SIST EN IEC 60127-7:2026
(Main)Miniature fuses - Part 7: Miniature fuse-links for special application (IEC 60127-7:2026)
- Abstract
IEC 60127-7:2026 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 125 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.
- Status
- Published
- Public Enquiry End Date
- 30-Dec-2024
- Publication Date
- 13-Sep-2026
- Technical Committee
- EVA - Fuses
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 25-Aug-2026
- Due Date
- 30-Oct-2026
- Completion Date
- 14-Sep-2026
SIST EN IEC 60127-7:2026 is the Slovenian adoption of EN IEC 60127-7:2026, based on IEC 60127-7:2026. It specifies requirements and uniform test methods for miniature fuse-links for special applications, for manufacturers, testing houses, and anyone selecting or verifying these components.
What does SIST EN IEC 60127-7:2026 specify?
SIST EN IEC 60127-7:2026 covers miniature fuse-links for special applications and sets the ratings, marking, construction, test methods, and standard sheets used to verify them. It applies to fuse-links with a rated voltage not exceeding 1 000 V, a rated current not exceeding 125 A, and a rated breaking capacity not exceeding 50 kA.
The document is written to be used together with IEC 60127-1:2023. It supplements and modifies Part 1, and where Part 1 is not specifically changed, it applies as far as reasonable.
| Clause / annex | Content |
|---|---|
| 1-3 | Scope, normative references, terms and definitions |
| 4-9 | General requirements, ratings, marking, tests, dimensions, construction, electrical requirements |
| 10 | Standard sheets |
| Annex AA | Guidance on ratings to be specified by the manufacturer or agreed with the testing house |
| Bibliography | Related reference IEC 60269-1:2024 |
The scope also makes the intended use clear: these fuse-links are not meant to be replaced by the end-user of an appliance, and the standard is aimed at verification of manufacturer-declared values such as melting time and breaking capacity.
What are the key requirements of SIST EN IEC 60127-7:2026?
SIST EN IEC 60127-7:2026 combines product definition, test set-up, and acceptance criteria. In practice, it tells a manufacturer what to declare, a laboratory what to test, and a buyer or quality manager what evidence to ask for.
Ratings and marking
Clause 5 requires the rated voltage, rated current, rated breaking capacity, and time/current characteristic to be agreed between the manufacturer and the testing house. The time/current characteristic must at least be stated at 2,0 I or 2,1 I and at 10 I, with optional values at 2,75 I and 4 I. This matters because the product cannot be specified, tested, or compared correctly unless these key ratings are fixed first.
Clause 6 requires the type designation and the rated breaking capacity to be marked, and the package label must also carry the rated breaking capacity. Colour-band marking from IEC 60127-1:2023, Annex A, is not permitted here. If space is tight, the essential information is to be given on the smallest package and in the manufacturer’s literature.
Construction and test set-up
Clause 8 requires the fuse-element to be completely enclosed. Fuse-links must resist heat and fire, and plastic or organic body materials are tied to Glow-wire ignition temperature (GWIT) and Glow-wire flammability index (GWFI) limits. This is important for safety reviews because it links the component design to the fire behavior expected in real equipment.
Clause 8.3 applies only to fuse-links with wire terminations and requires corrosion-resistant terminations, secure attachment, and mechanical robustness checked with IEC 60068-2-21. The text gives tensile, thrust, and bending test methods, and the terminations must still be firmly attached afterward. In practice, this is the part that shows whether the fuse can survive handling, assembly, and service stresses.
Clause 7.4 defines the test hardware. Fuse-links intended for a special type of fuse-holder are tested in that fuse-holder, surface mount fuse-links use the test board in Figure 2, and wire-termination fuse-links use the test board in Figure 1. If several fuse-links are tested in series, spacing and conductor sizes are controlled, so the laboratory setup reflects the intended mounting method.
Electrical performance and type tests
Clause 9.1 says voltage drop is measured directly at the terminations or close to the body, with the test-board connection points used where applicable. This is the practical basis for checking losses and thermal behavior.
Clause 9.2 requires the manufacturer to define the time/current limits in standard sheet 1. Clause 9.3 requires breaking capacity testing for the declared AC, DC, or AC/DC rating, with the associated power factor or time constant, and the declared breaking capacity must not be less than 35 A or 10 times the rated current, whichever is greater. The pass criteria also forbid contact fusing, unreadable marking after test, visible piercing, and scorching or melting of organic external material.
Clause 9.4 gives two endurance test methods, A and B, and links them to the declared test currents. Clause 9.5 covers maximum sustained power dissipation, and Clause 9.7 gives temperature-rise checks for fuse-links on printed circuit boards and in fuse-holders. These clauses are the core qualification steps for deciding whether the fuse-link behaves safely under continuous load, overload, and installation conditions.
