or if you observe visible pitting/burning on the contact points

75" track mount pilot relay designed for seamless integration into building automation systems (BAS) and HVAC mechanical rooms

the internal snap-disc may have failed

and 247-2 feeders

Efficient Coil Specs: 208/240V AC coil with 3 VA nominal power consumption and 7

Lennox 42J04 Limit Switch or if you observe visibleThe Lennox 42J04 Limit Switch is a critical OEM replacement part designed for high limit thermal protection in residential and commercial HVAC systems. Engineered to maintain safe operating parameters, this 135 175F Auto Limit Switch features an automatic reset mechanism that interrupts the heating circuit if internal plenum temperatures exceed the 175F threshold, preventing heat exchanger damage and ensuring system safety. This fixed temperature