Lightning Arrester

A Lightning Arrester, also known as a surge arrester or a lightning diverter, is a device used to protect electrical and electronic equipment from damage caused by lightning strikes or other high-voltage surges. It is classified under the supply class Fuses, Arrestors, Absorbers, and Protectors in the supply group Electrical and Electronic Equipment Components.

Lightning arresters are designed to divert the excess electrical energy from a lightning strike away from the equipment it is protecting. They provide a low-resistance path for the surge current to flow into the ground, preventing it from damaging the connected equipment.

There are two main types of lightning arresters:
1. Rod or rod-gap arresters: These consist of a metal rod or rods that are connected to the equipment being protected. When a surge occurs, the voltage across the rod(s) ionizes the air, creating a conductive path for the surge current to flow into the ground.
2. Metal-oxide varistor (MOV) arresters: These use a metal-oxide disc that exhibits a high resistance under normal operating conditions. When a surge occurs, the voltage across the disc decreases its resistance, allowing the surge current to be diverted to the ground.

Lightning arresters are commonly used in power distribution systems, telecommunication networks, and other electrical installations to protect sensitive equipment from the damaging effects of lightning strikes and voltage surges. They are an essential component in ensuring the reliability and safety of electrical and electronic systems.