SIST EN IEC 60127-4:2026

SLOVENSKI STANDARD
01-december-2026
Miniaturne varovalke - 4. del: Univerzalni modularni taljivi vložki - Skoznji vložki in
vložki za površinsko montažo (IEC 60127-4:2026)
Miniature fuses - Part 4: Universal modular fuse-links (UMF) - Through-hole and surface
mount types (IEC 60127-4:2026)
Geräteschutzsicherungen - Teil 4: Welteinheitliche modulare Sicherungseinsätze (UMF)
- Bauarten für Steck- und Oberflächenmontage (IEC 60127-4:2026)
Coupe-circuit miniatures - Partie 4: Éléments de remplacement modulaires universels
(UMF) - Types de montage à trou traversant et en surface (IEC 60127-4:2026)
Ta slovenski standard je istoveten z: EN IEC 60127-4:2026
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 60127-4

NORME EUROPÉENNE
EUROPÄISCHE NORM September 2026
ICS 29.120.50 Supersedes EN 60127-4:2005; EN 60127-
4:2005/A1:2009; EN 60127-4:2005/A2:2013
English Version
Miniature fuses - Part 4: Universal modular fuse-links (UMF) -
Through-hole and surface mount types
(IEC 60127-4:2026)
Coupe-circuit miniatures - Partie 4: Éléments de Geräteschutzsicherungen - Teil 4: Welteinheitliche
remplacement modulaires universels (UMF) - Types de modulare Sicherungseinsätze (UMF) - Bauarten für Steck-
montage à trou traversant et en surface und Oberflächenmontage
(IEC 60127-4:2026) (IEC 60127-4:2026)
This European Standard was approved by CENELEC on 2026-08-10. 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
© 2026 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60127-4:2026 E

European foreword
The text of document 32C/676/FDIS, future edition 4 of IEC 60127-4, 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 60127-4:2026.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2027-09-30
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2029-09-30
document have to be withdrawn
This document supersedes EN 60127-4:2005 and all of its amendments and corrigenda (if any).
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 60127-4:2026 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standard indicated:
IEC 60115-1:2020 NOTE Approved as EN 60115-1:2023
IEC 60115-8:2023 NOTE Approved as EN IEC 60115-8:2026 (not modified) +A11:2026
IEC 61190-1-2:2014 NOTE Approved as EN 61190-1-2:2014 (not modified)
IEC 61191-2:2017 NOTE Approved as EN 61191-2:2017 (not modified)
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 60068-2-20 2021 Environmental testing - Part 2-20: Tests - EN IEC 60068-2-20 2021
Test Ta and Tb: Test methods for
solderability and resistance to soldering
heat of devices with leads
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 60068-2-58 2015 Environmental testing - Part 2-58: Tests - EN 60068-2-58 2015
Test Td: Test methods for solderability,
resistance to dissolution of metallization
and to soldering heat of surface mounting
devices (SMD)
+ A1 2017 + A1 2018
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 60194 2021 Printed boards design, manufacture and - -
assembly - Vocabulary - Part 1: Common
usage in printed board and electronic
assembly technologies
IEC 60216-1 2013 Electrical insulating materials - Thermal EN 60216-1 2013
endurance properties - Part 1: Ageing
procedures and evaluation of test results
IEC 60664-1 2020 Insulation coordination for equipment EN IEC 60664-1 2020
within low-voltage supply systems - Part 1:
Principles, requirements and tests
+AC 2020
+ AMD1 2025 + A1 2025
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
- - + corrigendum Sep. 2005
ISO 3 1973 Preferred numbers - Series of preferred - -
numbers
IEC 60127-4 ®
Edition 4.0 2026-03
INTERNATIONAL
STANDARD
Miniature fuses -
Part 4: Universal modular fuse-links (UMF) - Through-hole and surface mount
types
ICS 29.120.50  ISBN 978-2-8327-1098-2

