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

EN-IEC 61643-331 is a test specification for metal oxide varistors (MOV), which are usedfor applications up to 1 000 V AC or 1 500 V DC in power lines, or telecommunication, orsignalling circuits. They are designed to protect apparatus or personnel, or both, from hightransient voltages.This document applies to MOVs having two electrodes and hybrid surge protectioncomponents. This document also does not apply to mountings and their effect on the MOV’scharacteristics. Characteristics given apply solely to the MOV mounted only in the waysdescribed for the tests.

Bauelemente für Überspannungsschutzgeräte für Niederspannung – Teil 331: Leistungsanforderungen und Prüfverfahren für Metalloxidvaristoren (MOV)

Composants pour parafoudres basse tension - Partie 331: Exigences de performance et méthodes d'essai pour les varistances à oxyde métallique (MOV)

IEC 61643-331:2020 est disponible sous forme de IEC 61643-331:2020 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.

Sestavni deli za nizkonapetostne naprave za zaščito pred prenapetostnimi udari - 311. del: Zahteve za lastnosti in preskusne metode za kovinsko-oksidne varistorje (MOV)

General Information

Status
Published
Publication Date
27-May-2020
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
20-May-2020
Due Date
25-Jul-2020
Completion Date
28-May-2020

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SLOVENSKI STANDARD
SIST EN IEC 61643-331:2020
01-julij-2020
Nadomešča:
SIST EN IEC 61643-331:2018
Sestavni deli za nizkonapetostne naprave za zaščito pred prenapetostnimi udari -

311. del: Zahteve za lastnosti in preskusne metode za kovinsko-oksidne varistorje

(MOV)
Components for low-voltage surge protective devices - Part 331: Performance
requirements and test methods for metal oxide varistors (MOV)
Bauelemente für Überspannungsschutzgeräte für Niederspannung – Teil 331:
Leistungsanforderungen und Prüfverfahren für Metalloxidvaristoren (MOV)

Composants pour parafoudres basse tension - Partie 331: Exigences de performance et

méthodes d'essai pour les varistances à oxyde métallique (MOV)
Ta slovenski standard je istoveten z: EN IEC 61643-331:2020
ICS:
29.120.50 Varovalke in druga Fuses and other overcurrent
nadtokovna zaščita protection devices
31.040.20 Potenciometri, spremenljivi Potentiometers, variable
upori resistors
SIST EN IEC 61643-331:2020 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN IEC 61643-331:2020
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SIST EN IEC 61643-331:2020
EUROPEAN STANDARD EN IEC 61643-331
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2020
ICS 31.040 Supersedes EN IEC 61643-331:2018 and all of its
amendments and corrigenda (if any)
English Version
Components for low-voltage surge protection - Part 331:
Performance requirements and test methods for metal oxide
varistors (MOV)
(IEC 61643-331:2020)

Composants pour parafoudres basse tension - Partie 331: Bauelemente für Überspannungsschutzgeräte für

Exigences de performance et méthodes d'essai pour les Niederspannung - Teil 331: Leistungsanforderungen und

varistances à oxyde métallique (MOV) Prüfverfahren für Metalloxidvaristoren (MOV)

(IEC 61643-331:2020) (IEC 61643-331:2020)

This European Standard was approved by CENELEC on 2020-04-23. CENELEC members are bound to comply with the CEN/CENELEC

Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC

Management Centre or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation

under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the

same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,

Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the

Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2020 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN IEC 61643-331:2020 E
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SIST EN IEC 61643-331:2020
EN IEC 61643-331:2020 (E)
European foreword

The text of document 37B/211/FDIS, future edition 3 of IEC 61643-331, prepared by SC 37B

"Components for low-voltage surge protection" of IEC/TC 37 "Surge arresters" was submitted to the

IEC-CENELEC parallel vote and approved by CENELEC as EN IEC 61643-331:2020.
The following dates are fixed:

• latest date by which the document has to be implemented at national (dop) 2021-01-23

level by publication of an identical national standard or by endorsement

• latest date by which the national standards conflicting with the (dow) 2023-04-23

document have to be withdrawn

This document supersedes EN IEC 61643-331:2018 and all of its amendments and corrigenda (if

any).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Endorsement notice

The text of the International Standard IEC 61643-331:2020 was approved by CENELEC as a

European Standard without any modification.
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SIST EN IEC 61643-331:2020
EN IEC 61643-331:2020 (E)
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments)

applies.

