IEC 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

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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

– 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

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;
– 4 – IEC 60127-3:2015 © IEC 2015
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.
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.

– 6 – IEC 60127-3:2015 © IEC 2015
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.

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.
– 8 – IEC 60127-3:2015 © IEC 2015
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
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
2 for fuse-links above 5 A
Figure 1 – Standard test board (see 7.3)

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.

– 10 – IEC 60127-3:2015 © IEC 2015
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.
– For the thrust test (Ua ), the force applied shall be 2 N.
– 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.

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;

– 12 – IEC 60127-3:2015 © IEC 2015
– 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:
– the thermocouple size shall be no larger than 0,05 mm (30 AWG).
Deletion of NOTE 1 and change NOTE 2 to NOTE.

Table 1 – Testing schedule for individual ampere ratings, standard sheet 1 and 2
Sub-miniature fuse-link no.
b b
1 4 7 10 13 16 19 22 25 28 31 34 37 40 43 46 49 52 55 58 61 64 E1 E4
Sub-
Description
b b
clause
2 5 8 11 14 17 20 23 26 29 32 35 38 41 44 47 50 53 56 59 62 65 E2 E5
b b
3 6 9 12 15 18 21 24 27 30 33 36 39 42 45 48 51 54 57 60 63 66 E3 E6

9.7 Fuse-link temperature          ×

9.4 Endurance test × ×
10   I
×
N
4,0  I      ×
N
a Time/current characteristic at
2,75  I          ×
9.2.1
N
normal ambient temperature
2,0  I           ×
N
1,0  I  ×
N
Breaking capacity
Rated breaking capacity 50A ~
×
Rated breaking capacity 50A
×
5 times the rated current 5 I  ~    ×
N
5 times the rated current 5 I     ×
N
10 times the rated current 10 I ~      ×
9.3
N
10 I
10 times the rated current       ×
N
50 times the rated current 50 I ~       ×
N
50 I
50 times the rated current        ×
N
250 times the rated current 250 I ~         ×
N
250 times the rated current 250 I
×
N
a
Insulation resistance   × × × ×  × × × × × ×
9.3.3
8.3 Terminations            × ×
a
Soldered joints × ×    × ×    × × ×
8.5
a
6.2 Legibility and indelibility of marking     × ×    × × ×

a
Subclause to be found in IEC 60127-1
b
the extra samples for termination test (E1 to E6) will be chosen by random and not sorted by voltage drop.

– 14 – IEC 60127-3:2015 © IEC 2015

Table 2 – Testing schedule for individual ampere ratings, standard sheet 3 and 4
Sub-miniature fuse-link no.
d d
1 4 7 10 13 16 19 22 25 28 31 34 37 40 43 46 49 E1 E4
Sub-
Description
clause d d
2 5 8 11 14 17 20 23 26 29 32 35 38 41 44 47 50 E2 E5
d d
3 6 9 12 15 18 21 24 27 30 33 36 39 42 45 48 51 E3 E6

9.7 Fuse-link temperature        ×

9.4 Endurance test × ×
c
a
Test at elevated temperature
9.2.2  ×
Time/current characteristic at 10 I
×
N
normal ambient temperature
4,0 I     ×
N
c
9.2.1
2,75 I       ×
N
2,1 I         ×
N
Breaking capacity
b
Rated breaking capacity 35A or 10 I   ×
N
5 times the rated current 5 I
×
N
9.3
10 times the rated current 10 I
×
N
50 times the rated current 50 I      ×
N
250 times the rated current 250 I       ×
N
c
Insulation resistance   × ×  × × ×
9.3.3
8.3 Terminations         × ×
c
8.5 Soldered joints × ×   × ×   × × ×
c
6.2 Legibility and indelibility of marking    × ×   × × ×

a
Applicable only when specified in the relevant standard sheet.
b
Whichever is greater.
c
Subclause to be found in IEC 60127-1.
d
The extra samples for termination test (E1 to E6) will be chosen by random and not sorted by voltage drop.

