Varistors for use in electronic equipement - Part 1: Generic specification (IEC 61051-1:2007)

This standard is applicable to varistors with  symmetrical voltage-current characteristics for use in  electronic equipment.

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)

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Withdrawn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
17-Nov-2008
Withdrawal Date
13-Dec-2021
Technical Committee
Current Stage
9900 - Withdrawal (Adopted Project)
Start Date
13-Dec-2021
Due Date
05-Jan-2022
Completion Date
14-Dec-2021

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SLOVENSKI STANDARD
SIST EN 61051-1:2009
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
SIST EN 61051-1:2009 en

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

---------------------- Page: 1 ----------------------
SIST EN 61051-1:2009
---------------------- Page: 2 ----------------------
SIST EN 61051-1:2009
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
---------------------- Page: 3 ----------------------
SIST EN 61051-1:2009
EN 61051-1:2008 - 2 -
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.
__________
---------------------- Page: 4 ----------------------
SIST EN 61051-1:2009
- 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
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
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 -
+ 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)

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.

EN 60068-2-6 is superseded by EN 60068-2-6:2008, which is based on IEC 60068-2-6:2007.

HD 323.2.20 S3 is superseded by EN 60068-2-20:2008, which is based on IEC 60068-2-20:2008.

---------------------- Page: 5 ----------------------
SIST EN 61051-1:2009
EN 61051-1:2008 - 4 -
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)
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
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

EN 60068-2-69 is superseded by EN 60068-2-69:2007, which is based on IEC 60068-2-69:2007.

Undated reference.
---------------------- Page: 6 ----------------------
SIST EN 61051-1:2009
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
---------------------- Page: 7 ----------------------
SIST EN 61051-1:2009
– 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

---------------------- Page: 8 ----------------------
SIST EN 61051-1:2009
61051-1 © IEC:2007(E) – 3 –

4.9 Voltage proof (for insulated varistors only) ............................................................20

4.9.1 V-block method .........................................................................................20

4.9.2 Metal ball method ......................................................................................20

4.9.3 Foil method ...............................................................................................21

4.10 Insulation resistance (for insulated varistors only) .................................................21

4.10.1 Test procedure ..........................................................................................21

4.10.2 Measurement and requirements.................................................................21

4.11 Robustness of terminations ...................................................................................22

4.11.1 General .....................................................................................................22

4.11.2 Test Ua – Tensile ....................................................................................22

4.11.3 Test Ub – Bending (half of the number of terminations) .............................22

4.11.4 Test Uc – Torsion (other half of the number of terminations)......................22

4.11.5 Test Ud – Torque (for terminations with threaded studs or screws

and for integral mounting devices) .............................................................22

4.11.6 Visual examination ....................................................................................22

4.11.7 Final measurement ....................................................................................22

4.12 Resistance to soldering heat .................................................................................23

4.12.1 Preconditioning..........................................................................................23

4.12.2 Test procedure ..........................................................................................23

4.12.3 Recovery ...................................................................................................23

4.12.4 Final inspection, measurement and requirements ......................................23

4.13 Solderability ..........................................................................................................23

4.13.1 Test procedure ..........................................................................................23

4.13.2 Final inspection, measurements and requirements ....................................24

4.14 Rapid change of temperature ................................................................................24

4.14.1 Initial measurement ...................................................................................24

4.14.2 Test procedure ..........................................................................................24

4.14.3 Final inspection, measurement and requirements ......................................24

4.15 Bump ....................................................................................................................25

4.15.1 Initial measurement ...................................................................................25

4.15.2 Test procedure ..........................................................................................25

4.15.3 Final inspection, measurement and requirements ......................................25

4.16 Shock....................................................................................................................25

4.16.1 Initial measurement ...................................................................................25

4.16.2 Test procedure ..........................................................................................25

4.16.3 Final inspection, measurement and requirements ......................................25

4.17 Vibration................................................................................................................25

4.17.1 Initial measurement ...................................................................................25

4.17.2 Test procedure ..........................................................................................26

4.17.3 Final inspection, measurement and requirements ......................................26

4.18 Climatic sequence .................................................................................................26

4.18.1 Initial measurement ...................................................................................26

4.18.2 Dry heat ....................................................................................................26

4.18.3 Damp heat, cyclic, Test Db, first cycle .......................................................26

4.18.4 Cold ..........................................................................................................26

4.18.5 Low air pressure........................................................................................26

4.18.6 Damp heat, cyclic, Test Db, remaining cycles ............................................26

4.18.7 Final inspection, measurement and requirements ......................................27

4.19 Damp heat, steady state........................................................................................27

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SIST EN 61051-1:2009
– 4 – 61051-1 © IEC:2007(E)

