IEC 60282-2:2008

IEC 60282-2
Edition 3.0 2008-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
High-voltage fuses –
Part 2: Expulsion fuses
Fusibles à haute tension –
Partie 2: Coupe-circuit à expulsion

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IEC 60282-2
Edition 3.0 2008-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
High-voltage fuses –
Part 2: Expulsion fuses
Fusibles à haute tension –
Partie 2: Coupe-circuit à expulsion

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
XA
CODE PRIX
ICS 29.120.50 ISBN 2-8318-9739-4

– 2 – 60282-2 © IEC:2008
CONTENTS
FOREWORD.4
1 Scope.6
2 Normative references .6
3 Terms and definitions .7
3.1 Electrical characteristics.7
3.2 Fuses and their component parts (see Figure 1).9
3.3 Additional terms .11
4 Service conditions .12
4.1 Normal service conditions .12
4.2 Special service conditions .12
5 Classification and designation .12
5.1 Classification.12
5.2 Fuse-link speed designation .13
6 Ratings.13
6.1 General .13
6.2 Rated voltage.13
6.3 Rated current .14
6.4 Rated frequency.14
6.5 Rated breaking capacity .14
6.6 Rated insulation level (of a fuse or fuse-base).14
7 Standard conditions of use and behaviour .15
7.1 Standard conditions of use with respect to breaking capacity .15
7.2 Standard conditions of behaviour with respect to breaking capacity.15
7.3 Time-current characteristics .16
7.4 Temperature and temperature rise .16
7.5 Electromagnetic compatibility .17
7.6 Mechanical requirements (for distribution fuse-cutouts) .17
8 Type tests .17
8.1 Conditions for performing the tests .17
8.2 List of type tests and test reports.17
8.3 Common test practices for all type tests .18
8.4 Dielectric tests .18
8.5 Temperature-rise tests .19
8.6 Breaking tests .20
8.7 Time-current characteristics tests.24
8.8 Mechanical tests (for distribution fuse-cutouts).25
8.9 Artificial pollution tests .25
9 Special tests.26
9.1 General .26
9.2 Lightning surge impulse withstand test .26
10 Acceptance tests .27
11 Markings and information .27
11.1 Identifying markings .27
11.2 Information to be given by the manufacturer.27
12 Application guide.27

60282-2 © IEC:2008 – 3 –
12.1 Object .27
12.2 General .28
12.3 Application .28
12.4 Operation .30
12.5 Information about special requirements not covered by this standard .30
Annex A (informative) Reasons for the selection of breaking-test values.48
Annex B (informative) Typical dimensions for fuse-links having an inner arc-quenching
tube and used in distribution fuse-cutouts and open-link cutouts.50
Annex C (informative) Operating rods for fuses.52
Bibliography.53

Figure 1 – Terminology for expulsion fuses.42
Figure 2 – Diagram of connections of a three-pole fuse .43
Figure 3 – Typical diagrams for breaking tests .44
Figure 4 – Breaking-test arrangement of the equipment .45
Figure 5 – Breaking-test interpretation of oscillograms.46
Figure 6 – Representation of a specified TRV by a two-parameter reference line and a
delay line .47
Figure 7 – Example of prospective test TRV with two-parameter envelope which
satisfies the conditions to be met during type test .47
Figure B.1 – Typical dimensions for fuse-links having an inner arc-quenching tube, and
used in distribution fuse-cutouts and open-link cutouts .51

