IEC 61051-2:1991/AMD1:2009
(Amendment)Amendment 1 - Varistors for use in electronic equipment - Part 2: Sectional specification for surge suppression varistors
Amendment 1 - Varistors for use in electronic equipment - Part 2: Sectional specification for surge suppression varistors
Amendement 1 - Varistances utilisées dans les équipements électroniques - Partie 2: Spécification intermédiaire pour varistances pour limitations de surtensions transitoires
General Information
- Status
- Published
- Publication Date
- 25-May-2009
- Technical Committee
- TC 40 - Capacitors and resistors for electronic equipment
- Drafting Committee
- WG 43 - TC 40/WG 43
- Current Stage
- DELPUB - Deleted Publication
- Start Date
- 08-Nov-2021
- Completion Date
- 26-Oct-2025
Relations
- Effective Date
- 05-Sep-2023
Overview
IEC 61051-2:1991/AMD1:2009 is the Amendment 1 to the IEC 61051-2 standard titled "Varistors for use in electronic equipment – Part 2: Sectional specification for surge suppression varistors." Published by the International Electrotechnical Commission (IEC), this amendment updates the sectional requirements and testing methods for surge suppression varistors, which are critical components for protecting electronic equipment from transient overvoltages. The standard falls under the technical committee 40, focusing on capacitors and resistors for electronic equipment.
This internationally recognized standard provides detailed technical specifications, testing procedures, and performance criteria for varistors designed to absorb and limit surge voltages, ensuring enhanced reliability and safety of electronic systems. It also references related standards such as IEC 60664-1 for insulation coordination and IEC 60060 for high-voltage test techniques.
Key Topics
- Surge Suppression Varistors: Varistors specified in this document are designed to protect electronic circuits by clamping transient voltage surges, absorbing high-energy pulses to prevent damage.
- Combination Pulse Testing: The amendment introduces detailed specifications on combination pulse tests used to verify varistor performance under realistic surge conditions. These tests simulate the effect of voltage surges combining different pulse shapes to ensure reliability.
- Testing Procedures: The standard covers rigorous testing, including pulse current tests and combination pulse tests (considered alternatives), visual examinations, leakage current or voltage measurements, and voltage proofs for insulated varistors.
- Tolerance and Mounting: Procedures define acceptable deviations in voltage and current waveform parameters during tests, emphasizing mounting techniques that minimize corrosion and self-heating effects to ensure accurate and repeatable results.
- Installation and Usage Conditions: Varistor requirements are aligned with overvoltage categories I, II, and III as per IEC 60664-1, covering diverse applications from low-voltage to industrial electronic equipment environments.
Applications
IEC 61051-2:2009 Amendment 1 standard is essential for manufacturers, testers, and designers of surge protective devices and electronic components. Key applications include:
- Electronic Equipment Protection: Offering guidelines to manufacture varistors that safeguard sensitive electronic devices from lightning strikes, switching surges, and other transient overvoltages.
- Power Supply Systems: Used in power supply networks to enhance insulation coordination and ensure protection against sudden voltage spikes.
- Industrial Controls and Consumer Electronics: Facilitates the design of robust surge suppression systems for industrial machinery, household appliances, and communication devices.
- Quality Assurance: Provides test methods that help manufacturers guarantee product safety, durability, and compliance for global markets.
By adhering to this standard, companies can assure compliance with international safety and performance norms, reduce equipment downtime, and extend the service life of electronic systems exposed to overvoltage stresses.
Related Standards
- IEC 61051-1:2007 – Varistors for use in electronic equipment – Part 1: Generic Specification
- IEC 60664-1:1992 – Insulation coordination for equipment within low-voltage systems – Part 1: Principles, requirements, and tests
- IEC 60060 (all parts) – High-voltage test techniques
These complementary standards support the comprehensive design, testing, and certification of varistors and related surge suppression components under varying electrical and environmental conditions.
Practical Value
IEC 61051-2 Amendment 1 ensures that surge suppression varistors meet stringent international requirements for performance and reliability. Electrical engineers, electronics manufacturers, and quality assurance professionals benefit from clearly defined test parameters and detailed guidance on the selection, application, and validation of varistors for transient voltage protection. This improves electronic equipment resilience, reduces field failures, and aligns products with global market expectations.
For more information, refer to the IEC Webstore or contact IEC through their official website at www.iec.ch. Stay updated on standard revisions and access a broad catalogue of international electrotechnical publications.
Frequently Asked Questions
IEC 61051-2:1991/AMD1:2009 is a standard published by the International Electrotechnical Commission (IEC). Its full title is "Amendment 1 - Varistors for use in electronic equipment - Part 2: Sectional specification for surge suppression varistors". This standard covers: Amendment 1 - Varistors for use in electronic equipment - Part 2: Sectional specification for surge suppression varistors
Amendment 1 - Varistors for use in electronic equipment - Part 2: Sectional specification for surge suppression varistors
IEC 61051-2:1991/AMD1:2009 is classified under the following ICS (International Classification for Standards) categories: 31.040.20 - Potentiometers, variable resistors. The ICS classification helps identify the subject area and facilitates finding related standards.
IEC 61051-2:1991/AMD1:2009 has the following relationships with other standards: It is inter standard links to IEC 61051-2:2021. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
IEC 61051-2:1991/AMD1:2009 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
IEC 61051-2 ®
Edition 1.0 2009-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AMENDMENT 1
AMENDEMENT 1
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
IEC 61051-2:1991/A1:2009
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by
any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either IEC or
IEC's member National Committee in the country of the requester.
