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Small rectangular thermostat with metal probe and two wire terminals

SUPCO

SUPCO Plenum Thermostat Limit Control 190-170F

SKU CH-8NSQ-R3X6S

A plenum thermostat that opens at 190°F and resets at 170°F for automatic limit control in HVAC systems

  • typeFixed Temp, Auto Reset Plenum Mount
  • Automatic reset restores operation after cooling
  • Opens at 190°F to protect against overheating
  • Closes at 170°F for safe restart
  • Handles 15A resistive at 120V AC
  • SPST switch action opens on temperature rise

Plenum Thermostat Limit Control 190-170F

This SUPCO limit control is a fixed-temperature plenum thermostat designed for HVAC safety applications. It mounts directly into the plenum and uses an automatic reset function to manage high-limit conditions. The SPST contact opens on temperature rise to interrupt the circuit. It suits technicians and installers needing reliable overheat protection for heating equipment.

Switch Range 190-170F 15A 120V

The switch opens at 190°F and automatically closes again at 170°F, providing a 20-degree differential. It handles 15 amps resistive at 120V AC and 10 amps resistive at 240V AC. Inductive loads are rated at 3 amps and 1.5 amps respectively. The insertion element extends 3 1/8 inches into the airstream for accurate sensing.

Automatic Reset Plenum Mount

The automatic reset restores the circuit once the plenum temperature falls to the closing point, avoiding manual intervention. The fixed temperature settings are not adjustable, so the control cannot be calibrated for different trip points. The 120V and 240V AC ratings cover common residential and light commercial supply voltages. Installers must verify the insertion length fits the specific plenum depth.

Highlights

  • Automatic reset restores operation after cooling
  • Opens at 190°F to protect against overheating
  • Closes at 170°F for safe restart
  • Handles 15A resistive at 120V AC
  • SPST switch action opens on temperature rise

Specifications

BrandSupco
typeFixed Temp, Auto Reset Plenum Mount

Questions about this item

Will the SUPCO plenum thermostat work with my existing 120 V AC furnace control circuit?

Yes, it is rated for 120 V AC with 15 A resistive and 3 A inductive loads, so it can switch standard furnace control circuits.

How can I verify the limit control is opening and closing at the correct temperatures after installation?

The contacts open on temperature rise at 190 °F and automatically reset when the temperature falls to 170 °F; you can confirm operation by monitoring the circuit through that range.

What comes in the box and do I need any extra mounting hardware or wiring connectors?

The thermostat itself is supplied; mounting hardware and wire connectors are not included and must be sourced separately.

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