SIST EN 60127-3:2015
(Main)Miniature fuses - Part 3: Sub-miniature fuse-links (IEC 60127-3:2015)
Miniature fuses - Part 3: Sub-miniature fuse-links (IEC 60127-3:2015)
This part of IEC 60127 is applicable to sub-miniature fuse-links adapted to printed circuits and
used for the protection of electric appliances, electronic equipment and component parts
thereof, normally intended to be used indoors.
It does not apply to sub-miniature fuse-links for appliances intended to be used under special
conditions, such as in a corrosive or explosive atmosphere.
This standard applies in addition to the requirements of IEC 60127-1.
The object of this standard is to define special and additional test methods for sub-miniature
fuse-links applying in addition to the requirements of IEC 60127-1.
Geräteschutzsicherungen - Teil 3: Kleinstsicherungseinsätze (IEC 60127-3:2015)
Coupe-circuit miniatures - Partie 3: Eléments de remplacement subminiatures (IEC 60127-3:2015)
L'IEC 60127-3:2015 est applicable à tous les éléments de remplacement subminiatures adaptés aux circuits imprimés et utilisés pour la protection d'appareils électriques, de matériels électroniques et de leurs éléments constitutifs, normalement destinés à être utilisés à l'intérieur de bâtiments. Elle n'est pas applicable aux éléments de remplacement subminiatures pour les appareils destinés à être utilisés dans des conditions particulières, telles que les atmosphères corrosives ou explosives. La présente norme s'applique en plus des exigences de l'IEC 60127-1. L'objet de la présente norme est de définir des méthodes d'essai particulières et supplémentaires applicables aux éléments de remplacement subminiatures, celles-ci venant s'ajouter aux exigences de l'IEC 60127-1. Cette troisième édition de l'IEC 60127-3 annule et remplace la première édition parue en 1988, son amendement 1 (1991) et l'amendement 2 (2002). La présente édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- ajout d'une forme rectangulaire de fusible comme solution alternative dans les feuilles de normes 3 et 4;
- ajout d'une petite cartouche comme solution alternative dans les feuilles de normes 2, 3 et 4;
- ajout de courants nominaux jusqu'à 10 A dans les feuilles de normes 2, 3 et 4;
- ajout du paragraphe 6.5;
- ajout du paragraphe 9.7;
- les échantillons supplémentaires pour l'essai de sortie (E1 à E6) seront choisis par hasard et non par ordre de chute de tension dans les Tableaux 1, 2, 3, et 4.
Mots clés: les éléments de remplacement subminiatures adaptés aux circuits imprimés, la protection d'appareils électriques, de matériels électroniques et de leurs éléments constitutifs
Cette publication doit être lue conjointement avec la CEI 60127-1:2006.
Miniaturne varovalke - 3. del: Subminiaturni taljivi vložki (IEC 60127-3:2015)
Ta del standarda IEC 60127 se uporablja za subminiaturne taljive vložke, ki so prilagojeni tiskanim vezjem in se uporabljajo za zaščito električnih naprav in elektronske opreme ter njihovih sestavnih delov, ki so običajno namenjeni za uporabo v zaprtih prostorih. Ne velja za subminiaturne taljive vložke za naprave, namenjene za uporabo pod posebnimi pogoji, na primer v korozivnem ali eksplozivnem ozračju. Ta standard se poleg tega uporablja za zahteve iz standarda IEC 60127-1.
