IEC 60269-3:2010

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

IEC 60269-3:2010 provides supplementary requirements for fuses for use by unskilled persons according to the following fuse systems comply with all subclauses of IEC 60269-1 and with the requirements laid down in the relevant fuse systems. This part is to be used in conjunction with IEC 60269-1, Low-voltage fuses - Part 1: General requirements. This Part 3 supplements or modifies the corresponding clauses or subclauses of Part 1.
This publication is to be read in conjunction with IEC 60269-1:2009.

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

La CEI 60269-3:2010 donne exigences supplémentaires pour les fusibles destinés à être utilisés par des personnes non qualifiées qui appartiennent aux systèmes de fusibles suivant répondent à l'ensemble des paragraphes de la CEI 60269-1, ainsi qu'aux exigences énoncées dans les systèmes de fusibles qui leur sont applicables. La présente partie doit être utilisée conjointement avec la CEI 60269-1, Fusibles basse tension - Partie 1: Exigences générales. Lorsqu'aucune modification n'est nécessaire, la Partie 3 indique que l'article ou le paragraphe approprié est applicable.
Cette publication doit être lue conjointement avec la CEI 60269-1:2009.

General Information

• Status: Published
• Publication Date: 11-May-2010
• ICS: 29.120.50 - Fuses and other overcurrent protection devices
• Technical Committee: SC 32B - Low-voltage fuses
• Drafting Committee: MT 8 - TC 32/SC 32B/MT 8
• Current Stage: DELPUB - Deleted Publication
• Start Date: 09-Aug-2024
• Completion Date: 31-Oct-2021

Relations

• Amended By: IEC 60269-3:2010/AMD2:2019 - Amendment 2 - 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
• Effective Date: 05-Sep-2023
• Amended By: IEC 60269-3:2010/AMD1:2013 - Amendment 1 - 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
• Effective Date: 05-Sep-2023
• Revised: IEC 60269-3:2024 - 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
• Effective Date: 05-Sep-2023
• Revises: IEC 60269-3:2006 - Low-voltage fuses - Part 3: Supplementary requirements for fuses for use by unskilled persons (fuses mainly for household and similar applications) - Examples of standardized systems of fuses A to F
• Effective Date: 05-Sep-2023

Overview

IEC 60269-3:2010 is an international standard published by the International Electrotechnical Commission (IEC) that defines supplementary requirements for low-voltage fuses designed specifically for use by unskilled persons. These fuses are primarily intended for household and similar applications, ensuring safe and effective protection of electrical circuits without requiring specialized knowledge to operate or replace them.

This standard serves as an extension of IEC 60269-1, which details general requirements for low-voltage fuses. IEC 60269-3 modifies and supplements various clauses of Part 1 to cater to the unique needs and safety considerations for fuse systems that are user-friendly for non-professionals. It includes examples of standardized fuse systems labeled A to F, providing clear guidance on fuse design, construction, ratings, and testing.

Key Topics

• Fuse Systems A to F: The standard presents detailed examples for multiple fuse systems (A through F), each with specific construction, characteristics, and application criteria tailored for household and similar environments.
• User Safety and Accessibility: Emphasizes ease of use by unskilled persons, including protective measures against electric shock and clear, standardized markings to inform users.
• Rated Voltage and Current: Defines the rated voltage levels and current ratings applicable to the fuse-links, fuse-holders, and gauge-pieces to ensure appropriate selection and compatibility.
• Time-Current Characteristics: Specifies limits and conventional values related to the trip behavior of fuse-links, ensuring reliable overload and short-circuit protection.
• Mechanical and Electrical Construction Requirements: Details the design rules for fuse components such as fuse-links, carriers, contacts, gauge-pieces, and bases to guarantee robustness, safety, and non-interchangeability where necessary.
• Insulation and Isolation: Requires verification of insulating properties and suitability for isolation to prevent electrical hazards during fuse operation or replacement.
• Testing and Verification Procedures: Outlines comprehensive testing methods covering temperature rise, power dissipation, breaking capacity, resistance to heat, mechanical strength, and overcurrent discrimination to validate fuse performance and safety under various conditions.
• Marking and Identification: Mandates clear markings on fuse parts including fuse-links and gauge-pieces to simplify correct usage by unskilled users.

Applications

IEC 60269-3:2010 applies primarily to fuses used in:

• Household Electrical Installations: Protecting low-voltage consumer circuits such as lighting and outlets where end users replace fuses independently.
• Small Commercial and Similar Premises: Environments resembling household electrical systems where specialized technical support might not be readily available.
• Consumer Appliances: Integration into devices requiring user-replaceable fuse protection that complies with recognized safety and performance standards.
• Electrical Safety Equipment: Providing a standardized approach for manufacturers to produce safe, easy-to-use fuses that prevent electrical fires and equipment damage caused by overloads or short circuits.

By adhering to IEC 60269-3, manufacturers ensure their fuses meet stringent safety and usability standards, enhancing consumer confidence and reducing risks in everyday electrical use.

Related Standards

• IEC 60269-1:2009 – Low-voltage fuses – Part 1: General requirements. This foundational document should be used in conjunction with Part 3, providing overall definitions, classifications, and general test procedures for low-voltage fuses.
• IEC 60269-2 – Covers supplementary requirements for cartridge fuses intended for industrial use, complementing Part 3’s focus on household fuses.
• IEC Electropedia – The IEC’s online electrotechnical dictionary offers definitions and terminology consistent with this standard.
• Safety Standards for Household Electrical Equipment – Other IEC and national standards may intersect with IEC 60269-3 in defining electrical safety criteria in consumer environments.

Conclusion

IEC 60269-3:2010 plays a critical role in ensuring low-voltage fuses designed for household and analogous applications meet both safety and user-friendly standards. It supports the manufacture and deployment of fuse systems that enable unskilled persons to safely operate and replace fuses, reducing electrical hazards and enhancing the overall safety of electrical installations for consumers worldwide.

