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.
The content of the corrigendum 1 (2025-11) has been included in this copy.
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.
Le contenu du corrigendum 1 (2025-11) a été pris en considération dans cet exemplaire.
General Information
Relations
Standards Content (Sample)
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
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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
CH-1211 Geneva 20 www.iec.ch
Switzerland
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 fuse-holder . 74
7.7 I t characteristics . 74
7.7.1 Pre-arcing I t values . 74
7.7.2 Operating I t values . 75
7.8 Overcurrent discrimination of "gG" fuse-links . 75
7.9 Protection against electric shock . 75
8 Tests . 75
8.1.6 Testing of fuse-holders . 75
8.3.1 Arrangement of the fuse . 76
8.3.3 Measurement of the power dissipation of the fuse-link . 76
8.4 Verification of operation . 77
8.4.1 Arrangement of the fuse . 77
8.5 Verification of the breaking capacity . 77
8.5.1 Arrangement of the fuse . 77
8.5.5 Test method . 78
8.5.8 Acceptability of test results . 78
8.7.4 Verification of overcurrent discrimination . 78
8.8 Verification of the degree of protection of enclosures . 78
8.8.1 Verification of protection against electric shock . 78
8.9 Verification of resistance to heat . 79
8.10 Verification of non-deterioration of contacts . 79
8.10.1 Arrangement of the fuse . 79
8.10.2 Test method . 79
8.10.3 Acceptability of test results . 80
8.12 Verification of the reliability of terminals . 83
Fuse system C – Cylindrical fuses (BS cylindrical fuse system). 91
1 General . 91
1.1 Scope . 91
2 Terms and definitions . 91
3 Conditions for operation in service . 91
4 Classification . 91
5 Characteristics of fuses . 92
5.2 Rated Voltage . 92
5.3 Rated current . 92
5.3.1 Rated current of the fuse-link . 92
5.3.2 Rated current of the fuse-holder . 92
5.5 Rated power dissipation of a fuse-link and rated acceptable power
dissipation of a fuse-holder . 92
5.6 Limits of time-current characteristics . 92
5.6.1 Time-current characteristics, time-current curves and overload curves . 92
5.6.2 Conventional times and currents . 92
5.7 Breaking range and breaking capacity . 93
5.7.2 Rated breaking capacity . 93
6 Markings . 93
7 Standard conditions for construction . 93
7.1 Mechanical design . 93
7.1.2 Connections including terminals . 93
7.1.6 Construction of a fuse-carrier . 93
7.1.7 Construction of a fuse-link . 93
7.1.8 Non-interchangeability . 93
7.1.9 Construction of a fuse-base . 93
7.2 Insulating properties and suitability for isolation . 94
7.3 Temperature rise, power dissipation of the fuse-link and acceptable power
dissipation of the fuse-holder . 94
7.7 I t characteristics . 94
7.9 Protection against electric shock . 94
8 Tests . 94
8.1 General . 94
8.1.4 Arrangement of the fuse . 94
8.3 Verification of temperature rise and power dissipation. 94
8.3.1 Arrangement of the fuse . 94
8.3.3 Measurement of the power dissipation of the fuse-link . 94
8.4 Verification of operation . 95
8.4.1 Arrangement of fuse . 95
8.5 Verification of breaking capacity . 95
8.5.1 Arrangement of the fuse . 95
8.5.2 Characteristics of the test circuit . 95
8.5.5 Test method . 95
8.5.8 Acceptability of test results . 95
8.10 Verification of non-deterioration of contacts . 95
8.10.1 Arrangement of the fuse . 95
8.10.2 Test method . 95
8.10.3 Acceptability of test results . 96
Fuse system F – Cylindrical fuse-links for use in plugs (BS plugtop system) . 104
1 General . 104
1.1 Scope . 104
2 Terms and definitions . 104