Clause 7.3 and Tables 104 to 109 define the sample numbers and testing schedules for individual ratings, homogeneous series, and intermediate ratings. That means certification and design validation are not ad hoc - they follow a fixed sample plan.
What terms does SIST EN IEC 60127-7:2026 define?
- Miniature fuse-link for special applications - An enclosed fuse-link outside IEC 60127-2, IEC 60127-3, and IEC 60127-4, with rated breaking capacity not exceeding 50 kA and maximum body dimensions of 12 mm by 12 mm by 50 mm.
- Rated breaking capacity - The declared current-interruption capability of the fuse-link, stated for AC, DC, or both.
- Time/current characteristic - The relationship between current and operating time, used to verify how quickly the fuse-link responds to overloads.
- Itest(A) - The test current used for endurance testing according to method A.
- Itest(B) - The test current used for endurance testing according to method B.
- GWIT - Glow-wire ignition temperature, used to judge ignition behavior of body materials.
- GWFI - Glow-wire flammability index, used to judge flammability behavior of body materials.
- Homogeneous series - A group of fuse-links tested through rated-current schedules that cover maximum, minimum, and intermediate current ratings.
Who uses SIST EN IEC 60127-7:2026?
SIST EN IEC 60127-7:2026 is used by fuse manufacturers, test laboratories, and certification bodies when qualifying miniature fuse-links for special applications. It is also used by equipment designers, quality managers, and buyers who need to confirm the fuse-link rating, marking, test method, and mounting conditions before approving a component for use.
The standard is particularly relevant where fuse-links are mounted on printed circuit boards or in specially designed fuse-holders, and where replacement by the end-user is not intended.
What changed in SIST EN IEC 60127-7:2026 from the previous edition?
SIST EN IEC 60127-7:2026 supersedes EN 60127-7:2016 and all of its amendments and corrigenda, if any. The text identifies these significant technical changes from the previous edition:
- alignment with IEC 60127-1:2023;
- change of the rated current of miniature fuse-links for special application to 125 A, with the related requirements;
- addition of a test board for surface mount fuse-links;
- addition of test schedules for homogeneous series.
Which standards are used with SIST EN IEC 60127-7:2026?
| Standard | What it contributes |
|---|---|
| IEC 60127-1:2023 | Definitions and general requirements for miniature fuse-links |
| IEC 60127-4:2026 | Related miniature fuse-link type for universal modular fuse-links |
| IEC 60127-6:2023 | Requirements for fuse-holders used with miniature fuse-links |
| IEC 60068-2-21:2021 | Mechanical robustness tests for terminations and integral mounting devices |
| IEC 60664-1:2020 | Insulation coordination basis used for spacing and related design choices |
| IEC 60695-2-12:2021 | Glow-wire flammability index test method |
| IEC 60695-2-13:2021 | Glow-wire ignition temperature test method |
| IEC 60695-4:2021 | Terminology for fire tests on electrotechnical products |
| IEC 61249-2-7:2002 | PCB base material specified for the surface-mount test board |
| ISO 3:1973 | Preferred number series used for intermediate rated currents |
IEC 60269-1:2024 is also named in the document as the standard that covers fuses outside the scope of this part.
What does the SIST EN IEC 60127-7:2026 document contain?
The document contains the test framework and the hardware definitions needed to verify miniature fuse-links for special applications. Figures 1 to 5 define the standard test board, the surface-mount board, the test fuse bases, and the AC/DC breaking-capacity circuits.
Tables 101 to 109 cover conductor cross-sections, copper-track specifications, power factor and time constant, and the sample schedules for different ratings and series types. Standard sheet 1 gives the preferred ratings, dimensions, maximum voltage drop, maximum sustained power dissipation, pre-arcing time/current limits, breaking-capacity guidance, endurance-test guidance, and temperature-rise guidance.
Annex AA gives guidance on which ratings are to be specified by the manufacturer or agreed with the testing house.
Relations
- Effective Date
- 30-Jun-2026
- Effective Date
- 30-Jun-2026
- Effective Date
- 30-Jun-2026
- Effective Date
- 30-Jun-2026
- Effective Date
- 30-Jun-2026
- Effective Date
- 30-Jun-2026
- Effective Date
- 30-Jun-2026
- Effective Date
- 30-Jun-2026
- Effective Date
- 30-Jun-2026
- Effective Date
- 30-Jun-2026
- Effective Date
- 25-Aug-2026
- Effective Date
- 25-Aug-2026
- Effective Date
- 25-Aug-2026
- Effective Date
- 25-Aug-2026
- Effective Date
- 25-Aug-2026
Get Certified
Connect with accredited certification bodies for this standard
IMQ S.p.A. (Certification)
Italian electrical product certification.
