Durable Construction: The polycarbonate lens and bezel resist breakage and chemical cleaning agents

This genuine OEM furnace high limit switch is engineered to maintain system integrity by monitoring internal plenum temperatures

as long as the system utilizes standard 1/4" O

making it suitable for high-pressure R-410A systems

the 621679R utilizes standard 1/4" quick-connect spade lugs for direct integration into existing control boards

Lennox 71J07 Limit Switch Durable Construction: The polycarbonate lensThe Lennox 71J07 Limit Switch is a high precision, normally closed safety component designed for critical temperature regulation in heating systems. Engineered by Therm O Disc (Model 36TX11, 36T series), this disc style limit switch features an automatic reset function that ensures seamless system recovery once temperatures stabilize. With an open temperature threshold of 175F and a close temperature of 155F, this L175 20 limit switch effectively