3 Conditions for operation in service . 104
4 Classification . 104
5 Characteristics of fuses . 104
5.2 Rated voltage . 104
5.3.1 Rated current of the fuse-link . 104
5.3.2 Rated current of the fuse-holder . 105
5.5 Rated power dissipation of a fuse-link and rated acceptable power
dissipation of a fuse-holder . 105
5.6.1 Time-current characteristics, time-current zones and overload curves . 105
5.6.2 Conventional times and currents . 105
5.6.3 Gates . 105
5.7.2 Rated breaking capacity . 105
6 Markings . 105
7 Standard conditions for construction . 106
7.1.7 Construction of a fuse-link . 106
– 6 – IEC 60269-3:2024 CMV © IEC 2024
7.1.8 Non-interchangeability . 106
7.2 Insulating properties and suitability for isolation . 106
7.3 Temperature rise, power dissipation of the fuse-link and acceptable power
dissipation of the fuse-holder . 106
7.7 I t characteristics . 106
7.7.1 Pre-arcing I t values . 106
7.9 Protection against electric shock . 106
8 Tests . 107
8.1.4 Arrangement of the fuse-link for tests . 107
8.1.5 Testing of fuse-links . 107
8.2.4 Acceptability of test results . 108
8.3 Verification of temperature rise and power dissipation. 109
8.3.1 Arrangement of the fuse . 109
8.3.4 Test method . 109
8.3.5 Acceptability of test results . 109
8.4 Verification of operation . 109
8.4.1 Arrangement of the fuse . 109
8.5 Breaking-capacity tests . 110
8.5.1 Arrangement of the fuse . 110
8.5.2 Characteristics of the test circuit . 110
8.5.4 Calibration of the test circuit . 110
8.5.5 Test method . 110
8.5.8 Acceptability of test results . 110
8.7 Verification of I t characteristics and overcurrent discrimination . 111
8.7.3 Verification of compliance for fuse-links at 0,01 s . 111
8.10 Verification of non-deterioration of contacts . 111
8.11.1 Mechanical strength . 111
Annex BB (informative) (for all fuse systems) – Alternative tests for tests No. 1 and
No. 2 of Table 20 of IEC 60269-1:2024 . 116
BB.1 Test method . 116
BB.2 Test No. 1 . 116
BB.3 Test No. 2 . 116
Annex CC (informative) Recommendations for future designs of fuses (for all fuse
systems) . 118
CC.1 Overview . 118
CC.2 Fuse contacts . 118
CC.3 Protection against electric shock . 118
Bibliography . 119
List of comments . 120
Figure 101 – Time-current zones for "gG" fuse-links . 36
Figure 102 – Time-current zones for "gG" fuse-links . 37
Figure 103 – Time-current zone for "gG" fuse-links 13 A and 32 A . 38
Figure 104 – Dummy fuse-links according to 8.3 and 8.9.1.1 . 39
Figure 105 – Test rigs for fuse-links . 40
Figure 106 – Test rigs for fuse-links . 41
Figure 107 – Test arrangement for fuse-bases according to 8.9.1.2 . 42
Figure 108 – Example of a torque wrench according to 8.9.2 . 43
Figure 109 – Measuring points according to 8.3.3, 8.3.4.1 and 8.10.2 of fuse system A . 44
Figure 110 – Fuse-link, D-type. Sizes D01-D03 . 45
Figure 111 – Fuse-link, D-type. Sizes DII-DIV . 47
Figure 112 – Fuse-carrier, D-type. Sizes D01-D03 . 48
Figure 113 – Fuse-carrier, D-type. Sizes DII-DIII . 49
Figure 114 – Fuse-carrier, D-type. Size DIV . 50
Figure 115 – Edison thread for D-type fuses; limit dimensions . 51
Figure 116 – Gauges for Edison thread for D-type fuses for screwed shells of fuse-
carrier go ring gauges . 52
Figure 117 – Gauges for Edison thread, D-type fuses, go and not-go plug gauges for
screwed shells of fuse-bases . 54
Figure 118 – Fuse-base, D-type. Sizes D01-D03 . 55
Figure 119 – Fuse-base, D-type. Sizes DII-DIV . 56
Figure 120 – Fuse-base, D-type for push-in gauge pieces. Size DII-DIII . 57
Figure 121 – Gauge-piece and hand-key, D-type. Sizes D01-D03 . 59
Figure 122 – Gauge-piece and hand-key, D-type. Sizes DII-DIV . 61
