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NORME eElINTERNATIONALE iscINTERNATIONAL 60269-4STANDARD 1986

AMENDEMENT 2AMENDMENT 22002-10

Amendement 2Fusibles basse tension -Partie 4:Prescriptions supplementalres concernantles elements de remplacement utilises pour laprotection des dispositifs i t semiconducteurs

Amendment 2Low-vcltaqe fuses -Part 4:Supplementary requirements for fuse-linksfor the protection of semiconductor devices

IEC 2002 Drorts de reproduction reserves - Copynght - all nghts reservedIntemaUonal Electrotechmcal CommlSSlon, 3, rue de Varembil, PO Box 131, CH-1211 Geneva 20, SWitzerlandTelephone +41229190211 Teletax +41229190300 E-mail mmall@leech Web wwwleech

Ccrnrmssron Electrotechnlque tnternanoneleInternational Eleelrotechmcal CornnuseronMe)l{AYHapoAHa~ 3I1eK.TpOTeXII~yeCKaR KOr.1~CC~R

CODE PRIXPRICE CODe KP o or p riX , V O I r c at alo g ue en IIIglJ6urF o r pnce , S911 c u r r e n t calafogue

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60269-4 Amend 2 IEC'2002 -3-

FOREWORDThis amendment has been prepared by subcommittee 32B. Low-voltage fuses, of lEe tech-meal committee 32 Fuses.The text of this amendment IS based on the following documents:

FDIS Report on voting32B/412/FDIS 32B/418JRVD

Full information on the voting for the approval of this amendment can be found in the reporton voting indicated In the above tableThe committee has decided that the contents of the base publication and ItS amendments willremain unchanged until 2004-12 At this date, the publication Will be

reconfirmed,withdrawn,replaced by a revised edition, oramended

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EXPLANATORY NOTEReplace the eXlstmg explanatory note by the followmgIn view of the fact that this standard should be read together with lEe 60269-1 Low-voltagefuses - Part 1. General requirements, the numbering of its clauses, su bclauses and tables ISmade to correspond to the laUerChange reference lEG 269-1 to lEG 60269~1 throughout this standard

Page 112.2.14 Semiconductor deviceReplace the eXlstmg subclause by the followmg and delete the footnote at the bottom of thepage2.2.14 Semiconductor device (according to lEe 60050(521})A device whose essential charactensnes are due to the flow of charge carriers within asemiconductor

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602694 Amend 2 IEC 2002 -5-

Add, after 2 2.15, the followmg new subclause2.2.16 Signalling deviceA device forming part of the fuse and signalling the fuse operation to a remote placeA signalling device consists of a striker and an auxihary switch Electronic devices may alsobe used.

Page 133.6.3 Time constant (~Replace "table XII" by atable XIIS".

Page 155.2 Rated voltageReplace the eXlstmg subclause by the followingFor rated a c voltages up to 690 V and d.c voltages up to 750 V, IEC 602691 applies, forhigher voltages, the values shall be selected from the R5 senes or, where not possible, fromthe R10 senes of ISO 3

Page 175.6.2 Conventional times and currentsReplace the eXisting text by the following5.6.2.1 Conventional times and currents for "aR" fuselinksNot applicable

5.6.2.2 Conventional times and currents for "gR" and "gS" fuse-llnksThe conventional times and currents are given in table II.

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60269-4 Amend 2 IEC:2002 -7-

Table II - Conventional times and currents for "gR" and "g5" fuse-linksConventional current

Rated current Conventional time Type "gR" Type "gS"A h l o f If I n f I f

In s 63 163

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60269-4 Amend 2 IEC:2002

I ISymbol 5016 In IEC 60417-2

7.4 OperationReplace the eXlstmg text by the following:

-9-

Symbol 5186 In IEC 60417-2

The fuse-link shall be so designed and proportioned as to carry continuously any value ofcurrent up to its rated current (see 8 4 3.4)OaR" fuse-links shall operate and break the crrcuit for any current value not exceeding therated breaking capacity and not less than a current sufficient to melt the fuse element(s)In a time not exceeding 30 sNOTE By agreement between manufacturer and user, shorter times may be chosen for specrat appncatronsFor "gR" and "gS" fuse-links within the conventional time'

its fuse-element does not melt, when It carnes any current not exceeding the conventionalnon-fusing current (Inf),it operates when It carries any current equal to or exceeding the conventional fusingcurrent (If)

