Which statement about surge protection devices is true?

Surge protection devices are designed to protect electrical equipment from voltage spikes or surges that can occur in various conditions, not limited to storms. The correct understanding of these devices is that they function by diverting excess voltage away from sensitive electronic components, thus preventing potential damage.

When a surge occurs, whether from a lightning strike, a power outage, or equipment turning on and off within the electrical system, the surge protection device acts as a buffer, directing the sudden influx of voltage away from connected equipment and safely to the ground. This helps ensure that electrical systems and devices can operate correctly without the risk of damage from unexpected and harmful voltage increases.

The other statements do not accurately reflect the capabilities and purpose of surge protection devices. They do not prevent all electrical failures, as surges are just one type of electrical issue; they are not limited to operation during storms; and they are quite essential in modern systems to safeguard equipment from increasing reliance on sensitive electronics.