IEC 60127-6:2023
(Main)Miniature fuses - Part 6: Fuse-holders for miniature fuse-links
Miniature fuses - Part 6: Fuse-holders for miniature fuse-links
IEC 60127-6:2023 is applicable to fuse-holders for miniature cartridge fuse-links according to IEC 60127-2, sub-miniature fuse-links according to IEC 60127-3, universal modular fuse-links to IEC 60127-4 and miniature fuse-links for special applications to IEC 60127-7 for the protection of electric appliances, electronic equipment and component parts thereof, normally intended for use indoors.
NOTE Requirements for fuse-holders for miniature fuse-links complying with IEC 60127-4 and IEC 60127-7 are under consideration. It does not apply to fuse holders for fuses completely covered by the subsequent parts of IEC 60269-1.
Coupe-circuit miniatures - Partie 6: Ensembles-porteurs pour cartouches de coupe-circuits miniatures
L'IEC 60127-6:2023 s'applique aux ensembles-porteurs pour éléments de remplacement à cartouches conformes à l'IEC 60127-2, aux éléments de remplacement subminiatures conformes à l'IEC 60127-3, aux éléments de remplacement modulaires universels conformes à l’IEC 60127-4 et aux éléments de remplacement miniatures pour applications spéciales conformes à l’IEC 60127-7 pour la protection d’appareils électriques, de matériels électroniques et de leurs éléments constituants, normalement destinés à être utilisés à l’intérieur de bâtiments.
NOTE Les exigences relatives aux ensembles-porteurs pour éléments de remplacement miniatures conformes à l’IEC 60127-4 et à IEC 60127-7 sont à l’étude. La présente partie de l’IEC 60269-1 ne s’applique pas aux ensembles-porteurs pour coupe-circuit à fusibles, traités par les parties suivantes de l’IEC 60269-1.
General Information
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Standards Content (Sample)
IEC 60127-6 ®
Edition 3.0 2023-10
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Miniature fuses –
Part 6: Fuse-holders for miniature fuse-links
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IEC 60127-6 ®
Edition 3.0 2023-10
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Miniature fuses –
Part 6: Fuse-holders for miniature fuse-links
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.120.50 ISBN 978-2-8322-7754-6
– 2 – IEC 60127-6:2023 RLV © IEC 2023
CONTENTS
FOREWORD . 6
INTRODUCTION . 8
1 Scope . 9
2 Normative references . 9
3 Terms and definitions . 11
4 General requirements . 15
5 Preferred standard ratings and classifications for fuse-holders . 17
6 Marking . 17
7 Clause deleted .
7 General notes on tests . 18
7.1 Nature of tests . 18
7.2 Standard atmospheric conditions for measurement and tests . 18
7.3 Preconditioning of test samples . 18
7.4 Nature of supply . 18
7.5 Gauges and dummy fuse-links for tests . 18
7.5.1 Gauges and dummy fuse-links according to IEC 60127-2 . 18
7.5.2 Gauges and dummy fuse-links according to IEC 60127-3 . 20
8.6 Type tests .
8 Protection against electric shock . 23
8.1 Category PC1: Fuse-holders without integral protection against electric
shock . 23
8.2 Category PC2: Fuse-holders with integral protection against electric shock . 23
8.3 Category PC3: Fuse-holders with enhanced integral protection against
electric shock . 24
9 Clearances and creepage distances . 24
9.1 General . 24
9.2 Minimum requirements for fuse-holders in respect to the grade of insulation . 24
9.3 Clearances . 25
9.4 Creepage distances . 27
10 Electrical requirements . 28
10.1 Insulation resistance, dielectric strength and impulse withstand voltage . 28
10.1.1 Mounting . 28
10.1.2 Humidity preconditioning . 29
10.1.3 Measurement of insulation resistance . 30
10.1.4 Dielectric strength test . 30
10.1.5 Impulse withstand voltage test . 30
10.2 Contact resistance . 31
10.2.1 General measuring requirements . 31
10.2.2 Measuring cycle. 31
11 Mechanical requirements . 34
11.1 General . 34
11.2 Mounting . 34
11.3 Compatibility between fuse-holder and fuse-link . 34
11.4 Mechanical strength of the connection between fuse-base and fuse-carrier . 35
11.4.1 Screw and bayonet connections . 35
11.4.2 Plug-in connection . 35
11.5 Impact test . 36
11.6 Mechanical strength of the fuse-holder fastening on panels . 36
11.6.1 Fixing nut fastening . 36
11.6.2 Fixing screw fastening . 36
11.6.3 Snap-in fastening . 37
11.7 Terminals of fuse-bases . 38
11.7.1 Terminals with screw-type clamping or screwless-type clamping . 38
11.7.2 Terminals for soldering . 38
11.8 Resistance to vibration . 41
11.8.1 General . 41
11.8.2 Mounting . 42
11.8.3 Measurement and requirements . 42
12 Thermal requirements . 42
12.1 Rated power acceptance test . 42
12.1.1 General . 42
12.1.2 Mounting . 43
12.1.3 Dummy fuse-links . 45
12.1.4 Measurement of maximum allowable temperatures on fuse-holders . 48
12.1.5 Correlation between ambient air temperature T and the power
A1
acceptance of a fuse-holder . 52
12.1.6 Temperature measuring point for ambient air temperature T . 52
A1
12.1.7 Test method . 52
12.2 Resistance to abnormal heat and fire . 53
12.2.1 Needle-flame test . 53
12.2.2 Glow-wire ignition test . 54
13 Endurance . 54
13.1 General . 54
13.2 Endurance test. 54
13.3 Requirements . 54
14 Additional requirements . 55
14.1 Resistance to rusting . 55
14.2 Resistance to cleaning solvents . 55
Annex A (normative) Test PC board for fuse-holders of rated currents up to 10 25 A . 56
Annex B (normative) Type tests, test sequences and number of samples . 59
Annex C (informative) Insulation coordination . 61
C.1 Overvoltage categories . 61
C.2 Degrees of pollution in the micro-environment . 61
C.3 Comparative tracking index CTI . 62
Annex D (informative) Additional tests and requirements . 63
D.1 General . 63
D.2 Resistance to shock . 63
D.2.1 General . 63
D.2.2 Mounting . 63
D.2.3 Measurement and requirements . 63
D.3 Verification of the degree of protection of enclosures . 63
D.4 Climatic category . 64
D.4.1 General . 64
D.4.2 Test conditions and requirements . 64
– 4 – IEC 60127-6:2023 RLV © IEC 2023
Annex E (informative normative) Information for the correct application of the fuse-
holder . 65
Bibliography . 66
Figure 1 – Outline of gauges and dummy fuse-links according to IEC 60127-2. 19
Figure 2 – Outline of gauges and dummy fuse-links according to IEC 60127-3:2015,
standard sheet 1 . 21
Figure 3 – Outline of gauges and dummy fuse-links according to IEC 60127-3:2015,
standard sheets 3 and 4 . 22
Figure 4 – Panel mounting . 29
Figure 5 – PC board mounting . 29
Figure 6 – Test device for mechanical test . 34
Figure 7 – Examples of snap-in fastening fuse-holder fastening on panels . 37
Figure 8 – Tensile force test . 41
Figure 9 – Compressive force test . 41
Figure 10 – Example of test device . 44
Figure 11 – IEC 60127-3:2015, Standard sheet 1 . 47
Figure 12 – IEC 60127-3:2015, Standard sheets 3 and 4 . 47
Figure 13 – Illustration of temperatures experienced in practice . 50
Figure 14 – Example of a derating curve . 53
Figure A.1 – Example of a test board . 57
Table 1 – Features of unexposed or exposed fuse-holders . 16
Table 2 – Values for standard preferred ratings and classifications . 17
Table 3 – Dimensions and materials for gauges according to IEC 60127-2 . 20
Table 4 – Dimensions and materials for dummy fuse-links according to IEC 60127-2 .
