Description
Lennox 49K61 Auto Reset Limit Switch Overview
The Lennox 49K61 is an OEM replacement limit switch designed to protect furnaces and heating systems from dangerous overheating conditions. Rated at 300°F cutout (CO) with automatic (AUTO) reset functionality, this limit switch monitors heat exchanger temperatures and interrupts the burner circuit when temperatures exceed the safe operating threshold — then automatically resets once temperatures return to a safe level.
Key Features
- 300°F cutout (CO) temperature rating for reliable high-temperature protection
- Automatic (AUTO) reset — restores normal operation once temperature drops to safe levels
- OEM Lennox replacement part — engineered for precise fit and performance
- Protects heat exchanger and furnace components from thermal damage
- Interrupts burner operation upon detecting unsafe temperature conditions
- Direct replacement for compatible Lennox heating systems
Product Specifications
- Brand: Lennox
- Part Number / SKU: 49K61
- Cutout Temperature: 300°F
- Reset Type: Automatic (AUTO)
- Function: Cutout (CO) Limit Switch
Application
The Lennox 49K61 limit switch is a critical safety component used in Lennox furnaces and heating equipment. It is designed to sense air temperature within the furnace plenum or heat exchanger area and shut down the burner if temperatures reach the 300°F threshold, preventing equipment damage, heat exchanger failure, and potential fire hazards. The automatic reset feature allows the system to resume normal operation without manual intervention once safe temperatures are restored.