Keywords: IEC 60269-3, low-voltage fuses, household fuses, fuse systems A to F, user-safe fuses, electrical safety, fuse standards, fuse testing, fuse ratings, fuse construction, unskilled users, IEC standards.

Standards Content (Sample)

IEC 60269-3 ®
Edition 4.0 2010-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Low-voltage fuses –
Part 3: Supplementary requirements for fuses for use by unskilled persons
(fuses mainly for household and 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
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IEC 60269-3 ®
Edition 4.0 2010-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Low-voltage fuses –
Part 3: Supplementary requirements for fuses for use by unskilled persons
(fuses mainly for household and 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
PRICE CODE
INTERNATIONALE
XG
CODE PRIX
ICS 29.120.50 ISBN 978-2-88910-088-0
– 2 – 60269-3 © IEC:2010
CONTENTS
FOREWORD.12
INTRODUCTION.14
1 General scope .15
1.2 Normative references .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.17
5.6.3 Gates .18
5.7 Breaking range and breaking capacity.18
5.7.2 Rated breaking capacity .18
6 Markings .18
6.4 Marking of the gauge-pieces .18
7 Standard conditions for construction.19
7.1 Mechanical design.19
7.1.2 Connections including terminals .19
7.1.3 Fuse-contacts.19
7.1.4 Construction of a gauge-piece .19
7.1.6 Construction of a fuse-carrier .20
7.1.7 Construction of a fuse-link .20
7.1.8 Non-interchangeability.20
7.1.9 Construction of a fuse-base.21
7.2 Insulating properties and suitability for isolation .21
7.3 Temperature rise, power dissipation of the fuse-link and acceptable power
dissipation of the fuse-holder.22
7.7 I t characteristics .22
7.7.1 Pre-arcing I t values.22
7.7.2 Operating I t values.23
7.8 Overcurrent discrimination of "gG" fuse-links.23
7.9 Protection against electric shock .23
8 Tests .23
8.1.4 Arrangement of the fuse and dimensions .24
8.2 Verification of the insulating properties and the suitability for isolation .25

60269-3 © IEC:2010 – 3 –
8.2.1 Arrangement of the fuse-holder .25
8.2.6 Creepage distances, clearances and distances through sealing
compound.25
8.3 Verification of temperature rise and power dissipation.25
8.3.1 Arrangement of the fuse .25
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 .27
8.5.8 Acceptability of test results.27
8.7.4 Verification of overcurrent discrimination .27
8.9 Verification of resistance to heat .28
8.9.1 Fuse-base .28
8.9.2 Fuse-carrier.29
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.31
8.11.1 Mechanical strength .31

Annex AA (informative) Special test for cable overload protection (for fuse system A).66

Fuse system B – Cylindrical fuses (NF cylindrical fuse system).67
1 General .67
1.1 Scope.67
2 Terms and definitions .67
3 Conditions for operation in service.67
4 Classification.68
5 Characteristics of fuses .68
5.2 Rated voltage.68
5.3.1 Rated current of the fuse-link.68
5.3.2 Rated current of the fuse-holder .68
5.5 Rated power dissipation of a fuse-link and rated acceptable power
dissipation of a fuse-holder .68
5.6.2 Conventional times and currents.68
5.6.3 Gates .69
5.7.2 Rated breaking capacity .69
6 Markings .69
7 Standard conditions for construction.69
7.1 Mechanical design.69
7.1.2 Connections including terminals .69
7.1.6 Construction of a fuse-carrier .70
7.1.7 Construction of a fuse-link .70
7.1.8 Non-interchangeability.70
7.1.9 Construction of a fuse-base.70
7.2 Insulating properties and suitability for isolation .71

– 4 – 60269-3 © IEC:2010
7.3 Temperature rise, power dissipation of the fuse-link and acceptable power
dissipation of the fuse-holder.72
7.7 I t characteristics .72
7.7.1 Pre-arcing I t values.72
7.7.2 Operating I t values.72
7.8 Overcurrent discrimination of "gG" fuse-links.72
7.9 Protection against electric shock .72
8 Tests .73
8.1.6 Testing of fuse-holders .73
8.3.1 Arrangement of the fuse .73
8.3.3 Measurement of the power dissipation of the fuse-link.74
8.4 Verification of operation .75
8.4.1 Arrangement of the fuse .75
8.5 Verification of the breaking capacity .75
8.5.1 Arrangement of the fuse .75
8.5.5 Test method .76
8.5.8 Acceptability of test results.76
8.7.4 Verification of overcurrent discrimination .76
8.8 Verification of the degree of protection of enclosures .76
8.8.1 Verification of protection against electric shock .76
8.9 Verification of resistance to heat .76
8.10 Verification of non-deterioration of contacts.77
8.10.1 Arrangement of the fuse .77
8.10.2 Test method .77
8.10.3 Acceptability of test results.77
8.12 Verification of the reliability of terminals .81

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.91
5.7.2 Rated breaking capacity .91
6 Markings .92
7 Standard conditions for construction.92

60269-3 © IEC:2010 – 5 –
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 .92
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 .93
8.4.1 Arrangement of fuse .93
8.5 Verification of breaking capacity.93
8.5.1 Arrangement of the fuse .93
8.5.2 Characteristics of the test circuit.93
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.94

Fuse system D – Cylindrical fuses (Italian cylindrical fuse 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
5.3.1 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 Limits of time-current characteristics .106
5.6.1 Time-current characteristics, time-current zones and overload curves .106
5.6.2 Conventional times and currents.106
5.6.3 Gates .106
5.7.2 Rated breaking capacity .106
6 Markings .107
7 Standard conditions for construction.107
7.1 Mechanical design.107