Figure 123 – Gauge-piece and hand-key, D-type push-in gauge rings. Size DII-DIII . 63
Figure 124 – Whitworth thread W 3/16 for screw-in gauge rings and corresponding
fuse-bases of sizes DII and DIII . 64
Figure 125 – Gauges C 17 for concentricity of fuse-bases . 65
Figure 126 – Test dummies DII, DIII, D01, D02 and D03 for fuse-carrier test . 66
Figure 127 – Time-current zone for "gG" fuse-links 40 A . 67
Figure 201 – Fuse-link . 84
Figure 202 – Dummy fuse-link . 85
Figure 203 – Test-rig and ferrules for the measurement of the voltage drop and the
verification of operating characteristics of the cartridge . 86
Figure 204 – Fuse-base, A-type and B-type . 87
Figure 205 – Housing for verification of operation of the fuse-links with a test rig
according to Figure 203 . 88
Figure 206 – Test rig and ferrules for verification of breaking capacity . 89
Figure 207 – Gauge for verification of the upholding of the cartridge in the fuse-carrier
during withdrawal . 90
Figure 301 – Details of cylindrical fuse-links. 97
Figure 302 – Typical outline dimensions of carriers and bases for 230 V cylindrical
fuse-links . 98
Figure 303 – Typical carrier and base for 400 V cylindrical fuse-links . 98
Figure 304 – Time-current zones for "gG" fuse-link. 99
Figure 305 – Time-current zones for "gG" fuse-link. 100
Figure 306 – Standard test rig for power-dissipation test . 101
Figure 307 – Breaking-capacity test rig . 103
Figure 601 – Dimensions for cylindrical fuse-links (primarily used in plugs) . 112
Figure 602 – Time-current zones for "gG" fuse-links . 113
Figure 603 – Test fuse-base . 114
Figure 604 – Typical diagram of the circuit used for breaking-capacity tests . 115
– 8 – IEC 60269-3:2024 CMV © IEC 2024
Figure BB.1 – Instant of making for Test No. 1 . 117
Table 101 – Maximum values of power dissipation . 18
Table 102 – Conventional time and current for "gG" fuse-links . 19
Table 103 – Gates for specified pre-arcing times of "gG" fuse-links with rated currents
2 A, 4 A, 6 A, 10 A, 13 A and 35 A . 19
Table 104 – Cross-sections of rigid (solid or stranded) or flexible copper conductors . 21
Table 105 – Creepage distances, clearances and distances through sealing compound . 23
Table 106 – Temperature-rise limits for terminals . 24
Table 107 – Pre-arcing I t values at 0,01 s for "gG" fuse-links . 24
Table 108 – I t values for the discrimination with circuit breakers . 25
Table 109 – Survey of tests on fuse-links . 26
Table 110 – Survey of tests on fuse-bases, fuse-carriers and gauge-pieces . 26
Table 111 – Test torque for verification of temperature rise and power dissipation . 27
Table 112 – Test according to 8.5.5.1 . 28
Table 113 – Test currents and I t limits for the discrimination test . 29
Table 114 – Power dissipation of a dummy fuse-link at rated and conventional fusing
currents including tolerances . 30
Table 115 – Test-torque for mechanical strength . 34
Table 116 – Mechanical strength of screw-thread . 34
Table 201 – Maximum values of rated power dissipation and values of rated
acceptable power dissipation . 70
Table 202 – Conventional times and currents for "gG" fuse-links. 71
Table 203 – Gates for specified pre-arcing times of "gG" fuse-links with rated currents
lower than 16 A . 71
Table 204 – Minimum rated breaking capacities . 71
Table 205 – Nominal section of copper conductors that the terminals shall accept. 72
Table 206 – Creepage distances and clearances . 74
Table 207 – Temperature rise limits for terminals . 74
Table 208 – Pre-arcing I t values at 0,01 s for "gG" fuse-links . 74
Table 209 – Survey of tests on fuse-link. 75
Table 210 – Survey of tests on fuse-holder and number of fuse-holders to be tested . 76