Table 4 – Dimensions and materials for gauges according to IEC 60127-3 . 23
Table 5 – Types of insulation between different live parts and accessible parts . 24
Table 6 – Dimensions and materials for dummy fuse-links according to IEC 60127-3 .
Table 6 – Required impulse withstand voltage for clearances . 25
Table 9 – Overvoltage category II .
Table 10 – Overvoltage category III .
Table 7 – Minimum clearances in air under overvoltage category II II. 26
Table 8 – Minimum clearances in air under overvoltage category II . 27
Table 9 – Minimum creepage distances in millimetres for a microenvironment-
dependent on rated voltage, pollution degree, insulating material, corresponding to
IEC 60664-1:20072020, Table F.45 . 27
Table 10 – Values for insulation resistance, dielectric strength and impulse withstand
voltage . 33
Table 11 – Values for torque and axial pull . 35
Table 12 – Torque values . 36
Table 13 – Torque values . 37
Table 14 – Mounting groups . 38
Table 15 – Cross-sections of conductors . 39
Table 16 – Tensile and compressive forces . 41
Table 17 – Dimensions and materials for dummy fuse-link according to IEC 60127-2 . 45
Table 18 – Dummy fuse-links according to IEC 60127-2 . 46
Table 19 – Dimensions and materials for dummy fuse-links according to IEC 60127-3 . 47
Table 20 – Dummy fuse-links according to IEC 60127-3 . 48
Table 21 – Maximum allowable temperatures . 51
Table A.1 – Copper layer for test board . 58
Table B.1 – Type tests, test sequences and number of samples . 60
Table D.1 – Examples of climatic categories . 64
Table E.1 – Information for the correct application of the fuse-holder . 65
– 6 – IEC 60127-6:2023 RLV © IEC 2023
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MINIATURE FUSES –
Part 6: Fuse-holders for 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
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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
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3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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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
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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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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) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
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shall not be held responsible for identifying any or all such patent rights.
This redline version of the official IEC Standard allows the user to identify the changes
made to the previous edition IEC 60127-6:2014. A vertical bar appears in the margin
wherever a change has been made. Additions are in green text, deletions are in
strikethrough red text.
IEC 60127-6 has been prepared by subcommittee 32C: Miniature fuses, of IEC technical
committee 32: Fuses. It is an International Standard.
This third edition cancels and replaces the second edition published in 2014. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) enhanced maximum rated current from 16 A to 25 A in Clause 1;
b) adding of IEC 60127-4 and IEC 60127-7 in Clause 1;
c) modification of marking position in Clause 6;
d) modification of rated voltage, rated current and rated power acceptance in Table 2;
e) modification of Table 5, Table 6, Table 7, Table 9, Table 16 and Table A.1.
The text of this International Standard is based on the following documents:
Draft Report on voting
32C/620/FDIS 32C/623/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/standardsdev/publications.
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 document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
IMPORTANT – The "colour inside" logo on the cover page of this document 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.
– 8 – IEC 60127-6:2023 RLV © IEC 2023
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.
To this day, the IEC 60127 series, is thus subdivided as follows:
IEC 60127-1, Miniature fuses – Part 1: Definitions for miniature fuses and general requirements
for miniature fuse-links
IEC 60127-2, Miniature fuses – Part 2: Cartridge fuse-links
IEC 60127-3, Miniature fuses Part 3: Sub-miniature fuse-links
IEC 60127-4, Miniature fuses – Part 4: Universal modular fuse-links (UMF) – Through-hole and
surface mount types
IEC 60127-5, Miniature fuses – Part 5: Guidelines for quality assessment of miniature fuse-links
IEC 60127-6, Miniature fuses – Part 6: Fuse-holders for miniature cartridge fuse-links
IEC 60127-7, Miniature fuses – Part 7: Miniature fuse-links for special applications
IEC 60127-8 (free for further documents)
IEC 60127-8, Miniature fuses – Part 8: Fuse resistors with particular overcurrent protection
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 requirements, test equipment and test methods for fuse-holders.
It is a self-standing document, which refers back to IEC 60127-1 with regard to certain
definitions and the atmospheric conditions for test. It also makes reference to other parts of the
IEC 60127 series with regard to dimensions and maximum power losses of fuse-links.
MINIATURE FUSES –
Part 6: Fuse-holders for miniature fuse-links
1 Scope
This part of IEC 60127 is applicable to fuse-holders for miniature cartridge fuse-links according
to IEC 60127-2, sub-miniature fuse-links according to IEC 60127-3, universal modular fuse-
links to IEC 60127-4 and miniature fuse-links for special applications to IEC 60127-7 for the
protection of electric appliances, electronic equipment and component parts thereof, normally
intended for use indoors.
