Depends on the working of Gas Discharge Tube.
A gas tube is an over voltage device that shunts current when a threshold voltage (the spark-over voltage) is reached. These are typically rated from 90V to 600V. It contains ionized gases.
When a voltage disturbance reaches the GDT sparkover value, the GDT practically shorts the line, diverting the surge current through the GDT to ground.
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