What device is commonly used to protect against overloads in electrical circuits?

A fuse is specifically designed to protect electrical circuits from overloads. It consists of a metal strip or wire that melts when excessive current flows through it, effectively breaking the circuit and preventing damage from overheating. This action safeguards equipment and prevents potential fire hazards that can occur due to high current levels.

In contrast, a capacitor is typically used to store and release energy in circuits but does not serve a protective role against overloads. A resistor is used to limit current in a circuit or divide voltage but again does not offer protection from overloads. A switch serves the purpose of controlling the flow of electricity, allowing it to be turned on or off, but does not provide any protection against overcurrent situations. The specific function of a fuse to cut off current flow under excessive load conditions makes it the most appropriate choice for overload protection in electrical systems.