Table 1 – Altitude correction factors for insulation levels.30
Table 2 – Altitude correction factors for temperature rise .30
Table 3 – Rated voltages .31
Table 4 – Rated insulation levels (Series I).32
Table 5 – Rated insulation levels (Series II).33
Table 6 – Test parameters .34
Table 7 – Values of circuit-power factor for test duty 4.35
Table 8 – Standardized values of transient recovery voltage for test duties 1, 2 , 3 and 4
– Class A fuses – Representation by two parameters – Tests at rated voltage .36
Table 9 – Standardized values of transient recovery voltage for test duties 1, 2, 3 and 4 –
Class B fuses – Representation by two parameters – Tests at rated voltage .37
Table 10 – Limit values for pre-arcing time-current characteristics – Fuse-links
designated type K .38
Table 11 – Limit values for pre-arcing time-current characteristics – Fuse-links
designated type T .39
Table 12 − Temperature and temperature-rise limit values of parts and materials .40
Table 13 – Dielectric tests (where the terminal opposite the energized terminal is
earthed when testing the base with the fuse-link removed) .41
Table 14 – Size of the conductors for the temperature-rise tests.41

– 4 – 60282-2 © IEC:2008
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HIGH-VOLTAGE FUSES –
Part 2: Expulsion fuses
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 provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
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 60282-2 has been prepared by subcommittee 32A: High-voltage
fuses, of IEC technical committee 32: Fuses.
This third edition cancels and replaces the second edition, published in 1995, and constitutes
a technical revision.
The main changes with regard to the previous edition concern the following:
– Class C has been eliminated;
– TRV values have been reviewed and, where appropriate, harmonized with
IEC 62271-100:2001, its amendment 1 (2002) and amendment 2 (2006);
– tests for non-ceramic insulators have been included;
– a lightning surge impulse withstand test for fuse-links has been included;
– an homogeneous series has been redefined.

60282-2 © IEC:2008 – 5 –
The text of this standard is based on the following documents:
FDIS Report on voting
32A/261/FDIS 32A/264/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 the parts in the IEC 60282 series, under the general title High-voltage fuses, can
be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result 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 – 60282-2 © IEC:2008
HIGH-VOLTAGE FUSES –
Part 2: Expulsion fuses
1 Scope
This part of IEC 60282 specifies requirements for expulsion fuses designed for use outdoors
or indoors on alternating current systems of 50 Hz and 60 Hz, and of rated voltages
exceeding 1 000 V.
Expulsion fuses are fuses in which the arc is extinguished by the expulsion effects of the
gases produced by the arc.
Expulsion fuses are classified according to the TRV (transient recovery voltage) capability in
classes A and B.
This standard covers only the performance of fuses, each one comprising a specified
combination of fuse-base, fuse-carrier and fuse-link which have been tested in accordance
with this standard; successful performance of other combinations cannot be implied from this
standard.
This standard may also be used for non-expulsion fuses in which the interruption process
waits for natural current zero to clear the circuit.
NOTE 1 See Clause 5 and Clause 12 for specific information regarding the selection of fuse class.
NOTE 2 Fuses required for the protection of capacitors and for transformer circuit applications are subject to
additional requirements (see IEC 60549 [1] or IEC 60787 [2]).
NOTE 3 This standard does not cover load-switching nor fault-making capabilities. Information regarding
requirements related to switching capabilities may be found in IEC 60265-1 [3].
NOTE 4 This standard does not cover aspects related to the level of noise, nor the emission of hot gases inherent
to some types of expulsion fuses during the process of interruption of fault currents.
2 Normative references
The following referenced documents are indispensable for the application 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 60060-1:1989, High-voltage test techniques − Part 1: General definitions and test
requirements
IEC 60071-1:2006, Insulation coordination − Part 1: Definitions, principles and rules
IEC 60694:1996, Common clauses for high-voltage switchgear and controlgear standards
Amendment 1 (2000)
Amendment 2 (2001)
IEC 60815:1986, Guide for the selection of insulators in respect of polluted conditions
IEC 60898-1:2002, Electric accessories – Circuit-breakers for overcurrent protection for
household and similar installations – Part 1: Circuit-breakers for a.c. operation
IEC 61109:1992, Composite insulators for a.c. overhead lines with a nominal voltage greater
than 1 000 V – Definitions, test methods and acceptance criteria
___________
References in square brackets refer to the bibliography.
IEC 60694, together with its 2 amendments, have since been withdrawn and replaced by IEC 62271-1:2007[4].

