EN 62271-105:2003

STANDARDVisokonapetostne stikalne naprave – 105. del: Stikala z varovalko za izmenični tok (IEC
62271-105:2002)High-voltage switchgear and controlgear - Part 105: Alternating current switch-fuse combinations (IEC
62271-105:2002)©
Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljenoReferenčna številkaSIST EN 62271-105:2003(en)ICS29.130.10

EUROPEAN STANDARD
EN 62271-105 NORME EUROPÉENNE EUROPÄISCHE NORM
May 2003 CENELEC European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels
© 2003 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 62271-105:2003 E
ICS 29.130.10 Supersedes EN 60420:1993
English version
High-voltage switchgear and controlgear Part 105: Alternating current switch-fuse combinations (IEC 62271-105:2002)
Appareillage à haute tension Partie 105: Combinés
interrupteurs-fusibles
pour courant alternatif (CEI 62271-105:2002)
Hochspannungs-Schaltgeräte
und -Schaltanlagen Teil 105: Hochspannungs-Lastschalter-Sicherungs-Kombinationen (IEC 62271-105:2002)
This European Standard was approved by CENELEC on 2002-10-01. 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, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom.

This European Standard supersedes EN 60420:1993.
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) 2003-12-01
– latest date by which the national standards conflicting with the EN have to be withdrawn
(dow)
2005-10-01
This European Standard is to be used in conjunction with EN 60694:1996 to which it refers and which is applicable, unless otherwise specified. In order to simplify the indication of corresponding requirements, the same numbering of clauses and subclauses is used as in EN 60694. Additional subclauses are numbered from 101.
Annexes designated "normative" are part of the body of the standard.
Annexes designated "informative" are given for information only.
In this standard, annexes
B and ZA are normative and annex A is informative. Annex ZA has been added by CENELEC.
The numbering of the standards falling under the responsibility of IEC/SC 17A and IEC/SC 17C will apply the following principle:
a) Common standards prepared by SC 17A and SC 17C will start with IEC 62271-001; b) Standards of SC 17A will start with IEC 62271-100; c) Standards of SC 17C will start with IEC 62271-200; d) Guides prepared by SC 17A and SC 17C will start with IEC 62271-300.

- 3 - EN 62271-105:2003
The following table provides an overview of the relationship between the old and the new numbering of standards falling under the responsibility of CLC/TC 17A and CLC/TC 17C.
IEC 62271/ EN 62271 High-voltage switchgear and controlgear – Number of previous standard, if any Part Orignal title IEC
EN/HD 1 Common specifications 60694; 60517 EN 60694;
EN 60517
100 High-voltage alternating circuit-breakers 60056 HD 348, mod. 101 Synthetic testing of high-voltage alternating current circuit-breakers 60427 EN 60427 102 Alternating current disconnectors and earthing switches 60129 EN 60129 103 Switches for rated voltages above1 kV and less than 52 kV 60265-1 EN 60265-1 104 High-voltage switches for rated voltages of 52 kV and above 60265-2 EN 60265-2 105 High-voltage alternating current switch-fuse combinations 60420 EN 60420 106 High-voltage alternating current contactors and contactor-based motor-starters 60470 EN 60470 107 High-voltage alternating current switchgear-fuse combinations New -- 108 Switchgear having combined functions New -- 109 Alternating current series capacitor by-pass switches New --
200 A.C. metal-enclosed switchgear and controlgear for rated voltages above 1 kV and up to and including 52 kV 60298 EN 60298 201 A.C.insulation-enclosed switchgear and controlgear for rated voltages above 1 kV and up to and including 38 kV 60466 -- 202 High-voltage/low-voltage prefabricated substations 61330 EN 61330 203 Gas-insulated metal-enclosed switchgear for rated voltages of 72,5 kV and above 60517; 61259 EN 60517; EN 61259 204 Rigid high-voltage gas-insulated transmission lines for rated voltages of 72,5 kV and above 61640 --
300 Guide for seismic qualification of high-voltage alternating current circuit-breakers 61166 EN 61166 301 High-voltage alternating current circuit-breakers - Inductive load switching 61233 -- 302 High-voltage alternating current circuit-breakers - Guide for short-circuit and switching test procedures for metal-enclosed and dead tank circuit-breakers 61633 -- 303 High-voltage switchgear and controlgear - Use and handling of sulphur hexafluoride (SF6) in high-voltage switchgear and controlgear 61634 -- 304 Additional requirements for enclosed switchgear and controlgear from 1 kV to 72,5 kV to be used in severe climatic conditions 60932 -- 305 Cable connections for gas-insulated metal-enclosed switchgear for rated voltages of 72,5 kV and above - Fluid-filled and extruded insulation cables - Fluid-filled and dry type cable-terminations 60859 -- 306 Direct connection between power transformers and gas-insulated metal-enclosed switchgear for rated voltages of 72,5 kV and above 61639 -- 307 High-voltage switchgear and controlgear - The use of electronic and associated technologies in auxiliary equipment of switchgear and controlgear 62063 -- 308 High-voltage alternating current circuit-breakers - Guide for asymmetrical short-circuit breaking test duty T100a 62215 -- __________