Table 211 – Screw-thread diameters and applied torques . 76
Table 212 – Values concerning the choice and the adjustment of the test base . 77
Table 213 – Values for adjustment of the test base . 78
Table 214 – Hammer and height of fall for test for verification of resistance to shocks . 81
Table 215 – Torque to be applied to the fuse-carrier. 82
Table 216 – Mechanical strength of screw-thread . 83
Table 301 – Conventional time and current for "gG" fuse-links . 92
Table 302 – Temperature-rise limits for terminals . 94
Table 303 – Mechanical strength of screw-thread . 96
Table 601 – Conventional times and conventional currents . 105
Table 602 – Gates for specified pre-arcing times of "gG" fuse-links for use in plugs . 105
Table 603 – Temperature-rise limits for terminals . 106
Table 604 – Pre-arcing I t values at 0,01 s for "gG" fuse-links . 106
Table 605 – Survey of tests on fuse-links . 108
Table 606 – Values for breaking-capacity tests . 110
Table BB.1 – Approximate values of prospective currents for breaking capacity test No. 2. 116
– 10 – IEC 60269-3:2024 CMV © IEC 2024
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LOW-VOLTAGE FUSES –
Part 3: Supplementary requirements for fuses for use operation 1 by
unskilled persons (fuses mainly for household and similar applications) –
Examples of standardized systems of fuses A to F
FOREWORD
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9) IE
...
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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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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Stay up to date on all new IEC publications. Just Published
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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.
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further assistance, please contact the Customer Service
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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 . 67
Fuse system B – Cylindrical fuses (NF cylindrical fuse system) . 68
1 General . 68
1.1 Scope . 68
2 Terms and definitions . 68
3 Conditions for operation in service . 68
4 Classification . 69
5 Characteristics of fuses . 69
5.2 Rated voltage . 69
5.3.1 Rated current of the fuse-link . 69
5.3.2 Rated current of the fuse-holder . 69
5.5 Rated power dissipation of a fuse-link and rated acceptable power
dissipation of a fuse-holder . 69
5.6.2 Conventional times and currents . 69
5.6.3 Gates . 70
5.7.2 Rated breaking capacity . 70
6 Markings. 70
7 Standard conditions for construction . 70
7.1 Mechanical design . 71
7.1.2 Connections including terminals . 71
7.1.6 Construction of a fuse-carrier . 71
7.1.7 Construction of a fuse-link . 71
– 4 – IEC 60269-3:2024 © IEC 2024
7.1.8 Non-interchangeability . 72
7.1.9 Construction of a fuse-base . 72
7.2 Insulating properties and suitability for isolation . 72
7.3 Temperature rise, power dissipation of the fuse-link and acceptable power
dissipation of the fuse-holder . 73
7.7 I t characteristics . 73
7.7.1 Pre-arcing I t values . 73
7.7.2 Operating I t values . 74
7.8 Overcurrent discrimination of "gG" fuse-links . 74
7.9 Protection against electric shock . 74
8 Tests . 74
8.1.6 Testing of fuse-holders . 74
8.3.1 Arrangement of the fuse . 75
8.3.3 Measurement of the power dissipation of the fuse-link . 75
8.4 Verification of operation . 76
8.4.1 Arrangement of the fuse . 76
8.5 Verification of the breaking capacity . 76
8.5.1 Arrangement of the fuse . 76
8.5.5 Test method . 77
8.5.8 Acceptability of test results . 77