Cilj tega standarda je opredeliti posebne in dodatne preskusne postopke za subminiaturne taljive vložke, ki se uporabljajo skupaj z zahtevami standarda IEC 60127-1.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 60127-3:2015
01-maj-2015
1DGRPHãþD
SIST EN 60127-3:1999/A2:2004
Miniaturne varovalke - 3. del: Subminiaturni taljivi vložki (IEC 60127-3:2015)
Miniature fuses - Part 3: Sub-miniature fuse-links (IEC 60127-3:2015)
Geräteschutzsicherungen - Teil 3: Kleinstsicherungseinsätze (IEC 60127-3:2015)
Coupe-circuit miniatures - Partie 3: Eléments de remplacement subminiatures (IEC
60127-3:2015)
Ta slovenski standard je istoveten z: EN 60127-3:2015
ICS:
29.120.50 9DURYDONHLQGUXJD Fuses and other overcurrent
PHGWRNRYQD]DãþLWD protection devices
SIST EN 60127-3:2015 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 60127-3:2015
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SIST EN 60127-3:2015
EUROPEAN STANDARD EN 60127-3
NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2015
ICS 29.120.50 Supersedes EN 60127-3:1996
English Version
Miniature fuses - Part 3: Sub-miniature fuse-links
(IEC 60127-3:2015)
Coupe-circuit miniatures - Partie 3: Éléments de Geräteschutzsicherungen - Teil 3:
remplacement subminiatures Kleinstsicherungseinsätze
(IEC 60127-3:2015) (IEC 60127-3:2015)
This European Standard was approved by CENELEC on 2015-02-24. 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2015 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 60127-3:2015 E
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SIST EN 60127-3:2015
EN 60127-3:2015 - 2 -
Foreword
The text of document 32C/501/FDIS, future edition 3 of IEC 60127-3, 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 60127-3:2015.
The following dates are fixed:
(dop) 2015-11-24
• latest date by which the document has to be
implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2018-02-24
standards conflicting with the
document have to be withdrawn
This document supersedes EN 60127-3:1996.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such
patent rights.
Endorsement notice
The text of the International Standard IEC 60127-3:2015 was approved by CENELEC as a European
Standard without any modification.
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SIST EN 60127-3:2015
- 3 - EN 60127-3:2015
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
NOTE 1 When 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.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60068-2-21 - Environmental testing -- Part 2-21: Tests - EN 60068-2-21 -
Test U: Robustness of terminations and
integral mounting devices
IEC 60127-1 2006 Miniature fuses -- Part 1: Definitions for EN 60127-1 2006
miniature fuses and general requirements
for miniature fuse-links
IEC 60695-11-5 - Fire hazard testing -- Part 11-5: Test EN 60695-11-5 -
flames - Needle-flame test method -
Apparatus, confirmatory test arrangement
and guidance
IEC 61249-2-7 - Materials for printed boards and other EN 61249-2-7 -
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
+EN 61249-2- 2005
7:2002/corrigendum
Sep. 2005
ISO 3 - Preferred numbers; Series of preferred - -
numbers
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SIST EN 60127-3:2015
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SIST EN 60127-3:2015
IEC 60127-3
®
Edition 3.0 2015-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Miniature fuses –
Part 3: Sub-miniature fuse-links
Coupe-circuit miniatures –
Partie 3: Éléments de remplacement subminiatures
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.120.50 ISBN 978-2-8322-1995-9
Warning! Make sure that you obtained this publication from an authorized distributor.
Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
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SIST EN 60127-3:2015
– 2 – IEC 60127-3:2015 © IEC 2015
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 General requirements . 6
5 Standard ratings . 7
6 Marking . 7
7 General notes on tests . 7
8 Dimensions and construction . 9
9 Electrical requirements . 10
10 Standard sheets . 18
Figure 1 – Standard test board (see 7.3) . 8
Figure 2 – Standard test base for test board (see 7.3) . 9
Figure 3 – Typical circuit for breaking capacity tests for low breaking capacity sub-
miniature fuse-links (see 9.3) . 11
Table 1 – Testing schedule for individual ampere ratings, standard sheet 1 and 2 . 13
Table 2 – Testing schedule for individual ampere ratings, standard sheet 3 and 4 . 14
Table 3 – Testing schedule for maximum ampere rating of a homogeneous series,
standard sheet 1 and 2 . 15
Table 4 – Testing schedule for maximum ampere rating of a homogeneous series,
standard sheet 3 and 4 . 16
Table 5 – Testing schedule for minimum ampere rating of a homogeneous series,
standard sheet 1 to 4 . 17
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SIST EN 60127-3:2015
IEC 60127-3:2015 © IEC 2015 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MINIATURE FUSES –
Part 3: Sub-miniature fuse-links
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60127-3 has been prepared by subcommittee 32C: Miniature fuses,
of IEC technical committee 32: Fuses.
This third edition of IEC 60127-3 cancels and replaces the second edition published in 1988,
its Amendment 1 (1991) and Amendment 2 (2002).