- 5 - EN 62271-105:2003
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments). 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 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 60282-1 2002 High-voltage fuses Part 1: Current-limiting fuses
EN 60282-1 2002 IEC 60694 1996 Common specifications for high-voltage switchgear and controlgear standards
EN 60694 + corr. May 1996 1999 IEC 60787 1983 Application guide for the selection of fuse-links of high-voltage fuses for transformer circuit applications
- - IEC 62271-100 2001 High-voltage switchgear and controlgearPart 100: High-voltage alternating-current circuit-breakers
EN 62271-100 2001 IEC 62271-102 + corr. April 2001 2002 Part 102: High-voltage alternating current disconnectors and earthing switches
EN 62271-102 2002
NORMEINTERNATIONALECEIIECINTERNATIONALSTANDARD62271-105Première éditionFirst edition2002-08Appareillage à haute tension –Partie 105:Combinés interrupteurs-fusiblespour courant alternatifHigh-voltage switchgear and controlgear –Part 105:Alternating current switch-fusecombinationsPour prix, voir catalogue en vigueurFor price, see current catalogue© IEC 2002
Droits de reproduction réservés
⎯
Copyright - all rights reservedAucune partie de cette publication ne peut être reproduite niutilisée sous quelque forme que ce soit et par aucun procédé,électronique ou mécanique, y compris la photocopie et lesmicrofilms, sans l'accord écrit de l'éditeur.No part of this publication may be reproduced or utilized in anyform or by any means, electronic or mechanical, includingphotocopying and microfilm, without permission in writing fromthe publisher.International Electrotechnical Commission,
3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, SwitzerlandTelephone: +41 22 919 02 11
Telefax: +41 22 919 03 00
E-mail: inmail@iec.ch
Web: www.iec.chCODE PRIXPRICE CODEXCommission Electrotechnique InternationaleInternational Electrotechnical Commission

62271-105 © IEC:2002– 3 –CONTENTSFOREWORD.71General.131.1Scope.131.2Normative references.152Normal and special service conditions.153Definitions.153.1General terms.153.2Assemblies.153.3Parts of assemblies.153.4Switching devices.173.5Parts of switching devices.173.6Operation.173.7Characteristic quantities.193.8Fuses.234Ratings.254.1Rated voltage (Ur).254.2Rated insulation level.254.3Rated frequency (fr).254.4Rated normal current and temperature-rise.254.5Rated short-time withstand current (Ik).254.6Rated peak withstand current (Ip).254.7Rated duration of short circuit (tk).274.8Rated supply voltage of closing and opening devices and auxiliary circuits (Ua).274.9Rated supply frequency of closing and opening devices and of auxiliary circuits.274.10Rated pressure of compressed gas supply for operation.275Design and construction.295.1Requirements for liquids in switch-fuse combinations.295.2Requirements for gases in switch-fuse combinations.295.3Earthing of switch-fuse combinations.295.4Auxiliary equipment.295.5Dependent power operation.295.6Stored energy operation.295.7Independent manual operation.295.8Operation of releases.295.9Low- and high pressure interlocking devices.315.10Nameplates.315.11Interlocking devices.315.12Position indication.335.13Degrees of protection by enclosures.335.14Creepage distances.335.15Gas and vacuum tightness.335.16Liquid tightness.335.17Flammability.335.18Electromagnetic compatibility (EMC).33

