IEC 60127-7:2015

Miniature fuses - Part 7: Miniature fuse-links for special applications

IEC 60127-7:2015 covers requirements for miniature fuse-links for special applications. This part of IEC 60127 is applicable to fuse-links with a rated voltage not exceeding 1 000 V, a rated current not exceeding 20 A and a rated breaking capacity not exceeding 50 kA. It does not apply to fuses completely covered by the subsequent parts of IEC 60269-1. It does not apply to miniature fuse-links for appliances intended to be used under special conditions, such as in corrosive or explosive atmospheres. This part of IEC 60127 applies in addition to the requirements of IEC 60127-1. Miniature fuse-links for special applications are not intended to be replaced by the end-user of an electrical/electronic appliance. The object of this part of IEC 60127 is to establish uniform test methods for miniature fuse-links for special applications, so as to allow verification of the values (for example melting time and breaking capacity values) specified by the manufacturer. This second edition cancels and replaces the first edition published in 2013. This edition includes the following significant technical changes with respect to the previous edition:
- defining a test board for surface mount fuse-links, Figure 2;
- defining test schedules for homogenous series.
This publication is to be read in conjunction with IEC 60127-1:2006. Keywords: fuse-links with a rated voltage not exceeding 1 000 V, a rated current not exceeding 20 A and a rated breaking capacity not exceeding 50 kA.

Coupe-circuit miniatures - Partie 7: Eléments de remplacement miniatures pour applications spéciales

IEC 60127-7:2015 couvre des exigences pour des éléments de remplacement miniatures pour applications spéciales.
La présente partie de l'IEC 60127 est applicable aux éléments de remplacement de tension assignée ne dépassant pas 1 000 V, de courant assigné ne dépassant pas 20 A et de pouvoir de coupure assigné ne dépassant pas 50 kA.
Elle ne s'applique pas aux coupe-circuit complètement couverts par les autres parties de l'IEC 60269-1.
Elle n'est pas applicable aux éléments de remplacement miniatures placés dans des appareils destinés à être employés dans des conditions particulières, comme dans des atmosphères corrosives ou explosives.
La présente partie de l'IEC 60127 s'applique en complément des exigences de l'IEC 60127-1.
Les éléments de remplacement miniatures pour applications spéciales ne sont pas destinés à être remplacés par l'utilisateur final d'un appareil électronique ou électrique.
L’objet de la présente partie de l'IEC 60127 est d'établir des méthodes d'essai uniformes pour des éléments de remplacement miniatures pour applications spéciales, pour permettre de vérifier les valeurs (par exemple la durée de fusion et le pouvoir de coupure) spécifiées par le fabricant.
Cette deuxième édition annule et remplace la première édition, parue en 2013.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- définition d'une carte d'essai pour éléments de remplacement à montage en surface, Figure 2;
- définition des programmes d'essai pour les séries homogènes.
La présente Norme internationale doit être utilisée conjointement avec l'IEC 60127-1:2006
Mots clés: éléments de remplacement de tension assignée ne dépassant pas 1 000 V, courant assigné ne dépassant pas 20 A et de pouvoir de coupure assigné ne dépassant pas 50 kA.

General Information

• Status: Published
• Publication Date: 21-Sep-2015
• ICS: 29.120.50 - Fuses and other overcurrent protection devices
• Technical Committee: SC 32C - Miniature fuses
• Drafting Committee: WG 12 - TC 32/SC 32C/WG 12
• Current Stage: PPUB - Publication issued
• Start Date: 22-Sep-2015
• Completion Date: 31-Dec-2015

Relations

• Revises: IEC 60127-7:2013 - Miniature fuses - Part 7: Miniature fuse-links for special applications
• Effective Date: 05-Sep-2023

Overview - IEC 60127-7:2015 (Miniature fuse-links for special applications)

IEC 60127-7:2015 is Part 7 of the IEC 60127 series and specifies requirements and uniform test methods for miniature fuse-links for special applications. It applies to miniature fuse-links with a rated voltage not exceeding 1 000 V, a rated current not exceeding 20 A, and a rated breaking capacity not exceeding 50 kA. This second edition (2015) replaces the 2013 edition and is intended to be read in conjunction with IEC 60127-1:2006 (general definitions and requirements).

Key topics and technical requirements

• Scope and exclusions
  • Covers enclosed miniature fuse-links not covered by IEC 60127-2/3/4 and excludes devices intended for corrosive or explosive atmospheres or items already covered by IEC 60269-1 parts.
  • Fuse-links covered are typically not intended to be replaced by the end-user.
• Uniform test methods
  • Establishes standard procedures to verify manufacturer values such as melting time, breaking capacity, and endurance.
  • Includes breaking capacity tests (a.c. and d.c.), endurance tests, dissipation measurements and other electrical verifications.
• Test hardware and schedules
  • Introduces a test board for surface-mount fuse-links (Figure 2) and a standard test board for wire-terminated fuse-links (Figure 1).
  • Defines testing schedules for homogeneous series, enabling efficient qualification of series of related ampere ratings.
• Construction, marking and ratings
  • Specifies dimensional and construction considerations, marking requirements and which ratings must be agreed between manufacturer and test house (rated voltage, rated current, breaking capacity, time/current characteristic).
• Normative references
  • Intended to be used with IEC 60127-1 and references environmental, flammability and insulation coordination standards (e.g., IEC 60068, IEC 60695, IEC 60664).

Practical applications and who uses this standard

• Fuse manufacturers - design and qualify miniature fuse-links for special applications and to establish consistent datasheet values.
• Test laboratories and certification bodies - perform standardized tests and verify manufacturer claims for melting times and breaking capacity.
• Product designers and OEMs - select appropriate miniature fuse-links for electronic appliances, power supplies and PCB-mounted protection where end-user replacement is not intended.
• Safety and compliance engineers - ensure products meet international safety testing, marking and performance requirements.

Related standards

• IEC 60127-1 (definitions and general requirements) - essential companion document
• IEC 60127-4, -6 (related fuse types and holders) and applicable environmental and flammability standards (IEC 60068, IEC 60695, IEC 60664)

Keywords: IEC 60127-7:2015, miniature fuse-links, rated voltage not exceeding 1 000 V, rated current not exceeding 20 A, rated breaking capacity not exceeding 50 kA, surface-mount test board, homogeneous series, breaking capacity tests.