– 6 – 60269-3 © IEC:2010
7.1.2 Connections including terminals .107
7.1.6 Construction of a fuse-carrier .107
7.1.7 Construction of a fuse-link .107
7.1.8 Non-interchangeability.108
7.1.9 Construction of a fuse-base.108
7.2 Insulating properties and suitability for isolation .108
7.3 Temperature rise, power dissipation of the fuse-link and acceptable power
dissipation of the fuse-holder.109
7.7 I t characteristics .109
7.7.1 Minimum pre-arcing I t values at 0,01 s.109
7.7.2 Maximum operating I t values at 0,01 s .110
7.9 Protection against electric shock .110
8 Tests .110
8.1.6 Testing of the fuse-holder.110
8.3 Verification of temperature rise and power dissipation. 111
8.3.1 Arrangement of the fuse .111
8.3.3 Measurement of the power dissipation of the fuse-link. 111
8.4 Verification of operation . 112
8.4.1 Arrangement of the fuse .112
8.5 Verification of the breaking capacity .112
8.5.1 Arrangement of the fuse .112
8.5.5 Test method .112
8.5.8 Acceptability of test results.112
8.7.4 Verification of discrimination.112
8.9 Verification of resistance to heat .112
8.9.1 Test in heating cabinet .112
8.9.2 Ball-pressure test .113
8.10 Verification of non-deterioration of contacts. 113
8.10.1 Arrangement of the fuse .113
8.10.2 Test method .113
8.10.3 Acceptability of test results.114
8.11 Mechanical and miscellaneous tests.114

Fuse system E – Pin-type fuses .124
1 General .124
1.1 Scope.124
2 Terms and definitions .124
2.3 Characteristic quantities .124
3 Conditions for operation in service.125
4 Classification.125
5 Characteristics of fuses .125
5.3.3 Rated current of the gauge-piece.125
5.5 Rated power dissipation of the fuse-link .125
5.6 Limits of time-current characteristics .125
5.6.2 Conventional times and currents.125
5.6.3 Gates .125
5.7.2 Rated breaking capacity .126
6 Markings .126

60269-3 © IEC:2010 – 7 –
6.1 Markings of fuse-holders .126
6.2 Markings of fuse-links.126
6.4 Markings of the gauge-pieces.126
7 Standard conditions for construction.126
7.1.4 Construction of the gauge-piece .126
7.1.6 Construction of a fuse-carrier .126
7.1.7 Construction of a fuse-link .127
7.1.8 Non-interchangeability.127
7.1.9 Construction of a fuse-base.127
7.3 Temperature rise, power dissipation of the fuse-link and acceptable power
dissipation of the fuse-holder.127
7.9 Protection against electric shock .128
8 Tests .128
8.3 Verification of temperature rise and power dissipation. 128
8.3.1 Arrangement of the fuse .128
8.3.3 Measurement of the power dissipation of the fuse-link. 128
8.3.4 Test method .129
8.5.5 Test method .130
8.10 Verification of non-deterioration of contacts. 130
8.10.1 Arrangement of the fuse .130
8.10.2 Test method .130
8.10.3 Acceptability of test results.131

Fuse system F – Cylindrical fuse-links for use in plugs (BS plugtop system) .137
1 General .137
1.1 Scope.137
2 Terms and definitions .137
3 Conditions for operation in service.137
4 Classification.137
5 Characteristics of fuses .137
5.2 Rated voltage.137
5.3.1 Rated current of the fuse-link.138
5.3.2 Rated current of the fuse-holder .138
5.5 Rated power dissipation of a fuse-link and rated acceptable power
dissipation of a fuse-holder .138
5.6.1 Time-current characteristics, time-current zones and overload curves .138
5.6.2 Conventional times and currents.138
5.6.3 Gates .138
5.7.2 Rated breaking capacity .138
6 Markings .138
7 Standard conditions for construction.139
7.1.7 Construction of a fuse-link .139
7.1.8 Non-interchangeability.139
7.2 Insulating properties and suitability for isolation .139
7.3 Temperature rise, power dissipation of the fuse-link and acceptable power
dissipation of the fuse-holder.139
7.7 I t characteristics .139
7.7.1 Pre-arcing I t values.139

– 8 – 60269-3 © IEC:2010
7.9 Protection against electric shock .139
8 Tests .140
8.1.4 Arrangement of the fuse-link for tests . 140
8.1.5 Testing of fuse-links .140
8.2.4 Acceptability of test results.141
8.3 Verification of temperature rise and power dissipation. 142
8.3.1 Arrangement of the fuse .142
8.3.4 Test method .142
8.3.5 Acceptability of test results.142
8.4 Verification of operation . 142
8.4.1 Arrangement of the fuse .142
8.5 Breaking-capacity tests .143
8.5.1 Arrangement of the fuse .143
8.5.2 Characteristics of the test circuit.143
8.5.4 Calibration of the test circuit .143
8.5.5 Test method .143
8.5.8 Acceptability of test results.143
8.7 Verification of I t characteristics and overcurrent discrimination . 144
8.7.3 Verification of compliance for fuse-links at 0,01 s . 144
8.10 Verification of non-deterioration of contacts. 144
8.11.1 Mechanical strength .144
Annex BB (informative) (for all fuse systems) – Alternative tests for tests No. 1 and No.
2 of Table 20 of IEC 60269-1 .150
Annex CC (informative) Recommendations for future designs of fuses (for all fuse
systems) .152
Bibliography.153

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.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 for the voltage drop (B, C) or the temperature rise (A, D).43
Figure 110 – Fuse-link, D-type. Sizes D01-D03.44
Figure 111 – Fuse-link, D-type. Sizes DII-DIV .45
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 .52
Figure 118 – Fuse-base, D-type. Sizes D01-D03 .54

60269-3 © IEC:2010 – 9 –
Figure 119 – Fuse-base, D-type. Sizes DII-DIV.55
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 .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 .64
Figure 125 – Gauges C 17 for concentricity of fuse-bases .65
Figure 201 – Fuse-link .82
Figure 202 – Dummy fuse-link .83
Figure 203 – Test-rig and ferrules for the measurement of the voltage drop and the
verification of operating characteristics of the cartridge.84
Figure 204 – Fuse-base, A-type and B-type .
...

