2026-30-CB

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Gas Discharge Tube Arresters (GDT) are electrical devices that allow a high voltage surge current to pass through a conducting channel. These devices are typically used in applications where a large current peak is necessary to protect against the effects of high voltage spikes. The current peak can be up to several thousand amperes, which is significantly higher than the rated capability of standard circuit breakers. The surge current is able to travel through a channel comprised of a conducting metal strip and a gas-filled tube.

In a typical CB application field, such as power lines, gas discharge tube arresters can be installed last in line at a site. This allows the GDT to serve as the primary protection device from any high-voltage surges. As such, they can limit any destructive overvoltages that could otherwise damage expensive equipment or disrupt service. The GDTs can also be used as secondary protection devices, serving as an additional layer of protection from any unexpected lightning strikes or surges.

It is important to understand the basic working principle of GDT arresters. When an overvoltage surge occurs, the voltage pulse is directed into the GDT. This initiates a spark that ionizes the gas in the inner channel of the device, thus forming a conducting path between the two electrodes. The conducting path allows the surge current to travel through to ground. The ionized channel will sustain the spark until the surge voltage drops sufficiently, at which point it will cease operation and the GDT will reset itself for future use.

GDT arresters offer an ideal solution for the protection of electrical components from high-voltage spikes. They are capable of withstanding peak currents up to several thousand amperes while providing reliable protection against the detrimental effects of overvoltage. Additionally, as resetting units, they can be used multiple times if necessary, saving the cost of a replacement after each incident. As such, GDTs continue to provide an effective and economical solution for many applications requiring surge current protection.

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