IEC 60127-7:2013

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

IEC 60127-7:2013 covers requirements for miniature fuse-links for special applications. 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 standard applies in addition to the requirements of IEC 60127-1. This standard is applicable to fuse-links with a rated voltage not exceeding 1000 V, a rated current not exceeding 20 A and a rated breaking capacity not exceeding 50 kA. 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 standard 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. Keywords: requirements for miniature fuse-links
This publication is to be read in conjunction with IEC 60127-1:2006.

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

La CEI 60127-7:2013 couvre des exigences pour éléments de remplacement miniatures destinés à des applications spéciales. Elle ne s'applique pas aux coupe-circuits complètement couverts par les autres parties de la CEI 60269-1. Elle n'est pas applicable aux éléments de remplacement miniatures placés dans des appareils destinés à être employés dans des conditions particulières, telles qu'atmosphères corrosives ou explosives. La présente norme s'applique en complément des exigences présentées dans la CEI 60127-1. La présente norme est applicable aux éléments de remplacement de tension assignée ne dépassant pas 1 000 V, de courant assigné ne dépassant pas 20 A et de pouvoir de coupure assigné ne dépassant pas 50 kA. Les éléments de remplacement miniatures pour applications spéciales ne sont pas destinés à être remplacés par l'utilisateur final d'un appareil électronique ou électrique. La présente norme a pour objet d'établir des méthodes d'essai uniformes pour des éléments de remplacement miniatures pour applications spéciales, pour permettre de vérifier les valeurs (par exemple la durée de fusion et le pouvoir de coupure) spécifiées par le fabricant. Mots clés: exigences pour éléments de remplacement miniatures
Cette publication doit être lue conjointement avec la CEI 60127-1:2006.

General Information

• Status: Published
• Publication Date: 19-Mar-2013
• ICS: 29.120.50 - Fuses and other overcurrent protection devices
• Technical Committee: SC 32C - Miniature fuses
• Drafting Committee: WG 12 - TC 32/SC 32C/WG 12
• Current Stage: DELPUB - Deleted Publication
• Completion Date: 22-Sep-2015

Relations

• Revised: IEC 60127-7:2015 - Miniature fuses - Part 7: Miniature fuse-links for special applications
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 60127-7
®

Edition 1.0 2013-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE


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

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

IEC 60127-7:2013

---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 60127-7

®


Edition 1.0 2013-03




INTERNATIONAL



STANDARD




NORME



INTERNATIONALE











Miniature fuses –

Part 7: Miniature fuse-links for special applications




Coupe-circuits miniatures –

Partie 7: Eléments de remplacement miniatures pour applications spéciales















INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE

PRICE CODE
INTERNATIONALE

CODE PRIX S


ICS 29.120.50 ISBN 978-2-83220-670-6



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

---------------------- Page: 3 ----------------------
– 2 – 60127-7  IEC:2013
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 General requirements . 7
5 Standard ratings . 8
6 Marking . 8
7 General notes on tests . 9
8 Dimensions and construction . 12
9 Electrical requirements . 13
9.1 Voltage drop . 13
9.2 Time/current characteristic . 13
9.2.1 Time/current characteristic at normal ambient temperature . 13
9.2.2 Test at elevated temperature . 13
9.3 Breaking capacity . 13
9.3.1 Operating conditions . 13
9.3.2 Criteria for satisfactory performance . 15
9.4 Endurance tests . 15
9.4.101 Endurance test at normal ambient temperature . 16
9.4.102 Test method A . 16
9.4.103 Test method B . 16
9.5 Maximum sustained dissipation . 16
9.6 Pulse tests . 16
9.7 Fuse-link temperature . 16
9.7.101 Fuse-links for use on printed circuit boards . 16
9.7.102 Fuse-links for use in fuse-holders . 17
Annex AA (informative) Guidance on ratings to be specified by the manufacturer or to
be agreed upon with the testing house . 23

Figure 1 – Standard test board . 10
Figure 2 – Standard test base for printed circuit board . 11
Figure 3 – Test circuits for breaking capacity tests . 14

Table 1 – Power factor and time constant . 15
Table 2 – Testing schedule for a.c. or d.c. breaking capacity fuse-links . 18
Table 3 – Testing schedule for a.c. and d.c. breaking capacity fuse-links . 19

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60127-7  IEC:2013 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

MINIATURE FUSES –

Part 7: Miniature fuse-links for special applications


FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60127-7 has been prepared by subcommittee 32C: Miniature fuses,
of IEC technical committee 32: Fuses.
The text of this standard is based on the following documents:
CDV Report on voting
32C/458/CDV 32C/467/RVC

Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
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).

