Learning path
From lightning concepts to low-voltage power-line SPD products—a structured guide for engineers, panel builders, and local partners.
10. GDT, Spark Gaps & Hybrid SPDs · Page 2 of 5
Common in signal lines and some hybrid power designs.
A GDT ignites into a low-voltage arc under surge stress, then returns to high impedance afterward (with proper circuit design).
Widely used on telecom/data protection; also appears in hybrid power SPD topologies.
GDTs alone may not provide the low Up needed by modern electronics—often paired with MOVs.
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