SLG Prüf- und Zertifizierungs GmbH
German testing and certification body.
UL Solutions
Global safety science company with testing, inspection and certification.
Sponsored listings
Frequently Asked Questions
SIST EN IEC 60127-7:2026 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Miniature fuses - Part 7: Miniature fuse-links for special application (IEC 60127-7:2026)". This standard covers: IEC 60127-7:2026 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 125 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.
IEC 60127-7:2026 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 125 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.
SIST EN IEC 60127-7:2026 is classified under the following ICS (International Classification for Standards) categories: 29.120.50 - Fuses and other overcurrent protection devices. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN IEC 60127-7:2026 has the following relationships with other standards: It is inter standard links to SIST EN IEC 60695-2-13:2021, SIST EN IEC 60664-1:2020, SIST EN IEC 60127-6:2025, SIST EN IEC 60695-2-12:2022, SIST ISO 3:1995, SIST EN IEC 60127-4:2026, SIST EN IEC 60127-1:2025, SIST EN 61249-2-7:2003, SIST EN IEC 60695-4:2021, SIST EN IEC 60068-2-21:2021, SIST EN 60335-1:2012, SIST EN 62841-2-21:2019, SIST EN 62841-3-12:2019, SIST EN IEC 62368-1:2024, SIST EN IEC 62368-1:2020. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
SIST EN IEC 60127-7:2026 is associated with the following European legislation: EU Directives/Regulations: 2014/35/EU; Standardization Mandates: M/511. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.
SIST EN IEC 60127-7:2026 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
01-oktober-2026
Miniaturne varovalke - 7. del: Miniaturni taljivi vložki za posebne namene (IEC
60127-7:2026)
Miniature fuses - Part 7: Miniature fuse-links for special application (IEC 60127-7:2026)
Geräteschutzsicherungen - Teil 7: G-Sicherungseinsätze für besondere Anwendungen
(IEC 60127-7:2026)
Coupe-circuit miniatures - Partie 7: Eléments de remplacement miniatures pour
applications spéciales (IEC 60127-7:2026)
Ta slovenski standard je istoveten z: EN IEC 60127-7:2026
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 60127-7
NORME EUROPÉENNE
EUROPÄISCHE NORM August 2026
ICS 29.120.50 Supersedes EN 60127-7:2016
English Version
Miniature fuses - Part 7: Miniature fuse-links for special
application
(IEC 60127-7:2026)
Coupe-circuit miniatures - Partie 7: Eléments de Geräteschutzsicherungen - Teil 7: G-Sicherungseinsätze für
remplacement miniatures pour applications spéciales besondere Anwendungen
(IEC 60127-7:2026) (IEC 60127-7:2026)
This European Standard was approved by CENELEC on 2026-07-01. 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 60127-7:2026 E
European foreword
The text of document 32C/679/FDIS, future edition 3 of IEC 60127-7, 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 60127-7:2026.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2027-08-31
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2029-08-31
document have to be withdrawn
This document supersedes EN 60127-7:2016 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 has been prepared under a standardization request addressed to CENELEC by the
European Commission. The Standing Committee of the EFTA States subsequently approves these
requests for its Member States.
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 60127-7:2026 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following note has to be added for the standard indicated:
IEC 60269-1:2024 NOTE Approved as EN IEC 60269-1:2025 (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 60068-2-21 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 60127-4 2026 Miniature fuses - Part 4: Universal modular - -
fuse-links (UMF) - Through-hole and
surface mount types
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
+ corrigendum Dec. 2020
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
- - + corrigendum Sep. 2005
ISO 3 1973 Preferred numbers - Series of preferred - -
numbers
IEC 60127-7 ®
Edition 3.0 2026-05
INTERNATIONAL
STANDARD
Miniature fuses -
Part 7: Miniature fuse-links for special application
ICS 29.120.50 ISBN 978-2-8327-1221-4
IEC 60127-7:2026-05(en)
IEC 60127-7:2026 © IEC 2026
CONTENTS
FOREWORD . 2
INTRODUCTION . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
4 General requirements . 7
5 Standard ratings . 7
6 Marking . 7
7 General notes on tests . 8
8 Dimensions and construction . 15
9 Electrical requirements . 16
10 Standard sheets . 26
Annex AA (normative) Guidance on ratings to be specified by the manufacturer or to
be agreed upon with the testing house . 29
Bibliography . 30
Figure 1 – Standard test board for fuse-links with wire terminations . 10
Figure 2 – Test board for surface mount fuse-links . 12
Figure 3 – Test fuse base . 13
Figure 4 – Test fuse base for 35A and above . 14
Figure 5 – Test circuits for breaking capacity tests . 17
Table 101 – Cross-sections of conductors . 10
Table 102 – Preferred copper track specifications for test board . 14
Table 103 – Power factor and time constant . 18
Table 104 – Testing schedule for individual current rating for AC or DC breaking
capacity fuse-links . 21
Table 105 – Testing schedule for individual current ratings for AC and DC breaking
capacity fuse-links . 22
Table 106 – Testing schedule for maximum current ratings of a homogeneous series
(AC or DC breaking capacity fuse-links) . 23
Table 107 – Testing schedule for maximum current ratings of a homogeneous series
(AC and DC breaking capacity fuse-links) . 24
Table 108 – Testing schedule for minimum currents rating of a homogeneous series . 25
Table 109 – Testing schedule for all intermediate current ratings of a homogeneous
series. 25
Table AA.1 – Guidance on ratings to be specified by the manufacturer or to be
agreed upon with the testing house . 29
IEC 60127-7:2026 © IEC 2026
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Miniature fuses -
Part 7: Miniature fuse-links for special application
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 60127-7 has been prepared by subcommittee 32C: Miniature fuses, of IEC technical
committee 32: Fuses. It is an International Standard.
