Surge Protection Device Calculator

Calculate SPD rating, clamping voltage, and protection level for power surge/lightning protection systems.

Nominal system voltage.
V
1=Wye, 2=Delta, 3=Single-phase.
Cat A: outlets, Cat B: panels, Cat C: service entrance.
Available short circuit current at SPD location.
A

Results

Min MCOV Rating-V
Voltage Protection Rating-V
Nominal Discharge Current-kA
Required SCCR-kA
References: IEEE C62.41 — Surge Environment; NEC 285; UL 1449