What is the purpose of a lightning arrestor?

The purpose of a lightning arrestor is to provide a path to ground for lightning voltage surges. This device is designed to protect electrical equipment and structures from the damaging effects of lightning strikes by safely redirecting the high voltage and current away from sensitive components. When lightning strikes, the arrestor activates and allows the surge to flow into the ground, thereby preventing the surge from causing damage or creating dangerous conditions in the power system.

This protective mechanism is crucial in maintaining the integrity of electrical systems, particularly in areas prone to thunderstorms and lightning activity, ensuring the safety and reliability of power transmission. Other options, while relating to electrical concepts, do not address the specific role of a lightning arrestor in grounding excessive surges from lightning events.