Table 3 – Testing schedule for maximum ampere rating of a homogeneous series, standard sheet 1 and 2
Fuse-link numbers in decreasing value of voltage drop
Sub- b b
7 10 33 36 39 42 45 48 51 54 E1 E4
Description
clause b b
1-6 8 11 13-17 18-22 23-32 34 37 40 43 46 49 52 55 E2 E5
b b
9 12 35 38 41 44 47 50 53 56 E3 E6

9.7 Fuse-link temperature      ×

9.4 Endurance test ×
10 I    ×
N
4 I     ×
N
a
9.2.1 Time/current characteristic 2,75 I
×
N
2,0 I
×
N
1,0 I ×
N
50 A a. c.  ×
9.3 Rated breaking capacity
50 A d. c.   ×
a
9.3.3 Insulation resistance  × ×
8.3 Terminations        × ×
a
8.5 Soldered joints × ×   × × × × ×
a
6.2 Legibility and indelibility of marking
× × × × ×
a
Subclause to be found in IEC 60127-1.
b
The extra samples for termination test (E1 to E6) will be chosen by random and not sorted by voltage drop.

– 16 – IEC 60127-3:2015 © IEC 2015

Table 4 – Testing schedule for maximum ampere rating of a homogeneous series, standard sheet 3 and 4
Fuse-link numbers in decreasing value of voltage drop
Sub- c c
7 10 28 31 34 37 40 43 46 49 E1 E4
Description
clause c c
1-6 8 11 13-17 18-27 29 32 35 38 41 44 47 50 E2 E5
c c
9 12 30 33 36 39 42 45 48 51 E3 E6

9.7 Fuse-link temperature      ×

9.4 Endurance test ×
a b
9.2.2 Test at elevated temperature  ×

10 I   ×
N
4 I
×
N
Time/current
a
9.2.1
characteristic
2,75 I
×
N
2,1 I       ×
N
Rated breaking
9.3 a.c.  ×
capacity
a
9.3.3 Insulation resistance  ×
8.3 Terminations       × ×
a
8.5 Soldered joints ×   × × × × ×
Legibility and indelibility of
a
6.2   × × × × ×
marking
a
Subclause to be found in IEC 60127-1.
b
Applicable only when specified in the relevant standard sheet.
c
The extra samples for termination test (E1 to E6) will be chosen by random and not sorted by voltage drop.

Table 5 – Testing schedule for minimum ampere
rating of a homogeneous series, standard sheet 1 to 4
Fuse-link numbers in decreasing value of voltage drop
Sub-
7 10 33 36
Description
clause
1-6 8 11 13-17 18-22 23-32 34 37
9 12 35 38
9.4 Endurance test ×
10 I ×
N
Time/current
a
9.2.1
characteristic
2.0 I or 2.1I    ×
N N
a.c.
×
Rated breaking
9.3
capacity d.c.
×
(if applicable)
a
Subclause to be found in IEC 60127-1.

– 18 – IEC 60127-3:2015 © IEC 2015
Addition:
10 Standard sheets
Sub-miniature fuse-links Standard sheet 1
Quick-acting, low breaking capacity Page 1
Dimensions in millimetres
IEC
NOTE Every cross-section shape within 10 mm × 10 mm is allowed.
Terminations
a) The length l of the terminations may be adapted for a lead taping type of packaging.
b) The termination shall go through a 1,0 mm hole and have a rated minimum cross-sectional area of 0,150 mm².
c) The cross-sectional shape of the termination is optional.
a
Rated current Rated Maximum Maximum sustained
voltage voltage drop power dissipation
b
V mV mW
2 mA 6 000 14
5 mA 3 000 17
10 mA 2 200 25
16 mA 1 500 27
32 mA 1 500 53
50 mA 1 000 55
63 mA 1 000 70
80 mA 1 000 88
100 mA 1 000 110
125 mA 1 000 138
160 mA 1 000 176
200 mA 700 140
250 mA 700 193
315 mA 700 243
400 mA 400 176
500 mA 400 220
630 mA 400 277
800 mA 400 372
1 A 190 209
1.25 A 190 261
1.6 A 190 334
2 A 190 418
2.5 A 190 523
3.15 A 190 658
4 A 190 836
5 A 190 1 045
a
Intermediate values shall be chosen from the R 20 or R 40 series according to
ISO 3.
b
Measured after 1 h at 1 IN.
Sub-miniature fuse-links Standard sheet 1
Quick-acting, low breaking capacity Page 2
Marking
Sub-miniature fuse-links shall be marked with the following:
a) rated current
b) rated voltage
c) manufacturer's name or trade mark
Pre-arcing time/current characteristic
The pre-arcing time shall be within the following limits:
Rated current I 2 I 2,75 I 4 I 10 I
N N N N N
min. max. max. max. max.
2 mA to 5 A inclusive 4 h 5 s 300 ms 30 ms 4 ms

