IEC 60127-7:2013

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

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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

– 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

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).

– 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.
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

– 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
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
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.

– 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.
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.

– 10 – 60127-7  IEC:2013
Dimensions in millimetres
∅4,2
O U
U
n × e
n × e
Figure 1A
∅1,0
n × e
Radius =
IEC  492/13
Key
O copper layer
U connection for voltage drop measurement
e 2,5 mm
n 1, 2, 3, 4
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.

16,5
60127-7  IEC:2013 – 11 –
Dimensions in millimetres
D
F C
E
B A
G
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.
– 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.
– For the thrust test (Ua ), the force applied shall be 2 N.
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.
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.
The value t shall be not more than 1 s.
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.
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.

– 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 circuit
C contactor that makes the circuit
L air-cored inductance
D switch to disconnect the source of supply
R series resistor, adjusted to obtain correct
F fuse-link under test
prospective current
Figure 3 – Test circuits for breaking capacity tests

60127-7  IEC:2013 – 15 –
In principle, the rated breaking capacity (a.c. and/or d.c.) and associated power factor or time
constant, respectively, shall be specified by the manufacturer. The values given in the table
below are reference values only.
The specified rated breaking capacity shall not be less than 35 A or 10 times the rated current,
whichever is greater.
Unless otherwise stated by the manufacturer, the power factor and time constant of the test
circuit shall be chosen from Table 1.
Table 1 – Power factor and time constant
Test current Power factor Time constant
up to 100 A
>0,95 <1 ms
above 100 A up to 500 A 0,8 to 0,9 1 ms to 1,7 ms
above 500 A up to 1 500 A 0,7 to 0,8 2 ms to 2,5 ms
above 1 500 A up to 10 000 A 0,5 to 0,6 4,5 ms to 5 ms
above 10 000 A up to 25 000 A 0,3 to 0,4 9 ms to 10 ms
above 25 000 A up to 50 000 A 0,2 to 0,3 12,5 ms to 15 ms

For tests at lower prospective currents (5 I , 10 I , 50 I , 250 I ), the inductance of the circuit
N N N N
shall remain constant and the current shall be adjusted by changing the resistance only.
9.3.2 Criteria for satisfactory performance
Addition:
In addition to the failure criteria described in IEC 60127-1, the fuse-link shall operate
satisfactorily in all tests without any of the following phenomena:
– fusing together of the contacts;
– illegibility of marking after test;
– piercing of end caps (if applicable), visible to the naked eye;
– piercing of the external surfaces, visible to the naked eye;
– scorching or melting of organic substances on the external surfaces.
The following phenomena are neglected:
– black spots or other marks on the fuse-link terminations;
– small deformations of the fuse-link;
– cracking of the fuse-link, unless it causes the fuse-link to fall apart during replacement.
9.4 Endurance tests
a) Replacement of the first sentence as follows:
The test current I (A) is passed through the fuse-link for a period of 1 h. The minimum
test
value for I (A) is 1,0 I .
test N
b) Replacement of the first sentence as follows:
The test current I (A) is then passed through the fuse-link for a period of 1 h.
OVL
c) Addition:
The voltage drop shall not exceed the maximum value specified in standard sheet 1.

– 16 – 60127-7  IEC:2013
Additional subclauses:
9.4.101 Endurance test at normal ambient temperature
Compliance is checked by subjecting the fuse-links to test method A or test method B.
Choice of either method A or method B shall be as agreed upon with the manufacturer. This
also applies to the test currents to be selected among I (A), I (B), I (A) and I (B).
test test OVL OVL
9.4.102 Test method A
As specified in IEC 60127-1:2006, 9.4 a) to d), with test current I (A) for 9.4 a) and I (A)
test OVL
for 9.4 b).
9.4.103 Test method B
The test sequence has to be as follows:
a) The d.c. current I (B) is passed through the fuse-link for a period of 100 h. The
test
minimum value for I (B) is 0,8 I .
test N
The current stability during the test shall be maintained within ±1 % of the adjusted value.
The d.c. current I (B) is then passed through the fuse-link for a period of 1 h.
OVL
b) At the end of this test the voltage drop across the fuse-link is measured and used for the
calculation of the maximum sustained dissipation.
c) Finally, the voltage drop across the fuse-link is measured again according to 9.1. The
voltage drop shall not have increased by more than 10 % of the value measured before
the test and shall not exceed the maximum value specified in standard sheet 1.
d) After the test, the marking shall still be legible and soldered joints on the fuse-link
terminations shall not show any appreciable changes.
NOTE Changes in colour are not considered a failure.
9.5 Maximum sustained dissipation
Subclause 9.5 of IEC 60127-1:2006 applies.
9.6 Pulse tests
Replacement:
None specified.
9.7 Fuse-link temperature
Additional subclauses:
9.7.101 Fuse-links for use on printed circuit boards
For fuse-links designed to be mounted on circuit boards, compliance is checked by subjecting
the fuse-links to test method I or method II as requested by the manufacturer.
Test method I
As specified in IEC 60127-1:2006, 9.7, with replacement of the maximum temperature rise of
135 K by 150 K for terminals and 135 K for plastic body materials. The initial current shall be
I (A) or I (B) depending on which test method of 9.4 has been chosen.
OVL OVL
The temperature during the last 30 s prior to opening shall be ignored.

