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Gas Discharge Tube Arresters (GDT)

2027-23-C Application Field and Working Principle

Gas Discharge Tube Arresters (GDTs) are used for protecting electronics systems and devices from voltage surges that may be generated by lightning and from other over voltage occurrences. These arresters, usually designated by a generic number such as 2027-23-C, have the function of diverting the high voltage and limiting the amount of energy reaching the equipment that must be protected. The GDTs are connected in a parallel circuit with the protected system.

The name 2027-23-C GDT is composed of a number of components:

• 2027: represents the peak amplitude value (in volts) that the discharge tube can handle without sustaining damages;
• 23: is the breakdown voltage which is the voltage at which the discharge tube initiates the conduction of current;


• C: is the time rating of the device, its maximum clamping voltage at 8x20s impulse voltage.

The working principle of a GDT is based on the avalanche effect, where a strong electric field causes the discharged gas inside the tube to break down. When the voltage crossing the tube exceeds the rated breakdown voltage of the tube, a spark is formed, and the current begins to flow across the tube. Once the spark is initiated, the current increases rapidly, in a process known as avalanche breakdown. This causes a large current to surge through the GDT, which limits the voltage across the protected system.The 2027-23-C GDT is meant for lightning protection, and its design is based on a voltage divider principle. When lightning strikes, it will cause a large surge of voltage, usually in the order of tens or hundreds of kilovolts. This surge of voltage will then be diverted to the GDT, which will reduce it to a more manageable level. The voltage divider is designed to reduce the surge of voltage to a safe level that is within the safe operating range of the protected equipment.

The GDT is a robust and reliable protector against lightning and other overvoltage occurrences. The internal construction of the GDT is such that it can dissipate a great amount of energy, increasing its lifetime and reliability. The 2027-23-C GDT is also resistant to UV light, corrosives, and extreme temperature changes. It also has a low leakage current, so that it does not interfere with the normal operation of the equipment. It is important to install GDTs correctly to ensure optimal performance. The correct GDT must be chosen for the application, and the installation must be done according to manufacturer specifications. It is also vital to use shielding materials when installing GDTs, as this will help to reduce the chances of a lightning strike damaging the protected equipment.

In conclusion, the 2027-23-C GDT is a powerful surge protector capable of withstanding and dissipating overvoltage conditions, with features such as a high peak amplitude, breakdown voltage, and clamping voltage. Its robust construction ensures long life and reliable operation, and with correct installation, it will provide excellent protection against lightning strikes and other overvoltage occurrences.

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