IEC 60127-2:2014

IEC 60127-2 ®
Edition 3.0 2014-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Miniature fuses –
Part 2: Cartridge fuse-links
Coupe-circuit miniatures –
Partie 2: Cartouches
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IEC 60127-2 ®
Edition 3.0 2014-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Miniature fuses –
Part 2: Cartridge fuse-links
Coupe-circuit miniatures –
Partie 2: Cartouches
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
X
CODE PRIX
ICS 29.120.50 ISBN 978-2-8322-1844-0

– 2 – IEC 60127-2:2014 © IEC 2014
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope and object . 7
2 Normative references. 7
3 Terms and definitions . 7
4 General requirements . 7
5 Standard ratings . 7
6 Marking . 8
7 General notes on tests . 8
8 Dimensions and construction . 14
9 Electrical requirements . 16
10 Standard sheets . 18
Annex A (normative) Miniature fuse-links with wire terminations . 38
A.1 General . 38
A.2 Scope . 38
A.3 General notes on tests . 38
A.3.1 Type tests . 38
A.3.2 Testing schedule . 38
A.3.3 Test bases for tests . 39
A.4 Dimensions and construction . 41
A.4.1 Dimensions . 41
A.4.2 Mechanical tests on terminations . 41
A.4.3 Solderability of terminations . 42
A.4.4 Resistance to soldering heat . 42
A.5 Electrical requirements . 42
A.5.1 Voltage drop . 43
A.5.2 Time/current characteristic at normal ambient temperature . 43
A.5.3 Breaking capacity . 43
A.5.4 Fuse-link temperature . 43
Bibliography . 44

Figure 1 – Test fuse-base for 5 mm × 20 mm and 6,3 mm × 32 mm fuse-links – Rated
currents up to and including 6,3 A (see 7.3) . 11
Figure 2 – Test fuse-base for 5 mm × 20 mm and 6,3 mm × 32 mm fuse-links – Rated
currents exceeding 6,3 A (see 7.3) . 12
Figure 3 – Test fuse-base for breaking capacity tests (see 7.3) . 13
Figure 4 – Axial pull test apparatus . 15
Figure 5 – Alignment gauge (see 8.4) . 16
Figure 6 – Typical test circuit for breaking-capacity tests for high-breaking capacity
fuse-links (see 9.3) . 17
Figure 7 – Typical test circuit for breaking-capacity tests for low- and enhanced-
breaking capacity fuse-links (see 9.3) . 17
Figure A.1 – Test board . 39

Figure A.2 – Test base . 40
Figure A.3 – Dimensions of fuse-link with wire terminations . 41

Table 1 – Testing schedule for individual ampere ratings . 9
Table 2 – Testing schedule for maximum ampere rating of a homogeneous series . 9
Table 3 – Testing schedule for minimum ampere rating of a homogeneous series . 10
Table A.1 – Testing schedule . 39

– 4 – IEC 60127-2:2014 © IEC 2014
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MINIATURE FUSES –
Part 2: Cartridge 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
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4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
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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
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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 60127-2 has been prepared by subcommittee 32C: Miniature fuses,
of IEC technical committee 32: Fuses.
This third edition of IEC 60127-2 cancels and replaces the second edition published in 2003,
amendment 1 (2003) and amendment 2 (2010). This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) add 4 new standard sheets 7 up to 10.
This International Standard is to be used in conjunction with IEC 60127-1:2006.

The text of this standard is based on the following documents:
FDIS Report on voting
32C/493/FDIS 32C/498/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.
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”, “modification” or “replacement”, the relevant text in IEC 60127-1 is
to be adapted accordingly.
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.
– 6 – IEC 60127-2:2014 © IEC 2014
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.

