10. GDT, Spark Gaps & Hybrid SPDs · 第 2／5 頁
Gas Discharge Tubes (GDT)
Common in signal lines and some hybrid power designs.
GDT behavior
A GDT ignites into a low-voltage arc under surge stress, then returns to high impedance afterward (with proper circuit design).
Use cases
Widely used on telecom/data protection; also appears in hybrid power SPD topologies.
Caution
GDTs alone may not provide the low Up needed by modern electronics—often paired with MOVs.