28. GDT Applications

Question.1

A company installs instruments with 230VAC power input and a GDT connected for surge protection.
Within three months, nearly 10% of units are returned with burnt PCBs. The copper foil from the AC connector to the GDT is completely burned.
What caused this repeated failure?

The GDT's DC sparkover voltage was too low — it fired during normal mains voltage
The GDT's surge current rating was insufficient for the lightning event
After a surge fired the GDT, with Low ARC voltage — creating a short circuit
The GDT was installed in the wrong orientation

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