SIST EN IEC 60127-9:2025

SLOVENSKI STANDARD
01-december-2025
Miniaturne varovalke - 9. del: Miniaturni taljivi vložki za posebne namene z delno
izklopno zmogljivostjo (IEC 60127-9:2025)
Miniature fuses - Part 9: Miniature fuse-links for special applications with partial-range
breaking capacity (IEC 60127-9:2025)
Geräteschutzsicherungen – Teil 9: G-Sicherungseinsätze für besondere Anwendungen
mit Teilbereichsausschaltvermögen (IEC 60127-9:2025)
Coupe-circuits miniatures - Partie 9: éléments de remplacement miniatures pour
applications spéciales à pouvoir de coupure partiel (IEC 60127-9:2025)
Ta slovenski standard je istoveten z: EN IEC 60127-9:2025
ICS:
29.120.50 Varovalke in druga Fuses and other overcurrent
nadtokovna zaščita protection devices
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 60127-9

NORME EUROPÉENNE
EUROPÄISCHE NORM October 2025
ICS 29.120.50
English Version
Miniature fuses - Part 9: Miniature fuse-links for special
applications with partial-range breaking capacity
(IEC 60127-9:2025)
Coupe-circuits miniatures - Partie 9: Éléments de Geräteschutzsicherungen - Teil 9: G-Sicherungseinsätze für
remplacement miniatures pour applications spéciales à besondere Anwendungen mit
pouvoir de coupure partiel Teilbereichsausschaltvermögen
(IEC 60127-9:2025) (IEC 60127-9:2025)
This European Standard was approved by CENELEC on 2025-09-10. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60127-9:2025 E

European foreword
The text of document 32C/667/FDIS, future edition 1 of IEC 60127-9, prepared by SC 32C "Miniature
fuses" of IEC/TC 32 "Fuses" was submitted to the IEC-CENELEC parallel vote and approved by
CENELEC as EN IEC 60127-9:2025.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2026-10-31
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2028-10-31
document have to be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
This document is read in conjunction with EN IEC 60127-1:2024.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 60127-9:2025 was approved by CENELEC as a European
Standard without any modification.
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
NOTE 1  Where an International Publication has been modified by common modifications, indicated by (mod),
the relevant EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cencenelec.eu.
Publication Year Title EN/HD Year
IEC 60068-2-21 2021 Environmental testing - Part 2-21: Tests - EN IEC 60068-2-21 2021
Test U: Robustness of terminations and
integral mounting devices
IEC 60127-1 2023 Miniature fuses - Part 1: Definitions for EN IEC 60127-1 2024
miniature fuses and general requirements
for miniature fuse-links
IEC 60127-6 2023 Miniature fuses - Part 6: Fuse-holders for EN IEC 60127-6 2024
miniature fuse-links
IEC 60664-1 2020 Insulation coordination for equipment EN IEC 60664-1 2020
within low-voltage supply systems - Part 1:
Principles, requirements and tests
IEC 60695-2-12 2021 Fire hazard testing - Part 2-12: EN IEC 60695-2-12 2021
Glowing/hot-wire based test methods -
Glow-wire flammability index (GWFI) test
method for materials
IEC 60695-2-13 2021 Fire hazard testing - Part 2-13: EN IEC 60695-2-13 2021
Glowing/hot-wire based test methods -
Glow-wire ignition temperature (GWIT) test
method for materials
IEC 60695-4 2021 Fire hazard testing - Part 4: Terminology EN IEC 60695-4 2021
concerning fire tests for electrotechnical
products
IEC 61249-2-7 2002 Materials for printed boards and other EN 61249-2-7 2002
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
- - + AC 2005
ISO 3 1973 Preferred numbers - Series of preferred - -
numbers
IEC 60127-9 ®
Edition 1.0 2025-08
INTERNATIONAL
STANDARD
Miniature fuses -
Part 9: Miniature fuse-links for special applications with partial-range breaking
capacity
ICS 29.120.50  ISBN 978-2-8327-0615-2

