B88069X8801B502

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GDT or Gas Discharge Tube Arresters, as its namesake explains, is a form or component of electronic components that is mainly used for limiting transient voltages on power lines, communications lines, and other types of electrical or electronic lines. GDT works by employing an insulating material like silicon that is filled with a gas, usually sulfur hexafluoride, to transform a circuit or a line from higher supply voltage to lower safe (operating) voltage during transient. Depending on the amount of voltage, the gas gets ionized and creates a low resistance path to the ground that safely dissipates the high voltage or energy and prevents damaging any sorts of circuitry.

The B88069X8801B502 application field and working principle is one example of GDT. These are zinc oxide based GDTs that are especially designed for supplying high performance guarding protection applications for both AC and DC power lines, telecom and satellite lines. It combines proven components, such as strong arcing horns, primary and secondary discharge elements, diodes, and resistors, into a single integrated package. This together with a high surge current capacity and high impulse current capability make the B88069X8801B502 specially suitable for dealing with transients of lightning and other surge sources.

The working principle of this GDT can be simplified to a few steps. Basically, the GDT is like a capacitor with a gap in its dielectric material. When no current flows, the gap is not conductive and the GDT looks like an open electrical circuit. However, as the voltage increases, it will eventually make the dielectric break down. The resistance then immediately drops from an undetermined high to a low level. This is due to a breakdown of the internal gas molecules and an electron avalanche. This phenomenon allows the current to discharge across the tube.

To ensure its safety and performance, all B88069X8801B502 series GDTs have lightning protection index (LPI) of 200V, frequency of 50/60 Hz, 10/1000 μs surge current rating of 125kA and 8/20 μs surge current rating of 20kA. They also boast lightning surge capability of 20kV, voltage rating from 300 Vac up to 5kV, capacitance of ≤1picofarad and <25 picoseconds of response time. Other features include 2-hole and 4- holes mounting options, wide voltage selection, high discharge capacity and single phase operation.

In short, GDTs including the B88069X8801B502 are crucial components for safeguarding electrical/electronic circuits from over-voltage transients and electrical surges. As surge current flows through the GDT, they ionize and dissipate the surge energy rapidly through an electrical arcing which in turn minimizes the energy and protects the downstream circuitry/devices.

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