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– 4 – 60127-7  IEC:2013
The clauses of this standard supplement, modify or replace the corresponding clauses in
IEC 60127-1.
Where there is no corresponding clause or subclause in this standard, the clause or
subclause of IEC 60127-1 applies without modification as far as is reasonable. When this
standard states “addition” or “replacement”, the relevant text in IEC 60127-1 is to be adapted
accordingly.
Subclauses which are additional to those in Part 1 are numbered starting from 101. Additional
annexes are numbered AA, BB, etc.
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.

---------------------- Page: 6 ----------------------
60127-7  IEC:2013 – 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 containing general requirements need not
be repeated.
The IEC 60127 series, under the general heading Miniature fuses, is thus subdivided as
follows:
IEC 60127-1, Miniature fuses – Part 1: Definitions for miniature fuses and general
requirements for miniature fuse-links
IEC 60127-2, Miniature fuses – Part 2: Cartridge fuse-links
IEC 60127-3, Miniature fuses – Part 3: Sub-miniature fuse-links
IEC 60127-4, Miniature fuses – Part 4: Universal modular fuse-links (UMF) – Through-hole
and surface mount types
IEC 60127-5, Miniature fuses – Part 5: Guidelines for quality assessment of miniature fuse-
links
IEC 60127-6, Miniature fuses – Part 6: Fuse-holders for miniature fuse-links
IEC 60127-7, Miniature fuses – Part 7: Miniature fuse-links for special applications
IEC 60127-8, (Free for further documents)
IEC 60127-9, (Free for further documents)
IEC 60127-10, Miniature fuses – Part 10: User guide for miniature fuses

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– 6 – 60127-7  IEC:2013
MINIATURE FUSES –

Part 7: Miniature fuse-links for special applications



1 Scope
This part of IEC 60127 covers requirements for miniature fuse-links for special applications.
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 standard applies in addition to the requirements of IEC 60127-1.
This standard is applicable to fuse-links with a rated voltage not exceeding 1000 V, a rated
current not exceeding 20 A and a rated breaking capacity not exceeding 50 kA.
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 standard is to establish uniform test methods for miniature fuse-links for
special applications, so as to allow verification of the values (for example melting time and
breaking capacity values) specified by the manufacturer.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60068-2-21:2006, Environmental testing – Part 2-21: Tests – Test U: Robustness of
terminations and integral mounting devices
IEC 60127-1:2006, Miniature fuses – Part 1: Definitions for miniature fuses and general
requirements for miniature fuse-links
IEC 60127-6:1994, Miniature fuses – Part 6: Fuse-holders for miniature cartridge fuse-links
Amendment 1:1996
Amendment 2:2002
IEC 60664-1:2007, Insulation coordination for equipment within low-voltage systems – Part 1:
Principles, requirements and tests
IEC 60695-2-12:2010, Fire hazard testing – Part 2-12: Glowing/hot-wire based test methods –
Glow-wire flammability index (GWFI) test method for materials
IEC 60695-2-13:2010, Fire hazard testing – Part 2-13: Glowing/hot-wire based test methods –
Glow-wire ignition temperature (GWIT) test method for materials
IEC 60695-4:2012, Fire hazard testing – Part 4: Terminology concerning fire tests for
electrotechnical products

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60127-7  IEC:2013 – 7 –
IEC 61249-2-7:2002, Materials for printed boards and other interconnecting structures –
Part 2-7: Reinforced base materials clad and unclad – Epoxide woven E-glass laminated
sheet of defined flammability (vertical burning test), copper-clad
ISO 3:1973, Preferred numbers – Series of preferred numbers
3 Terms and definitions
For the purposes of this document, the terms and definitions given in Clause 3 of IEC 60127-
1:2006, except 3.5, as well as the following apply.
3.1
miniature fuse-link for special applications
enclosed fuse-link which is not covered in IEC 60127-2, IEC 60127-3 or IEC 60127-4 and of
rated breaking capacity not exceeding 50 kA, with a width and height not exceeding 12 mm
and a length not exceeding 50 mm
Note 1 to entry: Special precautions may be necessary to ensure that the fuse-links will be replaced by a fuse-link
with the same technical parameters.
3.2
t to t
1 8
limit values for time/current characteristic
3.3
I
70
test current for testing at elevated temperature of 70 °C
Note 1 to entry: Preferred values are 0,8 I or 1,0 I or 1,1 I .
N N N
3.4
I (A)
test
test current for endurance testing according to method A
Note 1 to entry: Preferred values are 1,0 I or 1,05 I or 1,2 I .
N N N
3.5
I (B)
test
test current for endurance testing according to method B
Note 1 to entry: Preferred values are 0,8 I or 1,0 I .
N N
3.6
I (A)
OVL
test current for measuring the maximum sustained dissipation according to method A
Note 1 to entry: Preferred values are 1,25 I or 1,35 I or 1,5 I .
N N N
3.7
I (B)
OVL
test current for measuring the maximum sustained dissipation according to method B
Note 1 to entry: Preferred values are 1,0 I or 1,25 I .
N N
4 General requirements
Clause 4 of IEC 60127-1:2006 applies.