IEC 60127-9:2025-08(en)
IEC 60127-9:2025 © IEC 2025
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 . 9
6.4 Colour coding for miniature fuse-links for special applications . 9
7 General notes on tests . 10
7.3 Type tests . 10
7.4 Fuse-bases for tests . 11
7.5 Nature of supply . 16
8 Dimensions and construction . 16
8.2 Construction. 16
8.3 Terminations . 17
9 Electrical requirements . 17
9.1 Voltage drop . 17
9.2 Time/current characteristic . 18
9.2.1 Time/current characteristic at normal ambient temperature . 18
9.2.2 Test at elevated temperature . 18
9.3 Breaking capacity . 18
9.3.2 Operating conditions . 18
9.3.3 Criteria for satisfactory performance . 20
9.3.5 Type test for fuse-links of homogenous series. 20
9.4 Endurance tests . 20
9.4.101 Endurance test at normal ambient temperature . 21
9.4.102 Test method A . 21
9.4.103 Test method B . 21
9.5 Maximum sustained dissipation . 21
9.6 Pulse tests . 21
9.7 Fuse-link temperature . 22
9.7.101 Fuse-links for use on printed circuit boards . 22
9.7.102 Fuse-links for use in fuse-holders . 22
101 Standard sheets . 29
101.1 Standard sheet 1 – Fuse-links for special applications . 29
Annex AA (normative) Guidance on ratings to be specified by the manufacturer or to
be agreed upon with the testing house . 32
Bibliography . 33

Figure 101 – Standard test board for fuse-links with wire terminations . 12
Figure 102 – Test board for surface mount fuse-links . 14
Figure 103 – Test fuse base . 15
Figure 104 – Test circuits for breaking capacity tests . 19

IEC 60127-9:2025 © IEC 2025
Table 101 – Copper track specifications for test board for surface mount fuse-links. 16
Table 102 – Power factor and time constant . 20
Table 103 – Testing schedule for individual ampere ratings for AC or DC breaking
capacity fuse-links . 23
Table 104 – Testing schedule for individual ampere ratings for AC and DC breaking
capacity fuse-links . 24
Table 105 – Testing schedule for maximum ampere rating of a homogeneous series
(AC or DC breaking capacity fuse-links) . 26
Table 106 – Testing schedule for maximum ampere rating of a homogeneous series
(AC and DC breaking capacity fuse-links) . 27
Table 107 – Testing schedule for minimum ampere rating of a homogeneous series. 28
Table 108 – Testing schedule for all intermediate ampere ratings of a homogeneous
series . 28
Table AA.1 – Guidance on ratings to be specified by the manufacturer or to be agreed
upon with the testing house . 32

IEC 60127-9:2025 © IEC 2025
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Miniature fuses -
Part 9: Miniature fuse-links for special applications
with partial-range breaking capacity

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) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
may be required to implement this document. However, implementers are cautioned that this may not represent
the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
IEC 60127-9 has been prepared by subcommittee 32C: Miniature Fuses, of IEC technical
committee 32: Fuses. It is an International Standard.
This International Standard is to be used in conjunction with IEC 60127-1:2023.
This part of IEC 60127 is to be read in conjunction with Part 1. It supplements or modifies the
corresponding clauses of Part 1. Where the text indicates an "addition" to or a "replacement"
of the relevant provision of Part 1, these changes are made to the relevant text of Part 1. When
a particular subclause of Part 1 is not mentioned in this part, that subclause applies as far as
is reasonable.
Additional specific provisions to those in Part 1, given as individual clauses or subclauses, are
numbered starting from 101.
IEC 60127-9:2025 © IEC 2025
NOTE The following numbering system is used:
– subclauses, tables and figures that are numbered starting from 101 are additional to those in Part 1;
– unless notes are in a new subclause or involve notes in Part 1, they are numbered starting from 101, including
those in a replaced clause or subclause;
– additional annexes are lettered AA, BB, etc.
The text of this International Standard is based on the following documents:
Draft Report on voting
32C/667/FDIS 32C/670/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
A list of all parts in the IEC 60127 series, published under the general title Miniature fuses, can
be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
IEC 60127-9:2025 © IEC 2025
INTRODUCTION
According to the wish expressed by the users of miniature fuses, all standards,
recommendations and other documents relating to miniature fuses 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, Miniature fuses - Part 8: Fuse resistors with particular overcurrent protection
IEC 60127-9, Miniature fuses - Part 9: Miniature fuse-links for special applications with partial-
range breaking capacity
IEC 60127-9:2025 © IEC 2025
1 Scope
This part of IEC 60127 covers requirements for miniature fuse-links for special applications with
partial-range breaking capacity.
This document is applicable to fuse-links with a rated voltage not exceeding 1 000 V, a rated
current not exceeding 150 A and a rated breaking capacity not exceeding 50 kA.
Miniature fuse-links with partial-range breaking capacity are used only to operate under short
circuit conditions. They cannot be applied under overload conditions.
The design engineer needs to ensure no overload conditions can be seen by the fuse approved
under this document.
This document does not apply to fuses completely covered by IEC 60127-7 or 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 with partial-range breaking capacity are not
intended to be replaced by the end-user of an electrical / electronic appliance.
The object of this document is to establish uniform test methods for miniature fuse-links for
special applications with partial-range breaking capacity, so as to allow verification of the values
(for example melting time and breaking capacity values) specified by the manufacturer.
WARNING – If this fuse is used without additional protection in the forbidden overload
partial current range it will catch fire, explode and will not interrupt the current. As a
user of this product, you must ensure this scenario can be excluded in all cases.

