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Gas Discharge Tube Arresters (GDT)

GTCT37-900M-P10 is a Gas Discharge Tube Arrester (GDT), which is typically used in electronic devices to protect against overvoltage. It is a passive two-terminal electronic component that consists of a cylindrical shape, filled with a dielectric carbon dioxide (CO2) gas or an inert gas. When subjected to an electrical signal, it can absorb a large electric current, reducing the overvoltage. It can be used for a range of different applications, including protecting electronic circuits from power surges, electrical noise, and lightning and related overvoltage.

Application Field

GDT is a versatile component that can be used where high speed current protection is required, such as in DC/AC power supplies, interference filters, communications equipment, power supply modules (e.g. UPS, SMPS), electric and automotive ignition systems, and other applications. In short, the GDT makes it possible to protect digital and sensitive electronic circuits from hazardous overvoltage, providing protection from ground faults and electromagnetic emitted radiation. It is compatible with current limiting circuits used in many high-voltage and high-power systems. The GDT can be effectively used in both AC and DC power systems, being suitable for many different electronic components.

Working Principle

When the protection voltage is exceeded, the arrester will operate in two stages. First, an electric current will begin to flow through the device, causing the internal gas to ionize. This will reduce the resistance of the entire device, allowing a larger amount of current to flow. At this point, the device begins to dissipate the electrical energy through the electrodes. As the discharge progresses, the arc begins to extinguish itself as the kinetic energy builds up, reducing both the temperature and pressure of the gas. The exact operation of the GDT depends on the voltage level and in some cases, this device can completely short circuit the circuit.

The higher the voltage is, the greater the current dissipating through the GDT device. During this process, the dielectric carbon dioxide gas creates an arc that can heat up to around 8,000°C, releasing energy in the form of heat and light. Under normal circumstances, the arrester will dissipate the energy quickly so that it doesn’t disrupt the continuity of the circuit. Thanks to its characteristic of dissipating large amounts of energy quickly, GDT can be also used as lightning arresters, protecting electrical systems from lightning strikes.

In summary, GDT is a versatile component, usually used to protect sensitive electronic circuits from lightning strikes, power surges and other overvoltage. A device like GTCT37-900M-P10, usually consists of a cylindrical shape filled with a dielectric gas. When exposed to an electric signal, the internal gas ionizes, reducing the resistance of the GDT and allowing a larger amount of current to flow. During this process, the GDT dissipates the energy quickly so that it doesn\'t disrupt the continuity of the circuit, making it suitable for many applications.

Conclusion

Gas Discharge Tube Arresters (GDT) induce a self-closing electric arc within a dielectric gas, enabling them to safely absorb and dissipate large amounts of energy. GTCT37-900M-P10 is a GDT that is typically used in electronic devices to protect against overvoltage and is suitable for a range of different applications including power supply modules, ignitions systems and interference filters. The GDT begins to dissipate energy when exposed to an electric signal, reducing the resistance of the GDT and allowing a larger amount of current to flow. Thanks to its capability of dissipating large amounts of energy quickly, GDT can be effectively used to protect electronic circuits from hazardous overvoltage.

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