Williams P200400 Selector Switch making it a reliable choice

making it a reliable choice for ceiling plenum installations where environmental stability is critical

Optimized Airflow: Engineered with side-vented slots to maintain proper pneumatic sensor sensitivity and response time

Universal Frequency: Rated for 50/60 Hz

vibration-resistant fit to standard float rods

Whether you are servicing a Series 21 make-up air unit or a Series 20 space heating system

Williams P200400 Selector Switch making it a reliable choiceThe Williams P200400 F145 30F Selector Switch is a critical temperature actuated control engineered specifically for Williams Forsaire Direct Vent Wall Furnaces and high performance HVAC systems. This OEM Williams P200400 component functions as a dual point thermal safety and operational interface, maintaining precise system thresholds at 145F and 30F. Built with a robust toggle mechanism, it serves as a protective switch to safeguard heat exchangers