10. GDT, Spark Gaps & Hybrid SPDs · Page 3 of 5
Hybrid SPD Topologies
Combine technologies to balance energy and clamping.

Typical idea
A spark gap or GDT handles high energy; an MOV stage shapes the residual voltage.
Benefits
Better endurance at entrances while still achieving useful Up for downstream equipment.
Specification
Ask for the tested Type classification and coordination data, not only a marketing "hybrid" label.