62271-105 © IEC:2002– 5 –6Type tests.356.1General.356.2Dielectric tests.376.3Radio interference voltage (RIV) tests.376.4Measurement of the resistance of the main circuit.376.5Temperature-rise tests.376.6Short-time withstand current and peak withstand current tests.376.7Verification of the protection.376.8Tightness tests.396.9Electromagnetic compatibility tests (EMC).397Routine tests.598Guide for the selection of switch-fuse combinations for transformer protection.619Information to be given with enquiries, tenders and orders.6510Rules for transport, storage, installation, operation and maintenance.6711Safety.67Annex A (informative)
Example of the coordination of fuses, switch and transformer.69Annex B (normative)
Procedure for determining transfer current.73Figure 1 – Representation of a specified TRV by a two-parameter
reference line and adelay line.77Figure 2 – Example of a two-parameter reference line for a TRV.77Figure 3 – Arrangement of test circuits for test duties TDIsc and TDIWmax.79Figure 4 – Arrangement of test circuits for test duty TDItransfer.79Figure 5 – Arrangement of test circuits for test duty TDIto.81Figure 6 – Determination of power-frequency recovery voltage.83Figure 7 – Practical determination of transfer current.85Figure 8 – Determination of the transfer current with the iterative method.87Figure 9 – Transfer current in relation to the primary fault current Isc
due to a solidshort in the transformer secondary terminal.89Figure 10 – Characteristics relating to the protection of an 11 kV – 400 kVAtransformer.91Figure 11 – Discrimination between HV and LV fuses.93Figure 12 – Characteristics for determining take-over current.95Table 1 – Nameplate markings.31Table 2 – Standard values of prospective TRV for test duty TDItransfer.51Table 3 – Summary of test parameters for test duties.53

62271-105 © IEC:2002– 7 –INTERNATIONAL ELECTROTECHNICAL COMMISSION____________HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR –Part 105: Alternating current switch-fuse combinationsFOREWORD1)The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprisingall national electrotechnical committees (IEC National Committees). The object of the IEC is to promoteinternational co-operation on all questions concerning standardization in the electrical and electronic fields. Tothis end and in addition to other activities, the IEC publishes International Standards. Their preparation isentrusted to technical committees; any IEC National Committee interested in the subject dealt with mayparticipate in this preparatory work. International, governmental and non-governmental organizations liaisingwith the IEC also participate in this preparation. The IEC collaborates closely with the InternationalOrganization for Standardization (ISO) in accordance with conditions determined by agreement between thetwo organizations.2)The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, aninternational consensus of opinion on the relevant subjects since each technical committee has representationfrom all interested National Committees.3)The documents produced have the form of recommendations for international use and are published in the formof standards, technical specifications, technical reports or guides and they are accepted by the NationalCommittees in that sense.4)In order to promote international unification, IEC National Committees undertake to apply IEC InternationalStandards transparently to the maximum extent possible in their national and regional standards. Anydivergence between the IEC Standard and the corresponding national or regional standard shall be clearlyindicated in the latter.5)The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for anyequipment declared to be in conformity with one of its standards.6)Attention is drawn to the possibility that some of the elements of this International Standard may be the subjectof patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.International Standard IEC 62271-105 has been prepared by subcommittee 17A, High-voltageswitchgear and controlgear, of IEC technical committee 17: Switchgear and controlgear.This first edition cancels and replaces the second edition of IEC 60420, published in 1990,and constitutes a technical revision. A reference table to explain the new numbering in thisseries is provided at the end of this foreword.The text of this standard is based the following documents:FDISReport on voting17A/633/FDIS17A/640/RVDFull information on the voting for the approval of this standard can be found in the report onvoting indicated in the above table.This publication has been drafted in accordance with the ISO/IEC Directives, Part 3.This standard should be read in conjunction with IEC 60694, second edition, published in1996, to which it refers and which is applicable, unless otherwise specified. In order tosimplify the indication of corresponding requirements, the same numbering of clauses andsubclauses is used as in IEC 60694. Amendments to these clauses and subclauses are givenunder the same numbering, whilst additional subclauses are numbered from 101.

