26. GDT Identification & Basics

Question.6

Tony is soldering a 2-electrode GDT onto a PCB for telecom line protection.
Does the GDT have polarity? Can it be installed in either orientation?

Yes — the dot on the schematic symbol indicates the cathode; install accordingly
Yes — the end with the manufacturer marking must face the line side
No — GDTs are non-polarized and can be installed in either direction
No — but only 2-electrode GDTs are non-polarized; 3-electrode GDTs have polarity

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