What is true regarding the voltage rating of a fuse?

The correct answer highlights that a fuse must have a voltage rating that is higher than the circuit voltage in which it is used. This is important because a fuse is designed to protect a circuit from overcurrent conditions, and it must be capable of safely interrupting the circuit when a fault occurs without failing at normal operating conditions.

Using a fuse with a voltage rating that is too low can lead to dangerous situations; the fuse may blow during normal operation due to the voltage exceeding its rating, which could also prevent it from operating effectively when needed. Therefore, having a fuse with a higher voltage rating ensures that it can operate safely within the given electrical system and will function properly to protect the circuit.

In practice, while there can be some flexibility in the exact voltage rating of a fuse, it is crucial to choose one that exceeds the operational voltage of the circuit to ensure safety and reliability.