meaning it re-closes the circuit on its own once temperatures drop

Durable Construction: Forged from corrosion-resistant brass to withstand the rigors of commercial and industrial HVACR mechanical rooms

The Johnson Controls T-4002-5018 is a high-precision external set point dial engineered for integration with T-4000 Series pneumatic thermostats

For Series 64 or 67

Nordyne 626610 Rollout Switch meaning it re-closes the circuitThe Nordyne 626610 Rollout Switch is a critical safety component designed for precise thermal monitoring in high efficiency gas furnaces. Engineered with a 250 degree F fixed temperature setpoint, this Single Pole Single Throw (SPST) switch provides indispensable protection by breaking the electrical circuit if it detects flames or excessive heat escaping the combustion chamber. As a Manual Reset device, it ensures that a qualified technician must