IEC 60127-6:2014
(Main)Miniature fuses - Part 6: Fuse-holders for miniature fuse-links
Miniature fuses - Part 6: Fuse-holders for miniature fuse-links
IEC 60127-6:2014 is applicable to fuse-holders for miniature cartridge fuse-links according to IEC 60127-2 and sub-miniature fuse-links according to IEC 60127-3 for the protection of electric appliances, electronic equipment and component parts thereof, normally intended for use indoors. Examples of fuse-holder types with different features are given. This part of IEC 60127 applies to fuse-holders with:
- a maximum rated current of 16 A; and
- a maximum rated voltage of 1 500 V d.c. or 1 000 V a.c.; and
- for use up to 2 000 m above sea-level, unless otherwise specified. The object of this standard 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. This second edition cancels and replaces the first edition published in 1994, its Amendment 1 (1996) and Amendment 2 (2002). This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- modify the arrangement of the fuse-holder samples in the planes in 13.1.1;
- add a new test 13.2.2: Glow-wire ignition test;
- change maximum gauge size for standard sheets 3 and 4 from 0,70 to 0,63 in table 5;
- change minimum gauge size for standard sheets 3 and 4 from 0,55 to 0,56 in table 5. Keywords: fuse-holders for miniature cartridge fuse-links, sub-miniature fuse-links, protection of electric appliances, electronic equipment and component parts.
Coupe-circuit miniatures - Partie 6: Ensembles-porteurs pour cartouches de coupe-circuits miniatures
L'IEC 60127-6:2014 s'applique aux ensembles-porteurs pour éléments de remplacement à cartouches conformes à l'IEC 60127-2 et aux éléments de remplacement subminiatures conformes à l'IEC 60127-3 pour la protection d'appareils électriques, de matériels électroniques et de leurs éléments constituants, normalement destinés à être utilisés à l'intérieur de bâtiments. Des exemples de types d'ensembles-porteurs dont les caractéristiques sont différentes sont indiqués. La présente partie de l'IEC 60127 s'applique:
- aux ensembles-porteurs de courant assigné maximal de 16 A; et
- de tension assignée maximale de 1 500 V c.c. ou 1 000 V c.a.;
- et pour l'utilisation jusqu'à 2 000 m au-dessus du niveau de la mer, sauf spécification contraire. La présente norme a pour objet d'établir des exigences uniformes relatives à la sécurité et à l'évaluation des propriétés électriques, mécaniques, thermiques et climatiques des ensembles-porteurs et à la compatibilité entre l'ensemble-porteur et l'élément de remplacement. Cette deuxième édition annule et remplace la première édition parue en 1994, son Amendement 1 (1996) et son Amendement 2 (2002). Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- modification de la disposition des échantillons d'ensembles-porteurs dans les plans en 13.1.1;
- ajout d'un nouvel essai 13.2.2: Essai d'allumabilité au fil incandescent;
- modification de la taille maximale des calibres pour les feuilles de norme 3 et 4 de 0,70 à 0,63 au Tableau 5;
- modification de la taille minimale des calibres pour les feuilles de norme 3 et 4 de 0,55 à 0,56 au Tableau 5. Mots clés: ensembles-porteurs pour éléments de remplacement à cartouches, éléments de remplacement subminiatures, protection d'appareils électriques, de matériels électroniques et de leurs éléments constituants
General Information
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Standards Content (Sample)
IEC 60127-6 ®
Edition 2.0 2014-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Miniature fuses –
Part 6: Fuse-holders for miniature fuse-links
Coupe-circuits miniatures –
Partie 6: Ensembles-porteurs pour cartouches de coupe-circuits miniatures
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IEC 60127-6 ®
Edition 2.0 2014-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Miniature fuses –
