SL1021B600RF

Series:	SL1021B
Packaging:	Tray
Lead Free Status / RoHS Status:	--
Part Status:	Active
Moisture Sensitivity Level (MSL):	--
Voltage - DC Spark Over (Nom):	600V
Impulse Discharge Current (8/20µs):	20000A (20kA)
Tolerance:	--
Number of Poles:	3
Fail Short:	Yes
Mounting Type:	Through Hole
Package / Case:	Axial Cylinder, 3 Lead (Radial Bend)

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Gas Discharge Tube Arresters (GDT): SL1021B600RF Application Field and Working Principle

Gas Discharge Tube Arresters (GDT) are commonly used in the electrical power industry. These devices provide protection from lightning superimposed transients on power lines of telecom systems. GDTs use a combination of a conductive gas, an ionized medium, and a voltage spark gap to arrest surges and thus protect the equipment from damage. The SL1021B600RF arrester is an example of a GDT designed specifically for telecom applications, featuring a UL listed metal oxide varistor. The following article describes the specific application field and working principle of the SL1021B600RF GDT.

Application Field

Ingress and egress CO/CPE will be protected from electrical and lightning transients on telecom networks using the SL1021B600RF GDT arrester. This device is designed for Digital Subscriber Lines (xDSL) services, protocols and access network topologies, and is applicable for both copper line telephone and optical fibre forms of transmission.

Working Principle

The working principle of the SL1021B600RF GDT is based on the phenomenon that, in high electrical fields, a conductive gas between closely spaced electrodes will become ionized and break down, forming an electrical arc. When a transient surge of electrical energy is applied to the electrodes, the gas ionizes, resulting in an arc which breaks down and dampens the surge. This ‘arcing’ action dissipates the energy applied to the arrester, and thereby shields the main telecom system from transient surges.The SL1021B600RF GDT arrester uses a combination of a conductive gas, an ionized medium, and a voltage spark gap to protect the telecom system from transients. The voltage spark gap works in combination with the gas to form a network of electrical resistance in the arrester. A resistor is used to limit the current that flows through the device, and a varistor (metal oxide surge arrester) is used to reduce the peak voltages from lightning transients. Both of these components are single-pole, meaning that all lightning strokes are directed to the ground plate.The SL1021B600RF GDT arrester also features an LED indicator to indicate a normal-longer arc or rapidly-recovering arc. This will allow maintenance personnel to easily inspect the device and ensure that it is in optimal working condition at all times.

Conclusion

The SL1021B600RF GDT arrester is designed to provide reliable protection from lightning transients for telecom networks. It utilizes a combination of a conductive gas, an ionized medium, and a voltage spark gap to control surges and thus protect the equipment from damage. The device is designed for applications on copper line and optical fibre transmission systems, and its LED indicator allows for easy maintenance.

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