NOTE 1 Where an International Publication has been modified by common modifications, indicated by (mod), the relevant

EN/HD applies.

NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here:

www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60068-1 2013 Environmental testing - Part 1: General EN 60068-1 2014
and guidance
IEC 60068-2-6 2007 Environmental testing - Part 2-6: Tests - EN 60068-2-6 2008
Test Fc: Vibration (sinusoidal)

IEC 60068-2-14 2009 Environmental testing - Part 2-14: Tests - EN 60068-2-14 2009

Test N: Change of temperature

IEC 60068-2-20 2008 Environmental testing - Part 2-20: Tests - EN 60068-2-20 2008

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 - EN 60068-2-21 2006

Test U: Robustness of terminations and
integral mounting devices

IEC 60068-2-27 2008 Environmental testing - Part 2-27: Tests - EN 60068-2-27 2009

Test Ea and guidance: Shock

IEC 60068-2-52 2017 Environmental testing - Part 2-52: Tests - EN IEC 60068-2-52 2018

Test Kb: Salt mist, cyclic (sodium chloride
solution)
IEC 61000-4-2 2008 Electromagnetic compatibility (EMC) - EN 61000-4-2 2009
Part 4-2: Testing and measurement
techniques - Electrostatic discharge
immunity test
IEC 61643-11 (mod) 2011 Low-voltage surge protective devices - EN 61643-11 2012
Part 11: Surge protective devices
connected to low-voltage power systems
- Requirements and test methods
+ A11 2018
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SIST EN IEC 61643-331:2020
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SIST EN IEC 61643-331:2020
IEC 61643-331
Edition 3.0 2020-03
INTERNATIONAL
STANDARD
colour
inside
Components for low-voltage surge protection –
Part 331: Performance requirements and test methods for metal oxide varistors
(MOV)
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 31.040.20 ISBN 978-2-8322-7905-2

Warning! Make sure that you obtained this publication from an authorized distributor.

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 7 ----------------------
SIST EN IEC 61643-331:2020
– 2 – IEC 61643-331:2020 © IEC 2020
CONTENTS

FOREWORD ........................................................................................................................... 5

1 Scope .............................................................................................................................. 7

2 Normative references ...................................................................................................... 7

3 Terms, definitions, symbols and abbreviated terms .......................................................... 8

3.1 Terms and definitions .............................................................................................. 8

3.1.1 Ratings ............................................................................................................ 8

3.1.2 Characteristics................................................................................................. 9

3.2 Symbols and abbreviated terms used in this document ......................................... 11

3.2.1 Symbols ........................................................................................................ 11

3.2.2 Abbreviated terms ......................................................................................... 11

4 Service conditions ......................................................................................................... 12

4.1 Operating and storage temperature ranges ........................................................... 12

4.2 Altitude or atmospheric pressure range ................................................................. 12

4.3 Relative Humidity .................................................................................................. 12

5 Mechanical requirements and materials ......................................................................... 12

5.1 Robustness of terminations ................................................................................... 12

5.2 Solderability .......................................................................................................... 12

5.3 Marking ................................................................................................................. 12

6 General ......................................................................................................................... 13

6.1 Failure rates ......................................................................................................... 13

6.2 Test standard atmospheric conditions ................................................................... 13

7 Electrical requirements .................................................................................................. 13

7.1 Varistor voltage (V ) ............................................................................................. 13

7.2 Maximum AC (DC) continuous voltage (V / V ) ....................................... 13

M(AC) M(DC)

7.3 Standby current (I ) .............................................................................................. 13

7.4 Capacitance (C ) .................................................................................................. 13

7.5 Clamping voltage (V ) ........................................................................................... 13

7.6 Electrostatic discharge (ESD) (for SMD type MOV only)........................................ 15

7.7 Rated impulse energy ........................................................................................... 15

7.8 Nominal discharge current (I ) .............................................................................. 15

7.9 Endurance ............................................................................................................ 15

7.10 Limited current temporary overvoltage .................................................................. 15

8 Standard design test criteria .......................................................................................... 16

8.1 General ................................................................................................................. 16

8.2 Ratings ................................................................................................................. 16

