What are fuses used for in electrical systems?

Fuses are critical components in electrical systems specifically designed to protect circuits from overload. When the current flowing through a circuit exceeds the fuse's rated capacity due to a fault or short circuit, the fuse will melt or blow, breaking the circuit. This action prevents excessive current from damaging electrical components, wiring, or appliances connected to the circuit, thereby safeguarding both the equipment and the electrical installation.

In contrast, the other options do not accurately represent the primary function of fuses. While boosting electrical power, regulating voltage levels, and improving energy efficiency are important concepts in electrical engineering, they are not roles that fuses play within a circuit. Fuses focus solely on providing a protective mechanism to avoid dangerous and costly electrical failures. By understanding the specific function of fuses, one can appreciate their essential role in ensuring safety in electrical installations.