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Small round metal thermostat with threaded probe and mounting flange

SUPCO

SUPCO SHL525 plenum thermostat 160 to 180 °F SPST

SKU CH-3PX0-KEBF0

Plenum thermostat opens at 180 °F and closes at 160 °F for automatic limit control in HVAC systems

  • Automatic reset restores operation without manual intervention
  • SPST contact opens on temperature rise for safety
  • 15 A resistive rating handles 120 V or 240 V circuits
  • 160–180 °F range suits plenum limit control
  • 7 in insertion depth fits standard ductwork

SUPCO SHL525 plenum thermostat overview

The SUPCO SHL525 is a plenum thermostat designed for HVAC limit control in residential and light commercial heating systems. It operates on a 160 to 180 degrees Fahrenheit range with SPST contacts that open on temperature rise. The unit features an automatic reset function for continuous cycling without manual intervention. It suits installers needing a direct replacement for failed limit switches.

120V and 240V AC voltage limits

This control accepts input voltages of 120V AC and 240V AC with a resistive rating of 15 amps at 120V AC. The switch action opens at 180 degrees Fahrenheit and closes at 160 degrees Fahrenheit, defining a fixed 20-degree differential. Wiring must respect the SPST contact form and the stated ampacity to avoid contact welding. No other voltage or current ratings are specified for this model.

Replaces fixed-limit plenum controls

The SHL525 replaces older fixed-temperature limit switches that lack automatic reset or offer a narrower temperature window. The upgrade is worth it when the original control has drifted out of calibration or when the system demands the 160 to 180 degree range for proper burner cycling. It does not suit applications requiring adjustable differential or manual reset functionality.

Highlights

  • Automatic reset restores operation without manual intervention
  • SPST contact opens on temperature rise for safety
  • 15 A resistive rating handles 120 V or 240 V circuits
  • 160–180 °F range suits plenum limit control
  • 7 in insertion depth fits standard ductwork

Specifications

BrandSUPCO

Questions about this item

Should I pick the 160 °F or 180 °F setting for my RV furnace?

This thermostat opens at 180 °F and closes again at 160 °F, so the furnace cycles between those two points automatically.

What does the 15 A rating mean when the unit is running on 120 V AC?

It can switch a resistive load of up to 15 A at 120 V AC without exceeding its contact limits.

How does the SPST contact form affect wiring in a 240 V AC system?

The single-pole single-throw switch breaks one leg of the circuit; the other leg remains unswitched.

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