IEC 60269-3 ®
Edition 4.1 2013-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Low-voltage fuses –
Part 3: Supplementary requirements for fuses for use by unskilled persons
(fuses mainly for household and 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
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IEC 60269-3 ®
Edition 4.1 2013-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Low-voltage fuses –
Part 3: Supplementary requirements for fuses for use by unskilled persons

(fuses mainly for household and 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 978-2-8322-0633-1

– 2 – 60269-3  IEC:2010+A1:2013
CONTENTS
FOREWORD . 12
INTRODUCTION . 14
1 General scope . 15
1.2 Normative references . 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 . 17
5.6.3 Gates . 18
5.7 Breaking range and breaking capacity . 18
5.7.2 Rated breaking capacity . 18
6 Markings . 18
6.4 Marking of the gauge-pieces . 18
7 Standard conditions for construction . 19
7.1 Mechanical design . 19
7.1.2 Connections including terminals . 19
7.1.3 Fuse-contacts . 19
7.1.4 Construction of a gauge-piece . 19
7.1.6 Construction of a fuse-carrier . 20
7.1.7 Construction of a fuse-link . 20
7.1.8 Non-interchangeability . 20
7.1.9 Construction of a fuse-base . 21
7.2 Insulating properties and suitability for isolation . 21
7.3 Temperature rise, power dissipation of the fuse-link and acceptable power
dissipation of the fuse-holder. 22
7.7 I t characteristics . 22
7.7.1 Pre-arcing I t values . 22
7.7.2 Operating I t values . 23
7.8 Overcurrent discrimination of "gG" fuse-links . 23
7.9 Protection against electric shock . 23
8 Tests . 24
8.1.4 Arrangement of the fuse and dimensions . 24
8.2 Verification of the insulating properties and the suitability for isolation . 25

60269-3  IEC:2010+A1:2013 – 3 –
8.2.1 Arrangement of the fuse-holder . 25
8.2.6 Creepage distances, clearances and distances through sealing
compound. 25
8.3 Verification of temperature rise and power dissipation . 25
8.3.1 Arrangement of the fuse . 25
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 . 27
8.5.8 Acceptability of test results . 27
8.7.4 Verification of overcurrent discrimination . 27
8.9 Verification of resistance to heat . 28
8.9.1 Fuse-base . 28
8.9.2 Fuse-carrier . 29
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 . 31
8.11.1 Mechanical strength . 31

Annex AA (informative) Special test for cable overload protection (for fuse system A) . 70

Fuse system B – Cylindrical fuses (NF cylindrical fuse system). 71
1 General . 71
1.1 Scope . 71
2 Terms and definitions . 71
3 Conditions for operation in service. 71
4 Classification . 72
5 Characteristics of fuses . 72
5.2 Rated voltage . 72
5.3.1 Rated current of the fuse-link. 72
5.3.2 Rated current of the fuse-holder . 72
5.5 Rated power dissipation of a fuse-link and rated acceptable power
dissipation of a fuse-holder . 72
5.6.2 Conventional times and currents . 72
5.6.3 Gates . 73
5.7.2 Rated breaking capacity . 73
6 Markings . 73
7 Standard conditions for construction . 73
7.1 Mechanical design . 73
7.1.2 Connections including terminals . 73
7.1.6 Construction of a fuse-carrier . 74
7.1.7 Construction of a fuse-link . 74
7.1.8 Non-interchangeability . 74
7.1.9 Construction of a fuse-base . 74
7.2 Insulating properties and suitability for isolation . 75

– 4 – 60269-3  IEC:2010+A1:2013
7.3 Temperature rise, power dissipation of the fuse-link and acceptable power
dissipation of the fuse-holder. 76
7.7 I t characteristics . 76
7.7.1 Pre-arcing I t values . 76
7.7.2 Operating I t values . 76
7.8 Overcurrent discrimination of "gG" fuse-links . 76
7.9 Protection against electric shock . 76
8 Tests . 77
8.1.6 Testing of fuse-holders . 77
8.3.1 Arrangement of the fuse . 77
8.3.3 Measurement of the power dissipation of the fuse-link . 78
8.4 Verification of operation . 79
8.4.1 Arrangement of the fuse . 79
8.5 Verification of the breaking capacity . 79
8.5.1 Arrangement of the fuse . 79
8.5.5 Test method . 80
8.5.8 Acceptability of test results . 80
8.7.4 Verification of overcurrent discrimination . 80
8.8 Verification of the degree of protection of enclosures . 80
8.8.1 Verification of protection against electric shock . 80
8.9 Verification of resistance to heat . 80
8.10 Verification of non-deterioration of contacts . 81
8.10.1 Arrangement of the fuse . 81
8.10.2 Test method . 81
8.10.3 Acceptability of test results . 81
8.12 Verification of the reliability of terminals . 85

Fuse system C – Cylindrical fuses (BS cylindrical fuse system) . 94
1 General . 94
1.1 Scope . 94
2 Terms and definitions . 94
3 Conditions for operation in service. 94
4 Classification . 94
5 Characteristics of fuses . 95
5.2 Rated Voltage . 95
5.3 Rated current . 95
5.3.1 Rated current of the fuse-link. 95
5.3.2 Rated current of the fuse-holder . 95
5.5 Rated power dissipation of a fuse-link and rated acceptable power
dissipation of a fuse-holder . 95
5.6 Limits of time-current characteristics . 95
5.6.1 Time-current characteristics, time-current curves and overload
curves . 95
5.6.2 Conventional times and currents . 95
5.7 Breaking range and breaking capacity . 95
5.7.2 Rated breaking capacity . 95
6 Markings . 96
7 Standard conditions for construction . 96