Breaking capacity
Rated breaking capacity: 50 A, tested with a.c. and d.c. using the circuit given in Figure 3 for the breaking capacity test.
Endurance test
100 h minimum at a continuous current of 0,8 times the rated current, according to test method B of 9.4.3.
Sub-miniature fuse-link contact test
The contact leads shall be evaluated in accordance with 8.3 for:
a) tensile
b) thrust
c) bending (applicable only if the length of the terminations is over 5 mm)
Sub-miniature fuse-link temperature-rise test
The initial current according to 9.7 shall be I .
N
The maximum operating ambient temperature is +85 °C. When the sub-miniature fuse-link is operating under these conditions
the current load should be reduced to 0,9 I .
N
– 20 – IEC 60127-3:2015 © IEC 2015
Sub-miniature fuse-links Standard sheet 2
Quick-acting, low-breaking capacity Page 1
Dimensions in millimetres
≥ 2,5 mm (250 V)
≥ 1,3 mm (125 V)
IEC
Or as alternative
≥ 2,5 mm (250 V)
≥ 1,3 mm (125 V)
IEC
NOTE Every cross-section shape within 10 mm × 10 mm is allowed.
Terminations
.
a) The termination shall go through a 1,5 mm hole and have a rated minimum cross-sectional area of 0,150 mm
b) The cross-sectional shape of the termination is optional.

Sub-miniature fuse-links Standard sheet 2
Quick-acting Page 2
Low-breaking capacity
a
Rated current Rated Maximum Maximum sustained
voltage voltage drop power dissipation
C b
V mV mW
50 mA 2 250 123
63 mA 2 230 154
80 mA 2 200 194
100 mA 1 750 193
125 mA 1 500 206
160 mA 1 500 264
200 mA 1 500 330
250 mA 1 000 275
315 mA 1 000 347
375 mA 1 000 400
400 mA 1 000 440
500 mA 1 000 550
630 mA 500 347
750 mA 350 300
800 mA 125 or 250 275 242
1 A 275 303
1,25 A 275 378
1,5 A 275 420
1,6 A 275 484
2 A 250 550
2,5 A 250 688
3 A 250 750
3,15 A 250 866
4 A 225 990
5 A 225 1 238
6,3 A 190 1 300
7 A 180 1 300
8 A 160 1 400
10 A 150 1 600
a
Intermediate values shall be chosen from the R 20 or R 40 series according to
ISO 3.
b
Measured after 1 h at 1 I .
N
c
Rated voltage to be declared by manufacturer

– 22 – IEC 60127-3:2015 © IEC 2015
Sub-miniature fuse-links Standard sheet 2
Quick-acting Page 3
Low-breaking capacity
Marking
Sub-miniature fuse-links shall be marked with the following:
a) rated current
b) manufacturer's name or trade mark
+0,1
mm.
Where colour bands are used, the values for d and s should be 0,4
Pre-arcing time/current characteristic
The pre-arcing time shall be within the following limits:
Rated current I 2 I 2,75 I 4 I 10 I
N N N N N
min. max. max. max. max.
50 mA to 10 A inclusive 4 h 5 s 300 ms 30 ms 4 ms

Breaking capacity
Rated breaking capacity: 50 A, tested with a.c. and d.c. using the circuit given in Figure 3 for the breaking capacity test.
Endurance test
100 h minimum at a continuous current of 0,8 times the rated current, according to test method B of 9.4.3.
Sub-miniature fuse-link contact test
The contact leads shall be evaluated in accordance with 8.3 for:
a) tensile
b) bending (applicable only if the length of the terminations is over 5 mm)
Sub-miniature fuse-link temperature-rise test
The initial current according to 9.7 shall be I .
N
The maximum operating ambient temperature is +85 °C. When the sub-miniature fuse-link is operating under these conditions
the current load should be reduced to 0,9 I .
N
Sub-miniature fuse-links Standard sheet 3
Quick-acting Page 1
Low-breaking capacity
Dimensions in millimetres
a
IEC
Or as alternative
a
IEC
NOTE 1 Every cross-section shape within 10 mm × 10 mm is allowed.
Terminations
a) Any shape and location is allowed as long as the 0,5 mm is guaranteed.

