What is true about the functionality of a surge arrestor?

A surge arrestor is designed to protect electrical systems from voltage spikes and surges, typically caused by lightning strikes or switching operations. The correct answer highlights that a surge arrestor can repeat its functions, which means it can respond to multiple surges over its operational life as long as it is not damaged or degraded.

Surge arrestors work by diverting excess voltage away from sensitive equipment, effectively clamping the voltage to a safe level. After an event that triggers the surge arrestor, it can reset and be ready to respond to subsequent surges. This repeated response capability is crucial in environments where electrical surges may occur frequently, ensuring ongoing protection for equipment and systems.

The other options suggest limitations or mischaracterizations of a surge arrestor's functionality, such as being a one-time use device or being incapable of providing protection against surges, which does not align with the fundamental role of surge arrestors in electrical protection systems.