28. GDT Applications

Question.5

Tony places a 90V GDT on a 5V DC power rail for surge protection.
During a transient event, the rail experiences a 50V spike.
Does the GDT protect the circuit?

90V-GDT-Connected-for-5VDC-Connection-Diagram

Yes — 50V is within the GDT's operating range
Yes — the GDT will partially conduct and clamp at 50V
No — 50V is below the GDT's 90V DC sparkover; the GDT does not fire at all
No — GDTs cannot be used on DC systems

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