27. GDT Operation & Characteristics

Question.1

Tony uses a Littelfuse CG90L GDT (DigiKey: CG90L) to protect a telecom line.
The GDT has a DC sparkover voltage of 90V (typical).
A lightning-induced surge with a rise rate of 1 kV/µs hits the line.
At what voltage will the GDT actually fire?
Note — Refer to the datasheet from DigiKey- click here

90V — the nominal DC sparkover voltage
108V — the maximum DC sparkover voltage
400V — the impulse sparkover at 100 V/µs
600V — the impulse sparkover at 1 kV/µs

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