Standards Content (Sample)

IEC 60127-7 ®
Edition 2.0 2015-09
INTERNATIONAL
STANDARD
Miniature fuses –
Part 7: Miniature fuse-links for special applications
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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IEC 60127-7 ®
Edition 2.0 2015-09
INTERNATIONAL
STANDARD
Miniature fuses –
Part 7: Miniature fuse-links for special applications

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.120.50 ISBN 978-2-8322-2913-2

– 2 – IEC 60127-7:2015 © IEC 2015
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 General requirements . 8
5 Standard ratings . 8
6 Marking . 8
7 General notes on tests . 9
8 Dimensions and construction . 14
9 Electrical requirements . 15
10 Standard sheets . 25
Annex A (informative) Guidance on ratings to be specified by the manufacturer or to
be agreed upon with the testing house . 28
Bibliography . 29

Figure 1 – Standard test board for fuse-links with wire terminations . 11
Figure 2 – Test board for surface mount fuse-links . 12
Figure 3 – Test fuse base . 13
Figure 4 – Test circuits for breaking capacity tests . 16

Table 1 – Power factor and time constant . 17
Table 2 – Testing schedule for individual ampere ratings for a.c. or d.c. breaking
capacity fuse-links . 20
Table 3 – Testing schedule for individual ampere ratings for a.c. and d.c. breaking
capacity fuse-links . 21
Table 4 – Testing schedule for maximum ampere rating of a homogeneous series (a.c.
or d.c. breaking capacity fuse-links) . 22
Table 5 – Testing schedule for maximum ampere rating of a homogeneous series (a.c.
and d.c. breaking capacity fuse-links) . 23
Table 6 – Testing schedule for minimum ampere rating of a homogeneous series. 24
Table 7 – Testing schedule for all intermediate ampere ratings of a homogeneous

series. 24
Table A.1 – Guidance on ratings to be specified by the manufacturer or to be agreed
upon with the testing house . 28

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MINIATURE FUSES –
Part 7: Miniature fuse-links for special applications

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
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4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60127-7 has been prepared by subcommittee 32C: Miniature fuses,
of IEC technical committee 32: Fuses.
This second edition cancels and replaces the first edition published in 2013.
This edition includes the following significant technical changes with respect to the previous
edition:
a) defining a test board for surface mount fuse-links, Figure 2;
b) defining test schedules for homogenous series.

– 4 – IEC 60127-7:2015 © IEC 2015
The text of this standard is based on the following documents:
CDV Report on voting
32C/507/CDV 32C/513/RVC
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 60127 series, published under the general title Miniature fuses,
can be found on the IEC website.
This International Standard is to be used in conjunction with IEC 60127-1:2006, Miniature
fuses – Part 1: Definitions for miniature fuses and general requirements for miniature fuse-
links and its Amendment 1 (2011).
The clauses of this standard supplement, modify or replace the corresponding clauses in
IEC 60127-1.
Where there is no corresponding clause or subclause in this standard, the clause or
subclause of IEC 60127-1 applies without modification as far as is reasonable. When this
standard states “addition” or “replacement”, the relevant text in IEC 60127-1 is to be adapted
accordingly.
Subclauses which are additional to those in Part 1 are numbered starting from 101. Additional
annexes are numbered AA, BB, etc.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC website under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.

INTRODUCTION
According to the wish expressed by the users of miniature fuses, all standards,
recommendations and other documents relating to miniature fuses should have the same
publication number in order to facilitate reference to fuses in other specifications, for example,
equipment specifications.
Furthermore, a single publication number and subdivision into parts would facilitate the
establishment of new standards, because clauses containing general requirements need not
be repeated.
The IEC 60127 series, under the general heading Miniature fuses, is thus subdivided as
follows:
IEC 60127-1, Miniature fuses – Part 1: Definitions for miniature fuses and general
requirements for miniature fuse-links
IEC 60127-2, Miniature fuses – Part 2: Cartridge fuse-links
IEC 60127-3, Miniature fuses – Part 3: Sub-miniature fuse-links
IEC 60127-4, Miniature fuses – Part 4: Universal modular fuse-links (UMF) – Through-hole
and surface mount types
IEC 60127-5, Miniature fuses – Part 5: Guidelines for quality assessment of miniature fuse-
links
IEC 60127-6, Miniature fuses – Part 6: Fuse-holders for miniature fuse-links
IEC 60127-7, Miniature fuses – Part 7: Miniature fuse-links for special applications
IEC 60127-8, (Free for further documents)
IEC 60127-9, (Free for further documents)
IEC 60127-10, Miniature fuses – Part 10: User guide for miniature fuses

– 6 – IEC 60127-7:2015 © IEC 2015
MINIATURE FUSES –
Part 7: Miniature fuse-links for special applications

1 Scope
This part of IEC 60127 covers requirements for miniature fuse-links for special applications.
This part of IEC 60127 is applicable to fuse-links with a rated voltage not exceeding 1 000 V,
a rated current not exceeding 20 A and a rated breaking capacity not exceeding 50 kA.
It does not apply to fuses completely covered by the subsequent parts of IEC 60269-1.
It does not apply to miniature fuse-links for appliances intended to be used under special
conditions, such as in corrosive or explosive atmospheres.
This part of IEC 60127 applies in addition to the requirements of IEC 60127-1.
Miniature fuse-links for special applications are not intended to be replaced by the end-user of
an electrical / electronic appliance.
The object of this part of IEC 60127 is to establish uniform test methods for miniature fuse-
links for special applications, so as to allow verification of the values (for example melting
time and breaking capacity values) specified by the manufacturer.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60068-2-21:2006, Environmental testing – Part 2-21: Tests – Test U: Robustness of
terminations and integral mounting devices
IEC 60127-1:2006, Miniature fuses – Part 1: Definitions for miniature fuses and general
requirements for miniature fuse-links
IEC 60127-1:2006/AMD1:2011
IEC 60127-1:2006/AMD2:2015
IEC 60127-4:2005, Miniature fuses – Part 4: Universal modular fuse-links (UMF) – Through-
hole and surface mount types
IEC 60127-4:2005/AMD1:2008
IEC 60127-4:2005/AMD2:2012
IEC 60127-6:2014, Miniature fuses – Part 6: Fuse-holders for miniature fuse-links
IEC 60664-1:2007, Insulation coordination for equipment within low-voltage systems – Part 1:
Principles, requirements and tests