8.7.4 Verification of overcurrent discrimination . 77
8.8 Verification of the degree of protection of enclosures . 77
8.8.1 Verification of protection against electric shock . 77
8.9 Verification of resistance to heat . 78
8.10 Verification of non-deterioration of contacts . 78
8.10.1 Arrangement of the fuse . 78
8.10.2 Test method . 78
8.10.3 Acceptability of test results . 79
8.12 Verification of the reliability of terminals . 82
Fuse system C – Cylindrical fuses (BS cylindrical fuse system) . 90
1 General . 90
1.1 Scope . 90
2 Terms and definitions . 90
3 Conditions for operation in service . 90
4 Classification . 90
5 Characteristics of fuses . 91
5.2 Rated Voltage . 91
5.3 Rated current . 91
5.3.1 Rated current of the fuse-link . 91
5.3.2 Rated current of the fuse-holder . 91
5.5 Rated power dissipation of a fuse-link and rated acceptable power
dissipation of a fuse-holder . 91
5.6 Limits of time-current characteristics . 91
5.6.1 Time-current characteristics, time-current curves and overload curves . 91
5.6.2 Conventional times and currents . 91
5.7 Breaking range and breaking capacity . 92
5.7.2 Rated breaking capacity . 92
6 Markings. 92
7 Standard conditions for construction . 92
7.1 Mechanical design . 92
7.1.2 Connections including terminals . 92
7.1.6 Construction of a fuse-carrier . 92
7.1.7 Construction of a fuse-link . 92
7.1.8 Non-interchangeability . 92
7.1.9 Construction of a fuse-base . 92
7.2 Insulating properties and suitability for isolation . 93
7.3 Temperature rise, power dissipation of the fuse-link and acceptable power
dissipation of the fuse-holder . 93
7.7 I t characteristics . 93
7.9 Protection against electric shock . 93
8 Tests . 93
8.1 General . 93
8.1.4 Arrangement of the fuse . 93
8.3 Verification of temperature rise and power dissipation . 93
8.3.1 Arrangement of the fuse . 93
8.3.3 Measurement of the power dissipation of the fuse-link . 93
8.4 Verification of operation . 94
8.4.1 Arrangement of fuse . 94
8.5 Verification of breaking capacity . 94
8.5.1 Arrangement of the fuse . 94
8.5.2 Characteristics of the test circuit . 94
8.5.5 Test method . 94
8.5.8 Acceptability of test results . 94
8.10 Verification of non-deterioration of contacts . 94
8.10.1 Arrangement of the fuse . 94
8.10.2 Test method . 94
8.10.3 Acceptability of test results . 95
Fuse system F – Cylindrical fuse-links for use in plugs (BS plugtop system) . 103
1 General . 103
1.1 Scope . 103
2 Terms and definitions . 103
3 Conditions for operation in service . 103
4 Classification . 103
5 Characteristics of fuses . 103
5.2 Rated voltage . 103
5.3.1 Rated current of the fuse-link . 103
5.3.2 Rated current of the fuse-holder . 104
5.5 Rated power dissipation of a fuse-link and rated acceptable power
dissipation of a fuse-holder . 104
5.6.1 Time-current characteristics, time-current zones and overload curves . 104
5.6.2 Conventional times and currents . 104
5.6.3 Gates . 104
5.7.2 Rated breaking capacity . 104
6 Markings. 104
7 Standard conditions for construction . 105
7.1.7 Construction of a fuse-link . 105
– 6 – IEC 60269-3:2024 © IEC 2024
7.1.8 Non-interchangeability . 105
7.2 Insulating properties and suitability for isolation . 105
7.3 Temperature rise, power dissipation of the fuse-link and acceptable power
dissipation of the fuse-holder . 105
7.7 I t characteristics . 105
7.7.1 Pre-arcing I t values . 105
7.9 Protection against electric shock . 105
8 Tests . 106
8.1.4 Arrangement of the fuse-link for tests . 106
8.1.5 Testing of fuse-links . 106
8.2.4 Acceptability of test results . 107
8.3 Verification of temperature rise and power dissipation . 108
