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Small rectangular thermostat with metal body and two terminals

SUPCO

SUPCO Thermostat LD170 150-170°F 120-240V dryer accessory

SKU CH-NMDN-TCSR8

Automatic-reset limit thermostat opens at 170 °F and closes at 150 °F for 120-240 V dryer circuits

  • TypeDrain Hose
  • MaterialHAWA
  • Weight0.06
  • Automatic reset thermostat opens at 170°F and closes at 150°F for safe dryer cycling
  • Handles up to 25 A at 120 to 240 V for heavy-duty heating elements
  • SPDT switch action gives precise temperature control in automatic reset mode
  • 20°F differential prevents rapid on-off cycling and extends component life
  • Lightweight 0.06 lb insertion design fits standard dryer mounting brackets

Dryer limit thermostat 150-170 °F

This SUPCO LD170 thermostat serves as an automatic-reset safety limit for residential and light-commercial dryers. It opens on temperature rise using SPDT switch action and operates across a 120 to 240 volt range. Installers and maintenance technicians use it to replace failed OEM limit controls in compatible appliances.

Thermal cycling and electrical ratings

The device opens at 170 °F and closes again at 150 °F, providing a 20 °F differential for fan or heater cycling. Rated currents are 25 A, 14 A and 10 A with a 125 VA pilot-duty rating at the stated voltage range. The compact insertion body measures 1 inch high, 2 inches wide and 1-1/2 inches deep, weighing 0.06 lb.

HAWA drain-hose material and mounting

The housing uses HAWA material for durability in moist dryer environments. No wiring harness, brackets or configuration software are bundled; the thermostat installs directly into the existing insertion point. Buyers needing a different temperature range or a manual-reset design must select an alternative control.

Highlights

  • Automatic reset thermostat opens at 170°F and closes at 150°F for safe dryer cycling
  • Handles up to 25 A at 120 to 240 V for heavy-duty heating elements
  • SPDT switch action gives precise temperature control in automatic reset mode
  • 20°F differential prevents rapid on-off cycling and extends component life
  • Lightweight 0.06 lb insertion design fits standard dryer mounting brackets

Specifications

BrandSupco
TypeDrain Hose
MaterialHAWA
Weight0.06

Questions about this item

How do I install the LD170 thermostat and what step is often missed?

Mount the 1‑1/2 in. deep by 2 in. wide by 1 in. high body in the dryer's insertion opening, wire the SPDT terminals for 120‑240 V, then verify the 20 °F differential so the switch opens at 170 °F and resets at 150 °F — the differential check is the step most often skipped.

What maintenance or replacement will the LD170 thermostat need later?

The automatic‑reset limit switch is sealed and requires no routine service; replace the entire unit only if it fails to open at 170 °F or close at 150 °F after repeated cycles.

What limit appears first when the LD170 thermostat runs continuously?

The 25 A / 125 VA contact rating at 120‑240 V is the first ceiling; sustained loads above 14 A resistive or 10 A inductive will overheat the SPDT contacts before the 150‑170 °F temperature range is reached.

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