NOTE Requirements for fuse-holders for miniature fuse-links complying with IEC 60127-4 and IEC 60127-7 are
under consideration.
It does not apply to fuse holders for fuses completely covered by the subsequent parts of
IEC 60269-1.
This document applies to fuse-holders with:
– a maximum rated current of 16 25 A and
– a maximum rated voltage of 1 500 V DC or 1 000 V AC; and
– for use up to 2 000 m above sea-level, unless otherwise specified.
The object of this document is to establish uniform requirements for safety and the assessment
of electrical, mechanical, thermal and climatic properties of fuse-holders and the compatibility
between fuse-holders and fuse-links.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies.
For undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60050 (all parts), International Electrotechnical Vocabulary
IEC 60050-441, International Electrotechnical Vocabulary (IEV) – Part 441: Switchgear,
controlgear and fuses
IEC 60050-581, International Electrotechnical Vocabulary (IEV) – Part 581: Electromechanical
components for electronic equipment
IEC 60068-1:2013, Environmental testing – Part 1: General and guidance
IEC 60068-2-1:2007, Environmental testing - Part 2-1: Tests - Test A: Cold
IEC 60068-2-2:2007, Environmental testing - Part 2-2: Tests - Test B: Dry heat
IEC 60068-2-6:2007, Environmental testing – Part 2-6: Tests – Test Fc: Vibration (sinusoidal)
IEC 60068-2-20:20082021, Environmental testing – Part 2-20: Tests – Test T Tests Ta and Tb:
Test methods for solderability and resistance to soldering heat of devices with leads
– 10 – IEC 60127-6:2023 RLV © IEC 2023
IEC 60068-2-21:2006, Environmental testing – Part 2-21: Tests – Test U: Robustness of
terminations and integral mounting devices
IEC 60068-2-27:2008, Environmental testing – Part 2-27: Tests – Test Ea and guidance: Shock
IEC 60068-2-45:1980, Basic environmental testing procedures – Part 2-45: Tests – Test XA
and guidance: Immersion in cleaning solvents
IEC 60068-2-45:1980/AMD1:1993
IEC 60068-2-47:2005, Environmental testing – Part 2-47: Test – Mounting of specimens for
vibration, impact and similar dynamic tests
IEC 60068-2-75:1997, Environmental testing – Part 2-75: Tests – Test Eh: Hammer tests
IEC 60068-2-78:2012, Environmental testing - Part 2-78: Tests - Test Cab: Damp heat, steady
state
IEC 60068-3-4:2001, Environmental testing - Part 3-4: Supporting documentation and guidance
- Damp heat tests
IEC 60112:2003, Method for the determination of the proof and the comparative tracking indices
of solid insulating materials
IEC 60112:2003/AMD1:2009
IEC 60127-1 :2006, Miniature fuses – Part 1: Definitions for miniature fuses and general
requirements for miniature fuse-links
IEC 60127-1:2006/AMD1:2011
IEC 60127-1:2006/AMD2:2015
IEC 60127-2:2003, Miniature fuses - Part 2: Cartridge fuse-links
IEC 60127-2:2003/AMD1:2003
IEC 60127-2:2003/AMD2:2010
IEC 60127-3:19882015, Miniature fuses - Part 3: Sub-miniature fuse-links
IEC 60127-3:1988/AMD1:1991
IEC 60127-3:1988/AMD2:2002
IEC 60216-1:2013, Electrical insulating materials – Thermal endurance properties – Part 1:
Ageing procedures and evaluation of test results
IEC 60529:1989, Degrees of protection provided by enclosures (IP Code)
IEC 60529:1989/AMD1:1999
IEC 60529:1989/AMD2:2013
IEC 60664-1:20072020, Insulation coordination for equipment within low-voltage supply
systems – Part 1: Principles, requirements and tests
IEC 60695-4:2012, Fire hazard testing – Part 4: Terminology concerning fire tests for
electrotechnical products
___________
A consolidated version of this publication exists, comprising IEC 60127-1:2006, IEC 60127-1:2006/AMD 1:2011
and IEC 60127-1:2006/AMD 2:2015.
IEC 60695-2-12:20102021, Fire hazard testing – Part 2-12: Glowing/hot-wire based test
methods – Glow-wire flammability index (GWFI) test method for materials
IEC 60695-2-12:2010/AMD1:2014
IEC 60695-2-13:20102021, Fire hazard testing – Part 2-13: Glowing/hot-wire based test
methods – Glow-wire ignition temperature (GWIT) test method for materials
IEC 60695-2-13:2010/AMD1:2014
IEC 60695-11-5:20042016, Fire hazard testing - Part 11-5: Test flames - Needle-flame test
method - Apparatus, confirmatory test arrangement and guidance
IEC 60999-1:1999, Connecting devices – Electrical copper conductors – Safety requirements
for screw-type and screwless-type clamping units – Part 1: General requirements and particular
2 2
requirements for clamping units for conductors from 0,2 mm up to 35 mm (included)
IEC 61140:2001, Protection against electric shock - Common aspects for installation and
equipment
IEC 61140:2001/AMD1:2004
IEC 61210:2010, Connecting devices – Flat quick-connect terminations for electrical copper
conductors – Safety requirements
ISO 3:1973, Preferred numbers – Series of preferred numbers
3 Terms and definitions
For the definitions of general terms used in this standard, reference should be made to
IEC 60050-441, IEC 60050-581 and IEC 60664-1.
For definitions of terms relating to fuse-links, reference is made to IEC 60127-1:2006.
For the purposes of this document, the following terms and definitions apply.
For the purposes of this document, the terms and definitions given in IEC 60050-441,
IEC 60050-581, IEC 60127-1 and the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
fuse-holder
combination of a fuse-base with its fuse-carrier
Note 1 to entry: In some fuse-holder constructions where the fuse-base and the fuse-carrier are not separate parts
the fuse-holder may consist of only the fuse-base and no fuse-carrier.
