What is the primary function of fuses in electrical systems?

Fuses play a crucial role in electrical systems by acting as safety devices designed to protect circuits from excessive current flow. When current levels exceed a predetermined threshold, the fuse will break the connection, effectively disconnecting the circuit and preventing potential damage. This function is essential because overcurrent situations can lead to overheating, electrical fires, and damage to appliances or wiring.

The design of a fuse is such that it responds to excessive current by melting a wire or filament within it, thereby interrupting the electrical flow. This automatic response is vital for safeguarding the integrity of the system and ensuring the safety of both equipment and individuals.

In contrast, the other options describe functions that do not pertain to fuses. Fuses do not amplify current flow, store energy, or convert types of current; their entire purpose is centered around protection from electrical hazards by interrupting current when necessary.