IEC 60695-2-12:2010, Fire hazard testing – Part 2-12: Glowing/hot-wire based test methods –
Glow-wire flammability index (GWFI) test method for materials
IEC 60695-2-12:2010/AMD1:2014
IEC 60695-2-13:2010, Fire hazard testing – Part 2-13: Glowing/hot-wire based test methods –
Glow-wire ignition temperature (GWIT) test method for materials
IEC 60695-2-13:2010/AMD1:2014
IEC 60695-4:2012, Fire hazard testing – Part 4: Terminology concerning fire tests for
electrotechnical products
IEC 61249-2-7:2002, Materials for printed boards and other interconnecting structures – Part
2-7: Reinforced base materials clad and unclad – Epoxide woven E-glass laminated sheet of
defined flammability (vertical burning test), copper-clad
ISO 3:1973, Preferred numbers – Series of preferred numbers
3 Terms and definitions
For the purposes of this document, the terms and definitions given in Clause 3 of IEC 60127-
1:2006, except 3.5, as well as the following apply.
3.1
miniature fuse-link for special applications
enclosed fuse-link which is not covered in IEC 60127-2, IEC 60127-3 or IEC 60127-4 and of
rated breaking capacity not exceeding 50 kA, with a width and height not exceeding 12 mm
and a length not exceeding 50 mm
Note 1 to entry: Special precautions may be necessary to ensure that the fuse-links will be replaced by a fuse-link
with the same technical parameters.
Note 2 to entry: For fuse-links having a metallic cap at each end, any member of terminals or terminations other
than the metallic cap such as wire terminations, pins and bolt-in contacts may not be included in the total length of
50 mm and the width and height of 12 mm.
3.2
t to t
1 8
limit values for time/current characteristic
3.3
I
test current for testing at elevated temperature of 70 °C
Note 1 to entry: Preferred values are 0,8 I or 1,0 I or 1,1 I .
N N N
3.4
I (A)
test
test current for endurance testing according to method A
Note 1 to entry: Preferred values are 1,0 I or 1,05 I or 1,2 I .
N N N
3.5
I (B)
test
test current for endurance testing according to method B
Note 1 to entry: Preferred values are 0,8 I or 1,0 I .
N N
3.6
I (A)
OVL
test current for measuring the maximum sustained dissipation according to method A

– 8 – IEC 60127-7:2015 © IEC 2015
Note 1 to entry: Preferred values are 1,25 I or 1,35 I or 1,5 I .
N N N
3.7
I (B)
OVL
test current for measuring the maximum sustained dissipation according to method B
Note 1 to entry: Preferred values are 1,0 I or 1,25 I .
N N
4 General requirements
Clause 4 of IEC 60127-1:2006 applies.
5 Standard ratings
Clause 5 of IEC 60127-1:2006 does not apply.
Replacement:
The following ratings shall be agreed upon between the testing house and the manufacturer:
– rated voltage;
– rated current (see standard sheet 1 for preferred ratings);
– rated breaking capacity (a.c. and/or d.c.);
– time/current characteristic (at least at 2,0 I or 2,1 I and 10 I ).
N N N
The following may be agreed upon on an optional basis:
– test at elevated temperature;
– time/current characteristic (additionally at 2,75 I and 4 I ).
N N
Any additional specified values are given in standard sheet 1.
6 Marking
Clause 6 of IEC 60127-1:2006 applies except as follows.
6.1
Replacement:
d) Not applicable.
NOTE A symbol denoting the time/current characteristic cannot be stated, because this part of IEC 60127 does
not specify any values for this parameter.
Addition:
e) Type designation.
f) Rated breaking capacity in amperes (A) or in kilo amperes (kA).
6.2
Deletion of NOTE 2.
6.3
Addition after first paragraph:

Furthermore the rated breaking capacity in amperes (A) or in kilo amperes (kA) shall be
marked on the package label.
6.4
Addition of heading title and replacement of text:
6.4 Colour coding for miniature fuse-links for special applications
Marking of fuse-links by means of colour bands according to IEC 60127-1:2006, Annex A, is
not permitted. It is, however, possible to use colour markings that clearly differ from this
colour band system. In this case, the manufacturer shall provide the relevant information, for
example colour key.
Additional subclause:
6.101 Where marking is impracticable due to space limitations, the relevant information
should appear on the smallest package and in the manufacturer’s technical literature.
7 General notes on tests
Clause 7 of IEC 60127-1:2006 applies except as follows.
7.2 Type tests
7.2.1
Replacement:
For testing the individual current ratings of fuses with a.c. or d.c. breaking capacity, the
number of fuse-links required is 51, of which 12 are kept as spares. For fuse-links with wire
terminations six extra samples (E1 to E6) have to be taken by random and not sorted
according to voltage drop. If necessary, these samples can be used as additional spares after
performing the tests according to 8.3.
The testing schedule is shown in Table 2.
For testing the individual current ratings of fuses with a.c. and d.c. breaking capacity, the
number of fuse-links required is 63, of which 9 are kept as spares. For fuse-links with wire
terminations six extra samples (E1 to E6) have to be taken by random and not sorted
according to voltage drop. If necessary, these samples can be used as additional spares after
performing the tests according to 8.3.The testing schedule is shown in Table 3.
For testing the maximum ampere rating of a homogenous series with a.c. or d.c. breaking
capacity the number of fuse-links required is 51, of which 22 are kept as spares. For fuse-
links with wire terminations six extra samples (E1 to E6) have to be taken by random and not
sorted according to voltage drop. If necessary, these samples can be used as additional
spares after performing the tests according to 8.3.
The testing schedule is shown in Table 4.
For testing the maximum ampere rating of a homogenous series with a.c. and d.c. breaking
capacity the number of fuse-links required is 66, of which 32 are kept as spares. For fuse-
links with wire terminations six extra samples (E1 to E6) have to be taken by random and not
sorted according to voltage drop. If necessary, these samples can be used as additional
spares after performing the tests according to 8.3.