3.1.1
fuse-base
fuse-mount
fixed part of a fuse provided with contacts and terminals for connection to the system
[SOURCE: IEC 60127-1:2006, 3.10]
– 12 – IEC 60127-6:2023 RLV © IEC 2023
3.1.2
fuse-carrier
movable part of a fuse designed to carry a fuse-link
[SOURCE: IEC 60127-1:2006, 3.12]
3.1.3
unexposed fuse-holder
fuse-holder with enclosed contacts
3.1.4
exposed fuse-holder
fuse-holder with exposed contacts
EXAMPLE Clips.
3.2
rating
characteristic values that together define the working conditions upon which the tests are based
and for which the fuse-holder is designed
EXAMPLE Examples of rated values usually stated for fuses fuse-holders are:
− voltage (U );
N
− current (I );
N
– breaking capacity.
− power acceptance.
[SOURCE: IEC 60127-1:2006, 3.16]
3.3
rated power acceptance
value of power acceptance of a fuse-holder assigned by the manufacturer
Note 1 to entry: This value is the maximum power dissipation produced by the inserted dummy fuse-link during
testing, at the rated current tolerated by the fuse-holder without exceeding the specified temperatures.
Note 2 to entry: The rated power acceptance is referred to an ambient temperature of 23 °C.
3.4
rated current
value of current of a fuse-holder assigned by the manufacturer and to which the rated power
acceptance is referred
3.5
rated voltage
value of voltage of a fuse-holder assigned by the manufacturer and to which operation and
performance characteristics are referred
3.6
insulation coordination
mutual correlation of insulation characteristics of electrical equipment taking into account the
expected micro-environment and other influencing stresses
[SOURCE: IEC 60664-1:20072020, 3.1.3, modified – Note 1 to entry has been removed.]
3.7
impulse withstand voltage
highest peak value of impulse voltage of prescribed specified form and polarity which does not
cause breakdown of insulation under specified conditions
[SOURCE: IEC 60664-1:20072020, 3.1.15]
3.8
overvoltage category
numeral defining a transient overvoltage condition
Note 1 to entry: Specified categories, see Clause C.1.
[SOURCE: IEC 60664-1:20072020, 3.10, modified by addition of “specified categories” 3.1.20,
modified – Note 1 to entry “Overvoltage categories I, II, III and IV are used, see 4.3.2” has been
entirely reworded.]
3.9
pollution
any addition of foreign matter, solid, liquid, or gaseous that can result in a reduction of electric
strength or surface resistivity of the insulation
any condition of foreign matter, solid, liquid, or gaseous (ionized
gases), that can affect dielectric strength or surface resistivity
[SOURCE: IEC 60664-1:20072020, 3.1.24]
3.10
pollution degree
numeral characterizing the expected pollution of the micro-environment
specified degrees, see C.2
Note 1 to entry: see Clause C.2.
[SOURCE: IEC 60664-1:20072020, 3.13, modified by addition of “specified categories” 3.1.25,
modified – Note 1 to entry has been added]
3.11
micro-environment
immediate environment of the insulation which particularly influences the dimensioning of the
creepage distances
ambient conditions which immediately influences the dimensioning of
the clearance and creepage distances
[SOURCE: IEC 60664-1:20072020, 3.1.23]
3.12
clearance
shortest distance in air between two conductive parts
[SOURCE: IEC 60664-1:20072020, 3.1.4]
3.13
creepage distance
shortest distance along the surface of a solid insulating material between two conductive parts
[SOURCE: IEC 60050-151:2001, 151-15-50]
3.14
solid insulation
solid insulating material or a combination of solid insulating material, interposed placed between
two conductive parts or between a conductive part and a body part
– 14 – IEC 60127-6:2023 RLV © IEC 2023
[SOURCE: IEC 60664-1:20072020, 3.1.6]
3.15
comparative tracking index
CTI
numerical value of the maximum voltage in volts which a material can withstand without tracking
and without a persistent flame occurring under specified test conditions
Note 1 to entry: The test for comparative tracking index in accordance with IEC 60112 is designed to compare the
performance of various insulating materials under test conditions, namely drops of an aqueous contaminant falling
on a horizontal surface leading to electrolytic conduction material groups and their CTI values, see Clause C.3.
[SOURCE: IEC 60050-212:2010, 212-11-59, modified – The Note to entry has been added.]
3.16
live part
conductor or conductive part intended to be energized in normal operation, including a neutral
conductor, but by convention, not a PEN conductor or PEM conductor or PEL conductor
Note 1 to entry: This concept does not necessarily imply a risk of electric shock.
[SOURCE: IEC 60050-826:20042022, 826-12-08, modified – The domain “
installations and equipment> has been deleted, the definition has been reworded and the note
to entry has been added.]
3.17
fuse-holder electric shock protection categories
designation characterizing the level of the protection against electric shock of a fuse-holder
3.18
maximum allowable ambient air temperature
highest air temperature, in the immediate vicinity, that a fuse-holder can endure at a power
acceptance assigned by the manufacturer of the fuse-holder without exceeding the maximum
allowable temperatures on the accessible and inaccessible surfaces of the fuse-holder
3.19
relative temperature index
based on IEC 60216-1, temperature index of a test material obtained from the time which
corresponds to the known temperature index of a reference material when both materials are
subjected to the same ageing and diagnostic procedures in comparative test
3.20
insulation
part of an electrotechnical product which separates the conducting parts at different electrical
potentials during operation or insulates such parts from the surroundings
Note 1 to entry: For detailed information, see IEC 61140 and IEC 60664-1.
[SOURCE: IEC 60050-212:2010, 212-01-05 212-11-07, modified – The term “electric insulation”
has been replaced by “insulation”.]
3.20.1
functional insulation
insulation between conductive parts which is necessary only for the proper functioning of the
equipment
[SOURCE: IEC 60664-1:20072020, 3.1.29]
3.20.2
basic insulation
insulation of hazardous-live-parts which provides basic protection
Note 1 to entry: The concept does not apply to insulation used exclusively for functional purposes.
[SOURCE: IEC 60050-826:20042022, 826-12-14, modified – In the definition, the term
“insulation” has been replaced by “insulation of hazardous-live-parts”.]
