Which device is typically used to protect against short circuits?

A fuse is designed to protect electrical circuits from excessive current, which can occur during a short circuit. When a fault arises, such as a short circuit, the current surges significantly above the normal operating level. The fuse contains a metal wire that melts when this excessive current passes through it, breaking the circuit and preventing further damage to the electrical system or connected devices.

The purpose of a fuse is not just to interrupt the current flow but also to ensure that the circuit and any appliances connected to it are shielded from harm. This preventive measure is vital in safeguarding against potential hazards, such as electrical fires or equipment failure, that can result from short circuits.

In contrast, while surge protectors defend against voltage spikes and isolator switches disconnect circuits, neither specifically addresses the high current flow caused by a short circuit. Power factor correctors focus on improving the efficiency of electrical systems rather than providing protection from circuit faults.