62271-105 © IEC:2002– 9 –Annex A is for information only.Annex B forms an integral part of this standard.The committee has decided that the contents of this publication will remain unchanged until 2013.At this date, the publication will be•reconfirmed;•withdrawn;•replaced by a revised edition, or•amended.New numberingIn accordance with the decision taken at the joint SC 17A/SC 17C meeting in Frankfurt, June1998 (item 20.7 of 17A/535/RM), a common numbering system will be established of thestandards falling under the responsibility of SC 17A and SC 17C. IEC 62271 (with the maintitle of High-voltage switchgear and controlgear) is the basis of the common standard.The numbering of these standards will apply the following principle:a) Common standards prepared by SC 17A and SC 17C will start with IEC 62271-001;b) Standards of SC 17A will start with IEC 62271-100;c) Standards of SC 17C will start with IEC 62271-200;d) Guides prepared by SC 17A and SC 17C will start with IEC 62271-300.The following table provides an overview of the relationship between the old and newnumbering.

62271-105 © IEC:2002– 11 –Common numbering of IEC 62271 standards falling under the responsibilityof sub-committees 17A and 17C *HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEARIEC 62271PartOriginal titleOldIEC number,if any001Common specifications for high-voltage switchgear and controlgear standards60694100High-voltage alternating current circuit-breakers60056101Synthetic testing of high-voltage alternating current circuit-breakers60427102Alternating current disconnectors and earthing switches60129103Switches for rated voltages above 1 kV and less than 52 kV60265-1104High-voltage switches for rated voltages of 52 kV and above60265-2105Alternating current switch-fuse combinations60420106High-voltage alternating current contactors and contactor-based motor-starters60470107High-voltage alternating current switchgear-fuse combinationsNew108Switchgear having combined functionsNew109Alternating-current series capacitor by-pass switches200AC metal enclosed switchgear and controlgear for rated voltages above 1 kV and upto and including 52 kV60298201AC insulation-enclosed switchgear and controlgear for rated voltages above 1 kV andup to and including 38 kV60466202High-voltage/low-voltage prefabricated substations61330203Gas-insulated metal-enclosed switchgear for rated voltages of 72,5 kV and above60517204Rigid high-voltage, gas-insulated transmission lines for rated voltages of 72,5 kV andabove61640300Guide for seismic qualification of high-voltage alternating current circuit-breakers61166301High-voltage alternating current circuit-breakers – Inductive load switching61233302High-voltage alternating current circuit-breakers – Guide for short-circuit andswitching test procedures for metal-enclosed and dead tank circuit-breakers61633303High-voltage switchgear and controlgear – Use and handling of sulphur hexafluoride(SF6) in high-voltage switchgear and controlgear61634304Additional requirements for enclosed switchgear and controlgear from 1 kV to 72,5 kVto be used in severe climatic conditions60932305Cable connections for gas-insulated metal-enclosed switchgear for rated voltages of72,5 kV and above – Fluid-filled and extruded insulation cables – Fluid-filled and drytype cable-terminations60859306Direct connection between power transformers and gas-insulated metal-enclosedswitchgear for rated voltages of 72,5 kV and above61639307High-voltage switchgear and controlgear – The use of electronic and associatedtechnologies in auxiliary equipment of switchgear and controlgear62063308Guide for asymmetrical short-circuit breaking test duty T100a62215* The table is subject to change pending the transfer of technical reports to standards.

