What is found inside of a fuse?

Inside a fuse, there is a thin metal wire or filament that is designed to melt and break the circuit when excessive current flows through it. This wire is typically made from a material with a low melting point, allowing it to quickly respond to overloads. The fuse is encased in a protective housing, which can be made of glass, plastic, or ceramic, to prevent exposure to the melting wire and to contain any potential sparks or debris. This safety mechanism helps prevent damage to electrical devices and reduces the risk of fire.