3.20.3
supplementary insulation
independent insulation applied in addition to basic insulation for fault protection
[SOURCE: IEC 60050-826:20042022, 826-12-15]
3.20.4
double insulation
insulation comprising both basic insulation and supplementary insulation
[SOURCE: IEC 60050-826:20042022, 826-12-16]
3.20.5
reinforced insulation
insulation of hazardous-live-parts which provides a degree of protection against electric shock
equivalent to double insulation
Note 1 to entry: Reinforced insulation may can comprise several layers which cannot be tested singly as basic
insulation or supplementary insulation.
[SOURCE: IEC 60050-826:20042022, 826-12-17, modified – In the definition, the term
“insulation” has been replaced by “insulation of hazardous-live-parts”.]
3.21
inaccessible part
(inaccessible surface)
part or surface inside the equipment which cannot be touched by means of the standard test
finger according to IEC 60529
3.22
accessible part
accessible surface
part or surface which can be touched by means of the standard test finger according to
IEC 60529, when the fuse-holder is installed and operated as in normal use, e.g. on the front
panel of equipment
3.23
gauge
test fuse-link without a melting element
4 General requirements
Fuse-holders shall be so designed and constructed that in normal use, installed according to
the manufacturer’s instructions, their performance is reliable and without danger to the user or
surroundings.
In general, compliance is checked by carrying out all of the relevant tests specified.
– 16 – IEC 60127-6:2023 RLV © IEC 2023
Additional tests and requirements may be added in accordance with the manufacturer's
declaration, as shown in Annex D.
Examples of fuse-holder types with different features are given in Table 1.
Table 1 – Features of unexposed or exposed fuse-holders
No. description
1 Types of mounting:
– Panel and base mounting
– Printed circuit board mounting
Methods of fastening:
– Methods of fastening on panel:
• Fixing nut fastening (threaded nut)
• Snap-in fastening:
a) Fuse-base with an integral spring system
b) Fuse-base with a separate spring-nut (a nut fabricated, e.g. from thin spring steel having an
impression designed to accommodate the mating part)
– Methods of fastening on printed circuit (PC) board:
• Solder fasteni
...
IEC 60127-6 ®
Edition 3.0 2023-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Miniature fuses –
Part 6: Fuse-holders for miniature fuse-links
Coupe-circuit miniatures –
Partie 6: Ensembles-porteurs pour cartouches de coupe-circuits miniatures
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IEC 60127-6 ®
Edition 3.0 2023-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Miniature fuses –
Part 6: Fuse-holders for miniature fuse-links
Coupe-circuit miniatures –
Partie 6: Ensembles-porteurs pour cartouches de coupe-circuits miniatures
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.120.50 ISBN 978-2-8322-7651-8
– 2 – IEC 60127-6:2023 © IEC 2023
CONTENTS
FOREWORD . 6
INTRODUCTION . 8
1 Scope . 9
2 Normative references . 9
3 Terms and definitions . 11
4 General requirements . 15
5 Preferred ratings and classifications for fuse-holders . 16
6 Marking . 16
7 General notes on tests . 17
7.1 Nature of tests . 17
7.2 Standard atmospheric conditions for measurement and tests . 17
7.3 Preconditioning of test samples . 17
7.4 Nature of supply . 17
7.5 Gauges for tests . 17
7.5.1 Gauges according to IEC 60127-2 . 17
7.5.2 Gauges according to IEC 60127-3 . 19
8 Protection against electric shock . 20
8.1 Category PC1: Fuse-holders without integral protection against electric
shock . 20
8.2 Category PC2: Fuse-holders with integral protection against electric shock . 20
8.3 Category PC3: Fuse-holders with enhanced integral protection against
electric shock . 20
9 Clearances and creepage distances . 21
9.1 General . 21
9.2 Minimum requirements for fuse-holders in respect to the grade of insulation . 21
9.3 Clearances . 21
9.4 Creepage distances . 23
10 Electrical requirements . 24
10.1 Insulation resistance, dielectric strength and impulse withstand voltage . 24
10.1.1 Mounting . 24
10.1.2 Humidity preconditioning . 24
10.1.3 Measurement of insulation resistance . 25
10.1.4 Dielectric strength test . 25
10.1.5 Impulse withstand voltage test . 25
10.2 Contact resistance . 26
10.2.1 General measuring requirements . 26
10.2.2 Measuring cycle. 26
11 Mechanical requirements . 29
11.1 General . 29
11.2 Mounting . 29
11.3 Compatibility between fuse-holder and fuse-link . 29
11.4 Mechanical strength of the connection between fuse-base and fuse-carrier . 30
11.4.1 Screw and bayonet connections . 30
11.4.2 Plug-in connection . 30
11.5 Impact test . 31
11.6 Mechanical strength of the fuse-holder fastening on panels . 31
11.6.1 Fixing nut fastening . 31
11.6.2 Fixing screw fastening . 31
11.6.3 Snap-in fastening . 32
11.7 Terminals of fuse-bases . 33
11.7.1 Terminals with screw-type clamping or screwless-type clamping . 33
11.7.2 Terminals for soldering . 33
11.8 Resistance to vibration . 36
11.8.1 General . 36
11.8.2 Mounting . 36
11.8.3 Measurement and requirements . 37
12 Thermal requirements . 37
12.1 Rated power acceptance test . 37
12.1.1 General . 37
12.1.2 Mounting . 37
12.1.3 Dummy fuse-links . 38
12.1.4 Measurement of maximum allowable temperatures on fuse-holders . 42
12.1.5 Correlation between ambient air temperature T and the power
A1
acceptance of a fuse-holder . 44
12.1.6 Temperature measuring point for ambient air temperature T . 45
A1
12.1.7 Test method . 45
12.2 Resistance to abnormal heat and fire . 46
12.2.1 Needle-flame test . 46
12.2.2 Glow-wire ignition test . 47
13 Endurance . 47
13.1 General . 47
13.2 Endurance test. 47
13.3 Requirements . 47
14 Additional requirements . 48
14.1 Resistance to rusting . 48
14.2 Resistance to cleaning solvents . 48
Annex A (normative) Test PC board for fuse-holders of rated currents up to 25 A . 49
Annex B (normative) Type tests, test sequences and number of samples . 50
Annex C (informative) Insulation coordination . 51
C.1 Overvoltage categories . 51
C.2 Degrees of pollution in the micro-environment . 51
C.3 Comparative tracking index CTI . 52
Annex D (informative) Additional tests and requirements . 53
D.1 General . 53
D.2 Resistance to shock . 53
D.2.1 General . 53