62271-105 © IEC:2002– 13 –HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR –Part 105: Alternating current switch-fuse combinations1 General1.1 ScopeThis part of IEC 62271 applies to three-pole units for public and industrial distribution systemswhich are functional assemblies of switches including switch-disconnectors and current-limiting fuses designed so as to be capable of–breaking, at the rated recovery voltage, any current up to and including the rated short-circuit breaking current,–making, at the rated voltage, circuits to which the rated short-circuit breaking currentapplies.It does not apply to fuse-circuit-breakers, fuse-contactors, combinations for motor-circuits orto combinations incorporating single capacitor bank switches.In this standard, the word “combination” is used for combination in which the componentsconstitute a functional assembly. Each association of a given type of switch and a given typeof fuse defines one type of combination.In practice, different types of fuses may be combined with one type of switch, which givesseveral combinations with different characteristics, in particular concerning the rated currents.Moreover, for maintenance purposes, the user should know the types of fuses that can beassociated to a given switch without impairing compliance to the standard, and thecorresponding characteristics of the so-made combination.A switch-fuse combination is then defined by its type designation and a list of selected fusesis defined by the manufacturer, the so-called “reference list of fuses”. Compliance with thisstandard of a given combination means that every combination using one of the selectedfuses is proven to be in compliance with this standard.The fuses are incorporated in order to extend the short-circuit breaking rating of thecombination beyond that of the switch alone. They are fitted with strikers in order both to openautomatically all three poles of the switch on the operation of a fuse and to achieve a correctoperation at values of fault current above the minimum melting current but below the minimumbreaking current of the fuses. In addition to the fuse strikers, the combination may be fittedwith either an over-current release or a shunt release.NOTE
In this standard the term “fuse” is used to designate either the fuse or the fuse-link where the generalmeaning of the text does not result in ambiguity.This standard applies to combinations designed with rated voltages above 1 kV up to andincluding 52 kV for use on three-phase alternating current systems of either 50 Hz or 60 Hz.Fuses are covered by IEC 60282-1.

62271-105 © IEC:2002– 15 –Switches, including their specific mechanism, should be in accordance with IEC 60265-1except for the short-time current and short-circuit making requirements where the current-limiting effects of the fuses are taken into account.Earthing switches forming an integral part of a combination are covered by IEC 62271-102.1.2 Normative referencesSubclause 1.2 of IEC 60694 is applicable with the following additions.IEC 60265-1:1998, High-voltage switches – Part 1: Switches for rated voltages above 1 kVand less than 52 kVIEC 60282-1:2002, High-voltage fuses – Part 1: Current-limiting fusesIEC 60694:1996, Common specifications for high-voltage switchgear and controlgearstandardsIEC 60787:1983, Application guide for the selection of fuse-links of high-voltage fuses fortransformer circuit applicationsIEC 62271-100:2001, High-voltage switchgear and controlgear – Part 100: High-voltagealternating-current circuit-breakersIEC 62271-102: 2001, High-voltage switchgear and controlgear – Part 102: High-voltagealternating current disconnectors and earthing switches2 Normal and special service conditionsClause 2 of IEC 60694 is applicable.3 DefinitionsFor the purposes of this part of IEC 62271, the definitions of IEC 60050(441) and IEC 60694,as well as the following definitions, apply.Some of them are recalled hereunder for easier use.3.1 General termsNone.3.2 AssembliesNone.3.3 Parts of assembliesNone.

62271-105 © IEC:2002– 17 –3.4 Switching devices3.4.101switch-fuse combinations (includes fuse-switch combinations)combination of a three-pole switch with three fuses provided with strikers, the operation ofany striker causing all three poles of the switch to open automatically3.4.102switch-fuse combinations base (or combination base)switch-fuse combination without fuse-links mounted3.4.103switch-fuse[IEV 441-14-14]3.4.104fuse-switch[IEV 441-14-17]3.4.105switch-disconnector[IEV 441-14-12]3.4.106release operated combinationcombination in which automatic opening of the switch can also be initiated by either an over-current release or a shunt release3.5 Parts of switching devices3.5.101release[IEV 441-15-17]3.5.102over-current release[IEV 441-16-33]3.5.103shunt release[IEV 441-16-41]3.6 Operation3.6.101independent manual operation (of the switch)[IEV 441-16-16]3.6.102stored energy operation (of the switch)[IEV 441-16-15]

