Question

How are lightning conductors different from lightning arrester

Answer 1

A lightning rod (US, AUS) or lightning conductor (UK) is a metal rod mounted on a structure and intended to protect the structure from a lightning strike. If lightning hits the structure, it will preferentially strike the rod and be conducted to ground through a wire, instead of passing through the structure, where it could start a fire or cause electrocution. Lightning rods are also called finials, air terminals or strike termination devices.

Answer 2

Lightning arrester works like surge arrester from outside of the conductor. They absorb the electrical surges in the transmission tower itself. Lightning rod is a pre protection device.