This edition includes the following significant technical changes with respect to the previous
edition:
a) add a rectangular shape fuse-link as alternative in standard sheets 3 and 4;
b) add a small cartridge fuse-link as alternative in standard sheets 2, 3 and 4;
c) add the rated currents up to 10A in standard sheets 2, 3 and 4;
d) add Subclause 6.5;
e) add Subclause 9.7;
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f) the extra samples for termination test (E1 to E6) will be chosen by random and not sorted
by voltage drop in Table 1, 2, 3, and 4.
The text of this standard is based on the following documents:
FDIS Report on voting
32C/501/FDIS 32C/506/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
This International Standard is to be used in conjunction with IEC 60127-1:2006, Miniature
fuses – Part 1: Definitions for miniature fuses and general requirements for miniature fuse-
links and its Amendment 1 (2011).
The clauses of this standard supplement, modify or replace the corresponding clauses in
IEC 60127-1.
Where there is no corresponding clause or subclause in this standard, the clause or
subclause of IEC 60127-1 applies without modification as far as is reasonable. When this
standard states “addition” or “replacement”, the relevant text in IEC 60127-1 is to be adapted
accordingly.
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 publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
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SIST EN 60127-3:2015
IEC 60127-3:2015 © IEC 2015 – 5 –
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, (Free for further documents)
IEC 60127-9, (Free for further documents)
IEC 60127-10, Miniature fuses – Part 10: User guide for miniature fuses
This part of IEC 60127 covers additional requirements, test equipment and standard sheets.
The SI system of units is used throughout this standard.
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MINIATURE FUSES –
Part 3: Sub-miniature fuse-links
1 Scope
This part of IEC 60127 is applicable to sub-miniature fuse-links adapted to printed circuits and
used for the protection of electric appliances, electronic equipment and component parts
thereof, normally intended to be used indoors.
It does not apply to sub-miniature fuse-links for appliances intended to be used under special
conditions, such as in a corrosive or explosive atmosphere.
This standard applies in addition to the requirements of IEC 60127-1.
The object of this standard is to define special and additional test methods for sub-miniature
fuse-links applying in addition to the requirements of IEC 60127-1.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60068-2-21, Environmental testing – Part 2-21: Tests – Test U: Robustness of
terminations and integral mounting devices
IEC 60127-1:2006, Miniature fuses – Part 1: Definitions for miniature fuses and general
requirements for miniature fuse-links
Amendment 1:2011
IEC 60695-11-5, Fire hazard testing – Part 11-5: Test flames – Needle-flame test method –
Apparatus, confirmatory test arrangement and guidance
IEC 61249-2-7, 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, Preferred numbers – Series of preferred numbers
3 Terms and definitions
For the purposes of this document, the terms and definitions in Clause 3 of IEC 60127-1:2006
apply.
4 General requirements
Clause 4 of IEC 60127-1:2006 applies.
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IEC 60127-3:2015 © IEC 2015 – 7 –
5 Standard ratings
Clause 5 of IEC 60127-1:2006 applies.
6 Marking
Clause 6 of IEC 60127-1:2006 applies except as follows:
Addition:
6.4 Sub-miniature fuse-links according to standard sheets 3 and 4 may be provided with
markings for the rated current, the rated voltage and the time/current characteristic on the top
so that they are visible when the fuse-link is mounted.
Additional subclause:
6.5 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
Clause 7 of IEC 60127-1:2006 applies except as follows:
Addition:
7.2.1 For testing individual fuse ratings according to standard sheets 1 and 2, the number of
sub-miniature fuse-links required is 66, of which 12 are kept as spares. The testing schedule
is shown in Table 1.
For testing individual fuse ratings according to standard sheets 3 and 4, the number of fuse-
links required is 51, of which 12 are kept as spares. The testing schedule is shown in Table 2.
For the maximum ampere rating of a homogeneous series, the number of fuse-links required
in the case of fuse-links in accordance with standard sheets 1 and 2 is 56, of which 22 are
kept as spares. The testing schedule is shown in Table 3. The number of fuse-links required
in the case of fuse-links in accordance with standard sheets 3 and 4 is 51, of which 22 are
kept as spares. The testing schedule is shown in Table 4.
