IEC 60269-2:2010

IEC 60269-2 ®
Edition 4.0 2010-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Low-voltage fuses –
Part 2: Supplementary requirements for fuses for use by authorized persons
(fuses mainly for industrial application) – Examples of standardized systems of
fuses A to J
Fusibles basse tension –
Partie 2: Exigences supplémentaires pour les fusibles destinés à être utilisés par
des personnes habilitées (fusibles pour usages essentiellement industriels) –
Exemples de systèmes de fusibles normalisés A à J

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IEC 60269-2 ®
Edition 4.0 2010-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Low-voltage fuses –
Part 2: Supplementary requirements for fuses for use by authorized persons
(fuses mainly for industrial application) – Examples of standardized systems of
fuses A to J
Fusibles basse tension –
Partie 2: Exigences supplémentaires pour les fusibles destinés à être utilisés
par des personnes habilitées (fusibles pour usages essentiellement industriels)
– Exemples de systèmes de fusibles normalisés A à J

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
XH
CODE PRIX
ICS 29.120.50 ISBN 978-2-88910-087-3
– 2 – 60269-2 © IEC:2010
CONTENTS
FOREWORD.14

INTRODUCTION.16

1 General scope .17

1.2 Normative references .18

Fuse system A – Fuses with fuse-links with blade contacts (NH fuse system) .19

1 General .19

1.1 Scope.19
2 Terms and definitions .19
3 Conditions for operation in service.19
4 Classification.20
5 Characteristics of fuses .20
5.2 Rated voltage.20
5.3.1 Rated current of the fuse-link.20
5.3.2 Rated current of the fuse-holder .20
5.5 Rated power dissipation of a fuse-link and rated acceptable power
dissipation of a fuse-holder .20
5.6 Limits of time-current characteristics .21
5.6.1 Time-current characteristics, time-current zones and overload curves .21
5.6.2 Conventional times and currents.21
5.6.3 Gates .21
5.7.2 Rated breaking capacity .21
6 Marking .22
6.1 Markings of fuse-holders .22
6.2 Markings of fuse-links.22
7 Standard conditions for construction.22
7.1 Mechanical design.23
7.1.2 Connections, including terminals .23
7.1.3 Fuse-contacts.23
7.1.6 Construction of fuse-bases .23
7.1.7 Construction of a fuse-link .24
7.2 Insulating properties.24

7.7 I t characteristics .24
7.8 Overcurrent discrimination of "gG" fuse-links.25
7.9 Protection against electric shock .25
8 Tests .25
8.1.4 Arrangement of the fuse and dimensions .26
8.1.6 Testing of fuse-holders .26
8.2.4 Acceptability of test results.27
8.2.5 Resistance to tracking .27
8.3 Verification of temperature rise and power dissipation.27
8.3.1 Arrangement of the fuse .27
8.3.2 Measurement of the temperature rise .28
8.5.8 Acceptability of test results.29
8.7.4 Verification of overcurrent discrimination .29

60269-2 © IEC:2010 – 3 –
8.9 Verification of resistance to heat .31

8.9.1 Fuse-base .31

8.9.2 Fuse-links with gripping lugs of moulded material or of metal fixed in

moulded material.31

8.10 Verification of non-deterioration of contacts and direct terminal clamps.32

8.10.1 Arrangement of the fuse .32

8.10.2 Test method .34

8.10.3 Acceptability of test results.35

8.11 Mechanical and miscellaneous tests.36

Annex AA (informative) Special test for cable overload protection.58

Fuse system B – Fuses with striker fuse-links with blade contacts (NH fuse
system) .59
1 General .59
1.1 Scope.59
2 Terms and definitions .59
3 Conditions for operation in service.59
4 Classification.59
5 Characteristics of fuses .59
5.2 Rated voltage.59
5.3.1 Rated current of the fuse-link.59
5.3.2 Rated current of the fuse-holder .60
5.5 Rated power dissipation of a fuse-link and rated acceptable power
dissipation of a fuse-holder .60
5.6 Limits of time-current characteristics .60
5.7.2 Rated breaking capacity .60
6 Marking .60
7 Standard conditions for construction.60
7.1 Mechanical design.60
7.1.2 Connections, including terminals .60
7.1.3 Fuse-contacts.60
7.1.7 Construction of a fuse-link .61
7.2 Insulating properties and suitability for insulation .61
7.7 I t chara
...