8.2.1 Single-impulse maximum current (I ) ........................................................... 16

8.2.2 Next impulse .................................................................................................. 16

8.2.3 Maximum Continuous voltage (V ) ................................................................ 17

8.3 Electrical Characteristics ...................................................................................... 17

8.3.1 Clamping voltage (V ) ................................................................................... 17

8.3.2 Standby current (I ) ...................................................................................... 17

8.3.3 Varistor voltage (V ) ...................................................................................... 17

8.3.4 Capacitance (C ) ........................................................................................... 18

8.3.5 Rated energy ................................................................................................. 18

8.4 Varistor Rating Assurance Testing ........................................................................ 18

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SIST EN IEC 61643-331:2020
IEC 61643-331:2020 © IEC 2020 – 3 –

8.5 ESD test ............................................................................................................... 19

9 Nominal discharge current and limited current temporary overvoltage............................ 19

9.1 Thermally protected varistors – Sequence of tests ................................................ 19

9.2 Temperature and humidity cycle conditioning ........................................................ 19

9.3 Nominal discharge current (I ) test description ..................................................... 20

9.3.1 General ......................................................................................................... 20

9.3.2 Pass/fail criteria ............................................................................................. 22

9.4 Limited current temporary overvoltage test description and procedure for

thermally protected varistors ................................................................................. 22

9.4.1 General ......................................................................................................... 22

9.4.2 Sample preparation ....................................................................................... 23

9.4.3 Test conditions .............................................................................................. 23

9.4.4 Pass/fail criteria ............................................................................................. 23

9.5 Dielectric testing ................................................................................................... 24

9.5.1 Test conditions for thermally protected MOV .................................................. 24

9.5.2 Setup from foil to leads .................................................................................. 25

9.5.3 Pass criteria .................................................................................................. 25

9.6 Insulation Resistance ............................................................................................ 25

Annex A (informative) MOV testing according to the IEC 61643-11:2011 Surge

protective devices for the Class I, II and III ........................................................................... 26

A.1 General ................................................................................................................. 26

A.2 MOV selection ...................................................................................................... 26

A.3 Cross reference list of abbreviations, descriptions and definitions ......................... 26

A.4 Operating duty test ............................................................................................... 27

A.4.1 General ......................................................................................................... 27

A.4.2 Class I and II operating duty tests (8.4.4.3) ................................................... 32

A.4.3 Additional duty test for test class I ................................................................. 33

A.4.4 Class III operating duty tests ......................................................................... 33

A.4.5 Pass criteria for all operating duty tests and for the additional duty test

for test class I ................................................................................................ 34

A.4.6 Preferred parameters of impulse discharge current I used for Class I
imp

additional duty tests ....................................................................................... 34

A.4.7 Preferred values of impulse discharge current I used for Class I and

Class II residual voltage and operating duty tests .......................................... 35

A.4.8 Preferred values of combination generator waveshape used for Class III

tests .............................................................................................................. 35

Annex B (informative) IEC 61051 Varistors for use in electronic equipment ......................... 38

Annex C (normative) Accelerated Endurance screening test ................................................ 39

C.1 Accelerated endurance screening test .................................................................. 39

C.2 Preparation of sample ........................................................................................... 39

C.3 Test conditions ..................................................................................................... 39

C.4 Refer to test circuit diagram as shown in Figure C.1. ............................................ 39

C.5 Pass criteria .......................................................................................................... 40

Annex D (informative) Proposed test method of MTTF – Mean time to failure (MTTF) .......... 41

D.1 Sampling plans ..................................................................................................... 41

D.2 Total test hours ..................................................................................................... 41

D.3 Samples................................................................................................................ 41

D.4 Test set-up ........................................................................................................... 42

D.5 Intermediate measurements .................................................................................. 42

D.6 Failure criteria ....................................................................................................... 42

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SIST EN IEC 61643-331:2020
– 4 – IEC 61643-331:2020 © IEC 2020

D.7 Acceptance criteria ............................................................................................... 42

Figure 1 – V-I characteristic of an MOV ................................................................................ 10

Figure 2 – Symbol for MOV ................................................................................................... 11

Figure 3 – Symbol for thermally protected MOV .................................................................... 11

Figure 4 – Test circuit for single-impulse maximum current ................................................... 16

Figure 5 – Test circuit for measuring standby current ............................................................ 17

Figure 6 – Test circuit for measuring varistor voltage (V ) .................................................... 18

Figure 7 – Varistor rating assurance test setup ..................................................................... 19

Figure 8 – Nominal discharge current test flowchart .............................................................. 21

Figure 9 – Sequence of the I Test ....................................................................................... 22

Figure 10 – Temporary overvoltage limited current test procedure flowchart ......................... 24

Figure A.1 – Flow chart of the operating duty test ................................................................. 28