Page 238.1.4 Arrangement of the fuse-link

Replace the eXlstmg text by the followmg and delete the footnote at the bottom of the pageThe fuse-link shall be mounted open In surroundings free from draughts and, unless otherwisespecified, In a vertical position (see 8.3 1) Examples of test arrangements are given In figures2a and 2b Test arrangements for other kinds of fuse-links are given In IEC 60269-2-1,Supplementary reqiurements for fuses for use by authonsed persons (fuses mamly formdustnal eppuceuon; and IEC 60269-3-1: Supplementary requirements for fuses for use byunskilled persons (fuses mamly for household and SimIlar applications)

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60269-4 Amend. 2 IEC 2002 - 11 -

Replace the eX/stmg table VilA by the totiowtnq new table VilATable VilA - List of complete tests

Test according to subclause Number of fuse-linksto be tested83 Temperature rise and power dissipation 18 4 3 1 a) Conventional non-fusing current 18 4 3 1 b) Conventional fusing current 18432 Verification of rated current 1843.5 Conventional cable overload test 1

(for "gR" and "gS' fuse-links only)

For a c85 No 5 "gR' and 'gS' breaking capacity

1No 2a oaR' breaking capacity 1No 2 Breaking capacity a 3No 1 Breakmg capacity a 3

86 No. 10 Operating characteristics tests b 2No 9 Operatmg charactensncs tests b 2No 8 Operating charactenslics tests b 2

Operatmg charactensllcs tests b 2No 7 2No 6 Operating charactansucs tests b ,8434 Verificat ion of over load capabili ty C

For d c85 No 13 "gR" and "gS' breaking capacity and operating 1characteristics

No 12a 'aR" breakmg capacity and operating characteristics 1No 12 Breakmg capacity and operating characteristics 3No 11 Breaking capacity and operating charactenstrcs 3

a Valid for pre-arcing [2/ characteristics If ambient air temperature IS 20 DC 5 Cb The tests are valid for cut-off current, 1/, arc voltage and pre-arcmq /21 characteristicsC The number of POints at which the overload capability IS verified should be at the manufacturer'sdiscretion.

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60269-4 Amend 2 IEC:2002 - 13-

Page 27Insert, after "8.4 3 Test method and acceptability of tests results", the followmg newsubclause8.4.3.1 Verification of conventional non-fusing and fusing currentKaR" fuse-linksNot applicable"gR" and "g8" fuse-links:It IS permissible to make the following tests at a reduced voltagea} the fuse-link is subjected to its conventional non-fusing current (Inf) for a time equal to the

conventional time specified In table II. It shall not operate dunnq this time,b) the fuse-link, after having cooled down to ambient temperature, is subjected to the

conventional fusing current (If) It shall operate within the conventional time as specified Intable II The fuse-link shall operate without external effects or damage

Page 29Add the followmg subclause after 8 4 3 4

8.4.3.5 Conventional cable overload protection (for "gR" and "g5" fuse-links only)"gR" and "gS" fuse-links' rec 60269-1 applies8.5.5 Test methodReplace the existing subclauses 855.1 and 85.5.2 by the followmg8.5.5.1 In order to verify that the fuse-link satisfies the conditrons of 7 5, test nos. 1 to 2a forKaR" fuse-links and tests numbers 1, 2 and 5 for "gR" and "gS" fuse-links, as described below,shall be made, unless otherwise specified, with the values stated In table XIIA (see 8.5 52)for each of these testsTest nos 1 and 2For each of these tests, three fuse-links shall be tested in succession. If, dunng test no 1, therequirements of test no 2 are met on one or more tests, then these tests need not berepeated as part of test no 2Test nos. 2a and 5 for a c. and 12a and 13 for d.c .For a.c., the values of test current are specified In table XIIA. For d C., the values of testcurrent are specified In table XII B. For a C tests, the closing of the circuit In relation to thepassage of the applied voltage through zero may be effected at any instant.