62271-105 © IEC:2002– 19 –3.7 Characteristic quantities3.7.101prospective current (of a circuit and with respect to a switching device or a fuse)[IEV 441-17-01]3.7.102prospective peak current[IEV 441-17-02]3.7.103maximum prospective peak current[IEV 441-17-04]3.7.104prospective breaking current[IEV 441-17-06]3.7.105breaking current[IEV 441-17-07]3.7.106minimum breaking current[IEV 441-18-29]3.7.107short-circuit making capacity[IEV 441-17-10]3.7.108cut-off currentlet-through current (of a fuse)[IEV 441-17-12]3.7.109transfer current (striker operation)value of the three-phase symmetrical current at which the fuses and the switch exchangebreaking dutiesNOTE
Above this value the three-phase current is interrupted by the fuse only. Immediately below this value, thecurrent in the first-pole-to-clear is interrupted by the fuse and the current in the other two poles by the switch, or bythe fuses, depending on the tolerances of the fuse time current characteristic and the fuse-initiated opening timeof the switch.3.7.110take-over current[IEV 441-17-16]3.7.111minimum take-over current (of a release-operated combination)current determined by the point of intersection of the time-current characteristics of the fuseand the switch corresponding toa)the maximum break time plus, where applicable, the maximum operating time of anexternal over-current or earth-fault relay,b)the minimum pre-arcing time of the fuseSee Figure 12.

62271-105 © IEC:2002– 21 –3.7.112maximum take-over current (of a release-operated combination)current determined by the point of intersection of the time-current characteristics of the fuseand the switch, operated by the release3.7.113fused short-circuit current[IEV 441-17-21]3.7.114applied voltage[IEV 441-17-24]3.7.115recovery voltage[IEV 441-17-25]3.7.116transient recovery voltage (TRV)[IEV 441-17-26]3.7.117power-frequency recovery voltage[IEV 441-17-27]3.7.118prospective transient recovery voltage[IEV 441-17-29]3.7.119fuse-initiated opening time (of the switch)time taken from the instant at which arcing in the fuse commences to the instant when thearcing contacts have separated in all poles3.7.120release-initiated opening time (of the switch)release-initiated opening time is defined according to the tripping method as stated below withany time-delay device forming an integral part of the switch adjusted to a specified setting:a)for a switch tripped by any form of auxiliary power, interval of time between the instant ofenergizing the opening release, the switch being in the closed position, and the instantwhen the arcing contacts have separated in all poles.b) for a switch tripped (other than by the striker) by a current in the main circuit without theaid of any form of auxiliary power, interval of time between the instant at which,the switch being in the closed position, the current in the main circuit reaches theoperating value of the over-current release and the instant when the arcing contactshave separated in all poles3.7.121minimum release-initiated opening time (of the switch)release-initiated opening time when the specified setting of any time-delay device forming anintegral part of the switch is its minimum setting

62271-105 © IEC:2002– 23 –3.7.122maximum release-initiated opening time (of the switch)release-initiated opening time when the specified setting of any time-delay device formingan integral part of the switch is its maximum setting3.7.123break-time[IEV 441-17-39]3.7.124arcing time (of a pole or a fuse)[IEV 441-17-37]3.8 Fuses3.8.101reference list of fuseslist of fuses defined by the manufacturer for a given type of switch-fuse combination base, forwhich compliance to the present standard of all corresponding switch-fuse combinations isassessedNOTE
This list can be updated. Conditions for extending the validity of the type tests are given in 8.102.3.8.102fuse-basefuse mount[IEV 441-18-02]3.8.103striker[IEV 441-18-18]3.8.104pre-arcing timemelting time[IEV 441-18-21]3.8.105operating timetotal clearing time[IEV 441-18-22]3.8.106arcing time (of a pole or a fuse)[IEV 441-17-37]3.8.107I²t – Joule integral[IEV 441-18-23]

62271-105 © IEC:2002– 25 –4 RatingsClause 4 of IEC 60694 is applicable with the additions and exceptions indicated below.In addition to the ratings listed in IEC 60694 the following ratings apply:k)rated short-circuit breaking currentl)rated transient recovery voltagem)rated short-circuit making currentn)rated transfer current for striker operationo)rated take-over current for a release-operated combination.4.1 Rated voltage (Ur)Subclause 4.1 of IEC 60694 is applicable.4.2 Rated insulation levelSubclause 4.2 of IEC 60694 is applicable.4.3 Rated frequency (fr)Subclause 4.3 of IEC 60694 is applicable.4.4 Rated normal current and temperature rise4.4.1 Rated normal current (Ir)Subclause 4.4.1 of IEC 60694 is applicable with the following addition:The rated normal current applies to the complete combination, made of the combination baseand the selected fuses.It is not required that the rated normal current is selected from the R10 series.4.4.2 Temperature riseSubclause 4.4.2 of IEC 60694 is applicable and, as far as fuses are concerned, IEC 60282-1.4.5 Rated short-time withstand current (Ik)Subclause 4.5 of IEC 60694 is not applicable.4.6 Rated peak withstand current (Ip)Subclause 4.6 of IEC 60694 is not applicable.