– 10 – IEC 60127-7:2015 © IEC 2015
The testing schedule is shown in Table 5.
For testing the minimum ampere rating of a homogenous series with a.c. and / or d.c.
breaking capacity the number of fuse-links required is 38, of which 16 are kept as spares.
The testing schedule is shown in Table 6.
For testing all of the intermediate ampere rating of a homogenous series with a.c. and / or d.c.
breaking capacity the number of fuse-links required is 38, of which 16 are kept as spares.
The testing schedule is shown in Table 7.
7.3 Fuse-bases for tests
Addition after first paragraph:
For fuse-links designed for use in a special type of fuse-holder, testing shall be performed in
that fuse-holder.
For tests that require a printed circuit board for mounting and connection of the fuse-links, a
test board according to Figure 1 or Figure 2 shall be used.
The test board according to Figure 1 shall be used for fuse links with wire terminations
intended for insertion in suitably designed holes or sockets.
The test board according to Figure 2 shall be used for surface mount fuse-links.
When two or more fuse-links are tested in series, the fuse-bases shall be located so that
there will be a spacing of not less than 50 mm between any two fuse-links under testing. The
conductor connecting the fuse-bases together, and connecting the fuse-bases to the ammeter
and the source of supply shall be insulated copper wire. The length of each conductor shall be
500 mm and the cross-sectional area of the wire shall be approximately 1 mm for fuse-links
with rated currents up to and including 6,3 A, and 6 mm for rated currents exceeding 6,3 A.

Dimensions in millimetres
∅4,2
O
U
U
n × e
Figure 1A
∅ D
n × e
Radius =
IEC
Key
O copper layer; thickness 0,035 mm or 0,070 mm
U connection for voltage drop measurement
D diameter of 1 mm for rated currents up to and including 6,3 A;
diameter of 1,5 mm for rated currents exceeding 6,3 A.
e 2,5 mm
n 1, 2, 3, 4
n 1, 2, 3 … (to be adapted depending on the length of the fuse-link)
Figure 1 – Standard test board for fuse-links with wire terminations
This test board shall be mounted on the fuse-base according to Figure 3a.
n × e
16,5 3
– 12 – IEC 60127-7:2015 © IEC 2015
Dimensions in millimetres
P 2T
Track width (20)
U O U
Solder resist
IEC
Key
O copper layer, thickness 0,035 mm or 0,070 mm
U connection for voltage drop measurement
W tracking width equals n x e referring to Figure 1. For small devices, it may be necessary to use reduced track
widths, representing normal use of these devices. This should be recorded in the test report and in the
manufacturer's literature.
P terminal spacing
R refer to standard sheet 1, page 1
T refer to standard sheet 1, page 1
NOTE 1 Solder resist to be applied in hatched areas.
Figure 2 – Test board for
...

IEC 60127-7 ®
Edition 2.0 2015-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Miniature fuses –
Part 7: Miniature fuse-links for special applications

Coupe-circuit miniatures –
Partie 7: Éléments de remplacement miniatures pour applications spéciales
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
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IEC 60127-7 ®
Edition 2.0 2015-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Miniature fuses –
Part 7: Miniature fuse-links for special applications

Coupe-circuit miniatures –
Partie 7: Éléments de remplacement miniatures pour applications spéciales

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.120.50 ISBN 978-2-8322-5506-3

– 2 – IEC 60127-7:2015 © IEC 2015
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 General requirements . 8
5 Standard ratings . 8
6 Marking . 8
7 General notes on tests . 9
8 Dimensions and construction . 14
9 Electrical requirements . 15
10 Standard sheets . 25
Annex A (informative) Guidance on ratings to be specified by the manufacturer or to
be agreed upon with the testing house . 28
Bibliography . 29

Figure 1 – Standard test board for fuse-links with wire terminations . 11
Figure 2 – Test board for surface mount fuse-links . 12
Figure 3 – Test fuse base . 13
Figure 4 – Test circuits for breaking capacity tests . 16

Table 1 – Power factor and time constant . 17
Table 2 – Testing schedule for individual ampere ratings for a.c. or d.c. breaking
capacity fuse-links . 20
Table 3 – Testing schedule for individual ampere ratings for a.c. and d.c. breaking
capacity fuse-links . 21
Table 4 – Testing schedule for maximum ampere rating of a homogeneous series (a.c.
or d.c. breaking capacity fuse-links) . 22
Table 5 – Testing schedule for maximum ampere rating of a homogeneous series (a.c.
and d.c. breaking capacity fuse-links) . 23
Table 6 – Testing schedule for minimum ampere rating of a homogeneous series. 24
Table 7 – Testing schedule for all intermediate ampere ratings of a homogeneous

series. 24
Table A.1 – Guidance on ratings to be specified by the manufacturer or to be agreed
upon with the testing house . 28

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MINIATURE FUSES –
Part 7: Miniature fuse-links for special applications

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60127-7 has been prepared by subcommittee 32C: Miniature fuses,
of IEC technical committee 32: Fuses.
This bilingual version (2018-03) corresponds to the monolingual English version, published in
2015-09.
This second edition cancels and replaces the first edition published in 2013.
This edition includes the following significant technical changes with respect to the previous
edition:
a) defining a test board for surface mount fuse-links, Figure 2;
b) defining test schedules for homogenous series.

– 4 – IEC 60127-7:2015 © IEC 2015
The text of this standard is based on the following documents:
CDV Report on voting
32C/507/CDV 32C/513/RVC
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
The French version of this standard has not been voted upon.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 60127 series, published under the general title Miniature fuses,
can be found on the IEC website.
This International Standard is to be used in conjunction with IEC 60127-1:2006, Miniature
fuses – Part 1: Definitions for miniature fuses and general requirements for miniature fuse-
links and its Amendment 1 (2011).
The clauses of this standard supplement, modify or replace the corresponding clauses in
IEC 60127-1.
Where there is no corresponding clause or subclause in this standard, the clause or
subclause of IEC 60127-1 applies without modification as far as is reasonable. When this
standard states “addition” or “replacement”, the relevant text in IEC 60127-1 is to be adapted
accordingly.
Subclauses which are additional to those in Part 1 are numbered starting from 101. Additional
annexes are numbered AA, BB, etc.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC website under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
INTRODUCTION
According to the wish expressed by the users of miniature fuses, all standards,
recommendations and other documents relating to miniature fuses should have the same
publication number in order to facilitate reference to fuses in other specifications, for example,
equipment specifications.
Furthermore, a single publication number and subdivision into parts would facilitate the
establishment of new standards, because clauses containing general requirements need not
be repeated.
The IEC 60127 series, under the general heading Miniature fuses, is thus subdivided as
follows:
IEC 60127-1, Miniature fuses – Part 1: Definitions for miniature fuses and general
requirements for miniature fuse-links
IEC 60127-2, Miniature fuses – Part 2: Cartridge fuse-links
IEC 60127-3, Miniature fuses – Part 3: Sub-miniature fuse-links
IEC 60127-4, Miniature fuses – Part 4: Universal modular fuse-links (UMF) – Through-hole
and surface mount types
IEC 60127-5, Miniature fuses – Part 5: Guidelines for quality assessment of miniature fuse-
links
IEC 60127-6, Miniature fuses – Part 6: Fuse-holders for miniature fuse-links
IEC 60127-7, Miniature fuses – Part 7: Miniature fuse-links for special applications
IEC 60127-8, (Free for further documents)
IEC 60127-9, (Free for further documents)
IEC 60127-10, Miniature fuses – Part 10: User guide for miniature fuses

