Description
The Copeland 3L09-10 is a board mount snap disc limit control designed to open on a temperature rise, providing automatic high-limit protection and temperature-actuated circuit interruption in gas furnaces, electric heating equipment, and related HVAC systems. Unlike surface-mount or duct-mount snap disc controls, the board mount configuration allows the 3L09-10 to be mounted directly to a control board or component bracket within the equipment enclosure, positioning the disc element for accurate sensing of localized temperature conditions near heat-sensitive components or control circuitry. The open-on-rise action interrupts the circuit when the sensed temperature reaches the factory-set threshold, protecting downstream equipment and wiring from overtemperature damage and providing a safety shutoff function consistent with standard furnace high-limit control applications. Snap disc switching requires no external power for actuation, relying entirely on the bimetal disc element response to sensed heat. The 3L09-10 is an OEM-quality White-Rodgers replacement component suited for direct field substitution on heating systems and control assemblies that specify this board mount snap disc configuration.
Key Features
- Board mount configuration allows direct installation to control boards or component brackets within equipment enclosures
- Opens on temperature rise to interrupt circuit at factory-set high-limit threshold
- Snap disc bimetal element provides fast, repeatable switching response without external power or control signals
- Suitable for high-limit protection and temperature-actuated safety shutoff in gas and electric heating equipment
- Localized sensing capability near heat-sensitive components or control circuitry within the equipment enclosure
- OEM-quality White-Rodgers replacement for field service on heating systems specifying board mount snap disc controls
- Single-pole switching configuration compatible with standard HVAC control circuit wiring
- No external power required for switching actuation — fully self-contained bimetal disc operation
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