EN IEC 61643-331:2020

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

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

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.

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
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

– 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
V
7.2 Maximum AC (DC) continuous voltage (V / V ) . 13
M(AC) M(DC)
7.3 Standby current (I ) . 13
D
7.4 Capacitance (C ) . 13
V
7.5 Clamping voltage (V ) . 13
C
7.6 Electrostatic discharge (ESD) (for SMD type MOV only). 15
7.7 Rated impulse energy . 15
7.8 Nominal discharge current (I ) . 15
n
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
TM
8.2.2 Next impulse . 16
8.2.3 Maximum Continuous voltage (V ) . 17
M
8.3 Electrical Characteristics . 17
8.3.1 Clamping voltage (V ) . 17
C
8.3.2 Standby current (I ) . 17
D
8.3.3 Varistor voltage (V ) . 17
V
8.3.4 Capacitance (C ) . 18
V
8.3.5 Rated energy . 18
8.4 Varistor Rating Assurance Testing . 18

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
n
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 .
...