EN 60282-1:2009

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Visokonapetostne varovalke - 1. del: Tokovno omejilne varovalke (IEC 60282-1:2009)Hochspannungssicherungen - Teil 1: Strombegrenzende Sicherungen (IEC 60282-1:2009)Fusibles à haute tension - Partie 1: Fusibles limiteurs de courant (CEI 60282-1:2009)High-voltage fuses - Part 1: Current-limiting fuses (IEC 60282-1:2009)29.120.50Fuses and other overcurrent protection devicesICS:Ta slovenski standard je istoveten z:EN 60282-1:2009SIST EN 60282-1:2010en,fr01-marec-2010SIST EN 60282-1:2010SLOVENSKI
STANDARD
EUROPEAN STANDARD EN 60282-1 NORME EUROPÉENNE
EUROPÄISCHE NORM December 2009
CENELEC European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: Avenue Marnix 17, B - 1000 Brussels
© 2009 CENELEC -
All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60282-1:2009 E
ICS 29.120.50 Supersedes EN 60282-1:2006
English version
High-voltage fuses -
Part 1: Current-limiting fuses (IEC 60282-1:2009)
Fusibles à haute tension -
Partie 1: Fusibles limiteurs de courant (CEI 60282-1:2009)
Hochspannungssicherungen -
Teil 1: Strombegrenzende Sicherungen (IEC 60282-1:2009)
This European Standard was approved by CENELEC on 2009-11-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom.
Foreword The text of document 32A/274/FDIS, future edition 7 of IEC 60282-1, prepared by SC 32A, High-voltage fuses, of IEC TC 32, Fuses, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60282-1 on 2009-11-01. This European Standard supersedes EN 60282-1:2006. The changes introduced by this new edition are only editorial. The following dates were fixed: – latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement
(dop)
2010-08-01 – latest date by which the national standards conflicting
with the EN have to be withdrawn
(dow)
2012-11-01 Annex ZA has been added by CENELEC. __________ Endorsement notice The text of the International Standard IEC 60282-1:2009 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the following notes have to be added for the standards indicated: IEC/TR 60890 NOTE
Harmonized as CLC/TR 60890:2002 (not modified). IEC 62271-1 NOTE
Harmonized as EN 62271-1:2008 (not modified). IEC 62271-100 NOTE
Harmonized as EN 62271-100:2009 (not modified). __________ SIST EN 60282-1:2010

- 3 - EN 60282-1:2009 Annex ZA
(normative)
Normative references to international publications with their corresponding European publications
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.
NOTE
When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies.
Publication Year Title EN/HD Year
IEC 60060-1 1989 High-voltage test techniques -
Part 1: General definitions and test requirements HD 588.1 S1 1991
IEC 60071-1 2006 Insulation co-ordination -
Part 1: Definitions, principles and rules EN 60071-1 2006
IEC 60085 2007 Electrical insulation -
Thermal evaluation and designation EN 60085 2008
IEC 60265-1 1998 High-voltage switches -
Part 1: Switches for rated voltages above 1 kV and less than 52 kV EN 60265-1 1998
IEC 60549 1976 High-voltage fuses for the external protection of shunt power capacitors - -
IEC 60644 1979 Specification for high-voltage fuse-links for motor circuit applications EN 60644 1993
IEC/TR 60787 2007 Application guide for the selection of
high-voltage current-limiting fuse-links for transformer circuits - -
IEC 62271-105 2002 High-voltage switchgear and controlgear -
Part 105: Alternating current switch-fuse combinations EN 62271-105 2003
ISO 148-2 -1) Metallic materials - Charpy pendulum impact test -
Part 2: Verification of test machines EN ISO 148-2 20082)
ISO 179 Series Plastics -
Determination of Charpy impact properties EN ISO 179 Series
1) Undated reference. 2) Valid edition at date of issue. SIST EN 60282-1:2010

