Lochinvar & A.O. Smith 100074412 High Limit Switch

The Lochinvar & A.O. Smith 100074412 High Limit Switch is a temperature-sensitive control used in boilers and water heating equipment to monitor operating conditions and interrupt the circuit if excessive heat is detected. It prevents overheating by signaling the system to stop operation until safe temperatures are restored. Commonly installed in commercial and residential heating application, this component supports safe performance during regular operation within HVAC systems. It contributes to equipment by maintaining temperature limits reducing the of heat-related interruptions and consistent operation throughout the heating cycle.