60282-2 © IEC:2008 – 7 –
IEC 61952:2002, Insulators for overhead lines – Composite line post insulators for alternative
current with a nominal voltage > 1 000 V
IEC 62271-100:2001, High-voltage switchgear and controlgear – Part 100: High-voltage
alternating-current circuit-breakers
Amendment 1 (2002)
Amendment 2 (2006)
3 Terms and definitions
For the purposes of this document the following terms and definitions apply.
NOTE Certain terms, are taken from IEC 60050-151 [5] and IEC 60050- 441 [6], as indicated by the reference
numbers in brackets.
3.1 Electrical characteristics
3.1.1
rated value
quantity value assigned, generally by the manufacturer, for a specified operating condition of
a component, device or equipment
[IEV 151-04-03,modified]
NOTE Examples of rated values usually stated for fuses: voltage, current, breaking capacity.
[IEV 441-18-35]
3.1.2
rating
set of rated values and operating conditions
[IEV 151-04-04]
[IEV 441-18-36]
3.1.3
prospective current (of a circuit and with respect to a fuse)
current that would flow in the circuit if each pole of the switching device or the fuse were
replaced by a conductor of negligible impedance
NOTE The method to be used to evaluate and to express the prospective current is to be specified in the relevant
publications.
[IEV 441-17-01]
3.1.4
prospective peak current
peak value of a prospective current during the transient period following initiation
NOTE The definition assumes that the current is made by an ideal switching device, i.e. with instantaneous
transition from infinite to zero impedance. For circuits where the current can follow several different paths, e.g.
polyphase circuits, it further assumes that the current is made simultaneously in all poles, even if only the current
in one pole is considered.
[IEV 441-17-02]
3.1.5
prospective breaking current
prospective current evaluated at a time corresponding to the instant of the initiation of the
breaking process
___________
The terms cited from IEC 60050-151 are from the first edition (1978). A second edition which cancels and
replaces the first edition, was published in 2001.

– 8 – 60282-2 © IEC:2008
NOTE Specifications concerning the instant of the initiation of the breaking process are to be found in the
relevant publications. For mechanical switching devices or fuses, it is usually defined as the moment of initiation of
the arc during the breaking process.
[IEV 441-17-06]
3.1.6
breaking capacity
value of prospective current that a switching device or a fuse is capable of breaking at stated
voltage under prescribed conditions of use and behaviour
NOTE 1 The voltage to be stated and the conditions to be prescribed are dealt with in the relevant publications.
NOTE 2 For switching devices, the breaking capacity may be termed according to the kind of current included in
the prescribed conditions, e.g. line-charging breaking capacity, cable charging breaking capacity, single capacitor
bank breaking capacity, etc.
[IEV 441-17-08]
3.1.7
pre-arcing time
melting time
interval of time between the beginning of a current large enough to cause a break in the fuse-
element(s) and the instant when an arc is initiated
[IEV 441-18-21]
3.1.8
arcing time
interval of time between the instant of the initiation of the arc in a pole or a fuse and the
instant of final arc extinction in that pole or that fuse
[IEV 441-17-37]
3.1.9
operating time
total clearing time
sum of the pre-arcing time and the arcing time
[IEV 441-18-22]
3.1.10
Joule integral
I t
t
2 2
integral of the square of the current over a given time interval: I t = i tdt
∫
t
2 2
NOTE 1 The pre-arcing I t is the I t integral extended over the pre-arcing time of the fuse.
2 2
NOTE 2 The operating I t is the I t integral extended over the operating time of the fuse.
NOTE 3 The energy in joules liberated in 1 Ω of resistance in a circuit protected by a fuse is equal to the numerical
2 2
value of the operating I t expressed in A .s.
[IEV 441-18-23]
3.1.11
virtual time
value of the Joule integral divided by the square of the value of the prospective current
NOTE The values of virtual times usually stated for a fuse-link in the scope of this standard are the values of the
pre-arcing time.
3.1.12
time-current characteristic
curve giving the time, e.g. pre-arcing time or operating time, as a function of the prospective
current under stated conditions of operation