IEC 60282-1Edition 7.0 2009-10INTERNATIONAL STANDARD NORME INTERNATIONALEHigh-voltage fuses –
Part 1: Current-limiting fuses
Fusibles à haute tension –
Partie 1: Fusibles limiteurs de courant
INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE XCICS 29.120.50 PRICE CODECODE PRIXISBN 2-8318-1064-6
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CONTENTS FOREWORD.6 1 General.8 1.1 Scope.8 1.2 Normative references.8 2 Normal and special service conditions.8 2.1 Normal service conditions.8 2.2 Other service conditions.10 2.3 Special service conditions.10 2.4 Environmental behaviour.10 3 Terms and definitions.10 3.1 Electrical characteristics.10 3.2 Fuses and their component parts.14 3.3 Additional terms.15 4 Ratings and characteristics.17 4.1 General.17 4.2 Rated voltage.17 4.3 Rated insulation level (of a fuse-base).18 4.4 Rated frequency.19 4.5 Rated current of the fuse-base.19 4.6 Rated current of the fuse-link.19 4.7 Temperature-rise limits.20 4.8 Rated breaking capacity.22 4.8.1 Rated maximum breaking current.22 4.8.2 Rated minimum breaking current and class.22 4.9 Limits of switching voltage.22 4.10 Rated transient recovery voltage (rated TRV).24 4.10.1 General.24 4.10.2 Representation of TRV.25 4.10.3 Representation of rated TRV.25 4.11 Time-current characteristics.26 4.12 Cut-off characteristic.27 4.13 I2t characteristics.27 4.14 Mechanical characteristics of strikers.27 4.15 Special requirement for Back-Up fuses intended for use in switch-fuse combination according to IEC 62271-105.28 4.15.1 General.28 4.15.2 Maximum body temperature under pre-arcing conditions.29 4.15.3 Maximum arcing withstand time.29 5 Design, construction and performance.29 5.1 General requirements with respect to fuse operation.29 5.1.1 General.29 5.1.2 Standard conditions of use.29 5.1.3 Standard conditions of behaviour.30 5.2 Identifying markings.30 5.3 Dimensions.31 6 Type tests.31 SIST EN 60282-1:2010

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6.1 Conditions for making the tests.31 6.2 List of type tests.31 6.3 Common test practices for all type tests.31 6.3.1 General.31 6.3.2 Condition of device to be tested.32 6.3.3 Mounting of fuses.32 6.4 Dielectric tests.32 6.4.1 Test practices.32 6.4.2 Application of test voltage for impulse and power-frequency test.32 6.4.3 Atmospheric conditions during test.33 6.4.4 Lightning impulse voltage dry tests.33 6.4.5 Power-frequency voltage dry tests.33 6.4.6 Power-frequency wet tests.33 6.5 Temperature-rise tests and power-dissipation measurement.34 6.5.1 Test practices.34 6.5.2 Measurement of temperature.35 6.5.3 Measurement of power dissipation.36 6.6 Breaking tests.36 6.6.1 Test practices.36 6.6.2 Test procedure.43 6.6.3 Alternative test methods for Test Duty 3.47 6.6.4 Breaking tests for fuse-links of a homogeneous series.48 6.6.5 Acceptance of a homogeneous series of fuse-links by interpolation.49 6.6.6 Acceptance of a homogeneous series of fuse-links of different lengths.50 6.7 Tests for time-current characteristics.50 6.7.1 Test practices.50 6.7.2 Test procedures.50 6.8 Tests of strikers.51 6.8.1 General.51 6.8.2 Strikers to be tested.51 6.8.3 Operation tests.51 6.8.4 Test performance.52 6.9 Electromagnetic compatibility (EMC).53 7 Special tests.53 7.1 General.53 7.2 List of special tests.53 7.3 Thermal shock tests.53 7.3.1 Test sample.53 7.3.2 Arrangement of the equipment.54 7.3.3 Test method.54 7.4 Power-dissipation tests for fuses not intended for use in enclosures.54 7.5 Waterproof test (ingress of moisture).54 7.5.1 Test conditions.54 7.5.2 Test sample.54 7.5.3 Test method.54 7.6 Tests for Back-Up fuses for use in switch-fuse combination of IEC 62271-105.54 7.6.1 General.54 7.6.2 Pre-arcing temperature rise test.54 7.6.3 Arcing duration withstand test.55 SIST EN 60282-1:2010

