provided appropriate thermal isolation is used

you need a 3-pole contactor that can stand up to high-amperage demands without premature pitting or coil failure

as it provides a higher ceiling for electrical stress

This control is a direct OEM replacement part (replaces 571-100-006 in some configurations) and typically features a manual reset and LED status indicators for diagnostic clarity in the field

specifically optimized for Marvair wall-mount units and industrial HVAC systems

Lochinvar & A.O. Smith 100148403 Limit Switch 328140-751 provided appropriate thermal isolation isThe Lochinvar & A. O. Smith 100148403 Limit Switch is a critical OEM replacement part designed for high limit temperature protection in commercial water heaters, boilers, and pool heaters. This 175 degree high limit assembly monitors the heat exchanger or outlet water temperature, providing an essential safety cutoff to prevent thermal runaway and equipment damage. Engineered for HVAC systems requiring precise thermal regulation, the 100148403 ensures