What is the primary function of a fuse in electrical systems?

The primary function of a fuse in electrical systems is to prevent overload by breaking the circuit. A fuse is designed to protect electrical circuits by interrupting the flow of current when it exceeds a certain level, which can occur due to faults or overload conditions. When too much current flows through a fuse, it heats up to a point where the metal wire or strip inside melts, effectively breaking the circuit. This action prevents further damage to the electrical device or wiring caused by excessive current, reducing the risk of fire, equipment failure, and other hazards. Thus, the role of a fuse is crucial for maintaining safety and protecting against potential damage in electrical systems.