A lightning arrester, also known as a surge arrester, is a critical safety device installed on power and communication systems to defend against high-voltage injuries, such as those caused by lightning or electrical switching. Under normal operation, it acts as a high-resistance barrier, allowing electricity to flow only through designated paths. However, when an over-voltage surge hits—far exceeding the system’s usual range—it swiftly becomes conductive, providing a low-impedance channel that safely diverts the dangerous current into the earth, thereby protecting transformers, wiring, sensitive electronics, and preventing fires or electric shocks
