Lochinvar & A.O. Smith 100074280 High Limit Switch

The Lochinvar & A.O. Smith 100074280 High Limit Switch is a temperature control component used in HVAC systems to monitor equipment for excessive heat conditions inside heating or water heating equipment. It is designed to open the electrical circuit when the internal temperature reaches a preset limit and regulate operating conditions within safe thermal ranges. This part is commonly used in water heaters where precise temperature sensing is required. It is positioned in the control assembly to support heat management in combustion or heating cycles, ensuring stable operation of connected system components during usage cycles.