Part 6: Fuse-holders for miniature fuse-links
Coupe-circuits miniatures –
Partie 6: Ensembles-porteurs pour cartouches de coupe-circuits miniatures
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX XA
ICS 29.120.50 ISBN 978-2-8322-1830-3
– 2 – IEC 60127-6:2014 IEC 2014
CONTENTS
FOREWORD . 6
INTRODUCTION . 8
1 Scope . 9
2 Normative references . 10
3 Terms and definitions . 11
3.1 Fuse-holders . 12
4 General requirements . 15
5 Preferred standard ratings and classifications for fuse-holders . 15
6 Marking . 16
7 Clause deleted . 16
8 General notes on tests . 16
8.1 Nature of tests . 16
8.2 Standard atmospheric conditions for measurement and tests . 17
8.3 Preconditioning of test samples . 17
8.4 Nature of supply . 17
8.5 Gauges and dummy fuse-links for tests . 17
8.5.1 Gauges and dummy fuse-links according to IEC 60127-2 . 17
8.5.2 Gauges and dummy fuse-links according to IEC 60127-3 . 18
8.6 Type tests . 20
9 Protection against electric shock . 20
9.1 Category PC1: Fuse-holders without integral protection against electric
shock . 20
9.2 Category PC2: Fuse-holders with integral protection against electric shock . 21
9.3 Category PC3: Fuse-holders with enhanced integral protection against
electric shock . 21
10 Clearances and creepage distances . 21
10.1 General . 21
10.2 Minimum requirements for fuse-holders in respect to the grade of insulation . 21
10.3 Clearances . 22
10.4 Creepage distances . 23
11 Electrical requirements . 24
11.1 Insulation resistance, dielectric strength and impulse withstand voltage . 24
11.1.1 Mounting . 24
11.1.2 Humidity preconditioning . 25
11.1.3 Measurement of insulation resistance . 25
11.1.4 Dielectric strength test . 26
11.1.5 Impulse withstand voltage test . 26
11.2 Contact resistance . 26
11.2.1 General measuring requirements . 26
11.2.2 Measuring cycle. 27
11.2.3 Measurement and requirements . 27
12 Mechanical requirements . 29
12.1 General . 29
12.2 Mounting . 29
12.3 Compatibility between fuse-holder and fuse-link . 29
12.4 Mechanical strength of the connection between fuse-base and fuse-carrier . 30
12.4.1 Screw and bayonet connections . 30
12.4.2 Plug-in connection . 30
12.5 Impact test . 31
12.6 Mechanical strength of the fuse-holder fastening on panels . 31
12.6.1 Fixing nut fastening . 31
12.6.2 Fixing screw fastening . 31
12.6.3 Snap-in fastening . 32
12.7 Terminals of fuse-bases . 33
12.7.1 Terminals with screw-type clamping or screwless-type clamping . 33
12.7.2 Terminals for soldering . 33
12.7.3 Quick-connect male tab terminals . 35
12.7.4 Quick-connect male tab terminals combined with solder tag terminals . 36
12.8 Resistance to vibration . 36
12.8.1 General . 36
12.8.2 Mounting . 36
12.8.3 Measurement and requirements . 37
13 Thermal requirements . 37
13.1 Rated power acceptance test . 37
13.1.1 General . 37
13.1.2 Mounting . 37
13.1.3 Dummy fuse-links . 38
13.1.4 Measurement of maximum allowable temperatures on fuse-holders . 40
13.1.5 Correlation between ambient air temperature TA1 and the power
acceptance of a fuse-holder . 42
13.1.6 Temperature measuring point for ambient air temperature T . 43
A1
13.1.7 Test method . 43
13.2 Resistance to abnormal heat and fire . 44
13.2.1 Needle-flame test . 44
13.2.2 Glow-wire ignition test . 45
14 Endurance . 45
14.1 General . 45
14.2 Endurance test. 45
14.3 Requirements . 45
15 Additional requirements . 45
15.1 Resistance to rusting . 45
15.2 Resistance to cleaning solvents . 46
Annex A (normative) Test PC board for fuse-holders of rated currents up to 10 A . 47
Annex B (normative) Type tests, test sequences and number of samples . 48
Annex C (informative) Insulation coordination . 49
C.1 Overvoltage categories . 49
C.2 Degrees of pollution in the micro-environment . 49
C.3 Comparative tracking index CTI . 50
Annex D (informative) Additional tests and requirements . 51