– 24 – IEC 60127-3:2015 © IEC 2015

Sub-miniature fuse-links Standard sheet 3
Quick-acting Page 2
Low-breaking capacity
Dimensions in millimetres
Or as alternative
IEC
Or as alternative
IEC
NOTE 2 Every cross-section shape within 10 mm × 10 mm is allowed.
Terminations
a) The length l of the terminations may be adapted for a lead taping type of packaging.
b) The termination shall go through a 1,5 mm hole and have a rated minimum cross-sectional area of 0,150 mm .
c) The cross-sectional shape of the termination is optional.
a
Rated current Rated Maximum Maximum sustained

voltage voltage drop power dissipation
b
V mV mW
50 mA 850 112
63 mA 750 124
80 mA 650 137
100 mA 600 158
125 mA 550 180
160 mA 500 210
200 mA 480 252
250 mA 440 289
315 mA 400 331
400 mA 370 389
500 mA 350 459
630 mA 320 529
800 mA 300 630
1 A 280 735
1,25 A 280 919
1,6 A 250 1 050
2 A 240 1 260
2,5 A 200 1 313
3,15 A 180 1 488
4 A 160 1 680
5 A 150 1 969
6,3 A 130 2 000
8 A 100 2 000
10 A 85 2 000
a
Intermediate values shall be chosen from the R 20 or R 40 series according to
ISO 3.
b
Measured after 1 h at 1,5 IN.
Sub-miniature fuse-links Standard sheet 3
Quick-acting Page 3
Low-breaking capacity
Marking
Sub-miniature fuse-links shall be marked with the following:
a) rated current
b) rated voltage
c) manufacturer's name or trade mark
d) characteristic symbol F
Pre-arcing time/current characteristic
The pre-arcing time shall be within the following limits:
Rated current 2,1 I 2,75 I 4 I 10 I
N N N N
max. min. max. min. max. max.
50 mA to 5 A inclusive 30 min 10 ms 3 s 3 ms 300 ms 20 ms
6,3 A to 10 A inclusive 30 min 50 ms 10 s 5 ms 400 ms 20 ms

Breaking capacity
Rated breaking capacity: 35 A or 10 I , whichever is greater, tested with a.c. and using the circuit given in Figure 3 for the
N
breaking capacity test.
Endurance test
100 cycles at rated current according to test method A of 9.4.2, followed by 1 h at 1,5 times the rated current.
Sub-miniature fuse-link contact test
The contact leads shall be evaluated in accordance with 8.3 for:
a) tensile
b) thrust
c) bending (applicable only if the length of the terminations is over 5 mm)
Sub-miniature fuse-link temperature-rise test
The initial current according to 9.7 shall be 1,5 I .
N
The maximum operating ambient temperature is +85 °C. When the sub-miniature fuse-link is operating under these conditions
the current load should be reduced to 0,9 I .
N
– 26 – IEC 60127-3:2015 © IEC 2015

Sub-miniature fuse-links Standard sheet 4
Time-lag Page 1
Low-breaking capacity
Dimensions in millimetres
IEC
Or as alternative
IEC
Sub-miniature fuse-links Standard sheet 4
Time-lag Page 2
Low-breaking capacity
Dimensions in millimetres
Or as alternative
IEC
...