4.19.1 Initial measurement ...................................................................................27

4.19.2 Test procedure ..........................................................................................27

4.19.3 Final inspection, measurement and requirements ......................................27

4.20 Fire hazard............................................................................................................28

4.21 Endurance at upper category temperature.............................................................28

4.22 Solvent resistance of marking................................................................................29

4.22.1 Test procedure ..........................................................................................29

4.22.2 Requirements ............................................................................................29

4.23 Component solvent resistance...............................................................................29

4.23.1 Initial measurements .................................................................................29

4.23.2 Test procedure ..........................................................................................29

4.23.3 Measurement and requirements.................................................................30

4.24 Mounting (for surface mount varistors only) ...........................................................30

Annex A (normative) Mounting for measurements of varistors..............................................32

Annex B (normative) Interpretation of sampling plans and procedures as described in

IEC 60410 for use within the IEC quality assessment system for electronic components.......34

Annex C (normative) Rules for the preparation of detail specifications for capacitors

and resistors for electronic equipment ..................................................................................35

Figure 1 – Shape of pulse current type 1 ..............................................................................11

Figure 2 – Shape of pulse current type 2 ..............................................................................12

Figure A.1 – Mounting methods for measurements ...............................................................32

Figure A.2 – Mounting method for measurements of surface mount varistors ........................33

Table 1 – Standard atmospheric conditions...........................................................................17

Table 2 – Accepted differences between specified and recorded pulse current values .........19

Table 3 – Force for wire terminations ....................................................................................22

Table 4 – Torque ..................................................................................................................22

Table 5 – Number of cycles ..................................................................................................27

---------------------- Page: 10 ----------------------
SIST EN 61051-1:2009
61051-1 © IEC:2007(E) – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
VARISTORS FOR USE IN ELECTRONIC EQUIPMENT –
Part 1: Generic specification
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote

international co-operation on all questions concerning standardization in the electrical and electronic fields. To

this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,

Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC

Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested

in the subject dealt with may participate in this preparatory work. International, governmental and non-

governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely

with the International Organization for Standardization (ISO) in accordance with conditions determined by

agreement between the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

consensus of opinion on the relevant subjects since each technical committee has representation from all

interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

misinterpretation by any end user.

4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

transparently to the maximum extent possible in their national and regional publications. Any divergence

between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in

the latter.

5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any

equipment declared to be in conformity with an IEC Publication.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

members of its technical committees and IEC National Committees for any personal injury, property damage or

other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC

Publications.

8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of

patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 61051-1 has been prepared by IEC technical committee 40:

Capacitors and resistors for electronic equipment.

This second edition cancels and replaces the first edition published in 1991 and constitutes a

minor revision related to tables, figures and references.
The text of this standard is based on the following documents:
CDV Report on voting
40/1775/CDV 40/1841/RVC

Full information on the voting for the approval of this standard can be found in the report on

voting indicated in the above table.

The QC number that appears on the front cover of this publication is the specification number

in the IEC Quality Assessment System for Electronic Components (IECQ).
---------------------- Page: 11 ----------------------
SIST EN 61051-1:2009
– 6 – 61051-1 © IEC:2007(E)

This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

The list of all the parts of the IEC 61051 series, under the general title Varistors for use in

electronic equipment, can be found on the IEC website.

The committee has decided that the contents of this 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.
A bilingual version of this publication may be issued at a later date.
---------------------- Page: 12 ----------------------
SIST EN 61051-1:2009
61051-1 © IEC:2007(E) – 7 –
VARISTORS FOR USE IN ELECTRONIC EQUIPMENT –
Part 1: Generic specification
1 General
1.1 Scope

This part of IEC 61051 is applicable to varistors with symmetrical voltage-current

characteristics for use in electronic equipment.
1.2 Object

The object of this standard is to establish 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.
1.3 Normative references

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.
IEC 60027 (all parts), Letter symbols to be used in electrical technology
IEC 60050 (all parts), International Electrotechnical Vocabulary (IEV)
IEC 60060-2:1994, High-voltage test techniques – Part 2: Measuring systems
IEC 60062:2004, Marking codes for resistors and capacitors.
IEC 60068-1:1988, Environmental testing – Part 1: General and guidance
Amendment 1 (1992)
IEC 60068-2-1:2007, Environmental testing – Part 2: Tests – Test A: Cold
IEC 60068-2-2:1974, Environmental testing – Part 2: Tests – Tests B: Dry heat
Amendment 1 (1993)
Amendment 2 (1994)

IEC 60068-2-6:1995, Environmental testing – Part 2: Tests – Test Fc and guidance: Vibration

(Sinusoidal)
IEC 60068
...

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