IEC 60127-4:2026-03(en)
IEC 60127-4:2026 © IEC 2026
CONTENTS
FOREWORD . 2
INTRODUCTION . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
4 General requirements . 6
5 Standard ratings . 6
6 Marking . 7
7 General notes on tests . 7
8 Dimensions and construction . 9
9 Electrical requirements . 11
10 Standard sheets . 25
Annex A (informative) Mounting for surface mount fuse-links . 30
Annex B (normative) Dimensional details for the 'tulip' graphical symbol of UMFs . 32
Bibliography . 33

Figure 1 – Unique identifying symbol for UMFs (IEC 60417-6328) . 18
Figure 2 – Test board for through-hole fuse-links . 18
Figure 3 – Test board for surface mount fuse-links . 20
Figure 4 – Test fuse-base lower than 35 A . 21
Figure 5 – Test fuse-base equal to and higher than 35 A . 22
Figure 6 – Bending jig for surface mount fuse-links . 22
Figure 7 – Test circuits for breaking capacity tests . 23
Figure A.1 – Parameters for reflow temperature . 31
Figure B.1 – Dimensional details for the 'tulip' graphical symbol of UMFs . 32

Table 1 – Cross-sectional area of copper conductors . 8
Table 2 – Maximum values of voltage drop and sustained power dissipation . 14
Table 3 – Testing schedule for individual current ratings . 16
Table 4 – Testing schedule for maximum current rating of a homogeneous series . 17
Table 5 – Testing schedule for minimum current rating of a homogeneous series . 17
Table 6 – Preferred copper track specifications for test board . 24

IEC 60127-4:2026 © IEC 2026
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Miniature fuses -
Part 4: Universal modular fuse-links (UMF) -
Through-hole and surface mount types

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 60127-4 has been prepared by subcommittee 32C: Miniature fuses, of IEC technical
committee 32: Fuses. It is an International Standard.
This fourth edition cancels and replaces the third edition published in 2005, Amendment 1:2008
and Amendment 2:2012. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) align to IEC 60127-1:2023, third edition;
b) enhance the rated current of UMFs to 100A and provide the corresponding maximum voltage
drop and maximum sustained dissipation;
c) modify the figures;
d) update the normative references to the latest version.
IEC 60127-4:2026 © IEC 2026
This International Standard is to be used in conjunction with IEC 60127-1:2023
The text of this International Standard is based on the following documents:
Draft Report on voting
32C/676/FDIS 32C/680/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.
This document is to be used in conjunction with IEC 60127-1:2023.
This document supplements or modifies the corresponding clauses in IEC 60127-1:2023, so as
to convert that publication into the IEC standard: Universal modular fuse-links (UMF) – Through-
hole and surface mount types.
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 60127-4:2026 © IEC 2026
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 and subclauses containing general
requirements need not be repeated.
The new IEC 60127 series is thus subdivided as follows:
IEC 60127, Miniature fuses (general title)
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 60127-10 (withdrawn)
This part of IEC 60127 covers additional requirements, test equipment and standard sheets.
The SI system of units is used throughout this standard.

