temperature Self Regulating Heat Tracing Cable

Marathon Heaters self regulating heating cable provide the most versatility in heat trace design and applications. Constructed of a Semi-conductive heater matrix extruded between parallel buswires, a self regulating cable adjusts its output to independently respond to ambient temperatures all along its length. As temperatures increase,the heater’s resistance increase which lower the output wattage. Conversely, as the temperature decrease, the resistance decreases and the cable produces more heat. So it is no need thermostat in some applications. It will never overheat or burnout even when wrapped by itself(overlapped). It can be cut
to any length. So it is a convenient ,easy use and energy saving product.


1. Bus wires
2. Semi-conductive self regulating matrix
3. Inner Jacket
4. Copper /Nickle plated copper
5. Outer Jacket

Construction Data

Buswire size 1.3mm tinned copper
Heating elements PTC
Insulation Polyolefin or Fluoropolymer


Graph of MTSRH


Max length(m)vs circuit breaker size

AC220V Max circuit length(m) vs CB size
Model Start-up temp.°C 25A 32A 40A
MTSRH 10 53 69 86
0 46 61 74
-20 41 53 66
-40 36 48 60

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Cable Specifications

Output wattage at 10°C 40, 45, 50, 60 W/M
Braiding covering area Over 85%
Max. maintain temp @ 10°C 105°C
Max. exposure temp. 135°C
Min.installation temp. -40°C
Bending radius 10 times*cable thickness
Voltage 208-277 V
Insulation color Gray
Regular size to insulation 11.8*3.4mm-polyolefin insulation
11.6*3.2 Fluoropolymer insulation