The York S1-024-35596-000 Auto Limit Switch is a safety control device designed to monitor temperature levels in HVAC systems. It works by automatically opening the electrical circuit when excessive heat is detected, preventing overheating and potential equipment damage. Once temperatures return to normal, it resets to restore operation. Commonly used in furnaces and air handlers, it ensures safe and reliable performance. Its use enhances system protection, improves operational efficiency, and reduces the risk of costly repairs, making it essential for dependable HVAC operation.