MINIATURE FUSES –
Part 2: Cartridge fuse-links
1 Scope and object
This part of IEC 60127 relates to special requirements applicable to cartridge fuse-links for
miniature fuses with dimensions measuring 5 mm × 20 mm and 6,3 mm × 32 mm for the
protection of electric appliances, electronic equipment and component parts thereof, normally
intended for use indoors.
It does not apply to cartridge 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.
The object of this standard is to define special and additional test methods for cartridge 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 60068-2-20, Environmental testing – Part 2-20: Tests – Test T: Test methods for
solderability and resistance to soldering heat of devices with leads
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
Amendment 1:2011
ISO 3, Preferred numbers – Series of preferred numbers
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60127-1:2006,
Clause 3, apply.
4 General requirements
Clause 4 of IEC 60127-1:2006 applies.
5 Standard ratings
Clause 5 of IEC 60127-1:2006 applies.

– 8 – IEC 60127-2:2014 © IEC 2014
6 Marking
Clause 6 of IEC 60127-1:2006 applies except as follows:
6.1 Addition:
e) A symbol denoting the rated breaking capacity. This symbol shall be placed between the
marking for the rated current and the marking for the rated voltage.
These symbols are
H denoting high breaking capacity,
L denoting low breaking capacity,
E denoting enhanced breaking capacity.
EXAMPLES of marking:
T 3 1 5 L 2 5 0 V
F 4 H 2 5 0 V
T 3 1 5 E 2 5 0 V
6.4 Add the following paragraph after the first paragraph:
The values for “d” and “s” shall be 0,8 mm ± 0,2 mm.
7 General notes on tests
Clause 7 of IEC 60127-1:2006 applies except as follows:
7.2.1 Addition:
For testing individual fuse ratings, the number of fuse-links required is 48, of which 12 are
kept as spares. The testing schedule is shown in Table 1.
For the maximum ampere rating of a homogeneous series, the number of fuse-links required
is 48, of which 22 are kept as spares. The testing schedule is shown in Table 2.
For the minimum ampere rating of a homogeneous series the number of fuse-links required
is 33, of which 16 are kept as spares. The testing schedule is shown in Table 3.

Table 1 – Testing schedule for individual ampere ratings
Sub- Description Fuse-link no.
clause
1- 7 8 12 16 19 22 23 28 31 34 35 40 43 46
6 9 10 14 17 20 24 25 29 32 36 37 41 44 47
11 13 15 18 21 26 27 30 33 38 39 42 45 48
a
9.4 Endurance test X
a b
9.2.2 Test at elevated temperature   X
a
9.2.1 Time/current 10 I X
N
characteristics
4 I    X
N
2,75 I      X
N
2,0 I or 2,1 I        X
N N
9.3 Breaking capacity test:  X
Rated breaking capacity
5 times the rated current   X
10 times the rated current     X
50 times the rated current     X
250 times the rated current       X
8.3 Terminations (end cap test) X   X  X  X
a
8.5 Soldered joints X X  X X  X  X
a
6.2 Legibility and indelibility of marking X   X  X  X
a
These subclauses are to be found in IEC 60127-1.
b
Applicable only when specified on the standard sheet.

Table 2 – Testing schedule for maximum ampere rating of a homogeneous series
Fuse-link numbers in decreasing value
of voltage drop
Sub-
Description
1-6 7 10 13- 18- 28 31 34 37 40 43 46
clause
8 11 17 27 29 32 35 38 41 44 47
9 12 30 33 36 39 42 45 48
a
9.4 Endurance test X
a b
9.2.2 Test at elevated temperature    X
a
9.2.1 Time/current 10 I
N
X
characteristics
4 I    X
N
2,75 I     X
N
2,0 I or 2,1 I      X
N N
9.3 Rated breaking capacity  X
8.3 Terminations (end cap test) X   X X X
a
8.5 Soldered joints X X  X X X X
a
6.2 Legibility and indelibility of marking X   X X X
a
These subclauses are to be found in IEC 60127-1.
b
Applicable only when specified on the standard sheet.

– 10 – IEC 60127-2:2014 © IEC 2014
Table 3 – Testing schedule for minimum ampere rating of a homogeneous series
Fuse-link numbers in decreasing
value of voltage drop
Sub-
Description
7 10 28 31
clause
1-6 8 11 13-17 18-27 29 32
9 12 30 33
a
9.4 Endurance test X
a
9.2.1 Time/current characteristics 10 I X
N
2,0 I or 2,1 I
X
N N
9.3 Rated breaking capacity  X
a
These subclauses are to be found in IEC 60127-1.

