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Nelson™ Heat Trace TF4X40 Thermostat
Nelson™ Heat Trace™ TF4X40 Thermostat
Nelson™ Heat Trace TF4X40 thermostat is used for controlling heat tracing systems in ordinary locations.
This thermostat is housed in a polyester enclosure. The switch has 22 Amp/480 Volt single pole single throw (SPST) leads.
Nelson™ Heat Trace TF4X40 Thermostat


Certifications and Compliances
UL Listed, CSA Certified: Ordinary (Unclassified) Locations
NEMA Type 4X; IP66
Molded fiberglass polyester
Fixed Temperature Range
+4.4 °C (40 °F)
-34 °C to +60 °C (-30 °F to +140 °F)
Capillary Length
0.9 m (3 ft)
Capillary Material
Tin Plated Copper
Maximum Bulb Temperature
+71 °C (+160 °F)
Electrical Data
22 Amp Resistance @ 480 Vac (100-480Vac)
Switch Type
Single Pole Single Throw (SPST)


  • Thermostat is designed for use with Nelson™ LT, HLT, XLT, CLT and NC Series heater cables
  • Economical pipe sensing temperature control
  • Fixed adjustment
  • NEMA 4X, IP66 corrosion resistant, watertight, non-metallic enclosure
  • The capillary bulb should be mounted on the side of the pipe