60269-3  IEC:2010+A1:2013 – 5 –
7.1 Mechanical design . 96
7.1.2 Connections including terminals . 96
7.1.6 Construction of a fuse-carrier . 96
7.1.7 Construction of a fuse-link . 96
7.1.8 Non-interchangeability . 96
7.1.9 Construction of a fuse-base . 96
7.2 Insulating properties and suitability for isolation . 96
7.3 Temperature rise, power dissipation of the fuse-link and acceptable power
dissipation of the fuse-holder. 97
7.7 I t characteristics . 97
7.9 Protection against electric shock . 97
8 Tests . 97
8.1 General . 97
8.1.4 Arrangement of the fuse . 97
8.3 Verification of temperature rise and power dissipation . 97
8.3.1 Arrangement of the fuse . 97
8.3.3 Measurement of the power dissipation of the fuse-link . 97
8.4 Verification of operation . 97
8.4.1 Arrangement of fuse . 97
8.5 Verification of breaking capacity . 97
8.5.1 Arrangement of the fuse . 97
8.5.2 Characteristics of the test circuit . 97
8.5.5 Test method . 98
8.5.8 Acceptability of test results . 98
8.10 Verification of non-deterioration of contacts . 98
8.10.1 Arrangement of the fuse . 98
8.10.2 Test method . 98
8.10.3 Acceptability of test results . 98

Fuse system D – Cylindrical fuses (Italian cylindrical fuse system) . 108
1 General . 108
1.1 Scope . 108
2 Terms and definitions . 108
3 Conditions for operation in service. 108
4 Classification . 108
5 Characteristics of fuses . 108
5.3.1 Rated current of the fuse-link. 108
5.3.2 Rated current of the fuse-holder . 109
5.5 Rated power dissipation of a fuse-link and rated acceptable power
dissipation of a fuse-holder . 109
5.6 Limits of time-current characteristics . 110
5.6.1 Time-current characteristics, time-current zones and overload curves . 110
5.6.2 Conventional times and currents . 110
5.6.3 Gates . 110
5.7.2 Rated breaking capacity . 110
6 Markings . 111
7 Standard conditions for construction . 111
7.1 Mechanical design . 111

– 6 – 60269-3  IEC:2010+A1:2013
7.1.2 Connections including terminals . 111
7.1.6 Construction of a fuse-carrier . 111
7.1.7 Construction of a fuse-link . 111
7.1.8 Non-interchangeability . 112
7.1.9 Construction of a fuse-base . 112
7.2 Insulating properties and suitability for isolation . 112
7.3 Temperature rise, power dissipation of the fuse-link and acceptable power
dissipation of the fuse-holder. 113
7.7 I t characteristics . 113
7.7.1 Minimum pre-arcing I t values at 0,01 s . 113
7.7.2 Maximum operating I t values at 0,01 s . 114
7.9 Protection against electric shock . 114
8 Tests . 114
8.1.6 Testing of the fuse-holder . 114
8.3 Verification of temperature rise and power dissipation . 115
8.3.1 Arrangement of the fuse . 115
8.3.3 Measurement of the power dissipation of the fuse-link . 115
8.4 Verification of operation . 116
8.4.1 Arrangement of the fuse . 116
8.5 Verification of the breaking capacity . 116
8.5.1 Arrangement of the fuse . 116
8.5.5 Test method . 116
8.5.8 Acceptability of test results . 116
8.7.4 Verification of discrimination . 116
8.9 Verification of resistance to heat . 116
8.9.1 Test in heating cabinet . 116
8.9.2 Ball-pressure test . 117
8.10 Verification of non-deterioration of contacts . 117
8.10.1 Arrangement of the fuse . 117
8.10.2 Test method . 117
8.10.3 Acceptability of test results . 118
8.11 Mechanical and miscellaneous tests . 118

Fuse system E – Pin-type fuses . 128
1 General . 128
1.1 Scope . 128
2 Terms and definitions . 128
2.3 Characteristic quantities . 128
3 Conditions for operation in service. 129
4 Classification . 129
5 Characteristics of fuses . 129
5.3.3 Rated current of the gauge-piece . 129
5.5 Rated power dissipation of the fuse-link . 129
5.6 Limits of time-current characteristics . 129
5.6.2 Conventional times and currents . 129
5.6.3 Gates . 129
5.7.2 Rated breaking capacity . 130
6 Markings . 130

60269-3  IEC:2010+A1:2013 – 7 –
6.1 Markings of fuse-holders . 130
6.2 Markings of fuse-links. 130
6.4 Markings of the gauge-pieces . 130
7 Standard conditions for construction . 130
7.1.4 Construction of the gauge-piece . 130
7.1.6 Construction of a fuse-carrier . 130
7.1.7 Construction of a fuse-link . 131
7.1.8 Non-interchangeability . 131
7.1.9 Construction of a fuse-base . 131
7.3 Temperature rise, power dissipation of the fuse-link and acceptable power
dissipation of the fuse-holder. 131
7.9 Protection against electric shock . 132
8 Tests . 132
8.3 Verification of temperature rise and power dissipation . 132
8.3.1 Arrangement of the fuse . 132
8.3.3 Measurement of the power dissipation of the fuse-link . 132
8.3.4 Test method . 133
8.5.5 Test method . 134
8.10 Verification of non-deterioration of contacts . 134
8.10.1 Arrangement of the fuse . 134
8.10.2 Test method . 134
8.10.3 Acceptability of test results . 135

Fuse system F – Cylindrical fuse-links for use in plugs (BS plugtop system) . 141
1 General . 141
1.1 Scope . 141
2 Terms and definitions . 141
3 Conditions for operation in service. 141
4 Classification . 141
5 Characteristics of fuses . 141
5.2 Rated voltage . 141
5.3.1 Rated current of the fuse-link. 142
5.3.2 Rated current of the fuse-holder . 142
5.5 Rated power dissipation of a fuse-link and rated acceptable power
dissipation of a fuse-holder . 142
5.6.1 Time-current characteristics, time-current zones and overload curves . 142
5.6.2 Conventional times and currents . 142
5.6.3 Gates . 142
5.7.2 Rated breaking capacity . 142
6 Markings . 142
7 Standard conditions for construction . 143
7.1.7 Construction of a fuse-link . 143
7.1.8 Non-interchangeability . 143
7.2 Insulating properties and suitability for isolation . 143
7.3 Temperature rise, power dissipation of the fuse-link and acceptable power
dissipation of the fuse-holder. 143
7.7 I t characteristics . 143
7.7.1 Pre-arcing I t values . 143