For the minimum ampere rating of a homogeneous series the number of fuse-links required is
38, of which 16 are kept as spares. The test schedule is shown in Table 5.
In addition to the test mentioned in 7.2.1 of IEC 60127-1:2006, sub-miniature fuse-links shall
be taken and shall be tested or inspected in accordance with the following item e):
e) Sub-miniature fuse-link terminations (8.3)
Replacement:
7.3 Fuse-bases for testing
Fuse-links shall be mounted upon the appropriate test board (see Figure 1) by soldering.
This test board shall then be mounted on the test fuse-base (Figure 2). The test board shall
be made of epoxide woven glass fabric copper-clad laminated sheet, as defined in
IEC 61249-2-7.
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The nominal sheet thickness shall be 1,6 mm.
The nominal thickness of the cooper layer shall be 0,035 mm (0,070 mm above 5 A).
Metal parts of the fuse-base shall be made of brass with copper content between 58 % and
70 %. Contact parts shall be silver-plated.
When two or more sub-miniature fuse-links are tested in series, the fuse-bases shall be
located so that there will be a spacing of not less than 50 mm between any two sub-miniature
fuse-links under test. The conductor connecting the fuse-bases together and connecting the
fuse-bases to the ammeter and the source of supply shall be insulated copper wire. The
length of each conductor shall be 250 mm and the cross-sectional area of the wire shall be
2
approximately 1 mm .
NOTE Minimum land spacing is under consideration
(applicable when n is less than 2). In this case the diameter
of the terminal hole has to be reduced from 1,5 mm to 1,0 mm.
IEC
Dimensions in millimetres
Key
O copper layer, thickness 0,035 mm (0,070 mm for rated currents above 5 A)
U connection for voltage drop measurement
e 2,54 mm
n 1,2,3 … (to be adapted depending on the length of the fuse-link)
n 1 for fuse-links up to and including 5 A
1
2 for fuse-links above 5 A
Figure 1 – Standard test board (see 7.3)
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SIST EN 60127-3:2015
IEC 60127-3:2015 © IEC 2015 – 9 –
IEC
Dimensions in millimetres
Key
A base of low heat conducting material, thickness 10 mm
B brass electrodes 10 mm square
C sub-miniature fuse-link soldered in place
D fixing screws
E contact screws holding solder terminal
F printed circuit board (see Figure 1)
G space between sub-miniature fuse-link enclosure and board equals
(0,5 ± 0,25) mm or for tubular fuse-link 1 mm
H top view of base with 10 mm square brass electrodes
Figure 2 – Standard test base for test board (see 7.3)
8 Dimensions and construction
Clause 8 of IEC 60127-1:2006 applies except as follows.
8.2 Construction
Addition:
The sub-miniature fuse-link shall be resistant to heat according to 9.7 of IEC 60127-1:2006
and to fire in accordance with IEC 60695-11-5 (needle-flame test).
The duration of the application of the test flame is 10 s.
Not required for glass or ceramic.
Compliance is checked by inspection.
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This standard is based on the assumption that the case of the sub-miniature fuse-link is made
of glass, ceramic or similar non-combustible material. For other material, such as the optional
insulating sleeve or epoxy coating or similar material shown on standard sheet 2, 3 or 4
additional tests are under consideration.
Addition:
8.3 Sub-miniature fuse-link terminations
The sub-miniature fuse-link terminations should be firmly attached so that it is not possible to
remove them without damaging the sub-miniature fuse-link.
The samples are pre-conditioned by immersion in water for 24 h at a temperature between
15 °C and 35 °C.
Terminations shall withstand the mechanical forces likely to be encountered during normal
use. With the sub-miniature fuse-link held in a fixed position, each terminal in turn is
subjected at ambient temperature to the forces laid down in this standard. These forces shall
be exerted in the direction of the axis of the terminal and applied progressively without jerks.
Test sample groups shall be equally divided among the specific termination tests stipulated in
the relevant standard sheets.
Present test methods are to be performed in accordance with IEC 60068-2-21.
– For the tensile test (Ua ), the force applied shall be 10 N.
1
– For the thrust test (Ua ), the force applied shall be 2 N.
