What device is used to protect the distribution system from overcurrent conditions?

Fuse links are designed specifically to provide overcurrent protection in electrical systems, making them a crucial component in safeguarding the distribution system. When the current flowing through the fuse link exceeds a predetermined level, the fuse melts or "blows," interrupting the circuit and preventing potential damage from overcurrent situations. This mechanism is essential in protecting both the distribution equipment and the electrical load from excessive current that could lead to overheating, fires, or system failures.

Other devices mentioned, while they play various roles in electrical systems, do not specifically serve as overcurrent protective devices in the same manner as fuse links. For example, transformers are used to step up or step down voltage levels but do not directly provide protection against overcurrents. Circuit breakers also provide overcurrent protection but operate on a different principle, involving mechanical components that can reset the circuit after tripping. Diodes, on the other hand, regulate current direction and are fundamental to controlling electrical flow but do not offer protection against overcurrent conditions.