IEC 60127-4:2026 © IEC 2026
1 Scope
This part of IEC 60127 relates to universal modular fuse-links (UMF) for printed circuits and
other substrate systems, used for the protection of electric appliances, electronic equipment,
and component parts thereof, normally intended to be used indoors.
It does not apply to fuse-links for appliances intended to be used under special conditions, such
as in a corrosive or explosive atmosphere.
These fuses are normally intended to be mounted or replaced only by appropriately skilled
persons using specialized equipment.
This document applies in addition to the requirements of IEC 60127-1.
The objectives of this part of IEC 60127 are as given in IEC 60127-1, with the additional
requirement of a degree of non-interchangeability.
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 60068-2-20:2021, Environmental testing - Part 2-20: Tests - Test Ta and Tb: Test methods
for solderability and resistance to soldering heat of devices with leads
IEC 60068-2-21:2021, Environmental testing - Part 2-21: Tests - Test U: Robustness of
terminations and integral mounting devices
IEC 60068-2-58:2015, Environmental testing - Part 2-58: Tests - Test Td: Test methods for
solderability, resistance to dissolution of metallization and to soldering heat of surface mounting
devices (SMD)
IEC 60068-2-58:2015/AMD1:2017
IEC 60127-1:2023, Miniature fuses - Part 1: Definitions for miniature fuses and general
requirements for miniature fuse-links
IEC 60194:2021 (all parts), Printed boards design, manufacture and assembly - Vocabulary
IEC 60216-1:2013, Electrical insulating materials - Thermal endurance properties - Part 1:
Ageing procedures and evaluation of test results
IEC 60664-1:2020, Insulation coordination for equipment within low-voltage supply systems -
Part 1: Principles, requirements and tests
IEC 60664-1:2020/AMD1:2025
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
IEC 60127-4:2026 © IEC 2026
3 Terms and definitions
For the purposes of this document, the terms and definitions given in Clause 3 of
IEC 60127-1:2023 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
through-hole fuse-link
UMF designed for soldering directly into a printed wiring board, with insertion of its
terminations/leads in suitably designed holes
3.2
surface mount fuse-link
UMF designed for direct conductive attachment by solder or other means on to the surface of
a substrate, without insertion of its terminations/leads in suitably designed holes or sockets
3.3
land
portion of a conductive pattern usually but not exclusively used for the connection and/or
attachment of components (see IEC 60194)
Note 1 to entry: Further definitions which may be useful in the application of surface mount fuse-links may be found
in IEC 60115-1 and IEC 60115-8.
4 General requirements
Clause 4 of IEC 60127-1:2023 applies.
5 Standard ratings
5.1 Rated voltage
See Clause 10 standard sheets.
5.2 Rated current
See Table 2 for preferred rated ratings.
5.3 Rated breaking capacity
See Clause 10 standard sheets.
IEC 60127-4:2026 © IEC 2026
6 Marking
In addition to the requirements of Clause 6 of IEC 60127-1:2023, the following criteria
concerning UMF shall be observed and marked:
6.1 Addition:
e) For fuse-links rated at 250 V, a symbol denoting the breaking capacity. This symbol shall
be placed between the marking for rated current and the marking for rated voltage.
These symbols are as follows:
H: denoting high-breaking capacity;
I: denoting intermediate-breaking capacity;
L: denoting low-breaking capacity.
f) The distinctive symbol shown in Figure 1 (see Annex B for more details).
g) The letters AC before the voltage for devices designed solely for alternating current
application.
6.4 Colour coding for universal modular fuse-links
Not applicable.
6.5 Space limitations for markings
Where marking is impractical 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
In addition to the requirements of Clause 7 of IEC 60127-1:2023, the following criteria shall be
observed:
7.2 Atmospheric conditions for testing
7.2.1 Addition:
For testing of individual fuse ratings according to standard sheets 1 and 2, see Table 3. For
fuse-links designed and rated both for AC and DC, the number of fuse-links required is 63. For
fuse-links designed only for AC, the number of fuse-links required is 48. There are nine spares
(fuse-link numbers 10, 11, 12, .37, 38, 39, 52, 53 and 54).
For the maximum current rating of a homogeneous series according to standard sheets 1 and
2, see Table 4. For fuse-links designed and rated both for AC and DC, the number of fuse-links
required is 53. For fuse-links designed only for AC, the number of fuse-links required is 48.
There are 19 spares (fuse-link numbers 19, 20, 21, 32 to 41, 45, 46, 47, 51, 52 and 53).
For the minimum current rating of a homogeneous series according to standard sheets 1 and
2, see Table 5. For fuse-links designed and rated both for AC and DC, the number of fuse links
required is 38. For fuse-links designed only for AC, the number of fuse-links required is 33.
There are 16 spares (fuse-link numbers 10, 11, 12, 23 to 32, 36, 37 and 38).
IEC 60127-4:2026 © IEC 2026
7.4 Fuse-bases for tests
Replacement:
7.4.1 General requirements
Fuse-links shall be mounted upon the appropriate test board (see 7.3.2 or 7.3.3 as appropriate)
by soldering.
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;
− the nominal thickness of copper layer shall be in accordance with Table 6.
The manufacturer shall declare the PCB (printed circuit board) parameters listed in Table 6
and provide assembled PCBs for the tests.
This test board shall then be mounted on the test fuse-base (Figure 4 or Figure 5). 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.
When two or more fuse-links are tested in series, the test fuse-bases shall be located so that
there will be a spacing of not less than 50 mm between any two fuse-links under test. The
conductor connecting the test fuse-bases together and connecting the test fuse-bases to the
ammeter and the source of supply shall be insulated copper wire. The length of each conductor
shall be 250 mm for rated currents below and including 10A, and the cross-sectional area of
the wire shall be approximately 1 mm .
For rated currents above 10 A the length of each conductor shall be at least 500 mm, and the
cross-sectional area of the wire shall be according to Table 1.
Table 1 – Cross-sectional area of copper conductors
Rated current Cross-sectional area of copper conductors
A
mm
Up to and including 10 1
More than 10, and up to and including 16 2,5
More than 16, and up to and including 25 4
More than 25, and up to and including 35 6
More than 35, and up to and including 60 35
More than 60, and up to and including 100 50