IEC 60127-3 ®
Edition 3.1 2020-07
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Miniature fuses –
Part 3: Sub-miniature fuse-links

Coupe-circuit miniatures –
Partie 3: Éléments de remplacement subminiatures

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IEC 60127-3 ®
Edition 3.1 2020-07
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
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 978-2-8322-9540-3

IEC 60127-3 ®
Edition 3.1 2020-07
CONSOLIDATED VERSION
REDLINE VERSION
VERSION REDLINE
colour
inside
Miniature fuses –
Part 3: Sub-miniature fuse-links

Coupe-circuit miniatures –
Partie 3: Éléments de remplacement subminiatures

– 2 – IEC 60127-3:2015+AMD1:2020 CSV
© IEC 2020
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
Annex A (normative) Sub-miniature fuse-links according to standard sheet 3 and 4
with optional DC ratings . 29

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
Figure A 1 – Test circuits for breaking capacity tests . 31

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
Table A.1 – Testing schedule . 29
Table A.2 – Time constant . 30

© IEC 2020
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
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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
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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.
This consolidated version of the official IEC Standard and its amendment has been
prepared for user convenience.
IEC 60127-3 edition 3.1 contains the third edition (2015-01) [documents 32C/501/FDIS
and 32C/506/RVD] and its amendment 1 (2020-07) [documents 32C/586/FDIS and
32C/589/RVD].
In this Redline version, a vertical line in the margin shows where the technical content
is modified by amendment 1. Additions are in green text, deletions are in strikethrough
red text. A separate Final version with all changes accepted is available in this
publication.
– 4 – IEC 60127-3:2015+AMD1:2020 CSV
© IEC 2020
International Standard IEC 60127-3 has been prepared by subcommittee 32C: Miniature fuses,
of IEC technical committee 32: Fuses.
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;
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.
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 the base publication and its amendment 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.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
© IEC 2020
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.

– 6 – IEC 60127-3:2015+AMD1:2020 CSV
© IEC 2020
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.

© IEC 2020
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.
– 8 – IEC 60127-3:2015+AMD1:2020 CSV
© IEC 2020
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
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
2 for fuse-links above 5 A
Figure 1 – Standard test board (see 7.3)

© IEC 2020
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.

– 10 – IEC 60127-3:2015+AMD1:2020 CSV
© IEC 2020
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.
– For the thrust test (Ua ), the force applied shall be 2 N.
– 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.

© IEC 2020
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;

– 12 – IEC 60127-3:2015+AMD1:2020 CSV
© IEC 2020
– 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:
– the thermocouple size shall be no larger than 0,05 mm (30 AWG).
Deletion of NOTE 1 and change NOTE 2 to NOTE.

© IEC 2020
Table 1 – Testing schedule for individual ampere ratings, standard sheet 1 and 2
Sub-miniature fuse-link no.
b b
1 4 7 10 13 16 19 22 25 28 31 34 37 40 43 46 49 52 55 58 61 64 E1 E4
Sub-
Description
b b
clause
2 5 8 11 14 17 20 23 26 29 32 35 38 41 44 47 50 53 56 59 62 65 E2 E5
b b
3 6 9 12 15 18 21 24 27 30 33 36 39 42 45 48 51 54 57 60 63 66 E3 E6

9.7 Fuse-link temperature          ×

9.4 Endurance test × ×
10   I     ×
N
4,0  I      ×
N
Time/current characteristic at
a
×
9.2.1 2,75  I
N
normal ambient temperature
2,0  I           ×
N
1,0  I  ×
N
Breaking capacity
Rated breaking capacity 50A ~   ×
50A
Rated breaking capacity   ×
×
5 times the rated current 5 I  ~
N
5 times the rated current 5 I    ×

N
10 times the rated current 10 I ~      ×
9.3
N
10 times the rated current 10 I       ×

N
50 times the rated current 50 I ~       ×
N
50 I
50 times the rated current        ×
N
250 times the rated current 250 I ~         ×
N
250 I
250 times the rated current         ×
N
a
9.3.3 Insulation resistance   × × × ×  × × × × × ×
× ×
8.3 Terminations
a
Soldered joints × ×    × ×    × × ×
8.5
a
Legibility and indelibility of marking     × ×    × × ×
6.2
a
Subclause to be found in IEC 60127-1
b
the extra samples for termination test (E1 to E6) will be chosen by random and not sorted by voltage drop.