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7.7 Oil-tightness tests.55 8 Routine tests.56 9 Application guide.56 9.1 Object.56 9.2 General.56 9.3 Application.56 9.3.1 Mounting.56 9.3.2 Selection of the rated current of the fuse-link.57 9.3.3 Selection according to class (see 3.3.2) and minimum breaking current.58 9.3.4 Selection of the rated voltage of the fuse-link.59 9.3.5 Selection of the rated insulation level.59 9.3.6 Time-current characteristics of high-voltage fuses.60 9.3.7 Fuses connected in parallel.60 9.4 Operation.61 9.4.1 Locking of the fuse-link in the service position.61 9.4.2 Replacement of the fuse-link.61 9.5 Disposal.61 Annex A (normative)
Method of drawing the envelope of the prospective transient recovery voltage of a circuit and determining the representative parameters.62 Annex B (informative)
Reasons which led to the choice of TRV values
for Test Duties 1, 2 and 3.64 Annex C (informative)
Preferred arrangements for temperature-rise tests of
oil-tight fuse-links for switchgear.66 Annex D (informative)
Types and dimensions of current-limiting fuse-links specified in
existing national standards.67 Annex E (normative)
Requirements for certain types of fuse-links intended for use at surrounding temperatures above 40 °C.70 Annex F (informative)
Determination of derating when the ambient temperature of
the fuse exceeds 40 °C.74 Annex G (informative)
Criteria for determining It testing validity.82 Bibliography.83
Figure 1 – Terminology.14 Figure 2 – Permissible switching voltages for fuse-links of small current ratings (Table 8).23 Figure 3 – Representation of a specified TRV by a two-parameters reference line
and a delay line.26 Figure 4 – Various stages of the striker travel.28 Figure 5 – Example of a two-parameters reference line for a TRV complying with
the conditions of the type test.39 Figure 6 – Breaking tests – Arrangement of the equipment.43 Figure 7 – Breaking tests – Typical circuit diagram for Test Duties 1 and 2.44 Figure 8 – Breaking tests – Typical circuit diagram for Test Duty 3.44 Figure 9 – Breaking tests – Interpretation of oscillograms for Test Duty 1.45 Figure 10 – Breaking tests – Interpretation of oscillograms for Test Duty 2 (calibration traces as in a) of Figure 9).46 Figure 11 – Breaking tests – Interpretation of oscillograms for Test Duty 3.46 SIST EN 60282-1:2010

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Figure A.1 – Example of a two-parameters reference line for a TRV whose initial portion is concave towards the left.63 Figure A.2 – Example of a two-parameters reference line for an exponential TRV.63 Figure C.1 – Test tank for temperature-rise tests of oil-tight fuses.66 Figure C.2 – Details of clamping arrangement for fuse-link in the tank.66 Figure F.1 – Derating curves for some allowed temperature limits.78 Figure F.2 – Practical example: dimensions.79 Figure F.3 – Extract from IEC 60890.80 Figure F.4 – Practical example of application.81
Table 1 – Altitude correction factors – Test voltage and rated voltage.9 Table 2 – Altitude correction factors – Rated current and temperature rise.9 Table 3 – Rated voltages.17 Table 4 – Fuse-base rated insulation levels – Series I.18 Table 5 – Fuse-base rated insulation levels – Series II.19 Table 6 – Limits of temperature and temperature rise for components and materials.21 Table 7 – Maximum permissible switching voltages.22 Table 8 – Maximum permissible switching voltages for
certain fuse-links of small current ratings.23 Table 9 – Standard values of rated TRV – Series I.24 Table 10 – Standard values of rated TRV – Series II.25 Table 11 – Mechanical characteristics of strikers.28 Table 12 – Electrical connection to the test circuit – Conductor sizes.34 Table 13 – Breaking tests – Parameters.38 Table 14 – TRV for Test Duty 2 – Series I.40 Table 15 – TRV for Test Duty 2 – Series II.41 Table 16 – Breaking test requirements for fuse-links of a homogeneous series.49 Table F.1 – Temperature limits extracted from Table 6.77
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INTERNATIONAL ELECTROTECHNICAL COMMISSION ____________
HIGH-VOLTAGE FUSES –
Part 1: Current-limiting 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 Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end user. 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any services carried out by independent certification bodies. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 60282-1 has been prepared by subcommittee 32A: High-voltage fuses, of IEC technical committee 32: Fuses. This seventh edition cancels and replaces the sixth edition published in 2005. The changes introduced by this new edition are only editorial. The text of this standard is based on the following documents: FDIS Report on voting 32A/274/FDIS 32A/277/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. SIST EN 60282-1:2010