8.3.1 Arrangement of the fuse . 108
8.3.4 Test method . 108
8.3.5 Acceptability of test results . 108
8.4 Verification of operation . 108
8.4.1 Arrangement of the fuse . 108
8.5 Breaking-capacity tests . 109
8.5.1 Arrangement of the fuse . 109
8.5.2 Characteristics of the test circuit . 109
8.5.4 Calibration of the test circuit . 109
8.5.5 Test method . 109
8.5.8 Acceptability of test results . 109
8.7 Verification of I t characteristics and overcurrent discrimination . 110
8.7.3 Verification of compliance for fuse-links at 0,01 s . 110
8.10 Verification of non-deterioration of contacts . 110
8.11.1 Mechanical strength. 110
Annex BB (informative) (for all fuse systems) – Alternative tests for tests No. 1 and
No. 2 of Table 20 of IEC 60269-1:2024 . 115
BB.1 Test method . 115
BB.2 Test No. 1 . 115
BB.3 Test No. 2 . 115
Annex CC (informative) Recommendations for future designs of fuses (for all fuse
systems) . 117
CC.1 Overview. 117
CC.2 Fuse contacts . 117
CC.3 Protection against electric shock . 117
Bibliography . 118
Figure 101 – Time-current zones for "gG" fuse-links . 35
Figure 102 – Time-current zones for "gG" fuse-links . 36
Figure 103 – Time-current zone for "gG" fuse-links 13 A and 32 A . 37
Figure 104 – Dummy fuse-links according to 8.3 and 8.9.1.1 . 38
Figure 105 – Test rigs for fuse-links . 39
Figure 106 – Test rigs for fuse-links . 40
Figure 107 – Test arrangement for fuse-bases according to 8.9.1.2 . 41
Figure 108 – Example of a torque wrench according to 8.9.2 . 42
Figure 109 – Measuring points according to 8.3.3, 8.3.4.1 and 8.10.2 of fuse system A . 43
Figure 110 – Fuse-link, D-type. Sizes D01-D03 . 44
Figure 111 – Fuse-link, D-type. Sizes DII-DIV . 46
Figure 112 – Fuse-carrier, D-type. Sizes D01-D03 . 47
Figure 113 – Fuse-carrier, D-type. Sizes DII-DIII. 48
Figure 114 – Fuse-carrier, D-type. Size DIV . 49
Figure 115 – Edison thread for D-type fuses; limit dimensions . 50
Figure 116 – Gauges for Edison thread for D-type fuses for screwed shells of fuse-
carrier go ring gauges . 51
Figure 117 – Gauges for Edison thread, D-type fuses, go and not-go plug gauges for
screwed shells of fuse-bases . 53
Figure 118 – Fuse-base, D-type. Sizes D01-D03 . 54
Figure 119 – Fuse-base, D-type. Sizes DII-DIV . 55
Figure 120 – Fuse-base, D-type for push-in gauge pieces. Size DII-DIII . 56
Figure 121 – Gauge-piece and hand-key, D-type. Sizes D01-D03 . 58
Figure 122 – Gauge-piece and hand-key, D-type. Sizes DII-DIV . 60
Figure 123 – Gauge-piece and hand-key, D-type push-in gauge rings. Size DII-DIII . 62
Figure 124 – Whitworth thread W 3/16 for screw-in gauge rings and corresponding
fuse-bases of sizes DII and DIII . 63
Figure 125 – Gauges C 17 for concentricity of fuse-bases . 64
Figure 126 – Test dummies DII, DIII, D01, D02 and D03 for fuse-carrier test . 65
Figure 127 – Time-current zone for "gG" fuse-links 40 A . 66
Figure 201 – Fuse-link . 83
Figure 202 – Dummy fuse-link . 84
Figure 203 – Test-rig and ferrules for the measurement of the voltage drop and the
verification of operating characteristics of the cartridge . 85
Figure 204 – Fuse-base, A-type and B-type . 86
Figure 205 – Housing for verification of operation of the fuse-links with a test rig
according to Figure 203 . 87
Figure 206 – Test rig and ferrules for verification of breaking capacity . 88
Figure 207 – Gauge for verification of the upholding of the cartridge in the fuse-carrier
during withdrawal . 89
Figure 301 – Details of cylindrical fuse-links . 96
Figure 302 – Typical outline dimensions of carriers and bases for 230 V cylindrical
fuse-links . 97
Figure 303 – Typical carrier and base for 400 V cylindrical fuse-links . 97
