Gas Discharge Tube Arresters (GDT) are essential protection components widely used in the lightning protection of communication systems. Typically employed in the first or first two stages of a multistage protection circuit, GDTs effectively discharge lightning-induced overcurrent and limit overvoltage, safeguarding electronic equipment.

Common GDT types include two-pole discharge tubes and three-pole discharge tubes, with ceramic enclosures, also referred to as ceramic discharge tubes, offering durability and reliability. These components are integral to ensuring system safety and longevity in high-risk environments.