7.4.2 Through-hole fuse-links (standard sheet 1)
For electrical tests upon fuse-links covered by standard sheet 1, the fuse-link shall be mounted
on the test board, as shown in Figure 2 in the pair of holes appropriate to the spacing of the
terminations/leads.
7.4.3 Surface mount fuse-links (standard sheet 2)
For electrical tests upon fuse-links covered by standard sheet 2, the fuse-link shall be mounted
on the test board A, as shown in Figure 3. See Annex A for guidance. If it is impracticable to
maintain the distance between voltage drop connections, then test board B may be used.
IEC 60127-4:2026 © IEC 2026
8 Dimensions and construction
Replacement:
8.1 Dimensions
The dimensions of the UMFs shall comply with the relevant standard sheets.
Compliance is checked by measurement of length, width and height.
For fuse-links to standard sheet 1, the termination/leads spacing is checked. Through-hole fuse-
links are only limited to 20 A. The termination shall pass through a 1 mm in diameter hole. The
length of the termination is not specified as this is subject to the method of packaging.
8.2 Construction
The fuse-element shall be completely enclosed.
The UMF shall withstand the heat and chemical exposure of a printed circuit board or other
substrate assembly operations with its performance unimpaired.
Compliance is checked by the resistance to soldering heat test as specified in 8.7.
8.3 Terminations
8.3.1 Through-hole fuse-links
Terminations/leads shall be firmly attached so that it is not possible to remove them without
damaging the UMF.
Compliance is checked by carrying out the following test.
The samples are preconditioned by immersion in water for 24 h at a temperature between 15 °C
and 35 °C.
The tests are carried out in accordance with IEC 60068-2-21.
The following tests shall be applied:
– tensile test Ua , applied force 10 N;
– thrust test Ua , applied force 2 N;
– bending test Ub, applied force 5 N, number of bends: 1.
The sample size is two fuse-links for each test. After testing, the terminations/leads shall remain
firmly attached. The voltage drop shall be measured in accordance with 9.1 and shall not exceed
the maximum allowed in Table 2. Bending test Ub is omitted if the terminations/leads are less
than 5 mm in length.
8.3.2 Surface mount fuse-links
The fuse-links shall be mounted on the test board as shown in Figure 3. The test board, with
the fuse-links on the underside, shall be placed in the bending jig as shown in Figure 6. The
board shall then be bent by 1 mm at a rate of 1 mm/s. The test board shall be allowed to recover
from the bent position, and then be removed from the test jig.
After the test, the terminations/leads shall remain firmly attached, and the voltage drop shall be
measured in accordance with 9.1 and shall not exceed the maximum allowed in Table 2.
IEC 60127-4:2026 © IEC 2026
8.4 Alignment and configuration of terminations
The termination configuration and spacing shall be as specified in the standard sheets.
NOTE 1 T
...