EN IEC 60269-3:2025

SLOVENSKI STANDARD
01-september-2025
Nizkonapetostne varovalke - 3. del: Dodatne zahteve za varovalke, ki jih
uporabljajo nestrokovne osebe (uporaba varovalk zlasti v gospodinjstvu in
podobnih okoljih) - Primeri standardiziranih sistemov varovalk od A do F
Low-voltage fuses - Part 3: Supplementary requirements for fuses for use by unskilled
persons (fuses mainly for household or similar applications) - Examples of standardized
systems of fuses A to F
Niederspannungssicherungen - Teil 3: Ergänzende Anforderungen an Sicherungen zur
Betätigung durch Laien (Sicherungen vorwiegend für den Hausgebrauch und ähnliche
Anwendungen) - Beispiele für genormte Sicherungssysteme A bis 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
Ta slovenski standard je istoveten z: EN IEC 60269-3:2025
ICS:
29.120.50 Varovalke in druga Fuses and other overcurrent
nadtokovna zaščita protection devices
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 60269-3

NORME EUROPÉENNE
EUROPÄISCHE NORM June 2025
ICS 29.120.50 Supersedes HD 60269-3:2010; HD 60269-
3:2010/A1:2013; HD 60269-3:2010/A2:2022
English Version
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)
Fusibles basse tension - Partie 3: Exigences Niederspannungssicherungen - Teil 3: Ergänzende
supplémentaires pour les fusibles destinés à être utilisés Anforderungen an Sicherungen zur Betätigung durch Laien
par des personnes non qualifiées (fusibles pour usages (Sicherungen vorwiegend für den Hausgebrauch und
essentiellement domestiques et analogues) - Exemples de ähnliche Anwendungen) - Beispiele für genormte
systèmes de fusibles normalisés A à F Sicherungssysteme A bis F
(IEC 60269-3:2024) (IEC 60269-3:2024)
This European Standard was approved by CENELEC on 2024-10-16. 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 CEN-CENELEC
Management Centre 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 CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60269-3:2025 E

European foreword
The text of document 32B/745/FDIS, future edition 5 of IEC 60269-3, prepared by SC 32B "Low-
voltage fuses" of IEC/TC 32 "Fuses" was submitted to the IEC-CENELEC parallel vote and approved
by CENELEC as EN IEC 60269-3:2025.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2026-06-30
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2028-06-30
document have to be withdrawn
This document supersedes HD 60269-3:2010 and all of its amendments and corrigenda (if any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
This document is read in conjunction with EN IEC 60269-1:2025.
This document has been prepared under a standardization request addressed to CENELEC by the
European Commission. The Standing Committee of the EFTA States subsequently approves these
requests for its Member States.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 60269-3:2024 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standard indicated:
IEC 60529 NOTE Approved as EN 60529
IEC 60269-6 NOTE Approved as EN 60269-6
ISO 228-1 NOTE Approved as EN ISO 228-1
ISO 228-2 NOTE Approved as EN ISO 228-2
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 1  Where an International Publication has been modified by common modifications, indicated by (mod),
the relevant EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cencenelec.eu.
Publication Year Title EN/HD Year
IEC 60068-2-31 - Environmental testing - Part 2-31: Tests - EN 60068-2-31 -
Test Ec: Rough handling shocks, primarily
for equipment-type specimens
IEC 60269-1 2024 Low-voltage fuses - Part 1: General EN IEC 60269-1 2025
requirements
IEC 60664 series Insulation coordination for equipment within EN IEC 60664 series
low-voltage supply systems
IEC 60898-1 (mod) 2015 Electrical accessories - Circuit-breakers for EN 60898-1 2019
overcurrent protection for household and
similar installations - Part 1: Circuit-
breakers for a.c. operation
- - + A11 2024
+ AMD1 2019 + A1 2024
IEC 60999-1 1999 Connecting devices - Electrical copper EN 60999-1 2000
conductors - Safety requirements for screw-
type and screwless-type clamping units -
Part 1: General requirements and particular
requirements for clamping units for
conductors from 0,2 mm2 up to 35 mm2
(included)
IEC 61439-1 - Low-voltage switchgear and controlgear EN IEC 61439-1 -
assemblies - Part 1: General rules
IEC 61439-3 2012 Low-voltage switchgear and controlgear EN 61439-3 2012
assemblies - Part 3: Distribution boards
intended to be operated by ordinary
persons (DBO)
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

IEC 60269-3:2024 © IEC 2024 – 3 –
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

IEC 60269-3:2024 © IEC 2024 – 5 –
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

IEC 60269-3:2024 © IEC 2024 – 7 –
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 .
...