2035-20-C

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Gas Discharge Tube Arresters (GDT) are a type of passive electronic component used to protect electrical circuits from overvoltage transients caused by lightning, electric surges, or other short-duration high-voltage events. Commonly referred to as "lightning arresters," GDTs have been used since the early 1900s and are widely used in electric transformers, power supplies, TV and phone signals, and other sensitive electrical systems and components. 20-C applications use GDTs to protect the electrical equipment and systems from any kind of electrical damage due to short-duration voltage surges.

20-C GDTs are constructed from a quartz or ceramic tube that is filled with a gas, such as sulfur hexafluoride or air. When connected to a power circuit, the arrester acts like a "short-circuit" for any transient voltage above a certain threshold. This allows the GDT to absorb the excess energy and limit the maximum voltage applied to the circuit, thus protecting the system from any potential damage caused by high voltages. In addition, the gas in the arrester is also capable of dissipating the excess energy, thus further reducing the voltage seen by the protected equipment.

When a transient voltage surge is applied to a GDT, a region of high electric field forms near the anode, which causes the gas in the tube to ionize, creating an ionized plasma channel. This ionized plasma channel behaves like a "short-circuit" between the anode and the cathode, thus dissipating the excess voltage. In a 20-C GDT, this process takes place in a few microseconds, allowing the protection circuit to react quickly and limit the maximum voltage that reaches the protected device.

GDTs are very robust components and are capable of withstanding short duration, high-energy voltage transients. They are also relatively small in size, making them especially suitable for applications where space is limited. Furthermore, the protection provided by GDTs is not exhaustive; they cannot protect against longer duration, low-energy voltage transients. For these applications, alternative devices such as varistors or surge suppressors are usually used.

GDTs are widely used in 20-C applications to provide protection from damaging high-voltage transients. In order to ensure that the protected equipment is adequately safeguarded, it is important to select the right type of GDT with the correct parameters. This includes factors such as voltage rating, current rating, time response and surge current withstand capability. Additionally, due to the hazardous emissions associated with GDTs, they must be installed in areas with sufficient ventilation to reduce the potential for accidental ignition of the gas.

Overall, GDTs are a type of protective device that can be used to protect sensitive electrical equipment and systems from the damaging effects of overvoltage transients. By using 20-C GDTs, it is possible to ensure that the protected equipment remains operational even during high-voltage transient events. Since GDTs are relatively small and cost-effective, they can be easily integrated into most electronics designs.

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