– 6 – IEC 60127-7:2015 © IEC 2015
MINIATURE FUSES –
Part 7: Miniature fuse-links for special applications

1 Scope
This part of IEC 60127 covers requirements for miniature fuse-links for special applications.
This part of IEC 60127 is applicable to fuse-links with a rated voltage not exceeding 1 000 V,
a rated current not exceeding 20 A and a rated breaking capacity not exceeding 50 kA.
It does not apply to fuses completely covered by the subsequent parts of IEC 60269-1.
It does not apply to miniature fuse-links for appliances intended to be used under special
conditions, such as in corrosive or explosive atmospheres.
This part of IEC 60127 applies in addition to the requirements of IEC 60127-1.
Miniature fuse-links for special applications are not intended to be replaced by the end-user of
an electrical / electronic appliance.
The object of this part of IEC 60127 is to establish uniform test methods for miniature fuse-
links for special applications, so as to allow verification of the values (for example melting
time and breaking capacity values) specified by the manufacturer.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60068-2-21:2006, Environmental testing – Part 2-21: Tests – Test U: Robustness of
terminations and integral mounting devices
IEC 60127-1:2006, Miniature fuses – Part 1: Definitions for miniature fuses and general
requirements for miniature fuse-links
IEC 60127-1:2006/AMD1:2011
IEC 60127-1:2006/AMD2:2015
IEC 60127-4:2005, Miniature fuses – Part 4: Universal modular fuse-links (UMF) – Through-
hole and surface mount types
IEC 60127-4:2005/AMD1:2008
IEC 60127-4:2005/AMD2:2012
IEC 60127-6:2014, Miniature fuses – Part 6: Fuse-holders for miniature fuse-links
IEC 60664-1:2007, Insulation coordination for equipment within low-voltage systems – Part 1:
Principles, requirements and tests

IEC 60695-2-12:2010, Fire hazard testing – Part 2-12: Glowing/hot-wire based test methods –
Glow-wire flammability index (GWFI) test method for materials
IEC 60695-2-12:2010/AMD1:2014
IEC 60695-2-13:2010, Fire hazard testing – Part 2-13: Glowing/hot-wire based test methods –
Glow-wire ignition temperature (GWIT) test method for materials
IEC 60695-2-13:2010/AMD1:2014
IEC 60695-4:2012, Fire hazard testing – Part 4: Terminology concerning fire tests for
electrotechnical products
IEC 61249-2-7:2002, Materials for printed boards and other interconnecting structures – Part
2-7: Reinforced base materials clad and unclad – Epoxide woven E-glass laminated sheet of
defined flammability (vertical burning test), copper-clad
ISO 3:1973, Preferred numbers – Series of preferred numbers
3 Terms and definitions
For the purposes of this document, the terms and definitions given in Clause 3 of IEC 60127-
1:2006, except 3.5, as well as the following apply.
3.1
miniature fuse-link for special applications
enclosed fuse-link which is not covered in IEC 60127-2, IEC 60127-3 or IEC 60127-4 and of
rated breaking capacity not exceeding 50 kA, with a width and height not exceeding 12 mm
and a length not exceeding 50 mm
Note 1 to entry: Special precautions may be necessary to ensure that the fuse-links will be replaced by a fuse-link
with the same technical parameters.
Note 2 to entry: For fuse-links having a metallic cap at each end, any member of terminals or terminations other
than the metallic cap such as wire terminations, pins and bolt-in contacts may not be included in the total length of
50 mm and the width and height of 12 mm.
3.2
t to t
1 8
limit values for time/current characteristic
3.3
I
test current for testing at elevated temperature of 70 °C
Note 1 to entry: Preferred values are 0,8 I or 1,0 I or 1,1 I .
N N N
3.4
I (A)
test
test current for endurance testing according to method A
Note 1 to entry: Preferred values are 1,0 I or 1,05 I or 1,2 I .
N N N
3.5
I (B)
test
test current for endurance testing according to method B
Note 1 to entry: Preferred values are 0,8 I or 1,0 I .
N N
– 8 – IEC 60127-7:2015 © IEC 2015
3.6
I (A)
OVL
test current for measuring the maximum sustained dissipation according to method A
Note 1 to entry: Preferred values are 1,25 I or 1,35 I or 1,5 I .
N N N
3.7
I (B)
OVL
test current for measuring the maximum sustained dissipation according to method B
Note 1 to entry: Preferred values are 1,0 I or 1,25 I .
N N
4 General requirements
Clause 4 of IEC 60127-1:2006 applies.
5 Standard ratings
Clause 5 of IEC 60127-1:2006 does not apply.
Replacement:
The following ratings shall be agreed upon between the testing house and the manufacturer:
– rated voltage;
– rated current (see standard sheet 1 for preferred ratings);
– rated breaking capacity (a.c. and/or d.c.);
– time/current characteristic (at least at 2,0 I or 2,1 I and 10 I ).
N N N
The following may be agreed upon on an optional basis:
– test at elevated temperature;
– time/current characteristic (additionally at 2,75 I and 4 I ).
N N
Any additional specified values are given in standard sheet 1.
6 Marking
Clause 6 of IEC 60127-1:2006 applies except as follows.
6.1
Replacement:
d) Not applicable.
NOTE A symbol denoting the time/current characteristic cannot be stated, because this part of IEC 60127 does
not specify any values for this parameter.
Addition:
e) Type designation.
f) Rated breaking capacity in amperes (A) or in kilo amperes (kA).
6.2
Deletion of NOTE 2.
6.3
Addition after first paragraph:
Furthermore the rated breaking capacity in amperes (A) or in kilo amperes (kA) shall be
marked on the package label.
6.4
Addition of heading title and replacement of text:
6.4 Colour coding for miniature fuse-links for special applications
Marking of fuse-links by means of colour bands according to IEC 60127-1:2006, Annex A, is
not permitted. It is, however, possible to use colour markings that clearly differ from this
colour band system. In this case, the manufacturer shall provide the relevant information, for
example colour key.
Additional subclause:
6.101 Where marking is impracticable due to space limitations, the relevant information
should appear on the smallest package and in the manufacturer’s technical literature.
7 General notes on tests
Clause 7 of IEC 60127-1:2006 applies except as follows.
7.2 Type tests
7.2.1
Replacement:
For testing the individual current ratings of fuses with a.c. or d.c. breaking capacity, the
number of fuse-links required is 51, of which 12 are kept as spares. For fuse-links with wire
terminations six extra samples (E1 to E6) have to be taken by random and not sorted
according to voltage drop. If necessary, these samples can be used as additional spares after
performing the tests according to 8.3.
The testing schedule is shown in Table 2.
For testing the individual current ratings of fuses with a.c. and d.c. breaking capacity, the
number of fuse-links required is 63, of which 9 are kept as spares. For fuse-links with wire
terminations six extra samples (E1 to E6) have to be taken by random and not sorted
according to voltage drop. If necessary, these samples can be used as additional spares after
performing the tests according to 8.3.The testing schedule is shown in Table 3.
For testing the maximum ampere rating of a homogenous series with a.c. or d.c. breaking
capacity the number of fuse-links required is 51, of which 22 are kept as spares. For fuse-
links with wire terminations six extra samples (E1 to E6) have to be taken by random and not
sorted according to voltage drop. If necessary, these samples can be used as additional
spares after performing the tests according to 8.3.
The testing schedule is shown in Table 4.