2
– For the bending test (Ub), if applicable, the force applied shall be 5 N and the number of
bends shall be one.
At the conclusion of testing, the sub-miniature fuse-link terminations shall remain firmly
attached and the voltage drop shall not exceed the maximum allowed in the relevant standard
sheet.
8.4 Alignment and configuration of terminations
Replacement:
The sub-miniature fuse-link terminations shall be designed to permit easy installation on
printed circuit wiring boards having a grid system of holes located on 2,54 mm centres, or into
fuse-bases having a spacing between the terminations which is compatible with the 2,54 mm
grid system.
NOTE Attention is drawn to the fact that in some parts of the world the value e = 2,54 mm is still in use by printed
circuit designers. (See IEC 60127-4:2012, 8.4, NOTE 1.)
9 Electrical requirements
Clause 9 of IEC 60127-1:2006 applies except as follows.
9.1 Voltage drop
Addition:
The use of a high impedance voltmeter is recommended for measuring the voltage drop.
Voltage drop shall be measured at the points marked with U in Figure 1.
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IEC 60127-3:2015 © IEC 2015 – 11 –
9.3 Breaking capacity
9.3.1 Operating conditions
Addition:
Typical test circuits for a.c. and d.c. are given in Figure 3.
When alternating current is stipulated by the relevant standard sheets, the circuit power factor
shall be larger than 0,95. To obtain this result, the circuit shall be adjusted by the use of
resistors with negligible inductance.
S A C
R
F
D
S A C
R
F
D
IEC
Key
A = removable link used for calibration
C = contactor that makes the circuit
D = switch to disconnect the source of supply
F = fuse-link under test
S – source of supply, impedance less than 10 % of total impedance of the circuit
R = series resistor, adjusted to obtain correct prospective current
Figure 3 – Typical circuit for breaking capacity tests for
low breaking capacity sub-miniature fuse-links (see 9.3)
9.3.2 Criteria for satisfactory performance
Addition:
In addition to the criteria of failure prescribed in IEC 60127-1, in each of the tests, the
subminiature fuse-link shall operate satisfactorily without any of the following phenomena:
– fusing together of the contacts or terminations;
– illegibility of marking after test;
– piercing of the external surfaces visible to the naked eye.
The following phenomena are neglected:
– black spots on the sub-miniature fuse-link terminations;
– small deformations of the sub-miniature fuse-link terminations;
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– cracking of the sub-miniature fuse-link.
9.4 Endurance tests
Addition:
9.4.1 Endurance test at normal ambient temperature
Compliance is checked by subjecting the sub-miniature fuse-links to test method A or B as
required in the relevant standard sheets.
9.4.2 Test method A
As specified in IEC 60127-1:2006, 9.4 a) to d).
9.4.3 Test method B
a) A direct current as specified in the relevant standard sheets is passed through the sub-
miniature fuse-link for a period of 100 h. The current stability during the test shall be
maintained within ±1% of the adjustable value.
A current of 1 I is then passed through the sub-miniature fuse-link for 1 h.
N
b) The voltage drop across the sub-miniature fuse-link at the end of this test is measured and
used for the calculation of the maximum sustained power dissipation.
c) The voltage drop measured in item b) of 9.4.3 shall not have increased by more than 10 %
of the value measured before the test and shall not exceed the maximum allowed value in
the relevant standard sheet.
d) After the test, the marking shall still be legible and soldered joints on end caps etc. shall
not show any appreciable deterioration.
NOTE Changes in colour are not considered as a failure.
9.7 Fuse-link temperature
Addition:
Fuse-links shall be tested according to 9.7 of IEC 60127-1:2006 with the following
modifications:
Replacement of second paragraph of 9.7 by the following:
The temperature rise shall not exceed 150 K when measured on the terminations where they
enter the test board, and 135 K when measured on the plastic fuse body (not necessary for
glass or ceramic materials), the fuse-link being tested as follows:
Replacement of text of the last dash by:
– the temperature during the last 30 seconds prior to opening shall be ignored;
Add an additional dash and text as follows:
2
– the thermocouple size shall be no larger than 0,05 mm (30 AWG).
Deletion of NOTE 1 and change NOTE 2 to NOTE.
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