EN IEC 61051-2:2021
(Main)Varistors for use in electronic equipment - Part 2: Sectional specification for surge suppression varistors
Varistors for use in electronic equipment - Part 2: Sectional specification for surge suppression varistors
This part of IEC 61051 is a sectional specification and is applicable to metal oxide varistors with symmetrical voltage-current characteristics for use in electronic equipment connected to any AC or DC supply system. These varistors are designed to protect electronic and other sensitive equipment from high transient surges. Varistors under the scope of this sectional specification are not intended to give primary protection against lightning surges. These varistors have metallic connections and are intended to be mounted as through hole component or directly on to printed boards. The object of this document is to prescribe preferred ratings and characteristics and to select from IEC 61051-1 the appropriate quality assessment procedures, tests and measuring methods, and to give general performance requirements for this type of varistors. Test severities and requirements prescribed in detail specifications referring to this sectional specification should be of equal or higher performance level, because lower performance levels are not permitted.
Varistoren zur Verwendung in Geräten der Elektronik – Teil 2: Rahmenspezifikation für Varistoren für den Überspannungsschutz
Varistances utilisées dans les équipements électroniques - Partie 2: Spécification intermédiaire pour varistances pour limitations de surtensions transitoires
L’IEC 61051-2:2021 est une spécification intermédiaire applicable aux varistances à oxyde métallique présentant des caractéristiques de tension-courant symétriques, destinées à être utilisées dans les équipements électroniques reliés à un système d’alimentation en courant alternatif ou continu. Ces varistances sont conçues pour protéger les équipements électroniques et autres équipements sensibles contre les surtensions transitoires. Les varistances relevant du domaine d’application de la présente spécification intermédiaire ne sont pas destinées à assurer la protection primaire contre la foudre. Ces varistances disposent de connexions métalliques et sont destinées à être montées en tant que composant à trous traversants ou directement sur les cartes imprimées. Le présent document a pour but de prescrire les caractéristiques assignées et les caractéristiques préférentielles, de choisir dans l’IEC 61051-1 les procédures d’assurance de la qualité et les méthodes d’essai et de mesure appropriées, et de fixer les exigences de performance générales pour ce type de varistances. Cette édition inclut les modifications techniques majeures suivantes par rapport à l’édition précédente: a) révision de la structure conformément aux Directives ISO/IEC, Partie 2, dans la mesure du possible, et harmonisation avec l’IEC 61051-1:2018; b) ajout de l’Annexe X à des fins de comparaison avec l’édition précédente; c) ajout de deux listes de caractéristiques assignées de tension préférentielles pour les varistances de type disque et de type CMS; d) nombre admissible d’éléments non conformes fixé à zéro (zéro défaut) dans le programme d’essai en 8.4.3.
Varistorji za elektronsko opremo - 2. del: Področna specifikacija za varistorske prenapetostne odvodnike (IEC 61051-2:2021)
Ta del standarda IEC 61051 je področna specifikacija in se uporablja za kovinsko-oksidne varistorje s simetričnimi značilnostmi napetostnega toka za uporabo v elektronski opremi, ki je priključena na kateri koli enosmerni ali izmenični napajalni sistem.
Ti varistorji so zasnovani za zaščito elektronske in druge občutljive opreme pred visoko prehodno prenapetostjo. Varistorji, ki spadajo na področje uporabe te področne specifikacije, ne zagotavljajo primarne zaščite pred udari strele.
Ti varistorji imajo kovinske povezave in so namenjeni za namestitev kot vtična komponenta ali neposredno na tiskano vezje.
Cilj tega dokumenta je predpisati prednostne vrednosti in lastnosti, izbrati primerne postopke za ovrednotenje kakovosti, preskuse in merilne metode iz standarda IEC 61051-1 ter podati splošne zahteve glede zmogljivosti za ta tip varistorjev. Preskusne stopnje in zahteve, predpisane v podrobnih specifikacijah, ki se navezujejo na to področno specifikacijo, morajo biti enake ali višje ravni učinkovitosti, kajti nižje ravni niso dovoljene.