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– 8 – 60127-7  IEC:2013
5 Standard ratings
Clause 5 of IEC 60127-1:2006 does not apply.
Replacement:
The following ratings shall be agreed upon between the testing house and the manufacturer:
– rated voltage;
– rated current (see standard sheet 1 for preferred ratings);
– rated breaking capacity (a.c. and/or d.c.);
– time/current characteristic (at least at 2,0 I or 2,1 I and 10 I ).
N N N
The following may be agreed upon on an optional basis:
– test at elevated temperature;
– time/current characteristic (additionally at 2,75 I and 4 I ).
N N
Any additional specified values are given in standard sheet 1.
6 Marking
Clause 6 of IEC 60127-1:2006 applies except as follows.
6.1
Replacement:
d) Not applicable.
NOTE A symbol denoting the time/current characteristic cannot be stated, because this part of IEC 60127 does
not specify any values for this parameter.
Addition:
e) Type designation.
f) Rated breaking capacity in amperes (A) or in kilo amperes (kA).
6.2
Deletion of NOTE 2.
6.3
Addition after first paragraph:
Furthermore the rated breaking capacity in amperes (A) or in kilo amperes (kA) shall be
marked on the package label.
6.4
Addition of heading title and replacement of text:
6.4 Colour coding for miniature fuse-links for special applications
Marking of fuse-links by means of colour bands according to IEC 60127-1:2006, Annex A, is
not permitted. It is, however, possible to use colour markings that clearly differ from this
colour band system. In this case, the manufacturer shall provide the relevant information, for
example colour key.

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60127-7  IEC:2013 – 9 –
Additional subclause:
6.101 Where marking is impracticable due to space limitations, the relevant information
should appear on the smallest package and in the manufacturer’s technical literature.
7 General notes on tests
Clause 7 of IEC 60127-1:2006 applies except as follows.
7.2 Type tests
7.2.1
Replacement:
For testing the individual current ratings of fuses with a.c. or d.c. breaking capacity, the
number of fuse-links required is 51, of which 12 are kept as spares.
The testing schedule is shown in Table 2.
For testing the individual current ratings of fuses with a.c. and d.c. breaking capacity, the
number of fuse-links required is 63, of which 9 are kept as spares.
The testing schedule is shown in Table 3.
7.3 Fuse-bases for tests
Addition:
For fuse-links designed for use in a special type of fuse-holder, testing shall be performed in
that fuse-holder.
For tests that require a printed circuit board for mounting and connection of the fuse-links, a
test board according to Figure 1 shall be used.
NOTE Fuse-bases for surface-mounted fuse-links are under consideration.

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– 10 – 60127-7  IEC:2013
Dimensions in millimetres
∅4,2
O U
U
20
n × e
1
n × e
5
90
100
Figure 1A
∅1,0
n × e
1
Radius =
2
IEC  492/13

Key
O copper layer
U connection for voltage drop measurement
e 2,5 mm
n 1, 2, 3, 4
1
n 1, 2, 3 … (to be adapted depending on the length of the fuse-link)
Figure 1 – Standard test board
This test board shall be mounted on the fuse-base according to Figure 2.

