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EN IEC 61643-332:2024

(Main)

Components for low-voltage surge protection - Part 332: Selection and application principles for metal oxide varistors (MOV)

Components for low-voltage surge protection - Part 332: Selection and application principles for metal oxide varistors (MOV)

IEC 61643-332:2024 describes the theory of operation, principles for the selection and application of MOVs to be connected to power lines or telecommunication or signalling circuits, up to 1 000 V AC or 1 500 V DC. These SPCs are designed to protect apparatus or personnel, or both, from high transient voltages. This document applies to MOVs having two electrodes and voltage dependents elements with or without disconnectors. It does not apply to assemblies that include MOVs and their influence on the MOV's characteristics. This standard specifically discusses the zinc-oxide type of MOVs.

Bauelemente für den Überspannungsschutz bei Niederspannungen - Teil 332: Auswahl- und Anwendungsgrundsätze für Metalloxidvaristoren (MOV)

Composants pour parafoudres basse tension - Partie 332: Choix et principes d'application des varistances à oxyde métallique (MOV)

IEC 61643-332: 2024 décrit la théorie de fonctionnement, ainsi que les principes relatifs au choix et à l'application des varistances à oxyde métallique (MOV, Metal Oxide Varistors) destinées à être connectées à des lignes électriques ou à des circuits de télécommunication ou de signalisation, jusqu'à 1 000 V en courant alternatif ou 1 500 V en courant continu. Ces composants de parafoudres (SPC, Surge Protective Components) sont conçus pour protéger l'appareillage et/ou le personnel contre les hautes tensions transitoires. Le présent document s'applique aux MOV qui possèdent deux électrodes et des éléments variables, avec ou sans déconnecteurs. Il ne s'applique pas aux ensembles qui comportent des MOV ni à leur influence sur les caractéristiques des MOV. La présente norme traite spécifiquement des MOV de type oxyde de zinc.

Sestavni deli za nizkonapetostne naprave za zaščito pred prenapetostnimi udari - 332. del: Izbira in načini uporabe za kovinsko-oksidne varistorje (MOV)

Standard IEC 61643-332:2024 opisuje teorijo delovanja ter načine izbire in uporabe kovinsko-oksidnih varistorjev (MOV), namenjenih priključitvi v električne vode ali telekomunikacijske ali signalne tokokroge z napetostjo do 1000 V pri izmeničnem toku ali 1500 V pri enosmernem toku. Ti sestavni deli za zaščito pred prenapetostnimi udari (SPC) so zasnovani tako, da aparat ali osebje (ali oboje) varujejo pred visokimi prehodnimi napetostmi. Ta dokument se uporablja za kovinsko-oksidne varistorje z dvema elektrodama in napetostno odvisnimi elementi z ločilniki ali brez njih. Ne uporablja se za sklope, ki vključujejo kovinsko-oksidne varistorje, in njihov vpliv na značilnosti varistorjev. Ta standard posebej obravnava kovinsko-oksidne varistorje iz cinkovega oksida.

General Information

Status
Published
Publication Date
23-May-2024
ICS
31.040.20 - Potentiometers, variable resistors
Technical Committee
CLC/SR 37B - Specific components for surge arresters and surge protective devices
Drafting Committee
IEC/SC 37B - IEC_SC_37B
Current Stage
6060 - Document made available - Publishing
Start Date
24-May-2024
Completion Date
24-May-2024
Ref Project
SIST EN IEC 61643-332:2024 - Components for low-voltage surge protection - Part 332: Selection and application principles for metal oxide varistors (MOV)

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SLOVENSKI STANDARD
01-julij-2024
Sestavni deli za nizkonapetostne naprave za zaščito pred prenapetostnimi udari -
332. del: Izbira in načini uporabe za kovinsko-oksidne varistorje (MOV)
Components for low-voltage surge protection - Part 332: Selection and application
principles for metal oxide varistors (MOV)
Bauelemente für den Überspannungsschutz bei Niederspannungen - Teil 332: Auswahl-
und Anwendungsgrundsätze für Metalloxidvaristoren (MOV)
Composants de protection contre les surtensions basse tension - Partie 332 : Principes
de sélection et d'application pour les varistances à oxyde métallique (MOV)
Ta slovenski standard je istoveten z: EN IEC 61643-332:2024
ICS:
29.120.50 Varovalke in druga Fuses and other overcurrent
nadtokovna zaščita protection devices
31.040.20 Potenciometri, spremenljivi Potentiometers, variable
upori resistors
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 61643-332

NORME EUROPÉENNE
EUROPÄISCHE NORM May 2024
ICS 31.040.20
English Version
Components for low-voltage surge protection - Part 332:
Selection and application principles for metal oxide varistors
(MOV)
(IEC 61643-332:2024)
Composants pour parafoudres basse tension - Partie 332: Bauelemente für den Überspannungsschutz bei
Choix et principes d'application des varistances à oxyde Niederspannungen - Teil 332: Auswahl- und
métallique (MOV) Anwendungsgrundsätze für Metalloxidvaristoren (MOV)
(IEC 61643-332:2024) (IEC 61643-332:2024)
This European Standard was approved by CENELEC on 2024-05-22. 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,
Türkiye 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
© 2024 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 61643-332:2024 E

