the brass trim and bronze body are rated for saturated steam up to 38 psig

this relay handles steady-state currents up to 10 Amps

ensuring the heat exchanger is protected against overheating conditions caused by airflow obstructions or blower failure

providing the fast

The external equalizer port monitors the actual pressure at the evaporator outlet

Lochinvar & A.O. Smith 100074280 Limit Switch 318518-761 the brass trim and bronzeThe Lochinvar & A. O. Smith 100074280 High Limit Switch is a critical safety component engineered to provide thermal protection in high efficiency heating systems. Designed as a genuine OEM replacement part, this switch monitors the internal temperature of the heat exchanger or burner door to prevent unsafe operating conditions. If temperatures exceed the factory defined safety threshold, the 100074280 triggers an immediate system lockout to mitigate