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EVS-EN IEC 61643-331:2018

Components for low-voltage surge protection - Part 331: Performance requirements and test methods for metal oxide varistors (MOV)

General information

Withdrawn from 15.05.2020
Base Documents
IEC 61643-331:2017; EN IEC 61643-331:2018
Directives or regulations
None

Standard history

Status
Date
Type
Name
15.05.2020
Main
02.04.2018
Main
15.12.2003
Main
EVS-EN 61643-331:2003
IEC 61643-331:2017E) is a test specification for metal oxide varistors (MOV), which are used for applications up to 1 000 V AC or 1 500 V DC in power line, or telecommunication, or signalling circuits. They are designed to protect apparatus or personnel, or both, from high transient voltages. This specification applies to MOVs having two electrodes and hybrid overvoltage protection components. This specification also does not apply to mountings and their effect on the MOV’s characteristics. Characteristics given apply solely to the MOV mounted only in the ways described for the tests. This second edition cancels and replaces the first edition published in 2003. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a) Update of the nominal varistor voltage test method;
b) Addition of thermally protected varistors – component symbol and test methods;
c) Addition of nominal discharge current – test methods;
d) Addition of voltage ratings for disc types (Table 1);
e) Addition of test currents for clamping voltage of disc types (Table 2);
f) Addition of typical voltage ratings of SMD types (Table 3); and
g) Addition of Limited current and temporary overvoltage tests for thermally protected varistors.

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