– 10 – IEC 60127-7:2015 © IEC 2015
For testing the maximum ampere rating of a homogenous series with a.c. and d.c. breaking
capacity the number of fuse-links required is 66, of which 32 are kept as spares. For fuse-
links with wire terminations six extra samples (E1 to E6) have to be taken by random and not
sorted according to voltage drop. If necessary, these samples can be used as additional
spares after performing the tests according to 8.3.
The testing schedule is shown in Table 5.
For testing the minimum ampere rating of a homogenous series with a.c. and / or d.c.
breaking capacity the number of fuse-links required is 38, of which 16 are kept as spares.
The testing schedule is shown in Table 6.
For testing all of the intermediate ampere rating of a homogenous series with a.c. and / or d.c.
breaking capacity the number of fuse-links required is 38, of which 16 are kept as spares.
The testing schedule is shown in Table 7.
7.3 Fuse-bases for tests
Addition after first paragraph:
For fuse-links designed for use in a special type of fuse-holder, testing shall be performed in
that fuse-holder.
For tests that require a printed circuit board for mounting and connection of the fuse-links, a
test board according to Figure 1 or Figure 2 shall be used.
The test board according to Figure 1 shall be used for fuse links with wire terminations
intended for insertion in suitably designed holes or sockets.
The test board according to Figure 2 shall be used for surface mount fuse-links.
When two or more fuse-links are tested in series, the fuse-bases shall be located so that
there will be a spacing of not less than 50 mm between any two fuse-links under testing. The
conductor connecting the fuse-bases together, and connecting the fuse-bases to the ammeter
and the source of supply shall be insulated copper wire. The length of each conductor shall be
500 mm and the cross-sectional area of the wire shall be approximately 1 mm for fuse-links
with rated currents up to and including 6,3 A, and 6 mm for rated currents exceeding 6,3 A.