Replacement:
7.3 Fuse-bases for tests
For tests that require a fuse-base for mounting the fuse-links, bases according to Figures 1, 2
or 3, shall be used as appropriate.
The contact resistance between each contact and a silvered brass piece having the same
nominal dimensions and shape as the fuse-link to be tested shall not exceed 3 mΩ and is
measured under the following conditions:
a) in order to prevent the breakdown of thin insulating layers on the contacts, the e.m.f. of
the circuit shall not exceed 20 mV (d.c. or a.c. peak);
b) in order to prevent undue heating of the contacts, the current flowing shall not exceed 1 A.
Metal parts of the fuse-base, except the spring and connections, shall be made of brass.
Brass parts of the fuse-base and of the gauge for measuring contact resistance shall have a
copper content of between 58 % and 70 %. Contacts shall be silver-plated.
For fuse-links with rated currents up to and including 6,3 A, a fuse-base according to Figure 1
shall be used. The contact force shall be between 4 N and 6 N. The flexible lead and terminal
wires shall be of copper and shall have a cross-sectional area of 1 mm ; the length of each of
the terminal wires being approximately 500 mm.
For fuse-links with rated currents exceeding 6,3 A, a fuse-base according to Figure 2 shall be
used. The contact force shall be between 8 N and 12 N. The flexible lead and terminal wires
shall be of copper and shall have a cross-sectional area of 6 mm ; the length of each of the
terminal wires being approximately 500 mm.
For breaking capacity tests, a fuse-base according to Figure 3, with the same contact force
and conductor cross-sectional area as for the base in Figure 2, shall be used.

Dimensions in millimetres with tolerance of 0,1 mm
Fuse-links a b
mm mm
5 mm × 20 mm 20 48
32 60
6,3 mm × 32 mm
Hole ∅1
Fuse-link contact (end cap)
8 b
a
Fuse-link
Base of low heat conducting insulating material
Terminal wire
IEC
Figure 1 – Test fuse-base for 5 mm × 20 mm and 6,3 mm × 32 mm fuse-links –
Rated currents up to and including 6,3 A (see 7.3)
17,5
∅3
∅9
∅10
80°± 2°
– 12 – IEC 60127-2:2014 © IEC 2014
Dimensions in millimetres with tolerances of 0,1 mm
Fuse-links a b
mm mm
5 mm × 20 mm 20 48
32 60
6,3 mm × 32 mm
Hole ∅1 5,5
12 b
a
IEC
Figure 2 – Test fuse-base for 5 mm × 20 mm and 6,3 mm × 32 mm fuse-links –
Rated currents exceeding 6,3 A (see 7.3)
15 24
17,5
∅6
∅9
∅10
80°± 2°
Dimensions in millimetres with tolerance of 0,1 mm
Fuse-links a b
mm mm
5 mm × 20 mm 20 67
32 79
6,3 mm × 32 mm
b
a
IEC
Figure 3 – Test fuse-base for breaking capacity tests (see 7.3)
∅2
∅8
120°
– 14 – IEC 60127-2:2014 © IEC 2014
8 Dimensions and construction
Clause 8 of IEC 60127-1:2006 applies except as follows:
8.2 Construction
Addition:
Where a “non-transparent” fuse-link is specified, a transparent case (body) may be used
provided that there is an opaque filler.
This standard is based on the assumption that the case (body) is made of glass, ceramic or
similar non-combustible material.
8.3 Terminations
Additon:
Fuse-links shall have at each end a metallic cap of cylindrical form.
The outer ends of the cylindrical caps shall be substantially flat and at right angles to the axis.
The end caps shall be firmly attached so that it is not possible to remove them without
damaging the fuse-link.
Compliance is checked by inspection and by the following test:
The samples are immersed in water for 24 h at a temperature of between 15 °C and 35 °C.
After removal from the water, and axial pull steadily increasing to 5 N is applied to each cap
for 1 min.
The caps shall remain firmly attached.
A suitable test apparatus for this purpose is given in Figure 4 and shall be used in cases of
dispute. By using this apparatus, the test can be performed without distorting the end caps.