60282-1 © IEC:2009 – 7 –
A list of all parts of 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.
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HIGH-VOLTAGE FUSES –
Part 1: Current-limiting fuses
1 General 1.1 Scope This part of IEC 60282 applies to all types of high-voltage current-limiting 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. Some fuses are provided with fuse-links equipped with an indicating device or a striker. These fuses come within the scope of this standard, but the correct operation of the striker in combination with the tripping mechanism of the switching device is outside the scope of this standard; see IEC 62271-105. 1.2 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 co-ordination – Part 1: Definitions, principles and rules
IEC 60085:2007, Electrical insulation – Thermal evaluation and designation IEC 60265-1:1998, High-voltage switches – Part 1: Switches for rated voltages above 1 kV and less than 52 kV IEC 60549:1976, High-voltage fuses for the external protection of shunt power capacitors IEC 60644:1979, Specification for high-voltage fuse-links for motor circuit applications IEC/TR 60787:2007, Application guide for the selection of high-voltage current-limiting fuse-links for transformer circuits
IEC 62271-105:2002, High-voltage switchgear and controlgear – Part 105: Alternating current switch-fuse combinations
ISO 148-2, Metallic materials – Charpy pendulum impact test – Part 2: Verification of test machines ISO 179 (all parts), Plastics – Determination of Charpy impact properties 2 Normal and special service conditions
2.1 Normal service conditions Fuses complying with this standard are designed to be used under the following conditions. SIST EN 60282-1:2010

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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 minimum ambient air temperature is –25 °C. NOTE 1 The time-current characteristics of fuses will be modified at the minimum and maximum temperatures. b) The altitude does not exceed 1 000 m.
NOTE 2 The rated voltages and insulation levels specified in this standard apply to fuses intended for use at altitudes not exceeding 1 000 m. When fuses incorporating external insulation are required for use at altitudes above 1 000 m, one or other of the following procedures should be adopted. a) The test voltages for insulating parts in air should be determined by multiplying the standard test voltages given in Tables 4 and 5 by the appropriate correction factor given in column (2) of Table 1. b) The fuses may be selected with a rated voltage which, when multiplied by the appropriate correction factor given in column (3) of Table 1 is not lower than the highest voltage of the system.
For altitudes between 1 000 m and 1 500 m and between 1 500 m and 3 000 m, the correction factors can be obtained by linear interpolation between the values in Table 1. Table 1 – Altitude correction factors – Test voltage and rated voltage Maximum altitude m
(1) Correction factor for test voltages referred to sea-level (2) Correction factor for rated voltages
(3) 1 000 1 500 3 000
1,0
1,05
1,25
1,0
0,95
0,80
Where the dielectric characteristics are identical at any altitude, no special precautions need to be taken. NOTE 3 The rated current or the temperature rise specified in this standard can be corrected for altitudes exceeding 1 000 m by using the 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. For altitudes between 1 000 m and 1 500 m and between 1 500 m and 3 000 m, the correction factors can be obtained by linear interpolation between the values in Table 2. Table 2 – Altitude correction factors – Rated current and temperature rise Maximum altitude m (1) Correction factor for rated current (2) Correction factor for temperature rise (3) 1 000 1 500 3 000
1,0
0,99
0,96
1,0
0,98
0,92
c) The ambient air is not excessively (or abnormally) polluted by dust, smoke, corrosive or flammable gases, vapour or salt. d) For indoor installations, the conditions of humidity are under consideration but, in the meantime, the following figures can be used as a guidance: – the average value of the relative humidity, measured during a period of 24 h, does not exceed 95 %; – the average value of the vapour pressure, for a period of 24 h, does not exceed 22 hPa; – the average value of the relative humidity, for a period of one month, does not exceed 90 %; SIST EN 60282-1:2010

