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Gas Discharge Tube Arresters (GDT) are a type of electronic device that is used to protect circuits from transient voltages or surges.They are used primarily to protect equipment from high voltages caused by lightning strikes. GDTs are constructed using a glass tube with electrodes at the two ends. The electrodes are connected to a power supply and when an overvoltage occurs, it triggers a gas discharge within the tube. The resulting charge is then dissipated, preventing any further damage.The application of GDTs dates back to the 1950s and they continue to be a popular choice for applications that require protection from voltage surges. GDTs are widely used in industrial, commercial, and residential settings, and have been an effective way of guarding against power surges for decades. GDTs are also used as an additional line of defense against voltage spikes caused by lightning strikes, power-grid failures, and other electrical events.For a GDT to work effectively, an appropriate voltage rating needs to be chosen to match the application. Higher voltage ratings provide greater protection. GDTs can also be combined with other protective devices, such as fuses and circuit breakers, to increase the protection level. In some cases, GDTs are used in conjunction with surge protectors to give a comprehensive protection strategy.GDTs work by using a variety of physical mechanisms. The most common of these is the gas discharge tube. This consists of a gas-filled glass tube with electrodes at each end. When an overvoltage occurs, the gas within the tube ionizes, forming a conductive plasma. The electric charge generated by the ionization causes a current flow which dissipates the energy of the overvoltage.As well as the gas discharge tube, GDTs may also use metal-oxide varistors (MOVs) or positive temperature coefficient (PTC) resistors. MOVs work by using a non-linear resistance, which changes with any fluctuation in voltage. This results in the voltage automatically being limited to a safe value. PTC resistors work by using a semiconductor material which has a positive temperature coefficient. This means that the resistance increases with the temperature, causing a voltage decrease and protecting against overvoltages.GDTs are an important technology for protecting against voltage surges and lightning strikes. They use physical mechanisms to dissipate large and sudden surges of current, and are commonly used in a variety of applications, including in industrial, commercial, and residential settings. GDTs are designed to work effectively if properly selected and installed, and are therefore an important tool in the process of protecting against power surges and other electrical events.

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