– 8 – 60269-3  IEC:2010+A1:2013
7.9 Protection against electric shock . 143
8 Tests . 144
8.1.4 Arrangement of the fuse-link for tests . 144
8.1.5 Testing of fuse-links . 144
8.2.4 Acceptability of test results . 145
8.3 Verification of temperature rise and power dissipation . 146
8.3.1 Arrangement of the fuse . 146
8.3.4 Test method . 146
8.3.5 Acceptability of test results . 146
8.4 Verification of operation . 146
8.4.1 Arrangement of the fuse . 146
8.5 Breaking-capacity tests . 147
8.5.1 Arrangement of the fuse . 147
8.5.2 Characteristics of the test circuit . 147
8.5.4 Calibration of the test circuit . 147
8.5.5 Test method . 147
8.5.8 Acceptability of test results . 147
8.7 Verification of I t characteristics and overcurrent discrimination . 148
8.7.3 Verification of compliance for fuse-links at 0,01 s . 148
8.10 Verification of non-deterioration of contacts . 148
8.11.1 Mechanical strength . 148
Annex BB (informative) (for all fuse systems) – Alternative tests for tests No. 1 and No.
2 of Table 20 of IEC 60269-1 . 154
Annex CC (informative) Recommendations for future designs of fuses (for all fuse
systems) . 156
Bibliography . 157

Figure 101 – Time-current zones for "gG" fuse-links . 36
Figure 102 – Time-current zones for "gG" fuse-links . 38
Figure 103 – Time-current zone for "gG" fuse-links 13 A and 32 A . 40
Figure 104 – Dummy fuse-links according to 8.3 and 8.9.1.1 . 41
Figure 105 – Test rigs for fuse-links . 42
Figure 106 – Test rigs for fuse-links . 43
Figure 107 – Test arrangement for fuse-bases according to 8.9.1.2 . 44
Figure 108 – Example of a torque wrench according to 8.9.2 . 45
Figure 109 – Measuring points for the voltage drop (B, C) or the temperature rise (A, D) . 46
Figure 110 – Fuse-link, D-type. Sizes D01-D03 . 47
Figure 111 – Fuse-link, D-type. Sizes DII-DIV . 48
Figure 112 – Fuse-carrier, D-type. Sizes D01-D03 . 50
Figure 113 – Fuse-carrier, D-type. Sizes DII-DIII . 51
Figure 114 – Fuse-carrier, D-type. Size DIV . 52
Figure 115 – Edison thread for D-type fuses; limit dimensions . 53
Figure 116 – Gauges for Edison thread for D-type fuses for screwed shells of fuse-
carrier go ring gauges . 54
Figure 117 – Gauges for Edison thread, D-type fuses, go and not-go plug gauges for
screwed shells of fuse-bases . 55
Figure 118 – Fuse-base, D-type. Sizes D01-D03 . 57

60269-3  IEC:2010+A1:2013 – 9 –
Figure 119 – Fuse-base, D-type. Sizes DII-DIV . 58
Figure 120 – Fuse-base, D-type for push-in gauge pieces. Size DII-DIII. 60
Figure 121 – Gauge-piece and hand-key, D-type. Sizes D01-D03 . 62
Figure 122 – Gauge-piece and hand-key, D-type. Sizes DII-DIV . 63
Figure 123 – Gauge-piece and hand-key, D-type push-in gauge rings. Size DII-DIII . 65
Figure 124 – Whitworth thread W 3/16 for screw-in gauge rings and corresponding
fuse-bases of sizes DII and DIII . 67
Figure 125 – Gauges C 17 for concentricity of
...

IEC 60269-3 ®
Edition 4.2 2019-06
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Low-voltage fuses –
Part 3: Supplementary requirements for fuses for use by unskilled persons
(fuses mainly for household and 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.

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite
ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie
et les microfilms, sans l'accord écrit de l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des
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 Central Office Tel.: [phone]
3, rue de Varembé [e-mail]
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 Electropedia - www.electropedia.org
The advanced search enables to find IEC publications by a The world's leading online dictionary on electrotechnology,
variety of criteria (reference number, text, technical containing more than 22 000 terminological entries in English
committee,…). It also gives information on projects, replaced and French, with equivalent terms in 16 additional languages.
and withdrawn publications. Also known as the International Electrotechnical Vocabulary

(IEV) online.
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La Commission Electrotechnique Internationale (IEC) est la première organisation mondiale qui élabore et publie des
Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.

A propos des publications IEC
Le contenu technique des publications IEC est constamment revu. Veuillez vous assurer que vous possédez l’édition la
plus récente, un corrigendum ou amendement peut avoir été publié.

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La recherche avancée permet de trouver des publications IEC monde, avec plus de 22 000 articles terminologiques en
en utilisant différents critères (numéro de référence, texte, anglais et en français, ainsi que les termes équivalents dans
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projets et les publications remplacées ou retirées. Electrotechnique International (IEV) en ligne.

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Restez informé sur les nouvelles publications IEC. Just 67 000 entrées terminologiques électrotechniques, en anglais
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Service Clients - webstore.iec.ch/csc CISPR de l'IEC.

Si vous désirez nous donner des commentaires sur cette
publication ou si vous avez des questions contactez-nous:
[e-mail].
IEC 60269-3 ®
Edition 4.2 2019-06
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Low-voltage fuses –
Part 3: Supplementary requirements for fuses for use by unskilled persons

(fuses mainly for household and 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 978-2-8322-7048-6

IEC 60269-3 ®
Edition 4.2 2019-06
CONSOLIDATED VERSION
REDLINE VERSION
VERSION REDLINE
colour
inside
Low-voltage fuses –
Part 3: Supplementary requirements for fuses for use by unskilled persons
(fuses mainly for household and 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

– 2 – IEC 60269-3:2010+AMD1:2013
+AMD2:2019  IEC 2019
CONTENTS
INTRODUCTION .
FOREWORD . 12
1 General scope . 16
1.2 Normative references . 16