D.1 General . 51
D.2 Resistance to shock . 51
D.2.1 General . 51
D.2.2 Mounting . 51
– 4 – IEC 60127-6:2014 IEC 2014
D.2.3 Measurement and requirements . 51
D.3 Verification of the degree of protection of enclosures . 51
D.4 Climatic category . 52
D.4.1 General . 52
D.4.2 Test conditions and requirements . 52
Annex E (informative) Information for the correct application of the fuse-holder . 53
Bibliography . 54
Figure 1 – Outline of gauges and dummy fuse-links according to IEC 60127-2. 17
Figure 2 – Outline of gauges and dummy fuse-links according to IEC 60127-3
standard sheet 1 . 19
Figure 3 – Outline of gauges and dummy fuse-links according to IEC 60127-3
standard sheets 3 and 4 . 19
Figure 4 – Panel mounting . 25
Figure 5 – PC board mounting . 25
Figure 6 – Test device for mechanical test . 29
Figure 7 – Fuse-holder fastening on panels . 32
Figure 8 – Tensile force test . 36
Figure 9 – Compressive force test . 36
Figure 10 – Test device . 38
Figure 11 – Illustration of temperatures experienced in practice . 41
Figure 12 – Example of a derating curve . 44
Figure A.1 – Example of a test board . 47
Table 1 – Features of unexposed or exposed fuse-holders . 9
Table 2 – Values for standard ratings and classifications . 16
Table 3 – Dimensions and materials for gauges according to IEC 60127-2 . 18
Table 4 – Dimensions and materials for dummy fuse-links according to IEC 60127-2 . 18
Table 5 – Dimensions and materials for gauges according to IEC 60127-3 . 20
Table 6 – Dimensions and materials for dummy fuse-links according to IEC 60127-3 . 20
Table 7 – Types of insulation between different live parts and accessible parts . 21
Table 8 – Required impulse withstand voltage for clearances . 22
Table 9 – Overvoltage category II . 23
Table 10 – Overvoltage category III . 23
Table 11 – Minimum creepage distances in millimetres for a micro-
environmentdependent on rated voltage, pollution degree, insulating
material,corresponding to IEC 60664-1:2007, Table F.4 . 24
Table 12 – Values for insulation resistance, dielectric strength and impulse withstand
voltage . 28
Table 13 – Values for torque and axial pull . 30
Table 14 – Torque values . 31
Table 15 – Torque values . 32
Table 16 – Mounting groups . 33
Table 17 – Cross-sections of conductors . 34
Table 18 – Tensile and compressive forces . 36
Table 19 – Dummy fuse-links according to IEC 60127-2 . 39
Table 20 – Dummy fuse-links according to IEC 60127-3 . 40
Table 21 – Maximum allowable temperatures . 42
Table A.1 – Copper layer for test board . 47
Table B.1 – Type tests, test sequences and number of samples . 48
Table D.1 – Examples of climatic categories . 52
Table E.1 – Information for the correct application of the fuse-holder . 53
– 6 – IEC 60127-6:2014 IEC 2014
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,
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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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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
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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
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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 60127-6 has been prepared by subcommittee 32C: Miniature fuses,
of IEC technical committee 32: Fuses.
This second edition cancels and replaces the first edition published in 1994, its Amendment 1
(1996) and Amendment 2 (2002). This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) modify the arrangement of the fuse-holder samples in the planes in 13.1.1;
b) add a new test 13.2.2：Glow-wire ignition test;
c) change maximum gauge size for standard sheets 3 and 4 from 0,70 to 0,63 in table 5;
d) change minimum gauge size for standard sheets 3 and 4 from 0,55 to 0,56 in table 5.