Figure A.2 – Test set-up for operating duty test .................................................................... 29

Figure A.3 – Flow chart of testing to determine the measured limiting voltage ....................... 31

Figure A.4 – Operating duty test timing diagram for test classes I and II ............................... 32

Figure A.5 – Additional duty test timing diagram for test class I ............................................ 33

Figure A.6 – Operating duty test timing diagram for test class III ........................................... 34

Figure C.1 – Circuit of accelerated ageing test ...................................................................... 39

Figure D.1 – Test Circuit of MTTF ......................................................................................... 42

Table 1 – Typical Voltage ratings for disc types .................................................................... 14

Table 2 – Typical Voltage Ratings for SMD types .................................................................. 15

Table 3 – Test voltages for dielectric strength Between Test voltage .................................... 25

Table A.1 – Abbreviations, descriptions and definitions ......................................................... 27

Table A.2 – Preferred parameters for class I test .................................................................. 34

Table A.3 – Preferred values for class I and class II tests ..................................................... 35

Table A.4 – Preferred values for class III tests ...................................................................... 36

Table C.1 – Current in V measurement ................................................................................ 39

Table D.1 – Sampling plans .................................................................................................. 41

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SIST EN IEC 61643-331:2020
IEC 61643-331:2020 © IEC 2020 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
COMPONENTS FOR LOW-VOLTAGE SURGE PROTECTION –
Part 331: Performance requirements and test methods
for metal oxide varistors (MOV)
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote

international co-operation on all questions concerning standardization in the electrical and electronic fields. To

this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,

Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC

Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested

in the subject dealt with may participate in this preparatory work. International, governmental and non-

governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely

with the International Organization for Standardization (ISO) in accordance with conditions determined by

agreement between the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

consensus of opinion on the relevant subjects since each technical committee has representation from all

interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

misinterpretation by any end user.

4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

transparently to the maximum extent possible in their national and regional publications. Any divergence

between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in

the latter.

5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity

assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

services carried out by independent certification bodies.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

members of its technical committees and IEC National Committees for any personal injury, property damage or

other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC

Publications.

8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of

patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 61643-331 has been prepared by subcommittee 37B: Components

for low-voltage surge protection, of IEC technical committee 37: Surge arresters.

This third edition cancels and replaces the second edition published in 2017. This edition

constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:
a) a Varistor MCOV rating assurance test;
b) an energy rating test (2ms);
c) revised Dielectric strength and insulation resistance tests.
---------------------- Page: 11 ----------------------
SIST EN IEC 61643-331:2020
– 6 – IEC 61643-331:2020 © IEC 2020
The text of this International Standard is based on the following documents:
FDIS Report on voting
37B/211/FDIS 37B/214/RVD

Full information on the voting for the approval of this International Standard can be found in

the report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

A list of all parts of IEC 61643 series, under the general title Components for low-voltage

surge protective devices, can be found on the IEC website.

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to

the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates

that it contains colours which are considered to be useful for the correct

understanding of its contents. Users should therefore print this document using a

colour printer.
---------------------- Page: 12 ----------------------
SIST EN IEC 61643-331:2020
IEC 61643-331:2020 © IEC 2020 – 7 –
COMPONENTS FOR LOW-VOLTAGE SURGE PROTECTION –
Part 331: Performance requirements and test methods
for metal oxide varistors (MOV)
1 Scope

This part of IEC 61643 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 lines, or telecommunication, or

signalling circuits. They are designed to protect apparatus or personnel, or both, from high

transient voltages.
This document applies to MOVs having two electrodes and hybrid surge protection

components. This document 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.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their

content constitutes requirements of this document. For dated references, only the edition

cited applies. For undated references, the latest edition of the referenced document (including

any amendments) applies.
IEC 60068-1:2013, Environmental testing – Part 1: General and guidance

IEC 60068-2-6:2007, Environmental testing – Part 2-6: Tests – Test Fc: Vibration (sinusoidal)

IEC 60068-2-14:2009, Environmental testing – Part 2-14: Tests – Test N: Change of

temperature

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 60068-2-27:2008, Environmental testing – Part 2-27: Tests – Test Ea and guidance:

Shock

IEC 60068-2-52:2017 Environmental testing – Part 2-52: Tests – Test Kb: Salt mist, cyclic

(sodium chloride solution)

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 61000-4-2:2008, Electromagnetic compatibility (EMC) – Part 4-2: Testing and
measurement techniqu
...

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