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Nelson Heat Trace TA Series Thermostats, TA Series thermostats automatically switch on the heating cable system when the ambient temperature reaches the freezing point.

TA4X140 thermostats are suitable for use in ordinary and corrosive locations
• Features a corrosion-resistant, epoxy-coated metal enclosure and a 480V/22A single-pole, double-throw switch with terminal connections
• Maintains the temperature within a selectable range from -9°C/15°F to 60°C/140°F
• The internal temperature adjustment has a calibration accuracy of 1.1°C/2°F
• The thermostat is UL Listed, CSA Certified and CE Marked for use in ordinary locations

TA7140 thermostats are suitable for use in hazardous locations
• Incorporates all the features of the TA4X140 in a NEMA 4,7,9 cast aluminum enclosure with threaded flange construction
• UL Listed, FM Approved, CSA Certified and ATEX Certified for use in hazardous locations















TA4X140 Thermostat Specification Sheet
TA7140 Thermostat Specification Sheet
Thermostat Selection Guide
Thermostat Options List
Item IDDescriptionQuantity
TA4X140
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
Maximum Bulb Temp: 160° F (71° C)
Switch: 22A/480V SPDT Terminals
Capillary Material: Stainle
TA7140
Used to turn heaters off/on based on ambient air temperatures in classified (hazardous) areas.
External adjustment
NEMA 4,7,9 cast aluminum enclosure
Threaded flange construction
Maximum Bulb Temp: 160°F (71°C)
Switch: 22A/480V SPDT Terminals
Capillary Material: Stainless Steel