IEC 60269-3:2024
(Main)Low-voltage fuses - Part 3: Supplementary requirements for fuses for operation by unskilled persons (fuses mainly for household and similar applications) - Examples of standardized systems of fuses A to F
Low-voltage fuses - Part 3: Supplementary requirements for fuses for operation by unskilled persons (fuses mainly for household and similar applications) - Examples of standardized systems of fuses A to F
IEC 60269-3:2024 is divided into four fuse systems, each dealing with a specific example of standardized fuses for use by unskilled persons. This part applies to “gG” fuses only. Unskilled persons do not have technical knowledge or sufficient experience. To avoid dangers, which electricity may create, the relevant part of the fuse standard shall provide requirements for maximum safety in service. IEC 60269-3 provides four systems for use by unskilled persons. Instructions for the safe operation of fuse-links are provided in the manufacturer’s literature. All systems provide their own mechanical solution to avoid the use of a fuse-link with higher current rating (non-interchangeability) whereas the protection of cables and lines is ensured. The applicant is required to take care to replace a fuse-link by the same type.
Fusibles basse tension - Partie 3: Exigences supplémentaires pour les fusibles destinés à être utilisés par des personnes non qualifiées (fusibles pour usages essentiellement domestiques et analogues) - Exemples de systèmes de fusibles normalisés A à F
L'IEC 60269-3:2024 est divisée en quatre systèmes de fusibles traitant chacun d'un exemple spécifique de fusible normalisé destiné à être utilisés par des personnes non qualifiées. La présente partie s'applique uniquement aux fusibles "gG". Les personnes non qualifiées ne disposent pas des connaissances techniques ou d'une expérience suffisante. Pour éviter les dangers que l'électricité peut présenter, la partie de la norme relative aux fusibles doit fournir des exigences pour une sécurité maximale en service. L'IEC 60269-3 définit quatre systèmes destinés à être utilisés par des personnes non qualifiées. Des instructions permettant le fonctionnement en toute sécurité des éléments de remplacement sont fournies dans la documentation du fabricant. Tous les systèmes fournissent leur propre solution mécanique pour éviter l'utilisation d'un élément de remplacement avec un courant assigné supérieur (non-interchangeabilité) tandis que la protection des câbles et des lignes est assurée. Le demandeur doit veiller à remplacer un élément de remplacement par un autre du même type.
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IEC 60269-3 ®
Edition 5.0 2024-08
COMMENTED VERSION
INTERNATIONAL
STANDARD
Low- voltage fuses –
Part 3: Supplementary requirements for fuses for use operation by unskilled
persons (fuses mainly for household or similar applications) – Examples of
standardized systems of fuses A to F
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
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3, rue de Varembé info@iec.ch
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About the IEC
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International Standards for all electrical, electronic and related technologies.
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IEC 60269-3 ®
Edition 5.0 2024-08
COMMENTED VERSION
INTERNATIONAL
STANDARD
Low- voltage fuses –
Part 3: Supplementary requirements for fuses for use operation by unskilled
persons (fuses mainly for household or similar applications) – Examples of
standardized systems of fuses A to F
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.120.50 ISBN 978-2-8322-9551-9
– 2 – IEC 60269-3:2024 CMV © IEC 2024
CONTENTS
FOREWORD . 10
INTRODUCTION . 13
1 General Scope . 14
2 Normative references . 15
3 Terms and definitions . 15
Fuse system A: D type fuse system . 17
1 General . 17
1.1 Scope . 17
2 Terms and definitions . 17
3 Conditions for operation in service . 17
4 Classification . 17
5 Characteristics of fuses . 17
5.2 Rated voltage . 17
5.3.1 Rated current of the fuse-link . 18
5.3.2 Rated current of the fuse-holder . 18
5.3.3 Rated current of the gauge-piece . 18
5.5 Rated power dissipation of a fuse-link and rated acceptable power
dissipation of a fuse-holder . 18
5.6 Limits of time-current characteristics . 18
5.6.1 Time-current characteristics, time-current zones and overload curves . 18
5.6.2 Conventional times and currents . 19
5.6.3 Gates . 19
5.7 Breaking range and breaking capacity . 19
5.7.2 Rated breaking capacity . 19