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-februar-2022
Varistorji za elektronsko opremo - 2. del: Področna specifikacija za varistorske
prenapetostne odvodnike (IEC 61051-2:2021)
Varistors for use in electronic equipment - Part 2: Sectional specification for surge
suppression varistors (IEC 61051-2:2021)
Varistoren zur Verwendung in Geräten der Elektronik – Teil 2: Rahmenspezifikation für
Varistoren für den Überspannungsschutz (IEC 61051-2:2021)
Varistances utilisées dans les équipements électroniques - Partie 2: Spécification
intermédiaire pour varistances pour limitations de surtensions transitoires (IEC 61051-
2:2021)
Ta slovenski standard je istoveten z: EN IEC 61051-2:2021
ICS:
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 61051-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2021
ICS 31.040.20
English Version
Varistors for use in electronic equipment - Part 2: Sectional
specification for surge suppression varistors
(IEC 61051-2:2021)
Varistances utilisées dans les équipements électroniques - Varistoren zur Verwendung in Geräten der Elektronik - Teil
Partie 2: Spécification intermédiaire pour varistances pour 2: Rahmenspezifikation für Varistoren für den
limitations de surtensions transitoires Überspannungsschutz
(IEC 61051-2:2021) (IEC 61051-2:2021)
This European Standard was approved by CENELEC on 2021-12-13. 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
© 2021 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 61051-2:2021 E
European foreword
The text of document 40/2877/FDIS, future edition 2 of IEC 61051-2, prepared by IEC/TC 40
“Capacitors and resistors for electronic equipment” was submitted to the IEC-CENELEC parallel vote
and approved by CENELEC as EN IEC 61051-2:2021.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2022–09–13
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2024–12–13
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 61051-2:2021 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 60062 - Marking codes for resistors and capacitors EN 60062 -
IEC 60068-1 - Environmental testing - Part 1: General EN 60068-1 -
and guidance
IEC 60068-2-1 - Environmental testing - Part 2–1: Tests - EN 60068-2-1 -
Test A: Cold
IEC 60068-2-2 - Environmental testing - Part 2–2: Tests - EN 60068-2-2 -
Test B: Dry heat
IEC 60068-2-6 - Environmental testing - Part 2–6: Tests - EN 60068-2-6 -
Test Fc: Vibration (sinusoidal)
IEC 60068-2-20 - Environmental testing - Part 2–20: Tests - EN IEC 60068-2-20 -
Test Ta and Tb: Test methods for
solderability and resistance to soldering
heat of devices with leads
IEC 60068-2-27 - Environmental testing - Part 2–27: Tests - EN 60068-2-27 -
Test Ea and guidance: Shock
IEC 60068-2-30 - Environmental testing - Part 2–30: Tests - EN 60068-2-30 -
Test Db: Damp heat, cyclic (12 h + 12 h
cycle)
IEC 60068-2-45 - Basic environmental testing procedures - EN 60068-2-45 -
Part 2–45: Tests - Test XA and guidance:
Immersion in cleaning solvents
IEC 60695-11-5 - Fire hazard testing - Part 11–5: Test EN 60695-11-5 -
flames - Needle-flame test method -
Apparatus, confirmatory test arrangement
and guidance
IEC 61051-1 2018 Varistors for use in electronic equipment - EN IEC 61051-1 2018
Part 1: Generic specification
IEC 61051-2-2 - Varistors for use in electronic equipment - - -
Part 2: Blank detail specification for zinc
oxide surge suppression varistors.
Assessment level E
IEC 61193-2 2007 Quality assessment systems - Part 2: EN 61193-2 2007
Selection and use of sampling plans for
inspection of electronic components and
packages
IEC 61051-2 ®
Edition 2.0 2021-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Varistors for use in electronic equipment –
Part 2: Sectional specification for surge suppression varistors
Varistances utilisées dans les équipements électroniques –
Partie 2: Spécification intermédiaire pour varistances pour limitations de
surtensions transitoires
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 31.040.20 ISBN 978-2-8322-1045-7
– 2 – IEC 61051-2:2021 © IEC 2021
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Preferred characteristics . 7
4.1 Climatic categories . 7
4.2 Voltage ratings . 7
4.3 Derating for metal oxide varistors. 9
4.3.1 General . 9
4.3.2 Derating at increased operating temperatures . 9
4.3.3 Maximum peak current derating characteristic . 10
5 Test procedures, test severities and performance requirements . 11
5.1 General . 11
5.2 Visual examination and check of dimensions . 11
5.3 Electrical tests . 11
5.3.1 Varistor voltage . 11
5.3.2 Leakage current . 11
5.3.3 Capacitance . 11
5.3.4 Voltage proof . 11
5.3.5 Clamping voltage . 11
5.3.6 Maximum peak current . 11
5.3.7 Rated energy . 11
5.4 Soldering test. 12
5.4.1 Resistance to soldering heat . 12
5.4.2 Solderability. 12
5.5 Temperature and climate test . 12
5.5.1 Damp heat, steady state . 12
5.5.2 Endurance at upper category temperature . 12
5.5.3 Rapid change of temperature . 12
5.5.4 Climatic sequence . 12
5.6 Robustness test . 12
5.6.1 Robustness of terminations . 12
5.6.2 Shock testing . 12
5.6.3 Vibration . 13
5.6.4 Solvent resistance of marking . 13
5.7 Fire hazard (Needle flame test) . 13
6 Marking, packaging and ordering information . 13
7 Detail specifications . 13
7.1 General . 13
7.2 Outline drawing and dimensions . 13
7.3 Mounting . 14
7.4 Ratings and characteristics . 14
7.5 Marking . 14
7.6 Ordering information . 14
8 Quality assessment procedure . 14
8.1 General . 14
IEC 61051-2:2021 © IEC 2021 – 3 –
8.2 Primary stage of manufacturer . 14
8.3 Structurally similar components . 14
8.4 Qualification approval (QA) . 15
8.4.1 Qualification approval (QA) procedures . 15
8.4.2 Fixed sample size procedure . 15
8.4.3 Test schedule . 15
8.5 Quality conformance inspection . 19
8.5.1 General . 19
8.5.2 Formation of inspection lots . 19
8.5.3 Test schedule .
...
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