The text of this standard is based on the following documents:
FDIS Report on voting
32C/491/FDIS 32C/497/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.
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.
– 8 – IEC 60127-6:2014 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, Part 1: Definitions for miniature fuses and general requirements for miniature
fuse-links
IEC 60127-2, Part 2: Cartridge fuse-links
IEC 60127-3, Part 3: Sub-miniature fuse-links
IEC 60127-4, Part 4: Universal modular fuse-links (UMF) – Through-hole and surface mount
types
IEC 60127-5, Part 5: Guidelines for quality assessment of miniature fuse-links
IEC 60127-6, Part 6: Fuse-holders for miniature cartridge fuse-links
IEC 60127-7, 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, 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 Part 1 with regard to certain definitions
and the atmospheric conditions for test. It also makes reference to other parts of IEC 60127
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 and sub-miniature fuse-links according to IEC 60127-3 for the
protection of electric appliances, electronic equipment and component parts thereof, normally
intended for use indoors.
Examples of fuse-holder types with different features are given in Table 1.
Table 1 – Features of unexposed or exposed fuse-holders
1 Types of mounting
1.1 Panel and base mounting
1.2 Printed circuit board mounting
2 Methods of fastening
2.1 Methods of fastening on panel:
2.1.1 Fixing nut fastening (threaded nut)
2.1.2 Snap-in fastening:
2.1.2.1 Fuse-base with an integral spring system
2.1.2.2 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)
2.2 Methods of fastening on printed circuit (PC) board:
2.2.1 Solder fastening
2.2.2 Plug-in fastening
3 Methods of insertion of the fuse-carrier into the fuse base
3.1 Screw insertion
3.2 Bayonet insertion
3.3 Plug-in insertion
4 Types of terminals
4.1 Screw terminals
4.2 Solder terminals
4.3 Quick connect terminals
4.4 Other solderless terminals: – crimp terminals
– wire wrap terminals
5 Protection against electric shock
5.1 Fuse-holder without integral protection against electric shock
5.2 Fuse-holder with integral protection against electric shock
5.3 Fuse-holder with enhanced integral protection against electric shock
NOTE This list is not intended to be comprehensive and fuse-holders which are not listed are not necessarily
excluded from the scope.
This part of IEC 60127 applies to fuse-holders with:
– 10 – IEC 60127-6:2014 IEC 2014
– a maximum rated current of 16 A; and
– a maximum rated voltage of 1 500 V d.c. or 1 000 V a.c.; and
– for use up to 2 000 m above sea-level, unless otherwise specified.
The object of this standard 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, 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 60050 (all parts), International Electrotechnical Vocabulary
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 60068-2-20:2008, 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 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 60127-2:2003, Miniature fuses - Part 2: Cartridge fuse-links
IEC 60127-2:2003/AMD1:2003
IEC 60127-2:2003/AMD2:2010
IEC 60127-3:1988, 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 60664-1:2007, Insulation coordination for equipment within low-voltage systems - Part 1:
Principles, requirements and tests
IEC 60695-11-5:2004, Fire hazard testing - Part 11-5: Test flames - Needle-flame test method
- Apparatus, confirmatory test arrangement and guidance
IEC 60695-2-12:2010, Fire hazard testing - Part 2-12: Glowing/hot-wire based test methods -
Glow-wire flammability index (GWFI) test method for materials
IEC 60695-2-12:2010/AMD1:2014
IEC 60695-2-13:2010, Fire hazard testing - Part 2-13: Glowing/hot-wire based test methods -
Glow-wire ignition temperature (GWIT) test method for materials
IEC 60695-2-13:2010/AMD1:2014
IEC 60999-1:1999, Connecting devices - Electrical copper conductors - Safety requirements
for screw-type and screwless-type clamping units - Part 1: General requirements and
2 2
particular 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.
