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

Components for low-voltage surge protection - Part 333: characteristic equations and life evaluation for metal oxide varistors (MOV)
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IEC/TR 61643-333 Ed. 1.0 en:2026

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 Ed. 1.0 en: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.

SDO IEC: International Electrotechnical Commission
Document Number IEC/TR 61643
Publication Date June 1, 2026
Language en - English
Page Count 44
Revision Level 1.0
Supercedes
Committee 37B
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