European foreword
The text of document 37B/243/FDIS, future edition 1 of IEC 61643-332, 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 61643-332:2024.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2025-02-22
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2027-05-22
document have to be withdrawn
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.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 61643-332:2024 was approved by CENELEC as a
European Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standard indicated:
IEC 60364-5-51:2005 NOTE Approved as HD 60364-5-51:2009 +A11:2013 +A12:2017
IEC 61000-4-2:2008 NOTE Approved as EN 61000-4-2:2009 (not modified)
IEC 60068-1:2013 NOTE Approved as EN 60068-1:2014 (not modified)
IEC 60068-2-20:2021 NOTE Approved as EN IEC 60068-2-20:2021 (not modified)
IEC 60068-2-21:2021 NOTE Approved as EN IEC 60068-2-21:2021 (not modified)
IEC 60068-2-78:2012 NOTE Approved as EN 60068-2-78:2013 (not modified)
IEC 60721-3-3:2019 NOTE Approved as EN IEC 60721-3-3:2019 (not modified)
IEC 61643-21:2000 NOTE Approved as EN 61643-21:2001 (not modified)
IEC 61643-21:2000/A1:2008 NOTE Approved as EN 61643-21:2001/A1:2009
IEC 61643-21:2000/A2:2012 NOTE Approved as EN 61643-21:2001/A2:2013 (not modified)
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.cencenelec.eu.
Publication Year Title EN/HD Year
IEC 60664-1 2020 Insulation coordination for equipment EN IEC 60664-1 2020
within low-voltage supply systems - Part 1:
Principles, requirements and tests
IEC 61051-1 2018 Varistors for use in electronic equipment - EN IEC 61051-1 2018
Part 1: Generic specification
IEC 61051-2 2021 Varistors for use in electronic equipment - EN IEC 61051-2 2021
Part 2: Sectional specification for surge
suppression varistors
IEC 61643-11 (mod) 2011 Low-voltage surge protective devices - Part EN 61643-11 2012
11: Surge protective devices connected to
low-voltage power systems - Requirements
and test methods
- - + A11 2018
IEC 61643-331 2020 Components for low-voltage surge EN IEC 61643-331 2020
protection - Part 331: Performance
requirements and test methods for metal
oxide varistors (MOV)
IEC 62368-1 2023 Audio/video, information and EN IEC 62368-1 2024
communication technology equipment -
Part 1: Safety requirements
IEC 61643-332 ®
Edition 1.0 2024-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Components for low-voltage surge protection –

Part 332: Selection and application principles for metal oxide varistors (MOV)

Composants pour parafoudres basse tension –

Partie 332: Choix et principes d'application des varistances à oxyde métallique

(MOV)
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 31.040.20  ISBN 978-2-8322-8594-7

– 2 – IEC 61643-332:2024 © IEC 2024
CONTENTS
FOREWORD . 5
1 Scope . 7
2 Normative references . 7
3 Terms, definitions, symbols and abbreviated terms . 7
3.1 Terms and definitions . 8
3.1.1 Ratings . 8
3.1.2 Characteristics. 9
3.2 Symbols and abbreviated terms . 12
3.2.1 Symbols . 12
3.2.2 Abbreviated terms . 13
4 General . 13
5 Construction . 13
6 Function . 14
6.1 Theory of operation . 14
6.2 Thermal protection of MOVs . 15
6.3 Failure modes . 16
6.3.1 General . 16
6.3.2 Short-circuit failure mode . 16
6.3.3 Degradation failure mode . 16
6.3.4 Open-circuit and high clamping voltage failure mode . 17
7 Application . 17
7.1 MOVs basic application . 17
7.1.1 Application circuit . 17
7.1.2 Operational compatibility . 18
7.1.3 Voltage limiting . 18
7.1.4 Selection of MOVs . 18
7.1.5 Mitigating the consequences of failure . 27
7.1.6 Operations to failure . 30
7.1.7 Earthing and bonding . 30
7.1.8 Location of MOVs . 31
7.1.9 Applications for MOVs . 31
7.1.10 Parallel connections . 32
7.1.11 Series connections . 33
7.2 Thermally protected metal oxide varistor . 33
7.2.1 Introduction . 33
7.2.2 Selection of thermally protected MOV . 34
7.2.3 Time to open characteristics . 34
7.3 ESD . 34
7.3.1 Background . 34
7.3.2 Standards . 35
7.3.3 Application example 1 . 35
7.3.4 Application example 2 . 35
7.4 Consideration for TOV . 35
7.4.1 Failure of the low-voltage power supply circuit . 35
7.4.2 Failure of high voltage or medium voltage power supply circuit . 36
8 Safety and hazard information for MOVs. 36

IEC 61643-332:2024 © IEC 2024 – 3 –
8.1 Overview. 36
8.1.1 General . 36
8.1.2 Confirmation of rated performance . 36
8.2 Fire risks . 36
8.2.1 General . 36
8.2.2 Use between lines . 36
8.2.3 Use between line and earth . 37
8.2.4 Shatter-proof .
...

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