60127-7  IEC:2013 – 17 –
Test method II
The temperature rise above ambient temperature shall be measured on the terminals of the
fuse-links soldered to the relevant test board, using a fine-wire thermocouple not larger than
0,21 mm .
The measurement shall be done during the final 5 min of the endurance test at I (A) or
OVL
I (B) depending on which test method of 9.4 has been chosen. The temperature rise shall
OVL
not exceed 95 K.
Fuse-link numbers 1, 2, 3, 4, 5 and 6 shall be used for this test and fuse-link numbers 43, 44
and 45 in Table 2, or 58, 59 and 60 in Table 3, shall be kept as additional spares.
9.7.102 Fuse-links for use in fuse-holders
For fuse-links intended to be inserted in specifically designed fuse-holders, the test according
to IEC 60127-6:1994, Clause 14, shall be carried out using the fuse-links to be tested instead
of the required dummy fuse-links.
After the test in 14.1 of IEC 60127-6:1994, the inspection according to IEC 60127-6:1994,
12.2, shall not be performed.
– 18 –            60127-7  CEI:2013

Table 2 – Testing schedule for a.c. or d.c. breaking capacity fuse-links
Fuse-link number
1 4 7 10 13 16 19 22 25 28 31 34 37 40 43 46 49
Subclause Description
2 5 8 11 14 17 20 23 26 29 32 35 38 41 44 47 50
3 6 9 12 15 18 21 24 27 30 33 36 39 42 45 48 51
9.7 Fuse-link temperature        X
9.4 Endurance tests X X
9.2.2 Test at elevated temperature  X
9.2.1 Time/current characteristic 10 I     X
N
at normal ambient temperature
4,0 I     X
N
2,75 I       X
N
2,0 I or 2,1 I         X
N N
9.3 Breaking capacity
Rated breaking capacity   X
5 times the rated current 5 I    X
N
10 times the rated current 10 I      X
N
a
50 times the rated current 50 I      X
N
a
250 times the rated current 250 I       X
N
9.3.3 Insulation resistance   X X  X X X
8.3 Fuse-link terminations X X
8.5 Soldered joints X X   X X   X X X
6.2 Legibility and indelibility of marking    X X   X X X
a
Applicable only when the rated breaking capacity is not exceeded.

60127-7  IEC:2013                – 19 –

Table 3 – Testing schedule for a.c. and d.c. breaking capacity fuse-links
Fuse-link number
1 4 7 10 13 16 19 22 25 28 31 34 37 40 43 46 49 52 55 58 61
Subclause Description
2 5 8 11 14 17 20 23 26 29 32 35 38 41 44 47 50 53 56 59 62
3 6 9 12 15 18 21 24 27 30 33 36 39 42 45 48 51 54 57 60 63
9.7 Fuse-link temperature          X
9.4 Endurance tests X X
9.2.2 Test at elevated temperature  X
9.2.1 Time/current characteristic 10 I      X
N
at normal ambient temperature
4,0 I      X
N
2,75 I          X
N
2,0 I or 2,1 I           X
N N
9.3 Breaking capacity
Rated breaking capacity a.c.   X
Rated breaking capacity d.c.   X
5 times the rated current 5 I – a.c.    X
N
5 times the rated current 5 I – d.c.    X
N
10 times the rated current 10 I – a.c.      X
N
10 times the rated current 10 I – d.c.       X
N
a
50 times the rated current 50 I – a.c.       X
N
a
50 times the rated current 50 I – d.c.        X
N
a
250 times the rated current 250 I – a.c.         X
N
a
250 times the rated current 250 I – d.c.         X
N
9.3.3 Insulation resistance   X X X X  X X X X X X
8.3 Fuse-link terminations X X
8.5 Soldered joints X X    X X    X X X
6.2 Legibility and indelibility of marking     X X    X X X
a
Applicable only when the rated breaking capacity is not exceeded.

– 20 – 60127-7  CEI:2013
Standard
sheet
Fuse-links for special applications
Page 1
a
Minimum Maximum dimensions
Rated voltage
terminal spacing mm
P W H L
V mm (width) (height) (length)
12,5 0,4 12 12 50
25 0,45 12 12 50
32 0,48 12 12 50
50 0,53 12 12 50
63 1,1 12 12 50
125 1,3 12 12 50
250 2,5 12 12 50
500 to be determined 12 12 50
1 000 to be determined 12 12 50
a
Intermediate values are possible. The respective minimum terminal spacing P
shall be chosen according to IEC 60664-1.
Any shape is allowed; the point at which the terminations protrude from the body is optional and
the termination may vary.
Some alternative shapes are shown below:

Remark: The terminal spacing P has been chosen according to IEC 60664-1 taking into account pollution
degree 2 and overvoltage category II (stress less than 1 500 h).

