The Lennox 69M1801 Hi-Pressure Cutout Switch (also listed as 29PSL012-400) is a genuine OEM high-pressure safety switch designed to protect HVAC systems by shutting down compressor operation when system pressure exceeds safe limits. Rated for 650 PSI, this pressure switch plays a vital role in preventing system damage due to over-pressurization in residential and light commercial units. Key Features High-pressure safety cutout switch for HVAC protection Trips at 650 PSI to prevent compressor or system damage Compatible with Lennox air handlers, furnaces, and AC units OEM-grade reliability and response accuracy Helps maintain safe system operating conditions Specifications Part Numbers: 69M1801, 29PSL012-400 Pressure Rating: 650 PSI trip point Function: High-pressure cutout safety switch Application: Refrigerant circuit protection Mounting: Standard fitting for Lennox systems Brand: Lennox Compatible Models EL072KCSST-01 EL090XCSST-01 EL180XCSDT-01 And many other Lennox Elite and Merit series air handlers and condensers Why Choose This Item The Lennox 69M1801 / 29PSL012-400 High-Pressure Switch is essential for maintaining system safety and longevity by preventing dangerous pressure levels. As a genuine OEM component, it ensures accurate performance, proper fit, and compliance with Lennox system specs?making it a dependable solution for HVAC professionals and homeowners looking to protect their investment.