The Lennox PS80-01-0819 High Pressure Switch (also listed as 38M77) is a genuine OEM safety component designed for use in Lennox HVAC systems operating with R410A refrigerant. It features a high-pressure cut-off at 640 PSI and reset at 475 PSI, protecting the compressor and system components from excessive pressure buildup. This switch ensures safe and efficient operation, particularly in demanding cooling environments. Key Features OEM high-pressure safety switch Designed for systems using R410A refrigerant Cut-out pressure: 640 PSI Reset pressure: 475 PSI Helps prevent compressor and system damage from high pressure Built for durable performance in HVAC applications Specifications Part Numbers: PS80-01-0819, 38M77 Refrigerant: R410A Cut-Out Pressure: 640 PSI Reset Pressure: 475 PSI Type: High pressure switch Application: HVAC compressor protection Brand: Lennox Compatible Models KHB074S4-01 KHA072S4-02 LGC120S4-01 And over 100 additional Lennox units Why Choose This Item The Lennox PS80-01-0819 Pressure Switch is vital for maintaining safe operating conditions in your HVAC system. As a genuine OEM part, it offers precise performance, system compatibility, and reliable protection, ensuring your equipment runs efficiently and is safeguarded against pressure-related failures.