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– the average value of the water vapour pressure, for a period of one month, does not exceed 18 hPa.
For these conditions, condensation may occasionally occur. NOTE 4 Condensation can be expected where sudden temperature changes occur in periods of high humidity. NOTE 5 To withstand the effects of high humidity and occasional condensation, such as breakdown of in-sulation or corrosion of metallic parts, indoor fuses designed for such conditions and tested accordingly or outdoor fuses may be used. NOTE 6 Condensation may be prevented by special design of the building or housing, by suitable ventilation and heating of the station or by the use of dehumidifying equipment. e) Vibrations due to causes external to fuses or earth tremors are negligible. In addition, for outdoor installations, f) account should be taken of the presence of condensation or rain and rapid temperature changes; g) the wind pressure does not exceed 700 Pa (corresponding to 34 m/s wind speed); h) the solar radiation does not exceed 1,1 kW/m2. 2.2 Other service conditions Fuse-links intended for use at surrounding temperatures (see 3.3.11) above 40 °C are covered in this standard in Annex E. 2.3 Special service conditions By agreement between the manufacturer and the user, high-voltage fuses may be used under conditions different from the normal service conditions given in 2.1. For any special service condition, the manufacturer shall be consulted. 2.4 Environmental behaviour Fuses complying with this standard are inert devices during normal service. It is also a requirement of 5.1.3 that no significant external emission takes place. Therefore, they are regarded as environmentally safe devices in service and operation. 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 Electrical characteristics 3.1.1
rated value value of a quantity used for specification purposes, established for a specified set of operating conditions of a component, device, equipment, or system
NOTE Examples of rated values usually stated for fuses, voltage, current and breaking current. [IEV 441-18-35 modified] 3.1.2
rating set of rated values and operating conditions
[IEV 441-18-36] SIST EN 60282-1:2010

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3.1.3
prospective current (of a circuit and with respect to a fuse) current that would flow in the circuit if the fuse were replaced by a conductor of negligible impedance
NOTE For the method to evaluate and to express the prospective current, see 6.6.2.1 and 6.6.2.2. [IEV 441-17-01, modified] 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, for example 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
NOTE For the fuses, this instant is usually defined as the moment of the initiation of the arc during the breaking process. Conventions relating to the instant of the initiation of the arc are given in 6.6.2.3. [IEV 441-17-06] 3.1.6
breaking capacity value of prospective current that a fuse is capable of breaking at a stated voltage under prescribed conditions of use and behaviour [IEV 441-17-08, modified] 3.1.7
cut-off current let-through current
maximum instantaneous value of current attained during the breaking operation of a fuse
NOTE This concept is of particular importance when the fuse operates in such a manner that the prospective peak current of the circuit is not reached. [IEV 441-17-12, modified] 3.1.8
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] 3.1.9
arcing time interval of time between the instant of the initiation of the arc in a fuse and the instant of final arc extinction in that fuse
[IEV 441-17-37, modified] SIST EN 60282-1:2010

