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Gas Discharge Tube (GDT) Arresters are designed to protect sensitive electronic and communication equipment from lightning strikes and inductive voltage spikes. These devices use a specific type of air gap (usually gas) to create an electrical barrier between the power lines and the equipment. When voltage spikes occur, a spark initiates across the air gap, restricting the flow of electricity and allowing the surge to dissipate without causing any damage to the equipment. The gas discharge tubes are also referred to as Spark Gap Arrester, Spark Gap Arrest Shield, or just simply an Arrester.

GDT Arresters are commonly used in a variety of industries including telecommunications, power plants, and industrial environments. The GDT Arrester is typically configured in a single line or multiple line design depending on the application and the voltage level. A single line GDT Arrester is typically used on low voltage (<1000V) and multiple line designs are generally used on high voltage (1000V-250kV) applications. The multiple line design provides a higher breakdown and an increased level of safety compared to the single line design.

The working principle of GDT Arrester is simple. The device consists of two electrodes: a primary electrode (anode) and a secondary electrode (cathode). When there is an abrupt increase in the voltage level above a pre-determined threshold, the spark gap begins to break down. This process is known as high-field ionization. During this process free electrons from the primary anode collide with other electrons or atoms of the air gap, creating ions and a conductive plasma. As the electrons move through this newly created plasma conduction channel, the voltage path is blocked, thereby limiting the amount of current that can pass through and directing it away from the equipment.

In addition, the GDT Arrester has several important features. The first is its high voltage capability, typically up to 250kV, which allows it to effectively dissipate high energy pulses with no permanent damage. Secondly, the spark gap provides a fast response time. Typically, its response time can range from 10 microseconds to 2 milliseconds. This quick response time is important in protecting sensitive equipment such as amplifiers, antennas, and sensors. Finally, the GDT Arrester has a relatively low capacitance value, typically 0.4-2.5 pF, which makes it suitable for use in high-speed systems such as radio frequencies and microwaves.

Overall, Gas Discharge Tube Arresters (GDTs) have many valuable features and are commonly used all over the world. They are designed to protect sensitive electronic and communication equipment from lightning, inductive voltage spikes, and other related transient events. GDTs provide a truly effective way to protect the equipment and ensure it to perform with maximum reliability and efficiency.