SUPCO
SUPCO SHL509 Thermostat 210-240°F 2-51/64in SPST
A plenum thermostat with a 210 to 240°F range, 3 1/8-inch insertion length, and SPST switching
- SPST switch provides reliable on/off control
- 210 to 240 °F range suits high-limit safety
- 2-51/64 in depth fits standard plenums
- 30 °F differential prevents short-cycling
- Rated 1.5 A to 15 A for varied loads
HVAC Plenum Thermostat 210-240°F
The SUPCO SHL509 is a single-pole single-throw plenum thermostat designed for HVAC control applications. It opens on temperature rise within a 210 to 240 degrees Fahrenheit range. The 3 1/8 inch element insertion length suits standard plenum mounting.
Sustained Load Switching Behaviour
The differential is 30 degrees Fahrenheit between cut-out and cut-in, preventing rapid cycling during continuous operation. It carries three separate current ratings: 15 A, 10 A and 3 A at the upper end, plus 1.5 A at the lower end. This spread covers sustained inductive and resistive loads without nuisance trips.
Compact Body and Terminal Layout
Overall depth measures 2 51/64 inches with a width of 1 7/8 inches, allowing installation in tight plenums. SPST action means two terminals complete the circuit cleanly for straightforward wiring. No extra poles or auxiliary contacts are present, keeping daily service simple.
Highlights
- SPST switch provides reliable on/off control
- 210 to 240 °F range suits high-limit safety
- 2-51/64 in depth fits standard plenums
- 30 °F differential prevents short-cycling
- Rated 1.5 A to 15 A for varied loads
Specifications
| Brand | SUPCO |
|---|
Questions about this item
Does the 3 A / 1.5 A / 15 A / 10 A rating on the SHL509 mean it runs hot when the furnace cycles all day?
The control is rated for 15 A at the lower voltage and 10 A at the higher voltage; normal plenum mounting keeps temperature rise within design limits during continuous cycling.
What wiring or mounting hardware must I already have to install this 2-51/64 in. deep plenum thermostat?
You need a plenum opening that accepts a 3 1/8 in. insertion length, 1 7/8 in. width and 2 51/64 in. depth, plus supply wires sized for the 15 A / 10 A SPST contacts.
Will the 30 °F differential on the SHL509 work with an older furnace that expects a tighter swing?
The 30 °F differential is fixed; it will widen the on/off swing compared with controls that have a smaller differential, so verify the original spec before replacing.
Also in this aisle
People compared these
Same shelf, same checkout — eight coins and a 30-minute rate lock.
