28. GDT Applications

Question.6

A 48V telecom system uses a GDT with a nominal DC sparkover voltage of 50V (±20% tolerance).
The GDT fires randomly during normal operation, disrupting service.
Why is this happening?

The GDT is defective and should be replaced with the same part
The system voltage (48V) exceeds the GDT's minimum DC sparkover (40v)
The GDT's capacitance is too high for the telecom line
The GDT's surge current rating is too low

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