Dimensions in millimetres
IEC
The device has 3 tubes (1, 2, 3) sliding within each other.
The outer tube (1) has an opening at its upper end and a fixture receiving one end of the test sample.
The intermediate tube (2) similarly has a recess at its upper end and a fixture receiving the other end of the test
sample.
The inner tube (3) is connected with tube (2) by means of a spring (4).
Moving downward tube (3) by pulling with knob (5) extends spring (4) and thus applies a steadily increasing axial
force to tube (2) and to the test specimen.
The varying length of fuse cap and total link will be compensated by the sliding tube (2). Its lower end (6) appears
within the observation window (7) and serves as a reference mark. The other mark (dashed line) together with the
indication “5 N” is printed on tube (3). Coincidence of both marks is attained by adequately moving down knob (5),
which can be screwed tight in this position.
Screw (8) ensures alignment of tubes (1) and (2).
The testing device is to be used and calibrated in the vertical position with the fuse under test at the top.
Figure 4 – Axial pull test apparatus
8.4 Alignment and configuration of terminations
Addition:
The end caps and the body of the fuse-link shall be in reasonable alignment.
Compliance is checked by means of the gauge shown in Figure 5.
The entire length of the fuse-link shall pass through the gauge by the fuse-link’s own weight.

– 16 – IEC 60127-2:2014 © IEC 2014
∅d
IEC
Tolerances of 0,01 mm.
Figure 5 – Alignment gauge (see 8.4)
9 Electrical requirements
Clause 9 of IEC 60127-1:2006 applies except as follows:
9.3 Breaking capacity
9.3.1 Operating conditions
Addition:
AC shall be used for this test.
A typical test circuit for the rated high-breaking capacity test is given in Figure 6, and for the
rated low-breaking capacity test, a typical test circuit is given in Figure 7. A test base
according to Figure 3 shall be used.
The power factor of the test circuit at rated high-breaking capacity shall be between 0,7
and 0,8. For tests at lower prospective currents, the inductance in the circuit shall remain
constant and the current shall be adjusted by changing only the resistance.
h
S D
R
C
A
R
F
L
IEC
Figure 6 – Typical test circuit for breaking-capacity tests for
high-breaking capacity fuse-links (see 9.3)
A
C
S D
R
F
IEC
Key for Figures 6 and7
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 the total impedance of the circuit
L Air-cored inductance of 0,30 mH ± 3 %
R Series resistor, adjusted to obtain correct prospective current
R Parallel resistor of 40 Ω ± 10 % acting as a damping resistor
Figure 7 – Typical test circuit for breaking-capacity tests for
low- and enhanced-breaking capacity fuse-links (see 9.3)
9.3.2 Criteria for satisfactory performance
Addition:
– fusing together of the contacts;
– illegibility of marking after test;
– piercing of the external surfaces of the end caps, visible to the naked eye.
The following phenomena are neglected:
– black spots on the end caps;
– small deformation of the end caps;
– cracking of the fuse-link.
Addition:
– 18 – IEC 60127-2:2014 © IEC 2014
10 Standard sheets
Standard
Fuse-links 5 mm × 20 mm
Quick-acting sheet 1
High-breaking capacity
Page 1
Dimensions in millimetres
20 ±0,5
5,1 ±0,6 5,1 ±0,6
IEC
Alignment: The dimensions of the gauge are as follows: h = 30 mm; d = 5,38 mm ± 0,01 mm (see 8.4).
Construction: The fuse-link shall be non-transparent.
a
Rated current Rated voltage Maximum
Maximum sustained
voltage drop
power dissipation
b
V mV W
50 mA 10 000
63 mA 8 800
80 mA 7 600
100 mA 7 000 1,6
125 mA 5 000
160 mA 4 300
200 mA 3 500
250 mA 2 800
315 mA 2 500
400 mA 2 000
500 mA 250 1 800 2,5
630 mA 1 500
800 mA 1 200
1 A 1 000
1,25 A 800
1,6 A 600
2 A 500
2,5 A 400
3,15 A 350
4 A 300
5 A 250
6,3 A 200
8 A 200
10 A 200
a
Intermediate values shall be chosen from the R 20 series according to ISO 3.
b
Measured after 1 h (for ratings above 6,3 A after 30 min) at 1,5 I .
N
Marking
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;
e) breaking capacity symbol H.