60282-2 © IEC:2008 – 9 –
[IEV 441-17-13]
3.1.13
recovery voltage
voltage which appears across the terminals of a pole of a switching device or a fuse after the
breaking of the current
NOTE This voltage may be considered in two successive intervals of time, one during which a transient voltage
exists, followed by a second one during which the power frequency or the steady-state recovery voltage alone
exists.
[IEV 441-17-25]
3.1.14
transient recovery voltage
TRV
recovery voltage during the time in which it has a significant transient character
NOTE 1 The transient recovery voltage may be oscillatory or non-oscillatory or a combination of these depending
on the characteristics of the circuit and the switching device. It includes the voltage shift of the neutral of a
polyphase circuit.
NOTE 2 The transient recovery voltages in three-phase circuits is, unless otherwise stated, that across the first
pole to clear, because this voltage is generally higher than that which appears across each of the other two poles.
[IEV 441-17-26]
3.1.15
power-frequency recovery voltage
recovery voltage after the transient voltage phenomena have subsided
[IEV 441-17-27]
3.1.16
prospective transient recovery voltage (of a circuit)
the transient recovery voltage following the breaking of the prospective symmetrical current
by an ideal switching device
NOTE The definition assumes that the switching device or the fuse, for which the prospective transient recovery
voltage is sought, is replaced by an ideal switching device, i.e. having instantaneous transition from zero to infinite
impedance at the very instant of zero current, i.e. at the “natural” zero. For circuits where the current can follow
several different paths, e.g. a polyphase circuit, the definition further assumes that the breaking of the current by
the ideal switching device takes place only in the pole considered.
[IEV 441-17-29]
3.2 Fuses and their component parts (see Figure 1)
3.2.1
fuse
device that by the fusing of one or more of its specially designed and proportioned
components, opens the circuit in which it is inserted by breaking the current when this
exceeds a given value for a sufficient time. The fuse comprises all the parts that form the
complete device
]
[IEV 441-18-01
3.2.2
terminal (as a component)
conductive part of a device, electric circuit or electric network, provided for connecting that
device, electric circuit or electric network to one or more external conductors
NOTE The term "terminal" is also used for a connection point in circuit theory
[IEV 151-12-12]
– 10 – 60282-2 © IEC:2008
3.2.3
fuse-base
fuse-mount
fixed part of a fuse provided with contacts and terminals
[IEV 441-18-02]
3.2.4
fuse-base contact
contact piece of a fuse-base designed to engage with a corresponding part of the fuse
[IEV 441-18-03]
3.2.5
fuse-carrier
movable part of a fuse designed to carry a fuse-link
[IEV 441-18-13]
3.2.6
fuse-carrier contact
contact piece of a fuse-carrier designed to engage with a corresponding part of the fuse
[IEV 441-18-05]
3.2.7
fuse-holder
combination of a fuse-base with its fuse-carrier
[IEV 441-18-14]
3.2.8
fuse-link
part of a fuse (including the fuse-element(s)) intended to be replaced after the fuse has
operated
[IEV 441-18-09]
3.2.9
fuse-link contact
contact piece of a fuse-link designed to engage with a corresponding part of the fuse
[IEV 441-18-04]
3.2.10
fuse-element
part of the fuse-link designed to melt under the action of current exceeding some definite
value for a definite period of time
[IEV 441-18-08]
3.2.11
renewable fuse-link
fuse-link that, after operation, may be restored for service by a refill-unit
[IEV 441-18-16]
3.2.12
refill unit
set of replacement parts intended to restore a fuse-link to its original condition after an
operation
[IEV 441-18-15]
60282-2 © IEC:2008 – 11 –
3.3 Additional terms
3.3.1
expulsion fuse
fuse in which operation is accomplished by expulsion of gases produced by the arc
[IEV 441-18-11]
3.3.2
drop-out fuses
fuse in which the fuse-carrier automatically drops into a position providing an isolating
distance after the fuse has operated
[IEV 441-18-07]
3.3.3
homogeneous series (of fuse-link)
series of fuse-links, deviating from each other only in such characteristics that, for a given
test, the testing of one or a reduced number of particular fuse-link(s) of that series may be
taken as representative for all the fuse-links of the homogeneous series.
NOTE The relevant publications specify the characteristics by which the fuse-links of a homogeneous series may
deviate, the particular fuse-links to be tested and the specific test concerned.
[IEV 441-18-34]
NOTE See also 8.6.1.2, 8.6.1.4 and 8.6.3.1.
3.3.4
isolating distance (for a fuse)
shortest distance between the fuse-base contacts or any conductive parts connected thereto,
measured on a fuse:
a) for a drop-out fuse, with the fuse-carrier in drop-out position;
b) for fuses that are not drop-out fuses, with the fuse-link or the renewable fuse-link
removed.
[IEV 441-18-06, modified]
3.3.5
speed designation of fuse-links (for expulsion fuses)
designation, expressed by letters such as K or T associated with the ratio between the values
of the pre-arcing currents at two specified values of pre-arcing times
NOTE 1 K or T are letters typically used for speed designation.
NOTE 2 Pre-arcing times are usually declared for 0,1 s and 300 s (or 600 s).
NOTE 3 Fuse-links are typically designated by their rated current followed by their speed designation, e.g. a
125 K fuse-link is a 125 A rated fuse-link of speed designation type K.
3.3.6
interchangeability of fuse-links
compatibility of dimensions and pre-arcing time-current characteristics between different
manufacturer's expulsion fuse-links, permitting use of such fuse-links in fuse-carriers of
alternative manufacturers, without significant alteration of the pre-arcing time-current
characteristics
NOTE It should be noted that the protective and interrupting performance provided by the combination of the
selected fuse-link and the selected fuse-carrier can only be assured by performance test on the specific
combination.
3.3.7
distribution fuse-cutout
drop-out fuse comprising a fuse-base, a fuse-carrier lined with arc-quenching material, and a
fuse-link having a flexible tail, and a small diameter arc-quenching tube surrounding the fuse-
element
– 12 – 60282-2 © IEC:2008
3.3.8
open-link cutout
expulsion-fuse that does not employ a fuse-carrier and, in which the fuse-base directly
receives an open-link fuse-link or a disconnecting blade
3.3.9
open-link fuse-link
replaceable part or assembly comprising the fuse-element and fuse tube, together with the
parts necessary to confine and aid in extinguishing the arc and the parts to connect it directly
into the fuse clips of the open-link cutout fuse-base
4 Service conditions
4.1 Normal service conditions
Fuses complying with this standard are designed to be used under the following conditions:
a) The maximum ambient air temperature is 40 °C and its mean measured over a period of
24 h does not exceed 35 °C. The total solar radiation does not exceed 1 kW/m :
− for indoor installations, the preferred values of minimum ambient air temperature are
–5 °C, –15 °C and –25 °C;
− for outdoor installations, the preferred values of minimum ambient air temperature
are –10 °C, –25 °C, –30 °C and –40 °C.
NOTE 1 Attention is drawn to the fact that the time-current characteristics may be influenced by changes in
ambient temperature.
b) The pollution level as classified in Clause 3 of IEC 60815 does not exceed the pollution
level II – Medium according to Table 1 of IEC 60815.
c) For indoor installations, only normal condensation is present.
d) For outdoor installations, the wind pressure does not exceed 700 Pa (corresponding to
34 m/s wind speed).
e) The altitude does not exceed 1 000 m.
NOTE 2 When fuses are required for use above 1 000 m, the rated insulation levels to be specified should be
determined by multiplying the standard insulation levels given in Tables 4 and 5 by the appropriate correction
factors given in Table 1, or reducing overvoltages by using appropriate overvoltage limiting devices.
NOTE 3 The rated current of the equipment or the temperature rise specified in Table 12 can be corrected for
altitudes exceeding 1 000 m by using appropriate factors given in Table 2, columns 2 and 3 respectively. Use
one correction factor from columns 2 or 3, but not both for any one application.
4.2 Special service conditions
By agreement between manufacturer and user, high-voltage fuses may be used under
conditions different from the conditions given in 4.1.
For any special service condition, the manufacturer shall be consulted.
5 Classification and designation
5.1 Classification
For a given rating, two classes of expulsion fuses are defined according to their ability to
comply with the TRV requirements of the following tables for test duties 1, 2, 3 and 4 (see
Annex A for guidance on correct application):
a) Class A − Table 8;
b) Class B − Table 9.
NOTE 1 These classes are approximately in line with the TRV requirements in the following standards:
− Class A: IEC 60282-2 (1970) [7] : (Class 2 fuses), and IEEE C37.41 (distribution class fuse-cutouts) [8];
___________
First edition now withdrawn and replaced by more recent editions.

