What is the function of fuses in electrical systems?

Fuses serve a critical purpose in electrical systems by protecting circuits from excessive current. When an electrical circuit experiences a surge in current beyond the safe operating level, the fuse acts as a safety device by melting or breaking the circuit. This interruption prevents potential damage to wiring, electrical components, and connected devices that could occur due to overheating or excessive load.

The primary role of fuses is to ensure safety rather than enhancing efficiency, regulating voltage, or improving current flow. While other components in an electrical system may seek to regulate voltage or control the flow of current, fuses are specifically designed for safety and protection, making option B the accurate choice in this context.