60127-7  CEI:2013 – 21 –
Standard
sheet
Fuse-links for special applications
Page 2
Maximum values of voltage drop and sustained dissipation
Rated current Maximum voltage drop Maximum sustained
dissipation
mV mW
32 mA 7 000 1 600
50 mA 5 000 1 600
63 mA 4 400 1 600
80 mA 3 800 1 600
100 mA 3 500 1 600
125 mA 2 500 1 600
160 mA 2 200 1 600
200 mA 1 800 1 600
250 mA 1 400 1 600
315 mA 1 300 1 600
400 mA 1 000 1 600
500 mA 900 1 600
630 mA 800 1 600
800 mA 600 1 600
1,0 A 500 2 500
1,25 A 400 2 500
1,6 A 300 2 500
2,0 A 300 2 500
2,5 A 300 2 500
3,15 A 300 4 000
4,0 A 300 4 000
5,0 A 300 4 000
6,3 A 300 4 000
8,0 A 220 4 000
10,0 A 220 4 000
12,5 A 180 4 000
16 A 140 4 000
20 A 100 4 000
If intermediate rated currents are required, they shall be chosen from the series R20 or R40
according to ISO 3.
If lower values are stated by the manufacturer, these values shall be used.
Marking
Fuse-links shall be marked according to the requirements of Clause 6.
Pre-arcing time/current characteristic
The pre-arcing time shall be within the following limits:
2,0 I or 2,1 I 2,75 I 4 I 10 I

N N N N N
min. max. min. max. min. max. min. max.
t t t t t t t t
1 2 3 4 5 6 7 8
– 22 – 60127-7  CEI:2013
Standard
sheet
Fuse-links for special applications
Page 3
Test at a temperature of (70 ± 2)°C (if requested by the manufacturer)
A test current I shall be passed through the fuse-links for 1 hour and they shall not operate.
NOTE The manufacturer can additionally specify a higher test temperature than 70 °C or a longer test
duration than 1 h.
Breaking capacity
Fuse-links shall be tested as appropriate to their a.c., d.c or a.c./d.c. rating as specified in 9.3.

Endurance test
Fuse-links shall be tested according to either method A or method B as specified in 9.4.

Maximum sustained dissipation
The maximum sustained dissipation shall be measured at test current I (A) or I (B) during the last
OVL OVL
10 min of the endurance test and shall not exceed the values specified in this standard sheet.

Temperature rise test
Fuse-links shall be tested according to method I or method II of 9.7.101, as specified by the manufacturer, or
according to 9.7.102.
9.7.101 Method I
The temperature rise shall not exceed 150 K (except 135 K for plastic body materials).
(The temperature during the last 30 s prior to opening shall be ignored).
9.7.101 Method II
The temperature rise shall not exceed 95 K.
9.7.102
If a fuse-holder is used, the temperature rise of the plastic material shall not exceed the respective RTI value.

60127-7  CEI:2013 – 23 –
Annex AA
(informative)
Guidance on ratings to be specified by the manufacturer
or to be agreed upon with the testing house

Subclause Rating Remark
9.2 t to t t and t are mandatory;
1 8 2 8
the values t and t shall be not more
2 8
than 1 h (t = 1 h) and 1 s (t =
2max 8max
1,00 s) respectively
t , t , t , t , t and t are optional
1 3 4 5 6 7
2,0 I or 2,1 I to be chosen for t and t
N N 1 2
9.2.2 I test current for an optional test at 70 °C
preferred values: 0,8 I or 1,0 I or 1,1 I

N N N
NOTE The manufacturer can additionally specify
a higher test temperature than 70 °C or a longer
test duration than 1 hour.
9.3 Breaking capacity may be specified for a.c. or d.c or
a.c./d.c.;
the specified rated breaking capacity
shall be not less than 35 A or 10 times
the rated current whichever is greater
I (A) or I (B)
9.4and 9.5 specification of cyclic test current
test test
according to test method A;
(A) is 1,0 I
the minimum value for I
test N
(I (A)min = 1,0 I )
test N
or of continuous current according to
method B;
the minimum value for I (B) is 0,8 I
test N
(I (B)min = 0,8 I )
test N
I (A) or I (B)
specification of overload current for
OVL OVL
endurance test
9.7.101 Method I: for fuse-links for use on printed circuit
boards:
initial current is
I (A) or I (B) test method I (step test) or test method II
OVL OVL
(1 hour overload) as determined by the
Method II:
manufacturer
test current is
(A) or I (B)
I
OVL OVL
9.7.102
test current is for fuse-links for use in fuse-holders
I
N
_____________
– 24 – 60127-7  CEI:2013
SOMMAIRE
AVANT-PROPOS . 25
INTRODUCTION . 27
1 Domaine d’application . 28
2 Références normatives .
...