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Gas Discharge Tube Arresters (GDT)

Utilizing gas discharge tubes, or GDTs, for electrical protection is an effective way to safeguard against surges. Gas discharge tube arresters (GDTs) are commonly used in high-voltage systems, but can be practical for audio, video, and telecommunication applications. 20KV/300 mA GDTs are designed to provide an excellent barrier to lightning strikes or overvoltage transients. When the surge voltage exceeds the reference voltage of the arrester, a spark gap occurs in the GDT, and the surge voltage is discharged. This prevents a surge from entering the protected system and causing damage.

How GDTs Work

Gas discharge tube arresters function by utilizing a gas medium, typically a noble gas, along with two electrodes sealed in an insulated glass. Once the voltage surpasses the reference level, the gas arc behaves like a spark, effectively dissipating the surge voltage. More specifically, the metal oxide arrested conducts electricity when the voltage surpasses its specific gap value. The current flow will be much higher during the discharge process than normal. Eventually, the arrester begins to act as a resistor, blocking the surge current and protecting the device downstream.

Types of GDTs

The PTC type gas discharge tube arrester is the most common type used in 20KV/300 mA applications. These arresters are designed to operate in extremely low current and with low capacitance. Since their design allows for a low capacitance and fast response time, these types of arresters are perfect for applications where low leakage current and low input capacitance may be necessary.

The GTO, or gate turn off, type arrester is also commonly used in 20KV/300 mA environments, and they are designed to protect circuits even in the presence of strong surges. These arresters are able to withstand short circuits, overloading, and rapid temperature changes in the results of surge protection.

The TVS type can be the most effective when it comes to 20KV/300 mA application in order to safeguard against surges. This type of gas discharge tube arrester is able to utilize a higher capacitance to reduce the voltage spike, while still providing an effective surge protection. These types of arresters are also perfect for applications where low leakage current and low input capacitance may be necessary.

Applications and Benefits

GDTs offer one of the most effective means for protecting 20KV/300 mA operations. Although they have a limited response time, GDTs are capable of handling any surge events, from lightning strikes to spikes caused by normal operations. This makes them perfect for protecting equipment, wiring, components, and systems connected to the electrical network that would otherwise be affected by power surges.

These arresters can also be applied across long cable runs, often using a combination of a combination of common mode and differential mode suppression. This helps to minimize the common mode EMI (electromagnetic interference) and enhances signal integrity. In addition, GDTs do not require any maintenance or periodic testing, making them an attractive cost-effective solution.

Finally, GDTs can be designed to meet a variety of application specific requirements. This makes them an ideal choice for applications in areas with harsh environments or intense electromagnetic interference. With the right GDT it is possible to ensure that the power supply is kept safe and functioning optimally in all applications.

Conclusion

Gas discharge tube arresters, GDTs, are capable of providing an effective barrier to voltage surges, lightening strikes, and overvoltage transients. These arresters can be used in high-voltage systems, as well as in audio, video, and telecommunication applications. The 20KV/300 mA GDTs are able to withstand short circuits, overloading, and rapid temperature changes due to surge protection, making them an ideal choice for protecting electronics, systems, and equipment connected to the electrical network.

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