D.2.2 Mounting . 53
D.2.3 Measurement and requirements . 53
D.3 Verification of the degree of protection of enclosures . 53
D.4 Climatic category . 54
D.4.1 General . 54
D.4.2 Test conditions and requirements . 54
Annex E (normative) Information for the correct application of the fuse-holder . 55
Bibliography . 56
– 4 – IEC 60127-6:2023 © IEC 2023
Figure 1 – Outline of gauges and dummy fuse-links according to IEC 60127-2. 18
Figure 2 – Outline of gauges and dummy fuse-links according to IEC 60127-3:2015,
standard sheet 1 . 19
Figure 3 – Outline of gauges and dummy fuse-links according to IEC 60127-3:2015,
standard sheets 3 and 4 . 19
Figure 4 – Panel mounting . 24
Figure 5 – PC board mounting . 24
Figure 6 – Test device for mechanical test . 29
Figure 7 – Examples of snap-in fastening Fuse-holder on panels . 32
Figure 8 – Tensile force test . 36
Figure 9 – Compressive force test . 36
Figure 10 – Example of test device . 38
Figure 11 – IEC 60127-3:2015, Standard sheet 1 . 41
Figure 12 – IEC 60127-3:2015, Standard sheets 3 and 4 . 41
Figure 13 – Illustration of temperatures experienced in practice . 43
Figure 14 – Example of a derating curve . 46
Figure A.1 – Example of a test board . 49
Table 1 – Features of unexposed or exposed fuse-holders . 15
Table 2 – Values for preferred ratings and classifications . 16
Table 3 – Dimensions and materials for gauges according to IEC 60127-2 . 18
Table 4 – Dimensions and materials for gauges according to IEC 60127-3 . 20
Table 5 – Types of insulation between different live parts and accessible parts . 21
Table 6 – Required impulse withstand voltage for clearances . 22
Table 7 – Minimum clearances in air under overvoltage category II II. 22
Table 8 – Minimum clearances in air under overvoltage category II . 23
Table 9 – Minimum creepage distances in millimetres for a microenvironment-
dependent on rated voltage, pollution degree, insulating material, corresponding to
IEC 60664-1:2020, Table F.5 . 23
Table 10 – Values for insulation resistance, dielectric strength and impulse withstand
voltage . 28
Table 11 – Values for torque and axial pull . 30
Table 12 – Torque values . 31
Table 13 – Torque values . 32
Table 14 – Mounting groups . 33
Table 15 – Cross-sections of conductors . 34
Table 16 – Tensile and compressive forces . 36
Table 17 – Dimensions and materials for dummy fuse-link according to IEC 60127-2 . 39
Table 18 – Dummy fuse-links according to IEC 60127-2 . 39
Table 19 – Dimensions and materials for dummy fuse-links according to IEC 60127-3 . 40
Table 20 – Dummy fuse-links according to IEC 60127-3 . 42
Table 21 – Maximum allowable temperatures . 44
Table A.1 – Copper layer for test board . 49
Table B.1 – Type tests, test sequences and number of samples . 50
Table D.1 – Examples of climatic categories . 54
Table E.1 – Information for the correct application of the fuse-holder . 55
– 6 – IEC 60127-6:2023 © IEC 2023
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MINIATURE FUSES –
Part 6: Fuse-holders for 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
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other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) 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) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
may be required to implement this document. However, implementers are cautioned that this may not represent
the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
IEC 60127-6 has been prepared by subcommittee 32C: Miniature fuses, of IEC technical
committee 32: Fuses. It is an International Standard.
This third edition cancels and replaces the second edition published in 2014. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) enhanced maximum rated current from 16 A to 25 A in Clause 1;
b) adding of IEC 60127-4 and IEC 60127-7 in Clause 1;
c) modification of marking position in Clause 6;
d) modification of rated voltage, rated current and rated power acceptance in Table 2;
e) modification of Table 5, Table 6, Table 7, Table 9, Table 16 and Table A.1.
The text of this International Standard is based on the following documents:
Draft Report on voting
32C/620/FDIS 32C/623/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/standardsdev/publications.
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 document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
– 8 – IEC 60127-6:2023 © IEC 2023
INTRODUCTION
According to the wish expressed by the users of miniature fuses, all standards,
recommendations and other documents relating to miniature fuses 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.
To this day, the IEC 60127 series, is thus subdivided as follows:
IEC 60127-1, Miniature fuses – Part 1: Definitions for miniature fuses and general requirements
for miniature fuse-links
IEC 60127-2, Miniature fuses – Part 2: Cartridge fuse-links
IEC 60127-3, Miniature fuses Part 3: Sub-miniature fuse-links
IEC 60127-4, Miniature fuses – Part 4: Universal modular fuse-links (UMF) – Through-hole and
surface mount types
IEC 60127-5, Miniature fuses – Part 5: Guidelines for quality assessment of miniature fuse-links
IEC 60127-6, Miniature fuses – Part 6: Fuse-holders for miniature fuse-links
IEC 60127-7, Miniature fuses – Part 7: Miniature fuse-links for special applications
IEC 60127-8, Miniature fuses – Part 8: Fuse resistors with particular overcurrent protection
IEC 60127-10, Miniature fuses – Part 10:User guide for miniature fuses
This part of IEC 60127 covers requirements, test equipment and test methods for fuse-holders.
It is a self-standing document, which refers back to IEC 60127-1 with regard to certain
definitions and the atmospheric conditions for test. It also makes reference to other parts of the
IEC 60127 series with regard to dimensions and maximum power losses of fuse-links.
MINIATURE FUSES –
Part 6: Fuse-holders for miniature fuse-links
1 Scope
This part of IEC 60127 is applicable to fuse-holders for miniature cartridge fuse-links according
to IEC 60127-2, sub-miniature fuse-links according to IEC 60127-3, universal modular fuse-
links to IEC 60127-4 and miniature fuse-links for special applications to IEC 60127-7 for the
protection of electric appliances, electronic equipment and component parts thereof, normally
intended for use indoors.