6 Markings . 19
6.1 General . 19
6.2 Marking of fuse-bases. 20
6.3 Marking of the gauge-pieces . 20
7 Standard conditions for construction . 20
7.1 Mechanical design . 20
7.1.2 Connections including terminals . 20
7.1.3 Fuse-contacts. 21
7.1.4 Construction of a gauge-piece . 21
7.1.6 Construction of a fuse-carrier . 21
7.1.7 Construction of a fuse-link . 22
7.1.8 Non-interchangeability . 22
7.1.9 Construction of a fuse-base . 22
7.2 Insulating properties and suitability for isolation . 23
7.3 Temperature rise, power dissipation of the fuse-link and acceptable power
dissipation of the fuse-holder . 24
7.7 I t characteristics . 24
7.7.1 Pre-arcing I t values . 24
7.7.2 Operating I t values . 24
7.8 Overcurrent discrimination of "gG" fuse-links . 24
7.9 Protection against electric shock . 25
8 Tests . 25
8.1.4 Arrangement of the fuse and dimensions . 25
8.2 Verification of the insulating properties and of the suitability for isolation . 26
8.2.1 Arrangement of the fuse-holder . 26
8.2.6 Creepage distances, clearances and distances through sealing
compound . 27
8.3 Verification of temperature rise and power dissipation. 27
8.3.1 Arrangement of the fuse . 27
8.3.3 Measurement of the power dissipation of the fuse-link . 27
8.3.5 Acceptability of test results . 27
8.5.1 Arrangement of the fuse . 28
8.5.2 Characteristics of the test circuit . 28
8.5.5 Test method . 29
8.5.8 Acceptability of test results . 29
8.7.4 Verification of overcurrent discrimination . 29
8.9 Verification of resistance to heat . 30
8.9.1 Fuse-base . 30
8.9.2 Fuse-carrier . 31
8.10 Verification of non-deterioration of contacts . 31
8.10.1 Arrangement of the fuse . 31
8.10.2 Test method . 31
8.10.3 Acceptability of test results . 32
8.11 Mechanical and miscellaneous tests . 33
8.11.1 Mechanical strength . 33
Annex AA (informative) Special test for cable overload protection (for fuse system A) . 68
AA.1 Arrangement of the fuse. 68
AA.2 Test method and acceptability of test results . 68
Fuse system B – Cylindrical fuses (NF cylindrical fuse system) . 69
1 General . 69
1.1 Scope . 69
2 Terms and definitions . 69
3 Conditions for operation in service . 69
4 Classification . 70
5 Characteristics of fuses . 70
5.2 Rated voltage . 70
5.3.1 Rated current of the fuse-link . 70
5.3.2 Rated current of the fuse-holder . 70
5.5 Rated power dissipation of a fuse-link and rated acceptable power
dissipation of a fuse-holder . 70
5.6.2 Conventional times and currents . 70
5.6.3 Gates . 71
5.7.2 Rated breaking capacity . 71
6 Markings . 71
7 Standard conditions for construction . 71
7.1 Mechanical design . 72
7.1.2 Connections including terminals . 72
7.1.6 Construction of a fuse-carrier . 72
7.1.7 Construction of a fuse-link . 72
– 4 – IEC 60269-3:2024 CMV © IEC 2024
7.1.8 Non-interchangeability . 73
7.1.9 Construction of a fuse-base . 73
7.2 Insulating properties and suitability for isolation . 73
7.3 Temperature rise, power dissipation of the fuse-link and acceptable power
dissipation of the
...
IEC 60269-3 ®
Edition 5.0 2024-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Low- voltage fuses –
Part 3: Supplementary requirements for fuses for operation by unskilled persons
(fuses mainly for household or similar applications) – Examples of standardized
systems of fuses A to F
Fusibles basse tension –
Partie 3: Exigences supplémentaires pour les fusibles destinés à être utilisés
par des personnes non qualifiées (fusibles pour usages essentiellement
domestiques et analogues) – Exemples de systèmes de fusibles normalisés A à
F
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.
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utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie et
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questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez
les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.
IEC Secretariat Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
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 corrigendum or an amendment might have been published.
IEC publications search - webstore.iec.ch/advsearchform IEC Products & Services Portal - products.iec.ch
The advanced search enables to find IEC publications by a Discover our powerful search engine and read freely all the
variety of criteria (reference number, text, technical publications previews, graphical symbols and the glossary.
committee, …). It also gives information on projects, replaced With a subscription you will always have access to up to date
and withdrawn publications. content tailored to your needs.