+0,1
Ø5,2 −0,2
Fuse-links 5 mm × 20 mm Standard
Quick-acting sheet 1
High-breaking capacity
Page 2
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
Maximum Minimum Maximum Minimum Maximum Maximum
50 mA to 4 A 30 min 10 ms 2 s 3 ms 300 ms 20 ms
Above 4 A to 6,3 A 30 min 10 ms 3 s 3 ms 300 ms 20 ms
Above 6,3 A to 10 A 30 min 40 ms 20 s 10 ms 1 s 30 ms
Breaking capacity
Rated breaking capacity: 1 500 A, tested with a.c. and using the circuit given in Figure 6 for the high-breaking capacity test.
Endurance test
100 cycles at 1,2 times the rated current according to 9.4 a) of IEC 60127-1, followed by 1 h (for ratings above 6,3 A 30 min) at
1,5 times the rated current according to 9.4 b) of IEC 60127-1.

– 20 – IEC 60127-2:2014 © IEC 2014
Fuse-links 5 mm × 20 mm Standard
Quick-acting sheet 2
Low-breaking capacity
Page 1
This type of fuse-link is recommended for the protection of circuits in telecommunication equipment or similar circuits with
limited short-circuit current.
Dimensions in millimetres
20 ±0,5
5,1 ±0,6 5,1 ±0,6
IEC
Alignment: The dimensions of the gauge are as follows: h = 30 mm; d = 5,38 mm ± 0,01 mm (see 8.4).
Construction: The fuse-link shall be transparent.
a
Rated current Rated voltage Maximum Maximum sustained
voltage drop power dissipation
b
V mV W
32 mA 10 000
40 mA 8 000
50 mA 7 000
63 mA 5 000
80 mA 4 000
100 mA 3 500
125 mA 2 000
160 mA 2 000
200 mA 1 700
250 mA 1 400
250 1,6
315 mA 1 300
400 mA 1 200
500 mA 1 000
630 mA 650
800 mA 240
1 A 200
1,25 A 200
1,6 A 190
2 A 170
2,5 A 170
3,15 A 150
4 A 130
2,5
5 A 130
6,3 A 130
8 A 130
125 4
10 A 130
a
Intermediate values shall be chosen from the R 20 series according to ISO 3.
b
Measured after 1 h (for ratings above 6,3 A after 30 min) at 1,5 I .
N
Marking
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;
e) breaking capacity symbol L.

+0,1
Ø5,2 −0,2
Fuse-links 5 mm × 20 mm Standard
Quick-acting sheet 2
Low-breaking capacity
Page 2
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
Maximum Minimum Maximum Minimum Maximum Maximum
32 mA to 100 mA 30 min 10 ms 500 ms 3 ms 100 ms 20 ms
Above 100 mA to 6,3 A 30 min 50 ms 2 s 10 ms 300 ms 20 ms
Above 6,3 A to 10 A 30 min 50 ms 2 s 10 ms 400 ms 40 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 7 for the low-
N
breaking capacity test.
For breaking capacity rated currents above 6,3 A shall be tested at 125 V.
Care should be taken that the prospective fault currents of the circuit are within these limits.
Endurance test
100 cycles at 1,2 times the rated current according to 9.4 a) of IEC 60127-1, followed by 1 h (for ratings above 6,3 A 30 min) at
1,5 times the rated current according to 9.4 b) of IEC 60127-1.

