IEC 60269-1:2024

IEC 60269-1 ®
Edition 5.0 2024-08
REDLINE VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Low-voltage fuses –
Part 1: General requirements
Fusibles basse tension –
Partie 1: Exigences générales
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IEC 60269-1 ®
Edition 5.0 2024-08
REDLINE VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Low-voltage fuses –
Part 1: General requirements
Fusibles basse tension –
Partie 1: Exigences générales
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.120.50 ISBN 978-2-8322-9550-2
– 2 – IEC 60269-1:2024 RLV © IEC 2024
CONTENTS
FOREWORD . 7
INTRODUCTION .
1 General .
1 Scope and object . 11
2 Normative references . 11
3 Terms and definitions . 13
3.1 Fuses and their component parts . 13
3.2 General terms . 15
3.3 Characteristic quantities . 17
4 Conditions for operation in service . 21
4.1 General . 21
4.2 Ambient air temperature (T ) . 21
a
4.3 Altitude . 22
4.4 Atmospheric conditions . 22
4.5 Voltage . 22
4.6 Current . 22
4.7 Frequency, power factor and time constant . 22
4.7.1 Frequency . 22
4.7.2 Power factor . 22
4.7.3 Time constant (τ) . 22
4.8 Conditions of installation . 23
4.9 Utilization category class . 23
4.10 Discrimination Selectivity of fuse-links . 23
5 Classification . 23
6 Characteristics of fuses . 23
6.1 Summary of characteristics . 23
6.1.1 General . 23
6.1.2 Fuse-holders . 23
6.1.3 Fuse-links . 23
6.1.4 Complete fuses . 24
6.2 Rated voltage . 24
6.3 Rated current . 24
6.3.1 Rated current of the fuse-link . 25
6.3.2 Rated current of the fuse-holder . 25
6.4 Rated frequency (see 7.1 and 7.2) . 25
6.5 Rated power dissipation of a fuse-link and rated acceptable power
dissipation of a fuse-holder. . 26
6.6 Limits of time-current characteristics . 26
6.6.1 General . 26
6.6.2 Time-current characteristics, time-current zones . 26
6.6.3 Conventional times and currents . 26
6.6.4 Gates . 27
6.7 Breaking range and breaking capacity . 28
6.7.1 Breaking range and utilization category . 28
6.7.2 Rated breaking capacity . 29
6.8 Cut-off current and I t characteristics . 29

6.8.1 General . 29
6.8.2 Cut-off current characteristics . 29
6.8.3 I t characteristics . 29
7 Markings. 29
7.1 General . 29
7.2 Markings of fuse-holders . 29
7.3 Markings of fuse-links . 30
8 Standard conditions for construction . 30
8.1 Mechanical design . 30
8.1.1 Replacement of fuse-links . 30
8.1.2 Connections, including terminals . 31
8.1.3 Fuse-contacts . 31
8.1.4 Construction of a gauge-piece . 31
8.1.5 Mechanical strength of the fuse-link . 31
8.2 Insulating properties and suitability for isolation . 31
8.3 Temperature rise, power dissipation of the fuse-link and acceptable power
dissipation of a fuse-holder . 32
8.4 Operation . 33
8.5 Breaking capacity . 34
8.6 Cut-off current characteristic . 34
8.7 I t characteristics . 34
8.8 Overcurrent selectivity of fuse-links . 35
8.9 Protection against electric shock . 35
8.9.1 General . 35
8.9.2 Clearances and creepage distances . 36
8.9.3 Leakage currents of fuses suitable for isolation . 37
8.9.4 Additional constructional requirements for fuses fuse holders for linked
fuse-carriers, suitable for isolation . 37
8.10 Resistance to heat . 37
8.11 Mechanical
...