– 12 – IEC 60127-6:2014 IEC 2014
3.1 Fuse-holders
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
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 spearate
parts the fuse-holder may consist of only the fuse-base and no fuse-carrier.
3.1.4
unexposed fuse-holder
fuse-holder with enclosed contacts
3.1.5
exposed fuse-holder
fuse-holder with exposed contacts (e.g. clips)
3.2
rating
general term employed to designate the characteristic values that together define the working
conditions upon which the tests are based and for which the fuse is designed
EXAMPLE Examples of rated values usually stated for fuses:
– voltage (U );
N
– current (I );
N
– breaking capacity.
[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 60664-1:2007, 3.1]
3.7
impulse withstand voltage
highest peak value of impulse voltage of prescribed form and polarity which does not cause
breakdown of insulation under specified conditions
[SOURCE: IEC 60664-1:2007, 3.8.1]
3.8
overvoltage category
numeral defining a transient overvoltage condition
specified categories, see C.1
[SOURCE: IEC 60664-1:2007, 3.10, modified by addition of “specified categories”]
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
[SOURCE: IEC 60664-1:2007, 3.11]
3.10
pollution degree
numeral characterizing the expected pollution of the micro-environment
specified degrees, see C.2
[SOURCE: IEC 60664-1:2007, 3.13, modified by addition of “specified categories”]
3.11
micro-environment
immediate environment of the insulation which particularly influences the dimensioning of the
creepage distances
[SOURCE: IEC 60664-1:2007, 3.12.2]
3.12
clearance
shortest distance in air between two conductive parts
[SOURCE: IEC 60664-1:2007, 3.2]
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]
– 14 – IEC 60127-6:2014 IEC 2014
3.14
solid insulation
solid insulating material interposed between two conductive parts
[SOURCE: IEC 60664-1:2007, 3.4]
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 C.3.
[SOURCE: IEC 60050-212:2010, 212-11-59, modified by addition of Note to entry]
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
[SOURCE: IEC 60050-826:2004, 826-12-08]
3.17
fuse-holder electric shock protection categories
a designation characterizing the level of the protection against electric shock of a fuse-holder
3.18
maximum ambient air temperature
the highest air temperature 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, the 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
that part of an electrotechnical product which separates the conducting parts at different
electrical potentials
Note 1 to entry: For detailed information, see IEC 61140 and IEC 60664-1.
[SOURCE: IEC 60050-212:2010, 212-01-05]
3.20.1
functional insulation
insulation between conductive parts which is necessary only for the proper functioning of the
equipment
[SOURCE: IEC 60664-1:2007, 3.17.1]
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 60050-826:2004, 826-12-14]
3.20.3
supplementary insulation
independent insulation applied in addition to basic insulation for fault protection
[SOURCE: IEC 60050-826:2004, 826-12-15]
3.20.4
double insulation
insulation comprising both basic insulation and supplementary insulation
[SOURCE: IEC 60050-826:2004, 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 comprise several layers which cannot be tested singly as basic
insulation or supplementary insulation.
[SOURCE: IEC 60050-826:2004, 826-12-17]
3.21
inaccessible part (inaccessible surface)
part or surface inside the equipment and 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
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.
5 Preferred standard ratings and classifications for fuse-holders
Table 2 gives the values for standard ratings and classifications.
– 16 – IEC 60127-6:2014 IEC 2014
Table 2 – Values for standard ratings and classifications
No. Preferred ratings and classifications For fuse-links according to
for fuse-holders
IEC 60127-2 IEC 60127-3
5.1 Rated voltage 250 V 125 V and 250 V
5.2 Rated current 6,3 A / 10 A 5 A
5.3 Rated power acceptance at an ambient temperature T 1,6 W / 2,5 W / 4 W 1,
...
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