NOTE Requirements for fuse-holders for miniature fuse-links complying with IEC 60127-4 and IEC 60127-7 are
under consideration.
It does not apply to fuse holders for fuses completely covered by the subsequent parts of
IEC 60269-1.
This document applies to fuse-holders with:
– a maximum rated current of 25 A and
– a maximum rated voltage of 1 500 V DC or 1 000 V AC; and
– for use up to 2 000 m above sea-level, unless otherwise specified.
The object of this document is to establish uniform requirements for safety and the assessment
of electrical, mechanical, thermal and climatic properties of fuse-holders and the compatibility
between fuse-holders and fuse-links.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies.
For undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60050-441, International Electrotechnical Vocabulary (IEV) – Part 441: Switchgear,
controlgear and fuses
IEC 60050-581, International Electrotechnical Vocabulary (IEV) – Part 581: Electromechanical
components for electronic equipment
IEC 60068-1:2013, Environmental testing – Part 1: General and guidance
IEC 60068-2-6:2007, Environmental testing – Part 2-6: Tests – Test Fc: Vibration (sinusoidal)
IEC 60068-2-20:2021, Environmental testing – Part 2-20: Tests – Tests Ta and Tb: Test
methods for solderability and resistance to soldering heat of devices with leads
IEC 60068-2-21, Environmental testing – Part 2-21: Tests – Test U: Robustness of terminations
and integral mounting devices
IEC 60068-2-27:2008, Environmental testing – Part 2-27: Tests – Test Ea and guidance: Shock
– 10 – IEC 60127-6:2023 © IEC 2023
IEC 60068-2-45, Basic environmental testing procedures – Part 2-45: Tests – Test XA and
guidance: Immersion in cleaning solvents
IEC 60068-2-47, Environmental testing – Part 2-47: Test – Mounting of specimens for vibration,
impact and similar dynamic tests
IEC 60068-2-75, Environmental testing – Part 2-75: Tests – Test Eh: Hammer tests
IEC 60127-1 :2006, Miniature fuses – Part 1: Definitions for miniature fuses and general
requirements for miniature fuse-links
IEC 60127-1:2006/AMD1:2011
IEC 60127-1:2006/AMD2:2015
IEC 60127-2, Miniature fuses – Part 2: Cartridge fuse-links
IEC 60127-3:2015, Miniature fuses – Part 3: Sub-miniature fuse-links
IEC 60216-1, Electrical insulating materials – Thermal endurance properties – Part 1: Ageing
procedures and evaluation of test results
IEC 60529:1989, Degrees of protection provided by enclosures (IP Code)
IEC 60664-1:2020, Insulation coordination for equipment within low-voltage supply systems –
Part 1: Principles, requirements and tests
IEC 60695-4:2012, Fire hazard testing – Part 4: Terminology concerning fire tests for
electrotechnical products
IEC 60695-2-12:2021, Fire hazard testing – Part 2-12: Glowing/hot-wire based test methods –
Glow-wire flammability index (GWFI) test method for materials
IEC 60695-2-13:2021, Fire hazard testing – Part 2-13: Glowing/hot-wire based test methods –
Glow-wire ignition temperature (GWIT) test method for materials
IEC 60695-11-5:2016, Fire hazard testing – Part 11-5: Test flames – Needle-flame test method
– Apparatus, confirmatory test arrangement and guidance
IEC 60999-1, Connecting devices – Electrical copper conductors – Safety requirements for
screw-type and screwless-type clamping units – Part 1: General requirements and particular
2 2
requirements for clamping units for conductors from 0,2 mm up to 35 mm (included)
IEC 61210, Connecting devices – Flat quick-connect terminations for electrical copper
conductors – Safety requirements
___________
A consolidated version of this publication exists, comprising IEC 60127-1:2006, IEC 60127-1:2006/AMD 1:2011
and IEC 60127-1:2006/AMD 2:2015.
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-441,
IEC 60050-581, IEC 60127-1 and the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
fuse-holder
combination of a fuse-base with its fuse-carrier
Note 1 to entry: In some fuse-holder constructions where the fuse-base and the fuse-carrier are not separate parts
the fuse-holder may consist of only the fuse-base and no fuse-carrier.
3.1.1
fuse-base
fuse-mount
fixed part of a fuse provided with contacts and terminals for connection to the system
[SOURCE: IEC 60127-1:2006, 3.10]
3.1.2
fuse-carrier
movable part of a fuse designed to carry a fuse-link
[SOURCE: IEC 60127-1:2006, 3.12]
3.1.3
unexposed fuse-holder
fuse-holder with enclosed contacts
3.1.4
exposed fuse-holder
fuse-holder with exposed contacts
EXAMPLE Clips.
3.2
rating
characteristic values that together define the working conditions upon which the tests are based
and for which the fuse-holder is designed
EXAMPLE Examples of rated values usually stated for fuse-holders are:
− voltage (U );
N
− current (I );
N
− power acceptance.
3.3
rated power acceptance
value of power acceptance of a fuse-holder assigned by the manufacturer
Note 1 to entry: This value is the maximum power dissipation produced by the inserted dummy fuse-link during
testing, at the rated current tolerated by the fuse-holder without exceeding the specified temperatures.
Note 2 to entry: The rated power acceptance is referred to an ambient temperature of 23 °C.
– 12 – IEC 60127-6:2023 © IEC 2023
3.4
rated current
value of current of a fuse-holder assigned by the manufacturer and to which the rated power
acceptance is referred
3.5
rated voltage
value of voltage of a fuse-holder assigned by the manufacturer and to which operation and
performance characteristics are referred
3.6
insulation coordination
mutual correlation of insulation characteristics of electrical equipment taking into account the
expected micro-environment and other influencing stresses
[SOURCE: IEC 60664-1:2020, 3.1.3, modified – Note 1 to entry has been removed.]
3.7
impulse withstand voltage
highest peak value of impulse voltage of specified form and polarity which does not cause
breakdown of insulation under specified conditions
[SOURCE: IEC 60664-1:2020, 3.1.15]
3.8
overvoltage category
numeral defining a transient overvoltage condition
Note 1 to entry: Specified categories, see Clause C.1.
[SOURCE: IEC 60664-1:2020, 3.1.20, modified – Note 1 to entry “Overvoltage categories I, II,
III and IV are used, see 4.3.2” has been entirely reworded.”]
