The Marley Engineered Products 4520-0011-000 Auto Limit Switch is a temperature-sensitive safety control designed for use in electric unit heaters and other heating equipment manufactured by Marley Engineered Products. This automatic limit switch monitors internal temperatures and interrupts electrical power if overheating occurs, then resets once safe conditions are restored. It prot... https://www.partshnc.com/300f-cu-auto-limit-switch