The Bosch HVAC 63030949 Flaming Resignation Thermal Fuse 77°C is a temperature-sensitive safety component designed for compatible Bosch HVAC equipment. It protects the system by opening the electrical circuit when surrounding temperatures reach approximately 77°C, helping prevent overheating and potential component damage. Commonly used in furnaces, air handlers, and other heating equ... https://www.partshnc.com/bosch-hvac-63030949-flaming-resignation-thermal-fuse-77-c