What is the primary function of a fuse in an electrical circuit?

The primary function of a fuse in an electrical circuit is to prevent overcurrent. A fuse is a safety device designed to protect electrical circuits by breaking the circuit when the current flowing through it exceeds a certain level. When there is an overcurrent situation—such as a short circuit or overload—the fuse element melts and creates an open circuit, thus stopping the flow of electricity and preventing potential damage to the electrical components or the risk of fire.

Fuses are critical for safeguarding equipment and ensuring safety in electrical installations. They are not involved in increasing or measuring voltage, which are functions related to other electrical components, nor do they stabilize current. The primary role of a fuse is fundamentally about protection against excessive current flow.