Description
The Copeland Comfort Control 3L09-3 is a snap disc limit switch designed for temperature-actuated circuit control in gas furnaces, electric heating equipment, and related HVAC systems where reliable high-limit or operational switching is required. Snap disc limit switches use a bimetal disc element that snaps between open and closed positions at a factory-set temperature threshold, providing fast and repeatable switching response without the need for external power or electronic control signals. The 3L09-9 mounts directly to a heat exchanger surface, duct wall, or equipment panel, where it reads contact temperature to protect against overtemperature conditions or to sequence equipment operation based on sensed thermal state. This style of limit switch is a fundamental safety and control component across a wide range of residential and light commercial furnace and air handler platforms, and correct replacement with a properly rated snap disc is essential for maintaining equipment protection and control sequencing integrity. The 3L09-9 is an OEM-quality Copeland Comfort Control component suited for direct replacement during field service on heating systems that specify this snap disc configuration.
Key Features
- Snap disc bimetal element delivers fast, repeatable temperature-actuated switching without external power
- Direct surface-mount installation on heat exchangers, duct walls, or equipment panels
- Functions as high-limit protection or operational sequencing control depending on application
- Factory-set temperature threshold ensures consistent switching performance across service life
- Compatible with gas furnace, electric heating, and air handler applications requiring snap disc limit control
- OEM-quality Copeland Comfort Control replacement for field service and maintenance applications
- No external power or electronic signal required for switching actuation
- Essential safety and sequencing component for residential and light commercial HVAC heating systems
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