– 14 – IEC 60127-3:2015+AMD1:2020 CSV
© IEC 2020
Table 2 – Testing schedule for individual ampere ratings, standard sheet 3 and 4
Sub-miniature fuse-link no.
d d
1 4 7 10 13 16 19 22 25 28 31 34 37 40 43 46 49 E1 E4
Sub-
Description
clause d d
2 5 8 11 14 17 20 23 26 29 32 35 38 41 44 47 50 E2 E5
d d
3 6 9 12 15 18 21 24 27 30 33 36 39 42 45 48 51 E3 E6

9.7 Fuse-link temperature        ×

9.4 Endurance test × ×
c a
9.2.2 Test at elevated temperature   ×
Time/current characteristic at
10 I    ×
N
normal ambient temperature
×
4,0 I
N
c
9.2.1
2,75 I       ×
N
2,1 I         ×
N
Breaking capacity
b
Rated breaking capacity 35A or 10 I   ×
N
5 times the rated current 5 I   ×
N
9.3
10 times the rated current 10 I     ×
N
50 times the rated current 50 I      ×
N
250 times the rated current 250 I       ×
N
c
Insulation resistance   × ×  × × ×
9.3.3
8.3 Terminations         × ×
c
8.5 Soldered joints × ×   × ×   × × ×
c
6.2 Legibility and indelibility of marking    × ×   × × ×

a
Applicable only when specified in the relevant standard sheet.
b
Whichever is greater.
c
Subclause to be found in IEC 60127-1.
d
The extra samples for termination test (E1 to E6) will be chosen by random and not sorted by voltage drop.

© IEC 2020
Table 3 – Testing schedule for maximum ampere rating of a homogeneous series, standard sheet 1 and 2
Fuse-link numbers in decreasing value of voltage drop
Sub- b b
7 10 33 36 39 42 45 48 51 54 E1 E4
Description
clause
b b
1-6 8 11 13-17 18-22 23-32 34 37 40 43 46 49 52 55 E2 E5
b b
9 12 35 38 41 44 47 50 53 56 E3 E6
9.7 Fuse-link temperature      ×

9.4 Endurance test ×
10 I    ×
N
4 I     ×
N
a
9.2.1 Time/current characteristic 2,75 I      ×
N
2,0 I       ×
N
1,0 I ×
N
50 A a. c.  ×
9.3 Rated breaking capacity
50 A d. c.   ×
a
9.3.3 Insulation resistance  × ×
8.3 Terminations        × ×
a
8.5 Soldered joints × ×   × × × × ×
a
6.2 Legibility and indelibility of marking    × × × × ×

a
Subclause to be found in IEC 60127-1.
b
The extra samples for termination test (E1 to E6) will be chosen by random and not sorted by voltage drop.

– 16 – IEC 60127-3:2015+AMD1:2020 CSV
© IEC 2020
Table 4 – Testing schedule for maximum ampere rating of a homogeneous series, standard sheet 3 and 4
Fuse-link numbers in decreasing value of voltage drop
Sub- c c
7 10 28 31 34 37 40 43 46 49 E1 E4
Description
clause
c c
1-6 8 11 13-17 18-27 29 32 35 38 41 44 47 50 E2 E5
c c
9 12 30 33 36 39 42 45 48 51 E3 E6
9.7 Fuse-link temperature      ×

9.4 Endurance test ×
a b
9.2.2 Test at elevated temperature  ×

10 I   ×
N
4 I    ×
Time/current N
a
9.2.1
characteristic
2,75 I     ×
N
2,1 I       ×
N
Rated breaking
9.3 a.c.  ×
capacity
a
9.3.3 Insulation resistance  ×
8.3 Terminations       × ×
a
8.5 Soldered joints ×   × × × × ×
Legibility and indelibility of

a
6.2   × × × × ×
marking
a
Subclause to be found in IEC 60127-1.
b
Applicable only when specified in the relevant standard sheet.
c
The extra samples for termination test (E1 to E6) will be chosen by random and not sorted by voltage drop.

© IEC 2020
Table 5 – Testing schedule for minimum ampere
rating of a homogeneous series, standard sheet 1 to 4
Fuse-link numbers in decreasing value of voltage drop
Sub-
7 10 33 36
Description
clause
1-6 8 11 13-17 18-22 23-32 34 37
9 12 35 38
9.4 Endurance test ×
10 I ×
N
Time/current
a
9.2.1
characteristic
2.0 I or 2.1I    ×
N N
a.c.  ×
Rated breaking
9.3
d.c.
capacity
×
(if applicable)
a
Subclause to be found in IEC 60127-1.

