• IEC 61643-331:2017

    Superseded A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

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

    Available format(s):  Hardcopy, PDF, PDF 3 Users, PDF 5 Users, PDF 9 Users

    Superseded date:  31-12-2021

    Language(s):  English - French, English

    Published date:  07-12-2017

    Publisher:  International Electrotechnical Committee

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    Table of Contents - (Show below) - (Hide below)

    1 Scope
    2 Normative references
    3 Terms, definitions, symbols and abbreviated
    4 Service conditions
    5 Mechanical requirements and materials
    6 General
    7 Electrical requirements
    8 Standard design test criteria
    9 Nominal discharge current and limited current
      temporary overvoltage
    Annex A (informative) - MOV testing according to
            IEC 61643-11:2011 - Surge protective devices
            for the Class I, II and III
    Annex B (informative) - IEC 61051 Varistors for use
            in electronic equipment
    Annex C (informative) - Accelerated endurance
            screening test
    Annex D (informative) - Proposed test method for
            determination of mean time to failure (MTTF)

    Abstract - (Show below) - (Hide below)

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

    General Product Information - (Show below) - (Hide below)

    Committee TC 37/SC 37B
    Development Note Stability Date: 2019. (12/2017)
    Document Type Standard
    Publisher International Electrotechnical Committee
    Status Superseded
    Superseded By

    Standards Referencing This Book - (Show below) - (Hide below)

    IEC 60068-1:2013 Environmental testing - Part 1: General and guidance
    IEC 60068-2-20:2008 Environmental testing - Part 2-20: Tests - Test T: Test methods for solderability and resistance to soldering heat of devices with leads
    IEC 60068-2-21:2006 Environmental testing - Part 2-21: Tests - Test U: Robustness of terminations and integral mounting devices
    IEC TR 62240-1:2013 Process management for avionics - Electronic components capability in operation - Part 1: Temperature uprating
    IEC 61000-4-2:2008 Electromagnetic compatibility (EMC) - Part 4-2: Testing and measurement techniques - Electrostatic discharge immunity test
    IEC 61051-2:1991 Varistors for use in electronic equipment - Part 2: Sectional specification for surge suppression varistors
    IEC 61643-11:2011 Low-voltage surge protective devices - Part 11: Surge protective devices connected to low-voltage power systems - Requirements and test methods
    IEC 60068-2-29:1987 Environmental testing. Part 2: Tests. Test Eb and guidance: Bump
    IEC 60060-1:2010 High-voltage test techniques - Part 1: General definitions and test requirements
    IEC 60068-2-14:2009 Environmental testing - Part 2-14: Tests - Test N: Change of temperature
    IEC 60068-2-52:2017 Environmental testing - Part 2-52: Tests - Test Kb: Salt mist, cyclic (sodium chloride solution)
    IEC 61051-1:2007 Varistors for use in electronic equipment - Part 1: Generic specification
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