EN 61051-1:2008

Varistors for use in electronic equipment - Part 1: Generic specification

It is applicable to varistors with symmetrical voltage current characteristics for use in electronic equipment. It establishes standard terms, inspection procedures and methods of test for use in sectional and detail specifications for Qualification Approval and for Quality Assessment Systems for electronic components.

Varistoren zur Verwendung in Geräten der Elektronik - Teil 1: Fachgrundspezifikation

Varistances utilisées dans les équipements électroniques - Partie 1: Spécification générique

La CEI 61051-1:2007 est applicable aux varistances à caractéristique tension-courant symétrique utilisées dans les équipements électroniques. Cette deuxième édition annule et remplace la première édition publiée en 1991 et constitue une révision mineure qui porte sur des tableaux, des figures et des références.

Varistorji za elektronsko opremo - 1. del: Rodovna specifikacija (IEC 61051-1:2007)

General Information

• Status: Withdrawn
• Publication Date: 04-Nov-2008
• Withdrawal Date: 30-Sep-2011
• ICS: 31.040.99 - Other resistors
• Technical Committee: CLC/SR 40 - Capacitors and resistors for electronic equipment
• Drafting Committee: IEC/TC 40 - IEC_TC_40
• Parallel Committee: IEC/TC 40 - IEC_TC_40
• Current Stage: 9960 - Withdrawal effective - Withdrawal
• Start Date: 03-Dec-2021
• Completion Date: 03-Dec-2021
• Ref Project: SIST EN 61051-1:2009 - Varistors for use in electronic equipement - Part 1: Generic specification (IEC 61051-1:2007)

Relations

• Replaced By: EN IEC 61051-1:2018 - Varistors for use in electronic equipment - Part 1: Generic specification
• Effective Date: 23-Aug-2016

Standards Content (Sample)

SLOVENSKI STANDARD
01-januar-2009
Varistorji za elektronsko opremo - 1. del: Rodovna specifikacija (IEC 61051-
1:2007)
Varistors for use in electronic equipement - Part 1: Generic specification (IEC 61051-
1:2007)
Varistoren zur Verwendung in Geräten der Elektronik - Teil 1: Fachgrundspezifikation
(IEC 61051-1:2007)
Varistances utilisées dans les équipements électroniques - Partie 1: Spécification
générique (CEI 61051-1:2007)
Ta slovenski standard je istoveten z: EN 61051-1:2008
ICS:
31.040.99 Drugi upori Other resistors
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 61051-1
NORME EUROPÉENNE
November 2008
EUROPÄISCHE NORM
ICS 31.040.99 Supersedes CECC 42 000:1978

English version
Varistors for use in electronic equipement -
Part 1: Generic specification
(IEC 61051-1:2007)
Varistances utilisées  Varistoren zur Verwendung
dans les équipements électroniques - in Geräten der Elektronik -
Partie 1: Spécification générique Teil 1: Fachgrundspezifikation
(CEI 61051-1:2007) (IEC 61051-1:2007)

This European Standard was approved by CENELEC on 2008-10-01. 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 Central Secretariat 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 Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2008 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61051-1:2008 E
Foreword
The text of document 40/1775/CDV, future edition 2 of IEC 61051-1, prepared by IEC TC 40, Capacitors
and resistors for electronic equipment, was submitted to the IEC-CENELEC parallel Unique Acceptance
Procedure and was approved by CENELEC as EN 61051-1 on 2008-10-01.
This European Standard supersedes CECC 42 000:1978.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2009-07-01
– latest date by which the national standards conflicting
(dow) 2011-10-01
with the EN have to be withdrawn
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 61051-1:2007 was approved by CENELEC as a European
Standard without any modification.
__________
- 3 - EN 61051-1:2008
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable for the application 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  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year

IEC 60027 Series Letter symbols to be used in electrical EN 60027 Series
technology
IEC 60050 Series International Electrotechnical Vocabulary - -
(IEV)
IEC 60060-2 1994 High-voltage test techniques - EN 60060-2 1994
Part 2: Measuring systems
IEC 60062 2004 Marking codes for resistors and capacitors EN 60062 2005
+ corr. January 2007
IEC 60068-1 1988 Environmental testing -
+ corr. October 1988 Part 1: General and guidance
+ A1 1992 EN 60068-1 1994
IEC 60068-2-1 2007 Environmental testing - EN 60068-2-1 2007
Part 2-1: Tests - Test A: Cold

1)
IEC 60068-2-2 1974 Environmental testing - EN 60068-2-2 1993
A1 1993 Part 2: Tests - Tests B: Dry heat A1 1993

A2 1994 A2 1994
2)
IEC 60068-2-6 1995 Environmental testing - EN 60068-2-6 1995
Part 2: Tests - Test Fc: Vibration (sinusoidal)

IEC 60068-2-13 1983 Environmental testing - EN 60068-2-13 1999
Part 2: Tests - Test M: Low air pressure

IEC 60068-2-14 1984 Environmental testing -
+ A1 1986 Part 2: Tests - Test N: Change of temperature EN 60068-2-14 1999

IEC 60068-2-20 1979 Environmental testing -
3)
+ A2 1987 Part 2: Tests - Test T: Soldering HD 323.2.20 S3 1988

IEC 60068-2-21 2006 Environmental testing - EN 60068-2-21 2006
Part 2-21: Tests - Test U: Robustness of
terminations and integral mounting devices