– 18 – IEC 60127-3:2015+AMD1:2020 CSV
© IEC 2020
Addition:
10 Standard sheets
Sub-miniature fuse-links Standard sheet 1
Quick-acting, low breaking capacity Page 1
Dimensions in millimetres
IEC
NOTE Every cross-section shape within 10 mm × 10 mm is allowed.
Terminations
a) The length l of the terminations may be adapted for a lead taping type of packaging.
b) The termination shall go through a 1,0 mm hole and have a rated minimum cross-sectional area of 0,150 mm².
c) The cross-sectional shape of the termination is optional.
a
Rated current Rated Maximum Maximum sustained
voltage voltage drop power dissipation
b
V mV mW
2 mA 6 000 14
5 mA 3 000 17
10 mA 2 200 25
16 mA 1 500 27
32 mA 1 500 53
50 mA 1 000 55
63 mA 1 000 70
80 mA 1 000 88
100 mA 1 000 110
125 mA 1 000 138
160 mA 1 000 176
200 mA 700 140
250 mA 700 193
315 mA 700 243
400 mA 400 176
500 mA 400 220
630 mA 400 277
800 mA 400 372
1 A 190 209
1.25 A 190 261
1.6 A 190 334
2 A 190 418
2.5 A 190 523
3.15 A 190 658
4 A 190 836
5 A 190 1 045
a
Intermediate values shall be chosen from the R 20 or R 40 series according to
ISO 3.
b
Measured after 1 h at 1 IN.
© IEC 2020
Sub-miniature fuse-links Standard sheet 1
Quick-acting, low breaking capacity Page 2
Marking
Sub-miniature fuse-links shall be marked with the following:
a) rated current
b) rated voltage
c) manufacturer's name or trade mark
Pre-arcing time/current characteristic
The pre-arcing time shall be within the following limits:
Rated current I 2 I 2,75 I 4 I 10 I
N N N N N
min. max. max. max. max.
2 mA to 5 A inclusive 4 h 5 s 300 ms 30 ms 4 ms

Breaking capacity
Rated breaking capacity: 50 A, tested with a.c. and d.c. using the circuit given in Figure 3 for the breaking capacity test.
Endurance test
100 h minimum at a continuous current of 0,8 times the rated current, according to test method B of 9.4.3.
Sub-miniature fuse-link contact test
The contact leads shall be evaluated in accordance with 8.3 for:
a) tensile
b) thrust
c) bending (applicable only if the length of the terminations is over 5 mm)
Sub-miniature fuse-link temperature-rise test
The initial current according to 9.7 shall be I .
N
The maximum operating ambient temperature is +85 °C. When the sub-miniature fuse-link is operating under these conditions
the current load should be reduced to 0,9 I .
N
– 20 – IEC 60127-3:2015+AMD1:2020 CSV
© IEC 2020
Sub-miniature fuse-links Standard sheet 2
Quick-acting, low-breaking capacity Page 1
Dimensions in millimetres
≥ 2,5 mm (250 V)
≥ 1,3 mm (125 V)
IEC
Or as alternative
≥ 2,5 mm (250 V)
≥ 1,3 mm (125 V)
IEC
NOTE Every cross-section shape within 10 mm × 10 mm is allowed.
Terminations
a) The termination shall go through a 1,5 mm hole and have a rated minimum cross-sectional area of 0,150 mm .
b) The cross-sectional shape of the termination is optional.

© IEC 2020
Sub-miniature fuse-links Standard sheet 2
Quick-acting Page 2
Low-breaking capacity
a
Rated current Rated Maximum Maximum sustained
voltage voltage drop power dissipation
C b
V mV mW
50 mA 2 250 123
63 mA 2 230 154
80 mA 2 200 194
100 mA 1 750 193
125 mA 1 500 206
160 mA 1 500 264
200 mA 1 500 330
250 mA 1 000 275
315 mA 1 000 347
375 mA 1 000 400
400 mA 1 000 440
500 mA 1 000 550
630 mA 500 347
750 mA 350 300
800 mA 125 or 250 275 242
1 A 275 303
1,25 A 275 378
1,5 A 275 420
1,6 A 275 484
2 A 250 550
2,5 A 250 688
3 A 250 750
3,15 A 250 866
4 A 225 990
5 A 225 1 238
6,3 A 190 1 300
7 A 180 1 300
8 A 160 1 400
10 A 150 1 600
a
Intermediate values shall be chosen from the R 20 or R 40 series according to
ISO 3.
b
Measured after 1 h at 1 I .
N
c
Rated voltage to be declared by manufacturer