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
6.4 Marking of the gauge-pieces . 19
7 Standard conditions for construction . 20
7.1 Mechanical design . 20
7.1.2 Connections including terminals . 20
7.1.3 Fuse-contacts . 20
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 . 21
7.1.8 Non-interchangeability . 22
7.1.9 Construction of a fuse-base . 22
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. 23
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 . 24
8 Tests . 25
8.1.4 Arrangement of the fuse and dimensions . 25

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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. 26
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 . 28
8.5.8 Acceptability of test results . 28
8.7.4 Verification of overcurrent discrimination . 29
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 . 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 . 32
8.11.1 Mechanical strength . 32

Annex AA (informative) Special test for cable overload protection (for fuse system A) . 77

Fuse system B – Cylindrical fuses (NF cylindrical fuse system). 78
1 General . 78
1.1 Scope . 78
2 Terms and definitions . 78
3 Conditions for operation in service. 78
4 Classification . 79
5 Characteristics of fuses . 79
5.2 Rated voltage . 79
5.3.1 Rated current of the fuse-link. 79
5.3.2 Rated current of the fuse-holder . 79
5.5 Rated power dissipation of a fuse-link and rated acceptable power
dissipation of a fuse-holder . 79
5.6.2 Conventional times and currents . 79
5.6.3 Gates . 80
5.7.2 Rated breaking capacity . 80
6 Markings . 80
7 Standard conditions for construction . 80
7.1 Mechanical design . 80
7.1.2 Connections including terminals . 80
7.1.6 Construction of a fuse-carrier . 81
7.1.7 Construction of a fuse-link . 81
7.1.8 Non-interchangeability . 81
7.1.9 Construction of a fuse-base . 81
7.2 Insulating properties and suitability for isolation . 82

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7.3 Temperature rise, power dissipation of the fuse-link and acceptable power
dissipation of the fuse-holder. 83
7.7 I t characteristics . 83
7.7.1 Pre-arcing I t values . 83
7.7.2 Operating I t values . 83
7.8 Overcurrent discrimination of "gG" fuse-links . 83
7.9 Protection against electric shock . 83
8 Tests . 84
8.1.6 Testing of fuse-holders . 84
8.3.1 Arrangement of the fuse . 84
8.3.3 Measurement of the power dissipation of the fuse-link . 85
8.4 Verification of operation . 86
8.4.1 Arrangement of the fuse . 86
8.5 Verification of the breaking capacity . 86
8.5.1 Arrangement of the fuse . 86
8.5.5 Test method . 87
8.5.8 Acceptability of test results . 87
8.7.4 Verification of overcurrent discrimination . 87
8.8 Verification of the degree of protection of enclosures . 87
8.8.1 Verification of protection against electric shock . 87
8.9 Verification of resistance to heat . 87
8.10 Verification of non-deterioration of contacts . 88
8.10.1 Arrangement of the fuse . 88
8.10.2 Test method . 88
8.10.3 Acceptability of test results . 88
8.12 Verification of the reliability of terminals . 92

Fuse system C – Cylindrical fuses (BS cylindrical fuse system) . 101
1 General . 101
1.1 Scope . 101
2 Terms and definitions . 101
3 Conditions for operation in service. 101
4 Classification . 101
5 Characteristics of fuses . 102
5.2 Rated Voltage . 102
5.3 Rated current . 102
5.3.1 Rated current of the fuse-link. 102
5.3.2 Rated current of the fuse-holder . 102
5.5 Rated power dissipation of a fuse-link and rated acceptable power
dissipation of a fuse-holder . 102
5.6 Limits of time-current characteristics . 102
5.6.1 Time-current characteristics, time-current curves and overload
curves . 102
5.6.2 Conventional times and currents . 102
5.7 Breaking range and breaking capacity . 102
5.7.2 Rated breaking capacity . 102
6 Markings . 103
7 Standard conditions for construction . 103

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7.1 Mechanical design . 103
7.1.2 Connections including terminals . 103
7.1.6 Construction of a fuse-carrier . 103
7.1.7 Construction of a fuse-link . 103
7.1.8 Non-interchangeability . 103
7.1.9 Construction of a fuse-base . 103
7.2 Insulating properties and suitability for isolation . 103
7.3 Temperature rise, power dissipation of the fuse-link and acceptable power
dissipation of the fuse-holder. 104
7.7 I t characteristics . 104
7.9 Protection against electric shock . 104
8 Tests . 104
8.1 General . 104
8.1.4 Arrangement of the fuse . 104
8.3 Verification of temperature rise and power dissipation . 104
8.3.1 Arrangement of the fuse . 104
8.3.3 Measurement of the power dissipation of the fuse-link . 104
8.4 Verification of operation . 104
8.4.1 Arrangement of fuse . 104
8.5 Verification of breaking capacity . 104
8.5.1 Arrangement of the fuse . 104
8.5.2 Characteristics of the test circuit . 104
8.5.5 Test method . 105
8.5.8 Acceptability of test results . 105
8.10 Verification of non-deterioration of contacts . 105
8.10.1 Arrangement of the fuse . 105
8.10.2 Test method . 105
8.10.3 Acceptability of test results . 105

Fuse system D – Cylindrical fuses (Italian cylindrical fuse system) .
1 General .
1.1 Scope .
2 Terms and definitions .
3 Conditions for operation in service.
4 Classification .
5 Characteristics of fuses .
5.3.1 Rated current of the fuse-link.
5.3.2 Rated current of the fuse-holder .
5.5 Rated power dissipation of a fuse-link and rated acceptable power
dissipation of a fuse-holder .
5.6 Limits of time-current characteristics .
5.6.1 Time-current characteristics, time-current zones and overload curves .
5.6.2 Conventional times and currents .
5.6.3 Gates .
5.7.2 Rated breaking capacity .
6 Markings .
7 Standard conditions for construction .
7.1 Mechanical design .