62271-105 © IEC:2002– 27 –4.7 Rated duration of short-circuit (tk)Subclause 4.7 of IEC 60694 is not applicable.4.8 Rated supply voltage of closing and opening devices and auxiliary circuits (Ua)Subclause 4.8 of IEC 60694 is applicable.4.9 Rated supply frequency of closing and openingdevices and of auxiliary circuitsSubclause 4.9 of IEC 60694 is applicable.4.10 Rated pressure of compressed gas supply for operationSubclause 4.10 of IEC 60694 is applicable.4.101
Rated short-circuit breaking currentThe rated short-circuit breaking current is the highest prospective short-circuit current whichthe combination shall be capable of breaking under the conditions of use and behaviourprescribed in this standard in a circuit having a power-frequency recovery voltage corres-ponding to the rated voltage of the combination and having a prospective transient recoveryvoltage equal to the rated value specified in 4.102.The rated short-circuit breaking current is expressed by the r.m.s. value of its a.c. component.The rated short-circuit breaking currents shall be selected from the R10 series as follows:8 – 10 – 12,5 – 16 – 20 – 25 – 31,5 – 40 – 50 – 63 – 80 – 100 kANOTE
It is recognized that the series impedance of the combination or rapid operation of the fuses or switch maycause one or both of the following effects:a)a reduction of short-circuit current to a value appreciably below that which would otherwise be reached;b)such rapid operation that the short-circuit current wave is distorted from its normal form. This is why the term“prospective current” is used when assessing breaking and making performances.4.102
Rated transient recovery voltageThe rated transient recovery voltage related to the rated short-circuit breaking current (inaccordance with 4.101) is the reference voltage which constitutes the upper limit of theprospective transient recovery voltage of circuits which the combination shall be capable ofbreaking in the event of a short circuit.For the parameters of the prospective transient recovery voltage, IEC 60282-1 applies.

62271-105 © IEC:2002– 29 –4.103
Rated short-circuit making currentThe rated short-circuit making current is the highest prospective peak current which thecombination shall be capable of making under the conditions of use and behaviour defined inthis standard in a circuit having a power-frequency voltage corresponding to the rated voltageof the combination. It shall be 2,5 times (50 Hz) or 2,6 times (60 Hz) the value of the ratedshort-circuit breaking current.NOTE
See also the note in 4.101.4.104
Rated transfer current (striker operation) (Itransfer)The rated transfer current is the maximum r.m.s. value of the transfer current which the switchin the combination is able to interrupt.4.105
Rated take-over current for release-operated combinations (Ito)The rated take-over current is the maximum r.m.s. value of the take-over current which theswitch in the combination is able to interrupt.5 Design and construction5.1 Requirements for liquids in switch-fuse combinationsSubclause 5.1 of IEC 60694 is applicable.5.2 Requirements for gases in switch-fuse combinationsSubclause 5.2 of IEC 60694 is applicable.5.3 Earthing of switch-fuse combinationsSubclause 5.3 of IEC 60694 is applicable.5.4 Auxiliary equipmentSubclause 5.4 of IEC 60694 is applicable.5.5 Dependent power operationSubclause 5.5 of IEC 60694 is applicable with the following addition:Dependent manual operation is not allowed.5.6 Stored energy operationSubclause 5.6 of IEC 60694 is applicable.5.7 Independent manual operationSubclause 5.7 of IEC 60694 is not applicable.5.8 Operation of releasesSubclause 5.8 of IEC 60694 is applicable.