2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies.
For undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60068-2-21:2021, Environmental testing - Part 2-21: Tests - Test U: Robustness of
terminations and integral mounting devices
IEC 60127-1:2023, Miniature fuses - Part 1: Definitions for miniature fuses and general
requirements for miniature fuse-links
IEC 60127-6:2023, Miniature fuses - Part 6: Fuse-holders for miniature fuse-links
IEC 60664-1:2020, Insulation coordination for equipment within low-voltage systems - Part 1:
Principles, requirements and tests
IEC 60695-2-12:2021, 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 60127-9:2025 © IEC 2025
IEC 60695-2-13:2021, 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 60695-4:2021, 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 60127-1:2023, except 3.5, and the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
3.1
miniature fuse-link for special applications with partial-range breaking capacity
enclosed fuse-link which is not covered in IEC 60127-2, IEC 60127-3, IEC 60127-4 or
IEC60127-7 and of rated breaking capacity not exceeding 50 kA, with a width and height or
diameter 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 or diameter not exceeding 12 mm.
3.2
t to t
1 6
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
IEC 60127-9:2025 © IEC 2025
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
3.8
minimum breaking current I
min
minimum value of prospective current that a fuse-link is capable of breaking at a stated voltage
under prescribed conditions of use and behaviour and that is defined as:
2,1 I < I ≤ 4 I
N min N
Note 1 to entry: The value of I is defined by the manufacturer.
min
Note 2 to entry: If a current below this threshold and above the nominal current is flowing through the device it may
catch fire, desolder, overheat or plainly explode. This region of current is forbidden for the user application and is
avoided in all cases.
4 General requirements
Clause 4 of IEC 60127-1:2023 applies.
5 Standard ratings
Clause 5 of IEC 60127-1:2023 does not apply.
Replacement:
The following ratings shall be agreed upon between the testing house and the manufacturer
(see Annex AA):
– rated voltage;
– rated current (see standard sheet 1 for preferred ratings);
– rated breaking capacity (AC and/or DC);
– minimum breaking current I (AC and/or DC);
min
– time/current characteristic.
The following may be agreed upon on an optional basis:
– test at elevated temperature;
– time/current characteristic (additional optional currents not required or defined by this
standard).
Any additional specified values are given in standard sheet 1.
IEC 60127-9:2025 © IEC 2025
6 Marking
Clause 6 of IEC 60127-1:2023 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).
g) minimum breaking current.
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 as well as the minimum breaking current (I ).
min
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 60127-1:2023, 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.
IEC 60127-9:2025 © IEC 2025
7 General notes on tests
Clause 7 of IEC 60127-1:2023 applies except as follows.
7.3 Type tests
7.3.1
Replacement:
For testing the individual current ratings of fuses with AC or DC breaking capacity, the number
of fuse-links required is 48, of which 12 are kept as spares. For fuse-links with wire terminations
six extra samples (E1 to E6) shall 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 103.
For testing the individual current ratings of fuses with AC and DC breaking capacity, the number
of fuse-links required is 60, of which 9 are kept as spares. For fuse-links with wire terminations
six extra samples (E1 to E6) shall 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 104.
For testing the maximum ampere rating of a homogenous series with AC or DC breaking
capacity the number of fuse-links required is 48, of which 22 are kept as spares. For fuse-links
with wire terminations six extra samples (E1 to E6) shall 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 105.
For testing the maximum ampere rating of a homogenous series with AC and DC breaking
capacity the number of fuse-links required is 63, of which 32 are kept as spares. For fuse-links
with wire terminations six extra samples (E1 to E6) shall 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 106.
For testing the minimum ampere rating of a homogenous series with AC and / or DC breaking
capacity the number of fuse-links required is 38, of which 1
...