IEC 60068-2-27 1987 Environmental testing - EN 60068-2-27 1993
Part 2: Tests - Test Ea and guidance: Shock

IEC 60068-2-29 1987 Environmental testing - EN 60068-2-29 1993
Part 2: Tests - Test Eb and guidance: Bump

IEC 60068-2-30 2005 Environmental testing - EN 60068-2-30 2005
Part 2-30: Tests - Test Db: Damp heat, cyclic
(12 h + 12 h cycle)
1)
EN 60068-2-2, which includes supplement A:1976 to IEC 60068-2-2, and its amendments are superseded by EN 60068-2-2:2007,
which is based on IEC 60068-2-2:2007.
2)
EN 60068-2-6 is superseded by EN 60068-2-6:2008, which is based on IEC 60068-2-6:2007.
3)
HD 323.2.20 S3 is superseded by EN 60068-2-20:2008, which is based on IEC 60068-2-20:2008.

Publication Year Title EN/HD Year

IEC 60068-2-45 1980 Environmental testing - EN 60068-2-45 1992
Part 2: Tests - Test XA and guidance:
Immersion in cleaning solvents

IEC 60068-2-54 2006 Environmental testing - EN 60068-2-54 2006
Part 2-54: Tests - Test Ta: Solderability
testing of electronic components by the
wetting balance method
IEC 60068-2-58 2004 Environmental testing - EN 60068-2-58 2004
Part 2-58: Tests - Test Td: Test methods for + corr. December 2004
solderability, resistance to dissolution of
metallization and to soldering heat of surface
mounting devices (SMD)
4)
IEC 60068-2-69 1995 Environmental testing - EN 60068-2-69 1996
Part 2: Tests - Test Te: Solderability testing of
electronic components for surface mount
technology by the wetting balance method

IEC 60068-2-78 2001 Environmental testing - EN 60068-2-78 2001
Part 2-78: Tests - Test Cab: Damp heat,
steady state
IEC 60294 1969 Measurement of the dimensions of a - -
cylindrical component having two axial
terminations
IEC 60410 1973 Sampling plans and procedures for inspection - -
by attributes
IEC 60617 Data- Graphical symbols for diagrams - -
base
IEC 60695-11-5 2004 Fire hazard testing - EN 60695-11-5 2005
Part 11-5: Test flames - Needle-flame test
method - Apparatus, confirmatory test
arrangement and guidance
IEC 60717 1981 Method for the determination of the space - -
required by capacitors and resistors with
unidirectional terminations
IEC 61249-2-7 2002 Materials for printed boards and other EN 61249-2-7 2002
interconnecting structures - + corr. September 2005
Part 2-7: Reinforced base materials, clad and
unclad - Epoxide woven E-glass laminated
sheet of defined flammability (vertical burning
test), copper-clad
5)
IEC QC 001002-3 - IEC Quality Assessment System for Electronic - -
Components (IECQ) - Rules of Procedure -
Part 3: Approval procedures
ISO 1000 1992 SI units and recommendations for the use of - -
A1 1998 their multiples and of certain other units

4)
EN 60068-2-69 is superseded by EN 60068-2-69:2007, which is based on IEC 60068-2-69:2007.
5)
Undated reference.
INTERNATIONAL IEC
STANDARD 61051-1
QC 420000
Second edition
2007-04
Varistors for use in electronic equipment –
Part 1:
Generic specification
PRICE CODE
Commission Electrotechnique Internationale V
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
For price, see current catalogue

– 2 – 61051-1 © IEC:2007(E)
CONTENTS
FOREWORD.5

1 General .7
1.1 Scope.7
1.2 Object .7
1.3 Normative references .7
2 Technical data.8
2.1 Units, symbols and terminology .8
2.2 Terms and definitions .9
2.3 Preferred values and characteristics.13
2.4 Marking .13
2.4.1 General .13
2.4.2 Coding.14
3 Quality assessment procedures.14
3.1 Qualification approval/quality assessment systems .14
3.2 Primary stage of manufacture.14
3.3 Structurally similar components.14
3.4 Qualification approval procedures .15
3.5 Quality conformance inspection.15
3.5.1 Certified records of released lots .15
3.5.2 Delayed delivery.15
3.5.3 Release for delivery before the completion of Group B tests .16
3.6 Alternative test methods .16
3.7 Unchecked parameters.16
4 Test and measurement procedures.16
4.1 General .16
4.2 Standard atmospheric conditions.16
4.2.1 Standard atmospheric conditions for testing .16
4.2.2 Recovery conditions .17
4.2.3 Referee conditions .17
4.2.4 Reference conditions.17
4.3 Drying and recovery .17
4.4 Visual examination and check of dimensions.18
4.4.1 Visual examination .18
4.4.2 Marking .18
4.4.3 Dimensions (gauging).18
4.4.4 Dimensions (detail).18
4.5 Nominal varistor voltage or leakage current (not applicable to pulse
measurements) .
4.5.1 Test procedure .18
4.5.2 Measurement and requirements.18
4.6 Pulse current.18
4.6.1 Standard pulse currents.19
4.6.2 Tolerances .19
4.6.3 Measurement of the pulse current .19
4.7 Voltage under pulse condition .19
4.8 Capacitance .20

61051-1 © IEC:2007(E) – 3 –
4.9 Voltage proof (for insulat
...