This third edition cancels and replaces the second edition published in 2015. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) alignment with IEC 60127-1:2023 (third edition);
b) change of the rated current of miniature fuse-links for special application to 125A and
provision of relevant requirements;
c) addition of a test board for surface mount fuse-links (Figure 2);
d) addition of test schedules for homogenous series.
IEC 60127-7:2026 © IEC 2026
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.
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/679/FDIS 32C/681/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.
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 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.
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 60127-7:2026 © IEC 2026
INTRODUCTION
According to the wish expressed by the users of miniature fuses, all standards,
recommendations and other documents relating to miniature fuses 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 document.
IEC 60127-7:2026 © IEC 2026
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 125 A and a rated breaking capacity not exceeding 50 kA.
NOTE Nominal currents above 20 A are intended for protection of low power electric devices at low voltage and not
for energy distribution.
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 60127-1:2023.
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 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 60127-4:2026, Miniature fuses - Part 4: Universal modular fuse-links (UMF) - Through-hole
and surface mount types
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 60695-2-13:2021, Fire hazard testing - Part 2-13: Glowing/hot-wire based test methods -
Glow-wire ignition temperature (GWIT) test method for materials
IEC 60695-4:2021, Fire hazard testing - Part 4: Terminology concerning fire tests for
electrotechnical products
IEC 60127-7:2026 © IEC 2026
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
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
IEC 60127-7:2026 © IEC 2026
3.6
I (A)
OVL
test current for measuring the maximum sustained power dissipation according to method
A
Note 1 to entry: Preferred values are 1,0 I or 1,25 I or 1,35 I or 1,5 I . 1,0 I is allowable only for nominal
N N N N N
currents above 20 A.
3.7
I (B)
OVL
test current for measuring the maximum sustained power 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 60127-1:2023 applies.
5 Standard ratings
Replace Clause 5 of IEC 60127-1:2023 as follows:
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 (AC and/or DC);
– 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;
and 4 I ).
– time/current characteristic (additionally at 2,75 I
N N
Any additional specified values are given in standard sheet 1. Guidance on ratings to be
specified by the manufacturer or to be agreed upon with the testing house is given in Annex AA.
6 Marking
Clause 6 of IEC 60127-1:2023 applies except as follows.
6.1
Replace a) of Subclause 6.1 as follows:
a) 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).
IEC 60127-7:2026 © IEC 2026
6.2
Deletion of NOTE.
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 60127-1:2023, 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.
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 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 104.
For testing the individual current ratings of fuses with AC and DC 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 105.
For testing the maximum current rating of a homogenous series with AC or DC 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.
IEC 60127-7:2026 © IEC 2026
The testing schedule is shown in Table 106.
For testing the maximum current rating of a homogenous series with AC and DC 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 107.
For testing the minimum current rating of a homogenous series with AC and/or DC breaking
capacity the number of fuse-links required is 38, of which 16 are kept as spares.
The testing schedule is shown in Table 108.
For testing all of the intermediate current rating of a homogenous series with AC and/or DC
breaking capacity the number of fuse-links required is 38, of which 16 are kept as spares.
The testing schedule is shown in Table 109.
7.4 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. Fuse-holder information shall be supplied to users in manufacturer’s literature.
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. The test board
shall be made of epoxide woven glass fabric copper-clad laminated sheet, as defined in
IEC 61249-2-7. The manufacturer must declare the PCB parameters and provide assembled
PCBs for the tests.
This test board shall then be mounted on the test fuse-base (Figure 3 or Figure 4).
When two or more fu
...