What is the role of a fusible link in a furnace?

A fusible link is a critical safety device in a furnace system. Its primary role is to act as a mechanical safeguard that will automatically shut off the furnace when certain hazardous conditions arise, primarily due to excessive heat.

In the event that the furnace overheats, the fusible link is designed to melt at a predetermined temperature. This melting action disrupts the circuit powering the furnace, effectively stopping its operation and preventing further dangerous conditions, such as potential fires or damage to the furnace components. By ensuring that the furnace can shut down safely under extreme conditions, the fusible link contributes significantly to the overall safety of the heating system, making it an essential component within many types of furnaces.