Dimensions in millimetres
∅4,2
O
U
U
n × e
Figure 1A
∅ D
n × e
Radius =
IEC
Key
O copper layer; thickness 0,035 mm or 0,070 mm
U connection for voltage drop measurement
D diameter of 1 mm for rated currents up to and including 6,3 A;
diameter of 1,5 mm for rated currents exceeding 6,3 A.
e 2,5 mm
n 1, 2, 3, 4
n 1, 2, 3 … (to be adapted depending on the length of the fuse-link)
Figure 1 – Standard test board for fuse-links with wire terminations
This test board shall be mounted on the fuse-base according to Figure 3a.
n × e
16,5 3
– 12 – IEC 60127-7:2015 © IEC 2015
Dimensions in millimetres
P 2T
Track width (20)
U O U
Solder resist
IEC
Key
O copper layer, thickness 0,035 mm or 0,070 mm
U connection for voltage drop measurement
W tracking width equals n x e referring to Figure 1. For small devices, it may be necessary to use reduced track
widths, representing normal use of these devices. This should be recorded in the test report and in the
manufacturer's literature.
P terminal spacing
R refer to standard sheet 1, page 1
T refer to standard sheet 1, page 1
NOTE 1 Solder resist to be applied in hatched areas.
Figure 2 – Test board for surface mount fuse-links
This test board shall be mounted on the fuse-base according to Figure 3b.
The land areas should be suitably prepared for soldering.
A mechanical device may be used as long as it is demonstrated that the results are the same
(not applicable to 9.7).
10,0
∅4,2
R1,5
W 0,5
16,5
Dimensions in millimetres
C
F
D
D
G
E
E B
A
IEC
Figure 3a – Fuse-links with wire terminations (printed circuit track underneath)
C
K
K
J
J
F
E
E
B
A
IEC
Figure 3b – Surface mount fuse-link (printed circuit track on top)
Dimensions in millimetres
H
IEC
A base of low heat conducting material, thickness F printed circuit board (see Figure 1 and Figure 2)
10 mm
B brass electrodes 10 mm × 10 mm G space between fuse body and board equals
(0,5 ± 0,25) mm
C Fuse-link soldered in place H top view of base with brass electrodes
D fixing screws J silver-plated brass washer (two places)
E contact screws holding solder terminal K silver-plated brass screw to make contact with the
conducting surface on top of the printed circuit
board(two places)
Figure 3 – Test fuse base
The test board shall be made of epoxide woven glass fabric copper-clad laminated sheet, as
defined in IEC 61249-2-7.
The nominal sheet thickness shall be 1,6 mm.
– 14 – IEC 60127-7:2015 © IEC 2015
The nominal thickness of copper layer may be 0,035 mm or 0,070 mm.
The nominal width of copper layer may be 2,5 mm, 5 mm, 7,5 mm or 10 mm.
The nominal thickness and nominal width of applied copper layer shall be stated in the test
report.
Metal parts of the fuse-base shall be made of brass with a copper content between 58 % and
70 %. Contact parts shall be silver-plated.
7.4 Nature of supply
Addition, after second paragraph:
Schedule for testing fuse-links with a.c. or d.c. breaking capacity according to Standard
Sheet 1, see Table 2.
Schedule for testing fuse-links with a.c. and d.c. breaking capacity according to Standard
Sheet 1, see Table 3.
8 Dimensions and construction
Clause 8 of IEC 60127-1:2006 applies except as follows.
8.2 Construction
Replacement:
The fuse-element shall be completely enclosed.
The fuse-links shall be resistant to heat according to 9.7, and to fire according to
IEC 60695-2-12 and IEC 60695-2-13.
This is not applicable for fuse-links which represent small parts according to
IEC 60695-4:2012, 3.78.
For fuse bodies made of plastic material or of material containing organic substances the
following minimum requirements apply:
– Glow-wire ignition temperature (GWIT) = 775 °C
– Glow-wire flammability index (GWFI) = 850 °C
NOTE 1 Dimensions for the material plates for the glow wire tests are given in IEC 60695-2-12:2010, 4.2 or in
IEC 60695-2-13:2010, 4.2.
NOTE 2 For materials such as glass and ceramic whose GWIT and GWFI are thought to be higher than 775 °C
and respectively 850 °C the glow-wire tests do not apply.
8.3 Fuse-link terminations
Replacement:
Subclause 8.3 applies only to fuse-links with wire terminations.
Fuse-link contacts shall be made of non-corroding material or of material suitably protected
against corrosion, and shall be effectively free from flux or other non-conducting substance on
their outer surfaces.
Nickel or silver plating is deemed to be adequate protection for brass end caps.
The fuse-link terminations shall be reliably attached.
The samples shall be immersed in water for 24 h at a temperature of between 15 °C and
35 °C.
Terminations shall withstand the mechanical forces likely to be encountered during normal
use. With the fuse-link held in a fixed position, each terminal in turn is subjected at ambient
temperature to the forces laid down in this standard. The test samples shall be equally divided
among the specific termination tests.
Present test methods shall be performed in accordance with IEC 60068-2-21.
– For the tensile test (Ua ), the force applied shall be 10 N.
– For the thrust test (Ua ), the force applied shall be 2 N.
– For the bending test (Ub), if applicable, the force applied shall be 5 N and the number of
bends shall be one.
After the conclusion of testing, the fuse-link terminations shall remain firmly attached and the
voltage drop shall not exceed the maximum allowed value in standard sheet 1.
9 Electrical requirements
Clause 9 of IEC 60127-1:2006 applies except as follows.
9.1 Voltage drop
Addition, after Note 2:
The use of a high impedance voltmeter is recommended for measuring the voltage drop. The
voltage drop shall be measured directly at the fuse-link terminations or, where this is not
possible, in the immediate vicinity of the fuse body.
If the test board according to Figure 1 or Figure 2 is used, the voltage drop may be measured
at the points marked with U.
9.2 Time/current characteristic
9.2.1 Time/current characteristic at normal ambient temperature
th
Addition, after 4 paragraph:
Limit values t to t given in standard sheet 1 shall be defined by the manufacturer.
1 8
Limit values t (maximum value at 2,1 I or 2,0 I ) and t (maximum value at 10 I ) are
2 N N 8 N
required to be specified. Limit values t , t , t , t , t and t are optional.
1 3 4 5 6 7
The value t shall be not more than 1 h.
The value t shall be not more than 1 s.
9.2.2 Test at elevated temperature
Replacement:
– 16 – IEC 60127-7:2015 © IEC 2015
If declared by the manufacturer, this test shall be carried out according to IEC 60127-1:2006,
9.2.2, using the test current (I ) specified by the manufacturer.
9.3 Breaking capacity
9.3.1 Operating conditions
Addition:
In the case of fuse-links in which any component is organic (such as with a moulded body),
the recovery voltage shall be maintained for 5 min after the fuse has operated.
Typical test circuits for a.c. and d.c. are given in Figure 4.
S
A
C
L
R
D
F
S
C
A
L
R
D
F
IEC
Figure 4a – Typical test circuit for breaking capacity tests for fuse-links
with breaking capacity greater than 100 A
S A
C
R
F
D
S A
C
R
F
D
IEC
Figure 4b – Typical test circuit for breaking capacity tests for fuse-links
with breaking capacity less or equal than 100 A
Components
A removable link used for calibration S source of supply, impedance less than 10 % of the
total impedance of the circuit
C contactor that makes the circuit L air-cored inductance
D switch to disconnect the source of supply R series resistor, adjusted to obtain correct prospective
current
F fuse-link under test
Figure 4 – Test circuits for breaking capacity tests

In principle, the rated breaking capacity (a.c. and/or d.c.) and associated power factor or time
constant, respectively, shall be specified by the manufacturer. The values given in the table
below are reference values only.
The specified rated breaking capacity shall not be less than 35 A or 10 times the rated current,
whichever is greater.
Unless otherwise stated by the manufacturer, the power factor and time constant of the test
circuit shall be chosen from Table 1.
Table 1 – Power factor and time constant
Test current Power factor Time constant
up to 100 A
>0,95 <1 ms
above 100 A up to 500 A 0,8 to 0,9 1 ms to 1,7 ms
above 500 A up to 1 500 A 0,7 to 0,8 2 ms to 2,5 ms
above 1 500 A up to 10 000 A 0,5 to 0,6 4,5 ms to 5 ms
above 10 000 A up to 25 000 A 0,3 to 0,4 9 ms to 10 ms
above 25 000 A up to 50 000 A 0,2 to 0,3 12,5 ms to 15 ms

