IEC/TR 61643-333 Ed. 1.0 en:2026

Current Revision
Components for low-voltage surge protection - Part 333: characteristic equations and life evaluation for metal oxide varistors (MOV)

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Components for low-voltage surge protection - Part 333: characteristic equations and life evaluation for metal oxide varistors (MOV)

PUBLISH DATE 2026

IEC TR 61643-333:2026 presents the U-I/R-I characteristic equations and the life evaluation method for MOVs, which are used for applications up to 1 000 V AC or 1 500 V DC in power line, telecommunication, or signalling circuits.

They are designed to protect apparatus or personnel, or both, from high transient voltages.

This document specifically addresses the zinc-oxide type of MOVs.

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