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7.1.2 Connections including terminals .
7.1.6 Construction of a fuse-carrier .
7.1.7 Construction of a fuse-link .
7.1.8 Non-interchangeability .
7.1.9 Construction of a fuse-base .
7.2 Insulating properties and suitability for isolation .
7.3 Temperature rise, power dissipation of the fuse-link and acceptable power
dissipation of the fuse-holder.
7.7 I t characteristics .
7.7.1 Minimum pre-arcing I t values at 0,01 s .
7.7.2 Maximum operating I t values at 0,01 s .
7.9 Protection against electric shock .
8 Tests .
8.1.6 Testing of the fuse-holder .
8.3 Verification of temperature rise and power dissipation .
8.3.1 Arrangement of the fuse .
8.3.3 Measurement of the power dissipation of the fuse-link .
8.4 Verification of operation .
8.4.1 Arrangement of the fuse .
8.5 Verification of the breaking capacity .
8.5.1 Arrangement of the fuse .
8.5.5 Test method .
8.5.8 Acceptability of test results .
8.7.4 Verification of discrimination .
8.9 Verification of resistance to heat .
8.9.1 Test in heating cabinet .
8.9.2 Ball-pressure test .
8.10 Verification of non-deterioration of contacts .
8.10.1 Arrangement of the fuse .
8.10.2 Test method .
8.10.3 Acceptability of test results .
8.11 Mechanical and miscellaneous tests .

Fuse system E – Pin-type fuses .
1 General .
1.1 Scope .
2 Terms and definitions .
2.3 Characteristic quantities .
3 Conditions for operation in service.
4 Classification .
5 Characteristics of fuses .
5.3.3 Rated current of the gauge-piece .
5.5 Rated power dissipation of the fuse-link .
5.6 Limits of time-current characteristics .
5.6.2 Conventional times and currents .
5.6.3 Gates .
5.7.2 Rated breaking capacity .
6 Markings .

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6.1 Markings of fuse-holders .
6.2 Markings of fuse-links.
6.4 Markings of the gauge-pieces .
7 Standard conditions for construction .
7.1.4 Construction of the gauge-piece .
7.1.6 Construction of a fuse-carrier .
7.1.7 Construction of a fuse-link .
7.1.8 Non-interchangeability .
7.1.9 Construction of a fuse-base .
7.3 Temperature rise, power dissipation of the fuse-link and acceptable power
dissipation of the fuse-holder.
7.9 Protection against electric shock .
8 Tests .
8.3 Verification of temperature rise and power dissipation .
8.3.1 Arrangement of the fuse .
8.3.3 Measurement of the power dissipation of the fuse-link .
8.3.4 Test method .
8.5.5 Test method .
8.10 Verification of non-deterioration of contacts .
8.10.1 Arrangement of the fuse .
8.10.2 Test method .
8.10.3 Acceptability of test results .

Fuse system F – Cylindrical fuse-links for use in plugs (BS plugtop system) . 148
1 General . 148
1.1 Scope . 148
2 Terms and definitions . 148
3 Conditions for operation in service. 148
4 Classification . 148
5 Characteristics of fuses . 148
5.2 Rated voltage . 148
5.3.1 Rated current of the fuse-link. 149
5.3.2 Rated current of the fuse-holder . 149
5.5 Rated power dissipation of a fuse-link and rated acceptable power
dissipation of a fuse-holder . 149
5.6.1 Time-current characteristics, time-current zones and overload curves . 149
5.6.2 Conventional times and currents . 149
5.6.3 Gates . 149
5.7.2 Rated breaking capacity . 149
6 Markings . 149
7 Standard conditions for construction . 150
7.1.7 Construction of a fuse-link . 150
7.1.8 Non-interchangeability . 150
7.2 Insulating properties and suitability for isolation . 150
7.3 Temperature rise, power dissipation of the fuse-link and acceptable power

dissipation of the fuse-holder. 150
7.7 I t characteristics . 150
7.7.1 Pre-arcing I t values . 150

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7.9 Protection against electric shock . 150
8 Tests . 151
8.1.4 Arrangement of the fuse-link for tests . 151
8.1.5 Testing of fuse-links . 151
8.2.4 Acceptability of test results . 152
8.3 Verification of temperature rise and power dissipation . 153
8.3.1 Arrangement of the fuse . 153
8.3.4 Test method . 153
8.3.5 Acceptability of test results . 153
8.4 Verification of operation . 153
8.4.1 Arrangement of the fuse . 153
8.5 Breaking-capacity tests . 154
8.5.1 Arrangement of the fuse . 154
8.5.2 Characteristics of the test circuit . 154
8.5.4 Calibration of the test circuit . 154
8.5.5 Test method . 154
8.5.8 Acceptability of test results . 154
8.7 Verification of I t characteristics and overcurrent discrimination . 155
8.7.3 Verification of compliance for fuse-links at 0,01 s . 155
8.10 Verification of non-deterioration of contacts . 155
8.11.1 Mechanical strength . 155
Annex BB (informative) (for all fuse systems) – Alternative tests for tests No. 1 and
No. 2 of Table 20 of IEC 60269-1 . 161
Annex CC (informative) Recommendations for future designs of fuses (for all fuse
systems) . 163
Bibliography . 164

Figure 101 – Time-current zones for "gG" fuse-links . 37
Figure 102 – Time-current zones for "gG" fuse-links . 39
Figure 103 – Time-current zone for "gG" fuse-links 13 A and 32 A . 41
Figure 127 – Time-current zone for "gG" fuse-links 40 A . 42
Figure 104 – Dummy fuse-links according to 8.3 and 8.9.1.1 . 43
Figure 105 – Test rigs for fuse-links . 44
Figure 106 – Test rigs for fuse-links . 45
Figure 107 – Test arrangement for fuse-bases according to 8.9.1.2 . 46
Figure 108 – Example of a torque wrench according to 8.9.2 . 47
Figure 109 – Measuring points for the voltage drop (B, C) or the temperature rise (A,D)
according to 8.3.3, 8.3.4.1 and 8.10.2 of fuse system A . 48
Figure 110 – Fuse-link, D-type. Sizes D01-D03 . 50
Figure 111 – Fuse-link, D-type. Sizes DII-DIV . 51
Figure 111 – Fuse-link, D-type. Sizes
...