Learning path
From lightning concepts to low-voltage power-line SPD products—a structured guide for engineers, panel builders, and local partners.
12. Multi-Stage SPD Coordination · Page 1 of 5
Uncoordinated stages can leave the wrong SPD absorbing the energy.
If a downstream SPD has a lower sparkover / clamping threshold and there is little impedance between stages, it may operate first and fail prematurely.
Upstream device handles bulk energy; downstream device reduces residual voltage.
Cable length between boards, deliberate decoupling inductance, and manufacturer coordination charts.
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