10
16,5
3
33

---------------------- Page: 12 ----------------------
60127-7  IEC:2013 – 11 –
Dimensions in millimetres

D
F C
E
B A
G
90
IEC  493/13

Key
A base of low heat conducting material, thickness 10 mm
B brass electrodes 10 mm × 10 mm
C fuse-link soldered in place
D fixing screws
E contact screws holding solder terminal
F printed circuit board according to Figure 1
G top view of base with brass electrodes 10 mm × 10 mm
Figure 2 – Standard test base for printed circuit board
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 may be 0,035 mm or 0,070 mm.
The nominal width of copper layer may be 2,5 mm, 5 mm, 7,5 mm or 10 mm.
The nominal thickness and nominal width of applied copper layer shall be stated in the test
report.
Metal parts of the fuse-base shall be made of brass with a copper content between 58 % and
70 %. Contact parts shall be silver-plated.
7.4 Nature of supply
Addition:
Schedule for testing fuse-links with a.c. or d.c. breaking capacity according to Standard
Sheet 1, see Table 2.
5
5
30
40

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– 12 – 60127-7  IEC:2013
Schedule for testing fuse-links with a.c. and d.c. breaking capacity according to Standard
Sheet 1, see Table 3.
8 Dimensions and construction
Clause 8 of IEC 60127-1:2006 applies except as follows.
8.2 Construction
Replacement:
The fuse-element shall be completely enclosed.
The fuse-links shall be resistant to heat according to 9.7, and to fire according to
IEC 60695-2-12 and IEC 60695-2-13.
Compliance is checked by inspection. This is not applicable for fuse-links which represent
small parts according to IEC 60695-4:2012, 3.78.
For fuse bodies made of plastic material or of material containing organic substances the
following minimum requirements apply:
– Glow-wire ignition temperature (GWIT) = 775 °C
– Glow-wire flammability index (GWFI) = 850 °C
NOTE 1 For the glow wire tests it is necessary to use material plates with dimensions according to IEC 60695-2-
12:2010, 4.2 and/or IEC 60695-2-13:2010,, 4.2.
NOTE 2 For materials such as glass and ceramic whose GWIT and GWFI are thought to be higher than 775 °C
and respectively 850 °C the glow-wire tests do not apply.
8.3 Fuse-link terminations
Replacement:
Subclause 8.3 applies only to fuse-links with wire terminations.
Fuse-link contacts shall be made of non-corroding material or of material suitably protected
against corrosion, and shall be effectively free from flux or other non-conducting substance on
their outer surfaces.
Nickel or silver plating is deemed to be adequate protection for brass end caps.
The fuse-link terminations shall be reliably attached.
The samples shall be immersed in water for 24 h at a temperature of between 15 °C and
35 °C.
Terminations shall withstand the mechanical forces likely to be encountered during normal
use. With the fuse-link held in a fixed position, each terminal in turn is subjected at ambient
temperature to the forces laid down in this standard. The test samples shall be equally divided
among the specific termination tests.
Present test methods 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

---------------------- Page: 14 ----------------------
60127-7  IEC:2013 – 13 –
– For the bending test (Ub), if applicable, the force applied shall be 5 N and the number of
bends shall be one.
After the conclusion of testing, the fuse-link terminations shall remain firmly attached and the
voltage drop shall not exceed the maximum allowed value in standard sheet 1.
9 Electrical requirements
Clause 9 of IEC 60127-1:2006 applies except as follows.
9.1 Voltage drop
Addition:
The use of a high impedance voltmeter is recommended for measuring the voltage drop. The
voltage drop shall be measured directly at the fuse-link terminations or, where this is not
possible, in the immediate vicinity of the fuse body.
If the test board according to Figure 1 is used, the voltage drop may be measured at the
points marked with U.
9.2 Time/current characteristic
9.2.1 Time/current characteristic at normal ambient temperature
Addition:
Limit values t to t given in standard sheet 1 shall be defined by the manufacturer.
8
1
Limit values t (maximum value at 2,1 I or 2,0 I ) and t (maximum value at 10 I ) are
2 N N 8 N
required to be specified. Limit values t , t , t , t , t and t are optional.
1 3 4 5 6 7
The value t shall be not more than 1 h.
2
The value t shall be not more than 1 s.
8
9.2.2 Test at elevated temperature
Replacement:
If declared by the manufacturer, this test shall be carried out according to IEC 60127-1:2006,
9.2.2, using the test current (I ) specified by the manufacturer.
70
9.3 Breaking capacity
9.3.1 Operating conditions
Method A of IEC 60127-1:2006, 9.3.1, applies.
Addition:
In the case of fuse-links in which any component is organic (such as with a moulded body),
the recovery voltage shall be maintained for 5 min after the fuse has operated.
Typical test circuits for a.c. and d.c. are given in Figure 3.

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– 14 – 60127-7  IEC:2013

Figure 3a – Typical test circuit for breaking capacity tests for fuse-links
with breaking capacity greater than 100 A


Figure 3b – Typical test circuit for breaking capacity tests for fuse-links
with breaking capacity less or equal than 100 A
Components
A removable link used for calibration S source of supply, impedance less than 10 % of the
total impedance of the circui
...