For tests at lower prospective currents (5 I , 10 I , 50 I , 250 I ), the inductance of the circuit
N N N N
shall remain constant and the current shall be adjusted by changing the resistance only.
9.3.2 Criteria for satisfactory performance
Addition, after third paragraph:
In addition to the failure criteria described in IEC 60127-1, the fuse-link shall operate
satisfactorily in all tests without any of the following phenomena:
– fusing together of the contacts;
– illegibility of marking after test;
– piercing of end caps (if applicable), visible to the naked eye;
– piercing of the external surfaces, visible to the naked eye;
– scorching or melting of organic substances on the external surfaces.
The following phenomena are neglected:
– black spots or other marks on the fuse-link terminations;
– small deformations of the fuse-link;
– cracking of the fuse-link, unless it causes the fuse-link to fall apart during replacement.
9.3.4 Type test for fuse-links of homogenous series
Addition, after second paragraph:
Fuse-links having an intermediate rated current shall be tested according to the relevant
testing schedule for intermediate ampere ratings of a homogenous series given in Table 7.
9.4 Endurance tests
a) Replacement of the first sentence as follows:
The test current I (A) is passed through the fuse-link for a period of 1 h. The minimum
test
value for I (A) is 1,0 I .
test N
– 18 – IEC 60127-7:2015 © IEC 2015
b) Replacement of the first sentence as follows:
The test current I (A) is then passed through the fuse-link for a period of 1 h.
OVL
c) Addition:
The voltage drop shall not exceed the maximum value specified in standard sheet 1.
Additional subclauses:
9.4.101 Endurance test at normal ambient temperature
Compliance is checked by subjecting the fuse-links to test method A or test method B.
Choice of either method A or method B shall be as agreed upon with the manufacturer. This
also applies to the test currents to be selected among I (A), I (B), I (A) and I (B).
test test OVL OVL
9.4.102 Test method A
As specified in IEC 60127-1:2006, 9.4 a) to d), with test current I (A) for 9.4 a) and I (A)
test OVL
for 9.4 b).
9.4.103 Test method B
The test sequence has to be as follows:
a) The d.c. current I (B) is passed through the fuse-link for a period of 100 h. The
test
minimum value for I (B) is 0,8 I .
test N
The current stability during the test shall be maintained within ±1 % of the adjusted value.
The d.c. current I (B) is then passed through the fuse-link for a period of 1 h.
OVL
b) At the end of this test the voltage drop across the fuse-link is measured and used for the
calculation of the maximum sustained dissipation.
c) Finally, the voltage drop across the fuse-link is measured again according to 9.1. The
voltage drop shall not have increased by more than 10 % of the value measured before
the test and shall not exceed the maximum value specified in standard sheet 1.
d) After the test, the marking shall still be legible and soldered joints on the fuse-link
terminations shall not show any appreciable changes.
NOTE Changes in colour are not considered a failure.
9.5 Maximum sustained dissipation
Subclause 9.5 of IEC 60127-1:2006 applies.
9.6 Pulse tests
Replacement:
None specified.
9.7 Fuse-link temperature
Additional subclauses:
9.7.101 Fuse-links for use on printed circuit boards
For fuse-links designed to be mounted on circuit boards, compliance is checked by subjecting
the fuse-links to test method I or method II as requested by the manufacturer.
Test method I
As specified in IEC 60127-1:2006, 9.7, with replacement of the maximum temperature rise of
135 K by 150 K for terminals and 135 K for plastic body materials. The initial current shall be
I (A) or I (B) depending on which test method of 9.4 has been chosen.
OVL OVL
The temperature during the last 30 s prior to opening shall be ignored.
Test method II
The temperature rise above ambient temperature shall be measured on the terminals of the
fuse-links soldered to the relevant test board, using a fine-wire thermocouple not larger than
0,21 mm .
The measurement shall be done during the final 5 min of the endurance test at I (A) or
OVL
I (B) depending on which test method of 9.4 has been chosen. The temperature rise shall
OVL
not exceed 95 K.
Fuse-link numbers 1, 2, 3, 4, 5 and 6 shall be used for this test and fuse-link numbers 43, 44
and 45 in Table 2, or 58, 59 and 60 in Table 3, shall be kept as additional spares.
9.7.102 Fuse-links for use in fuse-holders
For fuse-links intended to be inserted in specifically designed fuse-holders, the test according
to IEC 60127-6:1994, Clause 14, shall be carried out using the fuse-links to be tested instead
of the required dummy fuse-links.
After the test in 14.1 of IEC 60127-6:1994, the inspection according to IEC 60127-6:1994,
12.2, shall not be performed.
– 20 – IEC 60127-7:2015 © IEC 2015

Table 2 – Testing schedule for individual ampere ratings for a.c. or d.c. breaking capacity fuse-links
Subclause Description Fuse-link number
b b
E1 E4
1 4 7 10 13 16 19 22 25 28 31 34 37 40 43 46 49
b b
E2 E5
2 5 8 11 14 17 20 23 26 29 32 35 38 41 44 47 50
b b
E3 E6
3 6 9 12 15 18 21 24 27 30 33 36 39 42 45 48 51
9.7 Fuse-link temperature        X
9.4 Endurance tests X X
9.2.2 Test at elevated temperature  X
9.2.1 Time/current characteristic 10 I at 10 I    X
N N
normal ambient temperature
4,0 I     X
N
2,75 I       X
N
2,0 I or 2,1 I         X
N N
9.3 Breaking capacity
Rated breaking capacity   X
5 times the rated current 5 I    X
N
10 times the rated current 10 I      X
N
a
50 times the rated current 50 I      X
N
a
250 times the rated current 250 I       X
N
9.3.3 Insulation resistance   X X  X X X
8.3 Fuse-link terminations         X X
8.5 Soldered joints X X   X X   X X X
6.2 Legibility and indelibility of marking    X X   X X X
a
Applicable only when the rated breaking capacity is not exceeded.
b
The extra samples for termination test (E1 to E6) have to be chosen by random and not sorted by voltage drop.

Table 3 – Testing schedule for individual ampere ratings for a.c. and d.c. breaking capacity fuse-links
Subclause Description Fuse-link number
b b
E1 E4
1 4 7 10 13 16 19 22 25 28 31 34 37 40 43 46 49 52 55 58 61
b b
E2 E5
2 5 8 11 14 17 20 23 26 29 32 35 38 41 44 47 50 53 56 59 62
b b
E3 E6
3 6 9 12 15 18 21 24 27 30 33 36 39 42 45 48 51 54 57 60 63
9.7 Fuse-link temperature          X
9.4 Endurance tests X X
9.2.2 Test at elevated temperature  X
9.2.1 Time/current characteristic 10 I      X
N
at normal ambient temperature
4,0 I      X
N
X
2,75 I
N
2,0 I or 2,1 I           X

N N
9.3 Breaking capacity
Rated breaking
...