Lennox 29M74 Limit Switch 328140-751 where consistent temperatures are vital

where consistent temperatures are vital for product safety

using the Carrier SF703026 maintains the factory seal and electrical impedance required for modern high-efficiency systems

Its stainless steel sensing element is built to handle the mechanical stresses of high-side discharge environments

and York gas-fired systems

preventing nuisance tripping while providing reliable high-limit protection

Lennox 29M74 Limit Switch 328140-751 where consistent temperatures are vitalThe Lennox 29M74 Limit Switch is a critical fixed temperature safety component engineered for Lennox furnace flame rollout and primary limit protection. This SPST (Single Pole Single Throw) thermal switch is rated for a 140F trip point with a 30F differential, ensuring precise furnace cycling and preventing heat exchanger damage. Designed as a direct OEM replacement limit switch, the 29M74 features a 1 inch insertion depth and 1 4 inch quick connect