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3.1.10
operating time total clearing time sum of the pre-arcing time and the arcing time
[IEV 441-18-22] 3.1.11
Joule integral I2t integral of the square of the current over a given time interval t0 – t1 I2t =
ittt201d∫ NOTE 1 The pre-arcing I2t is the I2t integral extended over the pre-arcing time of the fuse. NOTE 2 The operating I2t is the I2t 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 value of the operating I2t expressed in A2 × s. [IEV 441-18-23 modified] 3.1.12
virtual time value of 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 are the values of pre-arcing time and of operating time. [IEV 441-18-37 modified] 3.1.13
time-current characteristic curve giving the time, for example pre-arcing time or operating time, as a function of the prospective current under stated conditions of operation
[IEV 441-17-13] 3.1.14
cut-off (current) characteristic let-through (current) characteristic curve giving the cut-off current as a function of the prospective current, under stated conditions of operation
NOTE In the case of a.c., the values of the cut-off currents are the maximum values which can be reached whatever the degree of asymmetry. In the case of d.c., the values of the cut-off current are the maximum values reached related to the time-constant as specified. [IEV 441-17-14] 3.1.15
recovery voltage voltage which appears across the terminals of 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, modified] SIST EN 60282-1:2010

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3.1.16
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 fuse. It includes the voltage shift of the neutral point of a polyphase circuit. NOTE 2 The transient recovery voltage in three-phase circuits is, unless otherwise stated, that across the first fuse to clear, because this voltage is generally higher than that which appears across each of the other two fuses. [IEV 441-17-26, modified] 3.1.17
power-frequency recovery voltage recovery voltage after the transient voltage phenomena have subsided
[IEV 441-17-27] 3.1.18
prospective transient recovery voltage (of a circuit) transient recovery voltage following the breaking of the prospective symmetrical current by an ideal switching device
NOTE The definition assumes that 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, for example 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, modified] 3.1.19
switching voltage maximum instantaneous value of voltage which appears across the terminals of a fuse during its operation
NOTE The switching voltage may be the arc voltage or may occur during the time of transient recovery voltage. [IEV 441-18-31]
3.1.20
minimum breaking current minimum value of prospective current that a fuse-link is capable of breaking at a stated voltage under prescribed conditions of use and behaviour
[IEV 441-18-29] 3.1.21
power dissipation (in a fuse-link) power released in a fuse-link carrying a stated value of current under prescribed conditions of use and behaviour NOTE Prescribed conditions of use and behaviour usually include a constant r.m.s. value of current until steady temperature conditions are reached. [IEV 441-18-38] SIST EN 60282-1:2010

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3.2 Fuses and their component parts 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 conducting part of a fuse provided for an electric connection to external circuits NOTE Terminals may be distinguished according to the kind of circuits for which they are intended (for example, main terminal, earth terminal, etc.), but also according to their design (for example, screw terminal, plug terminal, etc.). 3.2.3
fuse-base fuse-mount fixed part of a fuse provided with contacts and terminals
NOTE The fuse-base comprises all the parts necessary for insulation (see Figure 1). [IEV 441-18-02]
Terminal Striker or indicating device Fuse element Fuse-link Fuse-base contact Fuse-base Fuse-link contact IEC
1966/05
Figure 1 – Terminology 3.2.4
fuse-base contact contact piece of a fuse-base designed to engage with a fuse-link contact (see Figure 1)
60282-1 © IEC:2009 – 15 –
[IEV 441-18-03, modified] 3.2.5
fuse-link part of a fuse (including the fuse element(s)) intended to be replaced after the fuse has operated (see Figure 1)
[IEV 441-18-09] 3.2.6
fuse-link contact contact piece of a fuse-link designed to engage with a fuse-base contact (see Figure 1)
[IEV 441-18-04, modified] 3.2.7
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 (see Figure 1)
[IEV 441-18-08] 3.2.8
indicating device indicator part of a fuse provided to indicate whether the fuse has operated (see Figure 1)
[IEV 441-18-17] 3.2.9
striker mechanical device forming part of a fuse-link which, when the fuse operates, releases the energy required to ca
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