If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,
please contact the address below or your local IEC member National Committee for further information.
Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite
ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie
et les microfilms, sans l'accord écrit de la CEI ou du Comité national de la CEI du pays du demandeur.
Si vous avez des questions sur le copyright de la CEI ou si vous désirez obtenir des droits supplémentaires sur cette
publication, utilisez les coordonnées ci-après ou contactez le Comité national de la CEI de votre pays de résidence.
IEC Central Office
3, rue de Varembé
CH-1211 Geneva 20
Switzerland
Email: inmail@iec.ch
Web: www.iec.ch
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.
ƒ Catalogue of IEC publications: www.iec.ch/searchpub
The IEC on-line Catalogue enables you to search by a variety of criteria (reference number, text, technical committee,…).
It also gives information on projects, withdrawn and replaced publications.
ƒ IEC Just Published: www.iec.ch/online_news/justpub
Stay up to date on all new IEC publications. Just Published details twice a month all new publications released. Available
on-line and also by email.
ƒ Electropedia: www.electropedia.org
The world's leading online dictionary of electronic and electrical terms containing more than 20 000 terms and definitions
in English and French, with equivalent terms in additional languages. Also known as the International Electrotechnical
Vocabulary online.
ƒ Customer Service Centre: www.iec.ch/webstore/custserv
If you wish to give us your feedback on this publication or need further assistance, please visit the Customer Service
Centre FAQ or contact us:
Email: csc@iec.ch
Tel.: +41 22 919 02 11
Fax: +41 22 919 03 00
A propos de la CEI
La Commission Electrotechnique Internationale (CEI) est la première organisation mondiale qui élabore et publie des
normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.
A propos des publications CEI
Le contenu technique des publications de la CEI est constamment revu. Veuillez vous assurer que vous possédez
l’édition la plus récente, un corrigendum ou amendement peut avoir été publié.
ƒ Catalogue des publications de la CEI: www.iec.ch/searchpub/cur_fut-f.htm
Le Catalogue en-ligne de la CEI vous permet d’effectuer des recherches en utilisant différents critères (numéro de référence,
texte, comité d’études,…). Il donne aussi des informations sur les projets et les publications retirées ou remplacées.
ƒ Just Published CEI: www.iec.ch/online_news/justpub
Restez informé sur les nouvelles publications de la CEI. Just Published détaille deux fois par mois les nouvelles
publications parues. Disponible en-ligne et aussi par email.
ƒ Electropedia: www.electropedia.org
Le premier dictionnaire en ligne au monde de termes électroniques et électriques. Il contient plus de 20 000 termes et
définitions en anglais et en français, ainsi que les termes équivalents dans les langues additionnelles. Egalement appelé
Vocabulaire Electrotechnique International en ligne.
ƒ Service Clients: www.iec.ch/webstore/custserv/custserv_entry-f.htm
Si vous désirez nous donner des commentaires sur cette publication ou si vous avez des questions, visitez le FAQ du
Service clients ou contactez-nous:
Email: csc@iec.ch
Tél.: +41 22 919 02 11
Fax: +41 22 919 03 00
IEC 61051-2 ®
Edition 1.0 2009-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AMENDMENT 1
AMENDEMENT 1
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
PRICE CODE
INTERNATIONALE
E
CODE PRIX
ICS 31.040.20 ISBN 978-2-88910-402-4
– 2 – 61051-2 Amend. 1 © IEC:2009
FOREWORD
This amendment has been prepared by IEC technical committee 40: Capacitors and resitors
for electronic equipment.
The text of this amendment is based on the following documents:
CDV Report on voting
40/1931/CDV 40/1974/RVC
Full information on the voting for the approval of this amendment can be found in the report
on voting indicated in the above table.
The committee has decided that the contents of this amendment and the base publication will
remain unchanged until the maintenance result date indicated on the IEC web site under
"http://webstore.iec.ch" in the data related to the specific publication. At this date, the
publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
_____________
1.3 Related documents
Add the following new reference:
IEC 60664-1:1992, Insulation coordination for equipment within low-voltage systems – Part 1:
Principles, requirements and tests
Add, after subclause 2.3.5, the following new subclause:
2.3.6 Combination pulse
Annex A, with the following details which depend on the installation condition of the apparatus,
in which the varistors are used (see IEC 60664-1, 2.2.2).
Combination pulse
Voltage line to neutral derived from nominal voltage a.c. or d.c. up to and
(based on overvoltage
including
category I, II and III of
IEC 60664-1)
I II III
1,5 kV / 2,5 kV / 4,0 kV /
300 V
0,75 kA 1,25 kA 2,0 kA
2,5 kV / 4,0 kV / 6,0 kV /
600 V
1,25 kA 2,0 kA 3,0 kA
61051-2 Amend. 1 © IEC:2009 – 3 –
3.2.2 Tests
Add, after Notes 1 to 3 the following new Note 4:
NOTE 4 The pulse current test and the combination pulse test are considered to be alternative.
The detail specification shall indicate which test is performed. The combination pulse test should be performed in
accordance with Annex A.
Table I
Replace the text related to Group 1 of Table I by the following new text:
Sample size &
D
criterion of
Subclause number and Performance
or Conditions of test
acceptability
test requirements
ND (see Note 1)
(see Note 2)
(see Note 1) (see Note 1)
n c t
Group 1 D 8 1 3
Pulse current
4.5 Pulse current
10 pulses 8/20 μs, in one
(or combination
direction, 2 per min
pulse, see Note 4).
- Visual examination
No
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.
Loading comments...