60282-2 © IEC:2008 – 13 –
− Class B: IEC 60282-2 (1970): (Class 1 fuses), and IEEE C37.41 (power class fuses).
NOTE 2 Parameters used to define TRV are described in Figures 6 and 7.
5.2 Fuse-link speed designation
Certain types of fuse-link are designated as, e.g. "type T" or "type K", according to their
compliance with specific pre-arcing time-current characteristics.
Such designation may assist in allowing interchangeability (see 3.3.8) between alternative
manufacturer's fuse-links for use in distribution fuse-cutouts.
a) Designation type K: high-speed fuse-links with pre-arcing time-current characteristics in
accordance with Table 10.
b) Designation type T: low-speed fuse-links with pre-arcing time-current characteristics in
accordance with Table 11.
6 Ratings
6.1 General
The ratings of the fuse and its classification according to 5.1 are based on the defined
working conditions for which it is designed and constructed. These ratings are as follows:
a) Fuse (complete)
– Rated voltage (see 6.2);
– Rated current (see 6.3);
– Rated frequency (see 6.4);
– Rated breaking capacity (see 6.5);
– Rated insulation level (see 6.6).
b) Fuse-base
– Rated voltage (see 6.2);
– Rated current (see 6.3);
– Rated insulation level (see 6.6).
c) Fuse-carrier
– Rated voltage (see 6.2);
– Rated current (see 6.3);
– Rated frequency (see 6.4);
– Rated breaking capacity (see 6.5).
d) Fuse-link
– Rated voltage (see 6.2);
– Rated current (see 6.3).
6.2 Rated voltage
A voltage used in the designation of the fuse, fuse-base, fuse-carrier, or fuse-link from which
the test conditions are determined.
The rated voltage shall be selected from the voltages given in Table 3.
NOTE This rated voltage is equal to the highest voltage for the equipment.
Two series of highest voltages for equipment are given in Table 3; one for 50 Hz and 60 Hz
systems (series I), and the other for 60 Hz systems (series II − North American practice). It is
recommended that only one of these series should be used in any one country.

