By utilizing a single-pole single-throw (SPST) switch

as this Bard furnace high limit switch is often the first indicator of restricted airflow or a fouled evaporator coil

It is highly recommended to use this genuine OEM part

Key Benefits High-Amperage Capacity: Robustly handles up to 25A at 240VAC

Enhanced Thermal Protection: The ambient compensated bimetallic overload prevents nuisance tripping caused by high ambient temperatures in electrical rooms

TE Connectivity 27E121 Panel/Rail Mount R-22 By utilizing a single-pole single-throwThe TE Connectivity Potter & Brumfield 27E121 is a heavy duty, 3 pole relay socket engineered for industrial control panels and automation assemblies. Designed for versatility, this 11 pin square base socket supports panel mounting via dual screw slots or secure DIN rail mounting using standard track clips. With a robust 15 Amp current rating and a 300V voltage threshold, it provides a stable electrical interface for power relays in high demand HVACR