Description
Lennox 46K73 AUTO Limit Switch — 200–230°F
The Lennox 46K73 is an OEM auto-reset limit switch engineered to protect furnaces and heating systems from dangerous overtemperature conditions. With a temperature range of 200–230°F, this limit switch monitors heat exchanger temperatures and automatically interrupts the burner circuit when temperatures exceed the rated threshold — then resets automatically once safe operating temperatures are restored.
Key Features
- Auto-reset (AUTO) operation — automatically resets once temperature drops to safe level
- Operating temperature range: 200–230°F
- Genuine Lennox OEM replacement part (SKU: 46K73)
- Designed to protect heat exchangers and furnace components from overheating
- Direct drop-in replacement for compatible Lennox heating systems
- Reliable bi-metal sensing element for accurate temperature response
Application
The 46K73 limit switch is a direct OEM replacement for compatible Lennox furnaces and heating equipment. It is installed in the supply air plenum or on the heat exchanger to monitor operating temperatures and safeguard the system against high-limit conditions caused by restricted airflow, dirty filters, or other fault conditions.
Why Choose an OEM Lennox Limit Switch?
Using a genuine Lennox OEM part ensures proper fit, accurate calibration, and reliable performance. Aftermarket substitutes may not meet the precise temperature ratings required for safe furnace operation. The 46K73 is the correct factory-spec replacement to maintain system integrity and warranty compliance.
