Lochinvar & A.O. Smith 100074280 High Limit Switch

The Lochinvar & A.O. Smith 100074280 High Limit Switch is a temperature safety control used to monitor operating conditions and interrupt electrical operation if excessive heat is detected. Commonly installed in commercial and residential water heating equipment, it assists in maintaining safe temperature limits during normal system operation. Within HVAC systems this component operates alongside heating controls to connect equipment to prevent overheating and support consistent performance. It contributes to proper safety management by responding to abnormal temperature increases ensuring that the system operates within its intended thermal range while reducing heat-related operational issues.