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Small rectangular thermostat with metal probe and mounting tabs

SUPCO

SUPCO Limit Control Auto Reset Plenum Mount 140-110F

SKU CH-XZCK-65PMG

Auto-reset plenum limit control opens on temperature rise at 140 °F and resets at 110 °F

  • typeFixed Temp, Auto Reset Plenum Mount
  • Auto-reset limit control protects equipment from overheating
  • Fixed temperature range 140-110°F suits HVAC plenum applications
  • SPST switch opens on temperature rise for safety shutdown
  • Mounts directly in plenum with 3 1/8 in insertion length
  • Rated for 120, 240 and 480 volt systems

Product identity

The SUPCO Limit Control is a fixed-temperature, auto-reset plenum-mount switch designed for HVAC systems that require automatic safety cut-out and restart. It serves installers and maintenance technicians who need a reliable high-limit device with a defined temperature range.

Thermals noise and power

The control operates on a 30 °F differential, opening on rise at 140 °F and closing again at 110 °F. As a passive electromechanical switch it draws no operating current of its own and produces no audible noise during normal cycling.

Sustained load behaviour

Rated for 15 A at 120 V, 10 A at 240 V and 3 A at 480 V, the SPST contacts maintain their calibration through repeated automatic reset cycles. The fixed set-points and 3 1/8 in insertion length ensure consistent response when the plenum temperature remains elevated for extended periods.

Highlights

  • Auto-reset limit control protects equipment from overheating
  • Fixed temperature range 140-110°F suits HVAC plenum applications
  • SPST switch opens on temperature rise for safety shutdown
  • Mounts directly in plenum with 3 1/8 in insertion length
  • Rated for 120, 240 and 480 volt systems

Specifications

BrandSupco
typeFixed Temp, Auto Reset Plenum Mount

Questions about this item

How do I install the 3 1/8 inch insertion probe into the plenum, and what step do people often miss?

Mount the control so the probe extends 3 1/8 inches into the airstream, then wire the SPST contacts in series with the fan circuit; the step often missed is confirming the switch opens on temperature rise rather than fall.

What maintenance or replacement will this limit control need after extended service?

The auto-reset mechanism cycles repeatedly between 110 and 140 degrees Fahrenheit with a 30-degree differential; if the contacts eventually weld or drift out of calibration, the entire control must be replaced.

At what temperature does the safety limit trip first during sustained overheating?

The switch opens on rise at 140 degrees Fahrenheit, cutting power to the fan circuit; it will not re-close until the plenum cools to 110 degrees Fahrenheit.

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