9400100000

Series:	--
Packaging:	Bulk
Lead Free Status / RoHS Status:	--
Part Status:	Obsolete
Voltage - DC Spark Over (Nom):	90V
Impulse Discharge Current (8/20µs):	2500A (2.5kA)
Tolerance:	--
Fail Short:	--
Mounting Type:	DIN Rail
Package / Case:	Module

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Introduction

Gas Discharge Tube Arresters (GDT) are protective devices that guard electrical equipment against danger caused by the static, electrical, and surge currents. The term “arrester” is derived from the old French verb arrestor which means “to stop.” In other words, an arrester dissipates a surge current or voltage by providing a low impedance path. GDTs are used to protect sensitive electronic components from damage due to extreme voltage.

Theory of Operation

When a surge voltage appears on a GDT, the arc voltage drops to the point where the arrester will conduct current. The arrester acts as a high speed switch that will divert the energy away from the protected equipment to a ground potential. The arrester then prevents the surge from reaching and damaging the equipment.The working principle of a GDT is based on the fact that a gas discharge tube can be used to shunt high voltage currents to a grounded connection. This is done by having the device draw a spark that jumps from a micro-sized opening in the tube to the contact point. This spark discharge reduces the voltage on the line and prevents it from reaching the equipment.

Applications

Gas discharge tube arresters are used to protect electronic circuits, components and equipment from damage caused by surge voltages. GDTs are used in applications such as telecommunications, broadcast, power lines, computers, industrial automation, aerospace, medical equipment, and high voltage power switching circuits.GDTs are also used to protect power conditioning and measurement systems from out of range voltage surges. They can also be used to protect electrical systems from lightning strikes by providing a low impedance path to the ground.In addition, GDTs are used in power equipment such as transformers, switchgear, cables, capacitors, power rectifiers, optoisolators, and more. These devices act as safety devices that protect the components from out of range voltage by providing a low impedance path to the ground.

Advantages

Gas discharge tube arresters have several advantages over other over-voltage protection devices. They provide a low impedance path to the ground, which reduces the risk of damage. They also have a very fast response time and are able to override the surge current quickly. Since GDTs are sealed devices, they do not require maintenance or replacement. This makes them cost-effective solutions compared to other over-voltage protection devices. Furthermore, GDTs do not interfere with the signal flow during normal operation, since they have extremely low leakage currents. This makes them ideal for sensitive circuits and critical applications.

Conclusion

In conclusion, Gas Discharge Tube Arresters (GDT) are electronic devices used for over-voltage protection. They provide a low impedance path to the ground to prevent out of range voltage and surge currents from reaching the protected equipment. GDTs are used in various applications, such as telecommunications, broadcast, power lines, computers, industrial automation, aerospace, medical equipment, and high voltage power switching circuits. They have several advantages over other protection devices, such as low maintenance, low cost, and fast response time.

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