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6.3 Rated current
6.3.1 General
The rated current shall be the current used in the designation of the fuse, fuse-base, fuse-
carrier, or fuse-link from which the test conditions are determined.
The rated current should be selected from the R10 series.
n
NOTE The R10 series comprise the numbers: 1 – 1,25 – 1,6 – 2 – 2,5 – 3,15 – 4 – 5 – 6,3 - 8 and their multiples of 10 .
6.3.2 Fuse (complete)
The rated current of the fuse shall be equal to the rated current of the fuse-link included
therein.
6.3.3 Fuse-base
The rated current assigned to a fuse-base shall be the maximum current that a new clean
fuse-base will carry continuously, without exceeding specified temperatures and temperature
rises, when equipped with a fuse-carrier and a fuse-link of the same current rating designed
to be used in the particular fuse-base, and connected to the circuit with certain specified
conductor sizes and lengths, at an ambient temperature of not more than 40 °C.
The preferred values of the rated current of the fuse-base are
50 − 100 − 200 − 315 − 400 − 630 A.
6.3.4 Fuse-carrier
The rated current assigned to a fuse-carrier shall be the maximum current that a new fuse-
carrier, fitted with a fuse-link of the same rated current, will carry continuously, without
exceeding specified temperatures and temperature rises, when mounted on a fuse-base
specified by the manufacturer at an ambient temperature of not more than 40 °C.
6.3.5 Fuse-link
The rated current assigned to a fuse-link shall be the maximum current that a new fuse-link
will carry continuously, without exceeding specified temperatures and temperature rises,
when mounted on a fuse-base and, if applicable, within a fuse-carrier specified by the
manufacturer, at ambient temperature of not more than 40 °C.
The following ratings for fuse-links designated type K and type T are recommended:
− preferred ratings (in amperes): 6,3 − 10 − 16 − 25 − 40 − 63 − 100 − 160 − 200;
− intermediate ratings (in amperes): 8 − 12,5 − 20 − 31,5 − 50 − 80.
NOTE In some countries, values of 1 − 2 − 3 − 6 − 12 − 15 − 30 − 65 and 140 A are also used.
6.4 Rated frequency
The rated frequency shall be the power frequency for which the fuse has been designed and
to which the values of other characteristics correspond.
Standardized values of rated frequency are 50 Hz, 50/60 Hz and 60 Hz.
6.5 Rated breaking capacity
The rated breaking capacity assigned to a fuse and a fuse-carrier shall be the maximum
breaking current in kiloamperes r.m.s. symmetrical specified when tested in accordance with
this standard.
6.6 Rated insulation level (of a fuse or fuse-base)
The rated insulation level shall be selected from the values of voltage (both power-frequency
and impulse) given in Tables 4 and 5.
In these tables, the withstand voltage applies at the standardized reference atmosphere,
temperature (20 °C), pressure (101,3kPa) and humidity (11 g/m ), specified in IEC 60071-1.

