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Nelson™ Heat Trace TA4X140 Thermostat
Nelson™ Heat Trace™ TA4X140 Thermostat
Nelson™ Heat Trace TA4X140 is used for ambient temperature control in ordinary or corrosive locations.
This thermostat is housed in an aluminum enclosure. The switch has 22 Amp/250 Volt single pole double throw (SPDT) leads.
Nelson™ Heat Trace TA4X140 Thermostat


Certifications and Compliances
UL Listed, CSA Certified: Ordinary (Unclassified) Locations
NEMA Type 4X; IP66
Die cast aluminum
Temperature Range
-9 °C to +60 °C (+15 °F to +140 °F)
-40 °C to +71 °C (-40 °F to +160 °F)
Capillary Material
316L Stainless Steel
Maximum Bulb Temperature
+71 °C (+160 °F)
Electrical Data
22 Amp Resistance @ 480 Vac (100-480Vac)
Switch Type
Single Pole Double Throw (SPDT)


  • Thermostat is designed for use with Nelson™ LT, HLT, XLT and NC Series heater cables
  • Used to turn heat trace system/cables on when ambient temperature goes below freezing
  • Can be used in ordinary and corrosive environments
  • Internal adjustment
  • NEMA 4X, IP66 epoxy coated metal enclosure