– 22 – IEC 60127-2:2014 © IEC 2014
Fuse-links 5 mm × 20 mm Standard
Time-lag (surge proof) sheet 3
Low-breaking capacity
Page 1
This type of fuse-link is recommended for the protection of circuits in telecommunication equipment or similar circuits with
limited short-circuit current.
Dimensions in millimetres
20 ±0,5
5,1 ±0,6 5,1 ±0,6
IEC
Alignment: The dimensions of the gauge are as follows: h = 30 mm; d = 5,38 mm ± 0,01 mm (see 8.4).
Construction: The fuse-link shall be transparent.
a
Rated current Rated voltage Maximum voltage Maximum
drop sustained power
dissipation
b
V mV W
32 mA 5 000
40 mA 4 000
50 mA 3 500
63 mA 3 000
80 mA 3 000
100 mA 2 500
125 mA 2 000
160 mA 1 900
200 mA 1 500
250 mA 1 300
315 mA 1 100
400 mA 1 000
250 900 1,6
500 mA
630 mA 250
800 mA 150
1 A 150
1,25 A 150
1,6 A 150
2 A 120
2,5 A 100
3,15 A 100
4 A 100
5 A
6,3 A
8 A 100
125 4
10 A 100
a
Intermediate values shall be chosen from the R 20 series according to ISO 3.
b
Measured after 1 h (for ratings above 6,3 A after 30 min) at 1,5 I .
N
Marking
Fuse-links shall be marked with the following:
a) rated current;
b) rated voltage;
c) manufacturer's name or trade mark;
d) characteristic symbol T;
e) breaking capacity symbol L.
+0,1
Ø5,2 −0,2
Standard
Fuse-links 5 mm × 20 mm
sheet 3
Time-lag (surge-proof)
Low-breaking capacity
Page 2
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
Maximum Minimum Maximum Minimum Maximum Minimum Maximum
32 mA to 100 mA 2 min 200 ms 10 s 40 ms 3 s 10 ms 300 ms
Above 100 mA 2 min 600 ms 10 s 150 ms 3 s 20 ms 300 ms
to 10 A
Test at a temperature of (70 ± 2) °C
A current of 1,1 I shall be passed through the fuse-links for 1 h and they shall not operate.
N
Breaking capacity
Rated breaking capacity: 35 A or 10 I , whichever is greater, tested with a.c. and using the circuit given in Figure 7 for the low-
N
breaking capacity test.
For breaking capacity rated currents above 6,3 A shall be tested at 125 V.
Care should be taken that the prospective fault currents of the circuit are within these limits.
Endurance test
100 cycles at 1,2 times the rated current according to 9.4 a) of IEC 60127-1, followed by 1 h (for ratings above 6,3 A 30 min) at
1,5 times the rated current according to 9.4 b) of IEC 60127-1.

– 24 – IEC 60127-2:2014 © IEC 2014

Fuse-links 6,3 mm × 32 mm Standard
Quick-acting Sheet 4
Low-breaking capacity
Page 1
This type of fuse-link is recommended for the protection of circuits in telecommunication equipment or similar circuits with
limited short-circuit current.
NOTE This sheet is issued on the basis of actual needs in several countries. Modifications may be necessary for future use in
more countries.
Dimensions in millimetres
31,8 ±0,8
6,2 ±0,6 6,2 ±0,6
IEC
Alignment: The dimensions of the gauge are: h = 38 mm; d = 6,65 mm ± 0,01 mm (see 8.4).
Construction: The fuse-link shall be transparent.
Rated current Rated voltage Maximum Maximum
voltage drop sustained power
dissipation
V mV W*
50 mA 10 000
63 mA 8 000
80 mA 7 000
100 mA 6 000
125 mA 5 500
160 mA 5 000
200 mA 4 000
1,6
250 mA 3 500
315 mA 3 000
400 mA 2 500
500 mA 2 000
630 mA 1 800
800 mA 1 500
1 A 500
1,25 A 400
1,6 A 400
2,5
2 A 300
2,5 A 150 250
3,15 A 150 250
4 A 150 250
5 A 60 200
6,3 A 60 200
8 A 60 200
10 A 60 200
* Measured after 1 h at 1,15 I .
N
Marking
Fuse-links shall be marked with:
a) rated current;
b) rated voltage;
c) manufacturer´s name or trade mark;
d) characteristic symbol F;
e) breaking capacity symbol L.
Pre-arcing time/current characteristic