60282-2 © IEC:2008 – 15 –
NOTE Two levels of dielectric withstand are recognized for a fuse-base according to IEC practices. These are
termed "List 1" and "List 2", and relate to different severities of application, and corresponding different values of
test voltages for the dielectric tests. See IEC 60071-2 [9].
The rated withstand voltage values for lightning impulse voltage (U ) and power-frequency
p
voltage (U ) shall be selected without crossing the horizontal marked lines. The rated
d
insulation level of a fuse or a fuse-base is specified by the rated lightning impulse withstand
voltage phase to earth, according to Tables 4 or 5.
The withstand values “across the isolating distance” are valid only for fuse-bases where the
clearance between open contacts is designed to meet the safety requirements specified for
disconnectors.
Rated insulation levels may also be selected from values higher than those corresponding to
the rated voltage of the fuse or fuse-base.
It shall be stated whether the fuse-cutout is suitable for indoor and/or outdoor service.
7 Standard conditions of use and behaviour
7.1 Standard conditions of use with respect to breaking capacity
Fuses shall be capable of breaking correctly any value of prospective current, irrespective of
the possible d.c. component, provided that:
− the a.c. component is not higher than the rated breaking capacity;
− the prospective transient recovery voltage and its rate of rise are not higher than those
specified in Tables 8 and 9 for the relevant classes A and B;
− the power-frequency recovery voltage is not higher than that specified in Table 6 (for
special conditions, see 12.3.3 and 12.3.4);
− the frequency is between 48 Hz and 62 Hz for fuses rated 50 Hz and 50/60 Hz, and
between 58 Hz and 62 Hz for fuses rated 60 Hz;
− the power factor is not lower than that specified in Tables 6 and 7.
When used in systems with voltages less than the rated voltage of the fuse, the breaking
capacity in kiloamperes is not less than the rated breaking capacity.
7.2 Standard conditions of behaviour with respect to breaking capacity
According to the conditions of use indicated in 7.1, the behaviour of the fuse shall be as
follows:
a) Flashovers shall not occur during operation. It is the responsibility of the fuse
manuf
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