Figure 304 – Time-current zones for "gG" fuse-link . 98
Figure 305 – Time-current zones for "gG" fuse-link . 99
Figure 306 – Standard test rig for power-dissipation test . 100
Figure 307 – Breaking-capacity test rig . 102
Figure 601 – Dimensions for cylindrical fuse-links (primarily used in plugs). 111
Figure 602 – Time-current zones for "gG" fuse-links . 112
Figure 603 – Test fuse-base . 113
Figure 604 – Typical diagram of the circuit used for breaking-capacity tests . 114
Figure BB.1 – Instant of making for Test No. 1 . 116
– 8 – IEC 60269-3:2024 © IEC 2024
Table 101 – Maximum values of power dissipation . 17
Table 102 – Conventional time and current for "gG" fuse-links . 18
Table 103 – Gates for specified pre-arcing times of "gG" fuse-links with rated currents
2 A, 4 A, 6 A, 10 A, 13 A and 35 A . 18
Table 104 – Cross-sections of rigid (solid or stranded) or flexible copper conductors . 20
Table 105 – Creepage distances, clearances and distances through sealing compound . 22
Table 106 – Temperature-rise limits for terminals . 23
Table 107 – Pre-arcing I t values at 0,01 s for "gG" fuse-links . 23
Table 108 – I t values for the discrimination with circuit breakers . 23
Table 109 – Survey of tests on fuse-links . 25
Table 110 – Survey of tests on fuse-bases, fuse-carriers and gauge-pieces . 25
Table 111 – Test torque for verification of temperature rise and power dissipation . 26
Table 112 – Test according to 8.5.5.1 . 27
Table 113 – Test currents and I t limits for the discrimination test . 28
Table 114 – Power dissipation of a dummy fuse-link at rated and conventional fusing
currents including tolerances . 29
Table 115 – Test-torque for mechanical strength . 33
Table 116 – Mechanical strength of screw-thread . 33
Table 201 – Maximum values of rated power dissipation and values of rated
acceptable power dissipation . 69
Table 202 – Conventional times and currents for "gG" fuse-links . 70
Table 203 – Gates for specified pre-arcing times of "gG" fuse-links with rated currents
lower than 16 A . 70
Table 204 – Minimum rated breaking capacities . 70
Table 205 – Nominal section of copper conductors that the terminals shall accept . 71
Table 206 – Creepage distances and clearances . 73
Table 207 – Temperature rise limits for terminals . 73
Table 208 – Pre-arcing I t values at 0,01 s for "gG" fuse-links . 73
Table 209 – Survey of tests on fuse-link . 74
Table 210 – Survey of tests on fuse-holder and number of fuse-holders to be tested . 75
Table 211 – Screw-thread diameters and applied torques . 75
Table 212 – Values concerning the choice and the adjustment of the test base . 76
Table 213 – Values for adjustment of the test base . 77
Table 214 – Hammer and height of fall for test for verification of resistance to shocks . 80
Table 215 – Torque to be applied to the fuse-carrier . 81
Table 216 – Mechanical strength of screw-thread . 82
Table 301 – Conventional time and current for "gG" fuse-links . 91
Table 302 – Temperature-rise limits for terminals . 93
Table 303 – Mechanical strength of screw-thread . 95
Table 601 – Conventional times and conventional currents . 104
Table 602 – Gates for specified pre-arcing times of "gG" fuse-links for use in plugs . 104
Table 603 – Temperature-rise limits for terminals . 105
Table 604 – Pre-arcing I t values at 0,01 s for "gG" fuse-links . 105
Table 605 – Survey of tests on fuse-links . 107
Table 606 – Values for breaking-capacity tests . 109
Table BB.1 – Approximate values of prospective currents for breaking capacity test No. 2 . 115
– 10 – IEC 602
...
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