62271-105 © IEC:2002– 31 –5.9 Low- and high pressure interlocking devicesSubclause 5.9 of IEC 60694 is applicable.5.10 NameplatesSubclause 5.10 of IEC 60694 is applicable with the following addition:The nameplate of a switch-fuse combination shall contain information according to table 1.Table 1 – Nameplate markingsAbbreviationUnitSwitch-fusecombinationOperatingdeviceCondition for markingrequired(1)(2)(3)(4)(5)(6)ManufacturerXYOnly if not integral with thecombination and/or ifmanufacturers are differentType designationXYSerial numberX(Y)Number of this standardXRated voltageUrkVXRated lightning impulsewithstand voltageUpkVXRated frequencyfrHzXRated normal current withfusesSee referencelistXRated filling pressure foroperationPrmMPaYWhen applicableRated supply voltage ofclosing and opening devicesand of auxiliary and controlcircuitsUaVYWhen applicableYear of manufactureXTemperature classYDifferent from–5 °C indoors–25 °C outdoorsX The marking of these values is mandatory; blank spaces indicate zero values.Y The marking of these values is mandatory, subject to the conditions in column (6).(Y)The marking of these values is optional and subject to the conditions in column (6).NOTE
The abbreviations in column (2) may be used instead of the terms in column (1). When the terms in column (1)are used, the word “rated” need not appear.5.11 Interlocking devicesSubclause 5.11 of IEC 60604 is applicable.

62271-105 © IEC:2002– 33 –5.12 Position indicationSubclause 5.12 of IEC 60694 is applicable.5.13 Degrees of protection by enclosuresSubclause 5.13 of IEC 60694 is applicable.5.14 Creepage distancesSubclause 5.14 of IEC 60694 is applicable.5.15 Gas and vacuum tightnessSubclause 5.15 of IEC 60694 is applicable.5.16 Liquid tightnessSubclause 5.16 of IEC 60694 is applicable.5.17 FlammabilitySubclause 5.17 of IEC 60694 is applicable.5.18 Electromagnetic compatibility (EMC)Subclause 5.18 of IEC 60694 is applicable.5.101
Linkages between the fuse striker(s) and the switch releaseThe linkages between the fuse striker(s) and the switch release shall be such that the switchoperates satisfactorily under both three-phase and single-phase conditions at the minimumand maximum requirements of a given type of striker (medium or heavy) irrespective of themethod of striker operation (spring or explosive). The requirements for strikers are given inIEC 60282-1.5.102
Low over-current conditions (long fuse-pre-arcing time conditions)The switch-fuse combination shall be designed so that the combination will performsatisfactorily under low over-current conditions. This is achieved by compliance with thefollowing:a) time coordination between switch and fuse is provided by either 1), 2) or 3) below:1) the fuse-initiated opening time of the switch shall be shorter than the maximum arcingtime the fuse can withstand as specified in IEC 60282-1,NOTE
New tests have been introduced in IEC 60282-1 in order to asses that the maximum arcingwithstand time under long pre-arcing conditions is at least 100 ms.2) where the fuse manufacturer can show that the fuse has been satisfactorily proven atall values of breaking current from the rated value down to the value equivalent to theminimum melting current of the fuse in the combination (i.e. full range fuses) thenthe fuse-initiated opening time of the switch-fuse combination is deemed not relevant,

62271-105 © IEC:2002– 35 –3) where it can be shown that the thermal release of the fuse striker makes the switchclear the current before arcing in the fuse can occur, for all currents below I3(minimum breaking current of the fuse according to IEC 60282-1);b) temperature rise under these conditions does not impair the performances of the combin-ation as proven by the test described in 6.104.6 Type testsClause 6 of IEC 60694 is applicable, with the additions and exceptions indicated below.6.1 GeneralThe purpose of type tests is to prove the characteristics of switch-fuse combinations, theiroperating devices and their operating equipment.It is required that the switch in the combination have been tested as an individual componentfor compliance with IEC 60265-1, except for the short-time current and short-circuit makingrequirements. Further, it is understood that the fuses have been tested to the requirements ofIEC 60282-1.Type tests include:− dielectric tests;− temperature-rise tests;− measurement of the resistance of the main circuit;− tests to prove the ability of the combination to make and break the specified currents;− tests to prove the satisfactory mechanical operation and endurance;− verification of the protection;− tightness tests;− electromagnetic compatibility tests.For combinations, three groups of tests are involved:a)tests on the switch in accordance with IEC 60265-1; these tests may be carried out ona combination other than that used for tests c);b)tests on the fuse in accordance with IEC 60282-1;c)tests on the combination in accordan
...