3.9
pollution
any condition of foreign matter, solid, liquid, or gaseous (ionized
gases), that can affect dielectric strength or surface resistivity
[SOURCE: IEC 60664-1:2020, 3.1.24]
3.10
pollution degree
numeral characterizing the expected pollution of the micro-environment
Note 1 to entry: see Clause C.2.
[SOURCE: IEC 60664-1:2020, 3.1.25, modified – Note 1 to entry has been added].
3.11
micro-environment
ambient conditions which immediately influences the dimensioning of
the clearance and creepage distances
[SOURCE: IEC 60664-1:2020, 3.1.23]
3.12
clearance
shortest distance in air between two conductive parts
[SOURCE: IEC 60664-1:2020, 3.1.4]
3.13
creepage distance
shortest distance along the surface of a solid insulating material between two conductive parts
[SOURCE: IEC 60050-151:2001, 151-15-50]
3.14
solid insulation
solid insulating material or a combination of solid insulating material, placed between two
conductive parts or between a conductive part and a body part
[SOURCE: IEC 60664-1:2020, 3.1.6]
3.15
comparative tracking index
CTI
numerical value of the maximum voltage in volts which a material can withstand without tracking
and without a persistent flame occurring under specified test conditions
Note 1 to entry: The test for comparative tracking index in accordance with IEC 60112 is designed to compare the
performance of various insulating materials under test conditions, namely drops of an aqueous contaminant falling
on a horizontal surface leading to electrolytic conduction material groups and their CTI values, see Clause C.3.
[SOURCE: IEC 60050-212:2010, 212-11-59, modified – The Note to entry has been added.]
3.16
live part
conductor or conductive part intended to be energized in normal operation, including a neutral
conductor, but by convention, not a PEN conductor or PEM conductor or PEL conductor
Note 1 to entry: This concept does not necessarily imply a risk of electric shock.
[SOURCE: IEC 60050-826:2022, 826-12-08, modified – The domain “
and equipment> has been deleted, the definition has been reworded and the note to entry has
been added.]
3.17
fuse-holder electric shock protection categories
designation characterizing the level of the protection against electric shock of a fuse-holder
3.18
maximum allowable ambient temperature
highest air temperature, in the immediate vicinity, that a fuse-holder can endure at a power
acceptance assigned by the manufacturer of the fuse-holder without exceeding the maximum
allowable temperatures on the accessible and inaccessible surfaces of the fuse-holder
3.19
relative temperature index
based on IEC 60216-1, temperature index of a test material obtained from the time which
corresponds to the known temperature index of a reference material when both materials are
subjected to the same ageing and diagnostic procedures in comparative test
– 14 – IEC 60127-6:2023 © IEC 2023
3.20
insulation
part of an electrotechnical product which separates the conducting parts at different electric
potentials during operation or insulates such parts from the surroundings
Note 1 to entry: For detailed information, see IEC 61140 and IEC 60664-1.
[SOURCE: IEC 60050-212:2010, 212-11-07, modified – The term “electric insulation” has been
replaced by “insulation”.]
3.20.1
functional insulation
insulation between conductive parts which is necessary only for the proper functioning of the
equipment
[SOURCE: IEC 60664-1:2020, 3.1.29]
3.20.2
basic insulation
insulation of hazardous-live-parts which provides basic protection
Note 1 to entry: The concept does not apply to insulation used exclusively for functional purposes.
[SOURCE: IEC 60050-826:2022, 826-12-14, modified – In the definition, the term “insulation”
has been replaced by “insulation of hazardous-live-parts”.]
3.20.3
supplementary insulation
independent insulation applied in addition to basic insulation for fault protection
[SOURCE: IEC 60050-826:2022, 826-12-15]
3.20.4
double insulation
insulation comprising both basic insulation and supplementary insulation
[SOURCE: IEC 60050-826:2022, 826-12-16]
3.20.5
reinforced insulation
insulation of hazardous-live-parts which provides a degree of protection against electric shock
equivalent to double insulation
Note 1 to entry: Reinforced insulation can comprise several layers which cannot be tested singly as basic insulation
or supplementary insulation.
[SOURCE: IEC 60050-826:2022, 826-12-17, modified – In the definition, the term “insulation”
has been replaced by “insulation of hazardous-live-parts”.]
3.21
inaccessible part
inaccessible surface
part or surface inside the equipment which cannot be touched by means of the standard test
finger according to IEC 60529
3.22
accessible part
accessible surface
part or surface which can be touched by means of the standard test finger according to
IEC 60529, when the fuse-holder is installed and operated as in normal use, e.g. on the front
panel of equipment
3.23
gauge
test fuse-link without a melting element
4 General requirements
Fuse-holders shall be so designed and constructed that in normal use, installed according to
the manufacturer’s instructions, their performance is reliable and without danger to the user or
surroundings.
In general, compliance is checked by carrying out all of the relevant tests specified.
Additional tests and requirements may be added in accordance with the manufacturer's
declaration, as shown in Annex D.
Examples of fuse-holder types with different features are given in Table 1.
Table 1 – Features of unexposed or exposed fuse-holders
No. description
1 Types of mounting:
– Panel and base mounting
– Printed circuit board mounting
Methods of fastening:
– Methods of fastening on panel:
• Fixing nut fastening (threaded nut)
• Snap-in fastening:
a) Fuse-base with an integral spring system
b) Fuse-base with a separate spring-nut (a nut fabricated, e.g. from thin spring steel having an
impression designed to accommodate the mating part)
– Methods of fastening on printed circuit (PC) board:
• Solder fastening
• Plug-in fastening
Methods of insertion of the fuse-carrier into the fuse base:
– Screw insertion
– Bayonet insertion
– Plug-in insertion
Types of terminals:
– Screw terminals
– Solder terminals
– Quick connect terminals
– Other solderless terminals:
• crimp terminals
• wire wrap terminals
– 16 – IEC 60127-6:2023 © IEC 2023
No. description
5 Protection against electric shock
– Fuse-holder without integral protection against electric shock
– Fuse-holder with integral protection against electric shock
– Fuse-holder with enhanced integral protection against electric shock
NOTE This list is not intended to be
...
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