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Electropedia - www.electropedia.org
Stay up to date on all new IEC publications. Just Published
The world's leading online dictionary on electrotechnology,
details all new publications released. Available online and once
containing more than 22 500 terminological entries in English
a month by email.
and French, with equivalent terms in 25 additional languages.
Also known as the International Electrotechnical Vocabulary
IEC Customer Service Centre - webstore.iec.ch/csc
(IEV) online.
If you wish to give us your feedback on this publication or need
further assistance, please contact the Customer Service
Centre: sales@iec.ch.
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IEC 60269-3 ®
Edition 5.0 2024-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Low- voltage fuses –
Part 3: Supplementary requirements for fuses for operation by unskilled persons
(fuses mainly for household or similar applications) – Examples of standardized
systems of fuses A to F
Fusibles basse tension –
Partie 3: Exigences supplémentaires pour les fusibles destinés à être utilisés par
des personnes non qualifiées (fusibles pour usages essentiellement
domestiques et analogues) – Exemples de systèmes de fusibles normalisés A à
F
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.120.50 ISBN 978-2-8322-9107-8
– 2 – IEC 60269-3:2024 © IEC 2024
CONTENTS
FOREWORD . 10
INTRODUCTION . 13
1 General Scope. 14
2 Normative references . 14
3 Terms and definitions . 15
Fuse system A: D type fuse system . 16
1 General . 16
1.1 Scope . 16
2 Terms and definitions . 16
3 Conditions for operation in service . 16
4 Classification . 16
5 Characteristics of fuses . 16
5.2 Rated voltage . 16
5.3.1 Rated current of the fuse-link . 17
5.3.2 Rated current of the fuse-holder . 17
5.3.3 Rated current of the gauge-piece . 17
5.5 Rated power dissipation of a fuse-link and rated acceptable power
dissipation of a fuse-holder . 17
5.6 Limits of time-current characteristics . 17
5.6.1 Time-current characteristics, time-current zones and overload curves . 17
5.6.2 Conventional times and currents . 18
5.6.3 Gates . 18
5.7 Breaking range and breaking capacity . 18
5.7.2 Rated breaking capacity . 18
6 Markings. 18
6.1 General . 18
6.2 Marking of fuse-bases . 19
6.3 Marking of the gauge-pieces . 19
7 Standard conditions for construction . 19
7.1 Mechanical design . 19
7.1.2 Connections including terminals . 19
7.1.3 Fuse-contacts . 20
7.1.4 Construction of a gauge-piece . 20
7.1.6 Construction of a fuse-carrier . 20
7.1.7 Construction of a fuse-link . 21
7.1.8 Non-interchangeability . 21
7.1.9 Construction of a fuse-base . 21
7.2 Insulating properties and suitability for isolation . 22
7.3 Temperature rise, power dissipation of the fuse-link and acceptable power
dissipation of the fuse-holder . 22
7.7 I t characteristics . 23
7.7.1 Pre-arcing I t values . 23
7.7.2 Operating I t values . 23
7.8 Overcurrent discrimination of "gG" fuse-links . 23
7.9 Protection against electric shock . 24
8 Tests . 24
8.1.4 Arrangement of the fuse and dimensions . 24
8.2 Verification of the insulating properties and of the suitability for isolation . 25
8.2.1 Arrangement of the fuse-holder . 25
8.2.6 Creepage distances, clearances and distances through sealing
compound . 26
8.3 Verification of temperature rise and power dissipation . 26
8.3.1 Arrangement of the fuse . 26
8.3.3 Measurement of the power dissipation of the fuse-link . 26
8.3.5 Acceptability of test results . 26
8.5.1 Arrangement of the fuse . 27
8.5.2 Characteristics of the test circuit . 27
8.5.5 Test method . 28
8.5.8 Acceptability of test results . 28
8.7.4 Verification of overcurrent discrimination . 28
8.9 Verification of resistance to heat . 29
8.9.1 Fuse-base . 29
8.9.2 Fuse-carrier . 30
8.10 Verification of non-deterioration of contacts . 30
8.10.1 Arrangement of the fuse . 30
8.10.2 Test method . 30
8.10.3 Acceptability of test results . 31
8.11 Mechanical and miscellaneous tests . 32
8.11.1 Mechanical strength. 32
Annex AA (informative) Special test for cable overload protection (for fuse system A) . 67
AA.1 Arrangement of the fuse . 67
AA.2 Test method and acceptability of test results .
...
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