– 22 – IEC 60127-3:2015+AMD1:2020 CSV
© IEC 2020
Sub-miniature fuse-links Standard sheet 2
Quick-acting Page 3
Low-breaking capacity
Marking
Sub-miniature fuse-links shall be marked with the following:
a) rated current
b) manufacturer's name or trade mark
+0,1
Where colour bands are used, the values for d and s should be 0,4 mm.
Pre-arcing time/current characteristic
The pre-arcing time shall be within the following limits:
Rated current I 2 I 2,75 I 4 I 10 I
N N N N N
min. max. max. max. max.
50 mA to 10 A inclusive 4 h 5 s 300 ms 30 ms 4 ms

Breaking capacity
Rated breaking capacity: 50 A, tested with a.c. and d.c. using the circuit given in Figure 3 for the breaking capacity test.
Endurance test
100 h minimum at a continuous current of 0,8 times the rated current, according to test method B of 9.4.3.
Sub-miniature fuse-link contact test
The contact leads shall be evaluated in accordance with 8.3 for:
a) tensile
b) bending (applicable only if the length of the terminations is over 5 mm)
Sub-miniature fuse-link temperature-rise test
The initial current according to 9.7 shall be I .
N
The maximum operating ambient temperature is +85 °C. When the sub-miniature fuse-link is operating under these conditions
the current load should be reduced to 0,9 I .
N
© IEC 2020
Sub-miniature fuse-links Standard sheet 3
Quick-acting Page 1
Low-breaking capacity
Dimensions in millimetres
a
IEC
Or as alternative
a
IEC
NOTE 1 Every cross-section shape within 10 mm × 10 mm is allowed.
Terminations
a) Any shape and location is allowed as long as the 0,5 mm is guaranteed.

– 24 – IEC 60127-3:2015+AMD1:2020 CSV
© IEC 2020
Sub-miniature fuse-links Standard sheet 3
Quick-acting Page 2
Low-breaking capacity
Dimensions in millimetres
Or as alternative
IEC
Or as alternative
IEC
NOTE 2 Every cross-section shape within 10 mm × 10 mm is allowed.
Terminations
a) The length l of the terminations may be adapted for a lead taping type of packaging.
b) The termination shall go through a 1,5 mm hole and have a rated minimum cross-sectional area of 0,150 mm .
c) The cross-sectional shape of the termination is optional.
a
Rated current Rated Maximum Maximum sustained

voltage voltage drop power dissipation
b
V mV mW
50 mA 850 112
63 mA 750 124
80 mA 650 137
100 mA 600 158
125 mA 550 180
160 mA 500 210
200 mA 480 252
250 mA 440 289
315 mA 400 331
400 mA 370 389
500 mA 350 459
630 mA 320 529
800 mA 300 630
1 A 280 735
1,25 A 280 919
1,6 A 250 1 050
2 A 240 1 260
2,5 A 200 1 313
3,15 A 180 1 488
4 A 160 1 680
5 A 150 1 969
6,3 A 130 2 000
8 A 100 2 000
10 A 85 2 000
a
Intermediate values shall be chosen from the R 20 or R 40 series according to
ISO 3.
b
Measured after 1 h at 1,5 IN.
© IEC 2020
Sub-miniature fuse-links Standard sheet 3
Quick-acting Page 3
Low-breaking capacity
Marking
Sub-miniature fuse-links shall be marked with the following:
a) rated current
b) rated voltage
c) manufacturer's name or trade mark
d) characteristic symbol F
Pre-arcing time/current characteristic
The pre-arcing time shall be within the following limits:
Rated current 2,1 I 2,75 I 4 I 10 I
N N N N
max. min. max. min. max. max.
50 mA to 5 A inclusive 30 min 10 ms 3 s 3 ms 300 ms 20 ms
6,3 A to 10 A inclusive 30 min 50 ms 10 s 5 ms 400 ms 20 ms

Breaking capacity
, whichever is greater, tested with a.c. and using the circuit given in Figure 3 for the
Rated breaking
...