Ø6,35 ±0,1
Standard
Fuse-links 6,3 mm × 32 mm
Quick-acting Sheet 4
Low-breaking capacity
Page 2
The pre-arcing time shall be within the following limits:
Rated current 2 I 2,75 I 4 I 10 I
N N N N
Maximum Minimum Maximum Minimum Maximum Maximum
50 mA to 100 mA 20 s 2 ms 200 ms 1 ms 30 ms 5 ms
inclusive
Above 100 mA to 10 A 20 s 20 ms 1 500 ms 8 ms 400 ms 80 ms

Breaking capacity
Rated breaking capacity: 35 A or 10 I whichever is greater, tested with a.c. and using the circuit given in
N
Figure 7, for the low-breaking capacity test.
Endurance test
100 cycles at 1,05 times the rated current according to 9.4 a) of IEC 60127-1, followed by 1 h 1,15 times the
rated current according to 9.4 b) of IEC 60127-1.

– 26 – IEC 60127-2:2014 © IEC 2014
Fuse-links 5 mm × 20 mm Standard
Time-lag (surge-proof) sheet 5
High-breaking capacity
Page 1
Dimensions in millimetres
20 ±0,5
5,1 ±0,6 5,1 ±0,6
IEC
Alignment: The dimensions of the gauge are as follows: h = 30 mm; d = 5,38 mm ± 0,01 mm (see 8.4).
Construction: The fuse-link shall be non-transparent.
a
Rated current Rated voltage Maximum Maximum
voltage drop sustained
power dissipation
b
V mV W
100 mA 2 800
125 mA 2 600
160 mA 2 400
200 mA 2 100
250 mA 1 500
1,6
315 mA 1 100
400 mA 1 000
500 mA 850
630 mA 650
800 mA 500
1 A 350
1,25 A 300
1,6 A 200 2,5
2 A 190
2,5 A 180
3,15 A 140
4 A 100
5 A 100
6,3 A 100
8 A 100
10 A 100
a
Intermediate values shall be chosen from the R 20 series according to ISO 3.
b
Measured after 1 h (for ratings above 6,3 A after 30 min) at 1,5 I .
N
Marking
Fuse-links shall be marked with the following:
a) rated current;
b) rated voltage;
c) manufacturer's name or trade mark;
d) characteristic symbol T;
e) breaking capacity symbol H.

Standard
Fuse-links 5 mm × 20 mm
sheet 5
Time-lag (surge-proof)
High-breaking capacity
Page 2
Pre-arcing time/current characteristic
The pre-arcing time shall be within the following limits:
+0,1
Ø5,2 −0,2
Rated current 2,1 I 2,75 I 4 I 10 I
N N N N
Maximum Minimum Maximum Minimum Maximum Minimum Maximum
100 mA to 800 mA 30 min 250 ms 80 s 50 ms 5 s 5 ms 150 ms
Above 800 mA to 3,15 A 30 min 750 ms 80 s 95 ms 5 s 10 ms 150 ms
Above 3,15 A to 10 A 30 min 750 ms 80 s 150 ms 5 s 10 ms 150 ms
Test at a temperature of (70 ± 2) °C
A current of 1,1 I shall be passed through the fuse-links for 1 h and they shall not operate.
N
Breaking capacity
Rated breaking capacity: 1 500 A, tested with a.c. and using the circuit given in Figure 6 for the high-breaking
capacity test.
Endurance test
100 cycles at 1,2 times the rated current according to 9.4 a) of IEC 60127-1, followed by 1 h (for ratings above
6,3 A 30 min) at 1,5 times the rated current according to 9.4 b) of IEC 60127-1.

– 28 – IEC 60127-2:2014 © IEC 2014
Fuse-links 5 mm × 20 mm Standard
Time-lag (surge proof) sheet 6
Enhanced breaking capacity
Page 1
This type of fuse-link is recommended for the protection of circuits in equipment such as television sets having a
prospective short-circuit current above 35 A, but not exceeding 150 A.
Dimensions in millimetres
20 ±0,5
5,1 ±0,6 5,1 ±0,6
IEC
Alignment: The dimensions of the gauge are as follows: h = 30 mm; d = 5,38 mm ± 0,01 mm (see 8.4).
Construction: The fuse-link may
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