Q-Mark
Q-Mark SPST Thermostat 240/208V AC UH724ST
SPST thermostat for 240/208 V AC electric space heaters, wall-mounted with Fahrenheit scale and cULus listing
- TypeLearning Thermostats
- SPST switching for simple on/off control of electric space heaters
- 240/208V AC rating matches common commercial heater circuits
- Wall-mount design allows convenient placement in workspace or garage
- cULus listed for compliance with North American safety standards
- Compatible with Grainger part numbers 3UG73 and 3UG74 for easy replacement
Single-pole thermostat for electric heaters
The Q-Mark SPST thermostat controls 240/208V AC electric space heaters. It mounts on a wall and displays temperature in Fahrenheit. The unit carries a cULus listing for safety compliance. It replaces Grainger part numbers 3UG73 and 3UG74.
Installers wiring single-pole heater circuits
This thermostat suits contractors and facility staff who need a basic line-voltage switch for one heater circuit. It will not serve systems that require double-pole switching, multi-stage control, or smart-home integration. Buyers needing programmable schedules or remote access should look at a different model.
Simple two-wire line-voltage installation
Power must be off before connecting the two line wires to the SPST terminals. A common error is wiring the device on a circuit that exceeds the 240/208V AC rating or using it on a low-voltage system. Verify the heater voltage matches the thermostat rating before closing the wall plate.
Highlights
- SPST switching for simple on/off control of electric space heaters
- 240/208V AC rating matches common commercial heater circuits
- Wall-mount design allows convenient placement in workspace or garage
- cULus listed for compliance with North American safety standards
- Compatible with Grainger part numbers 3UG73 and 3UG74 for easy replacement
Specifications
| Brand | QMARK |
|---|---|
| Type | Learning Thermostats |
Questions about this item
Does this thermostat control a 240 V or 208 V electric space heater?
It is rated for both 240 V and 208 V AC electric space heaters.
Will the SPST switching work with my existing two‑wire heater circuit?
Yes, the single‑pole single‑throw action opens or closes the two‑wire line to the heater.
How can I confirm the unit is operating correctly after wall mounting?
Set the Fahrenheit dial above room temperature and verify the heater activates, then lower it to confirm shut‑off.
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