IEC 61643-331:2017 PRV 
Pre release version

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


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This Final Draft International Standard is an up to 6 weeks' pre-release of the official publication. It is available for sale during its voting period: 2017-09-22 to 2017-11-03. By purchasing this FDIS now, you will automatically receive, in addition, the final publication.

IEC 61643-331: 2017 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:
- Update of the nominal varistor voltage test method;
- Addition of thermally protected varistors – component symbol and test methods;
- Addition of nominal discharge current – test methods;
- Addition of voltage ratings for disc types (Table 1);
- Addition of test currents for clamping voltage of disc types (Table 2);
- Addition of typical voltage ratings of SMD types (Table 3); and
- Addition of Limited current and temporary overvoltage tests for thermally protected varistors.

Keywords: metal oxide varistors (MOV), high transient voltages.

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Additional information

Publication typeInternational Standard
Publication date2017-09-22
Available language(s)English
TC/SCTC 37/SC 37B - Components for low-voltage surge protectionrss
ICS31.040.20 - Potentiometers, variable resistors
Stability date  2021
File size1435 KB

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