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60269-4 Amend 2 IEC 2002 -15 -

If the testing arrangement does not permit the current to be maintained at the full voltagedunnq all of the time required, the fuse may be pre-heated at reduced voltage by applyrnq acurrent approximately equal to the value of the test current In this case, swrtchmp over to thetest circuit according to 85.2 shall take place before the arc is initiated, and the swrtchrnqtime T1 (Interval without current) shall not exceed 0,2 s. The time interval between re-application of the current and beqmrunq of arcing shall be not less than three times T1

8.5.5.2 For one of the tests of no. 2 and for test no. 2a or 5, the recovery voltage shall bemaintained at a value of

for a C, 100+10 % for fuse-links rated 690 V and higher, ando100 +15 % for other fuse-links,o

- for d c., 100 +20 % of the rated voltage,ofor at least

30 s after operation of fuse-links not containing orqaruc matenals In their body or filler,5 min after operation of the fuse-links In all other cases, SWitching over to another sourceof supply being permitted after 15 s If the SWitching time (interval without voltage) doesnot exceed 0, 1 s

For all other tests, the recovery voltage shall be maintained at the same value for 15 s afteroperation of the fuse

In a lapse of time of at least 6 min and maximum 10 min after the operation, the resistancebetween the contacts of the fuse-link shall be measured (see 8 5 8) and noted With themanufacturer's consent, shorter times are possible If the fuse-link does not contain organicmatenals in its body or frller

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Replace the eXisting table X/IA by the followmg new table XI/A

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60269-4 Amend 2e IEC2002 - 17-Table XIIA - Values for breaking-capacity tests on a.c. fuses

Tests according to 8.5.6.1No.1 No. 2 No.2a No.6

105+5 % for rated voltage of 690V aPower-frequency recovery avoltage C 110+5 % for other rated voltages aa

12a Is = 1,25 /fProspective test current /1 12 "aRM "gR" and "gS'Tolerance on current +10 % a Notapplicable +20 %0 0

0,2 - 0,3 for prospective current up toand including 20 kA 0,3 to 0,5 bower factor0,1 - 0,2 for prospective currentabove 20 kA

Making angle after voltage Not applicable +20 Not specifiedzero aInitiation of arcing after 65 to 90' Not applicablevoltage zero11 current which ISused In the desiqnatron of the raled breaking capacity,h current which shall be chosen in such a manner that the test ISmade under conditions which approximatethose glvmg maximumarc energy,

NOTE This condition may be deemed to be satisfied If the current at the begmnmg of arcing (mstant-aneous value) has reached a value between Q,6.J2 and 0,75.J2 times the prospective current (fora c , the t m s value of the a c component)As a gUide for practical application, the value of current 12 may be found between three and four times thecurrent which corresponds to a pre-arcing time of one half-cycle of rated frequency on the time-currentcharacteristic

1& current which leads to a pre-arcmg lime between 30 sand 45 s, except that the upper limit may be exceededwith the manufacturer's consent Shorter times may be chosen for specral applications,

Is the test made at trustest current ISdeemed 10 verify that the fuse ISable to operate satisfactorily In the rangeof small overcurrenls If the pre-arcing lime ISless than 30 s, the test shall be repeated at a reduced value ofcurrent

a The positive tolerance may be exceeded with the manufacturer's consentb Power factors lower than 0,3 may be permitted WIththe manufacturer's consentc For single-phase Circuits, the r m s value of the applied voltage ISfor all practical purposes equal to the r m s

value of the power-frequency recovery voltage

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60269-4 Amend 2 IEC 2002 - 19-

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Replace the eXisting table XI/B by the follOWing new table XI/BTable Xlla - Values for breaking-capacity tests on d.c. fuses

Tests according to 8.5.5.1No.11 No.12 No. 12a I No.13

Mean value of recovery voltage a 115 +5 % of the rated voltage b-9/1 12 i2a 15= 1,2511Prospective test current WaR" "gR" and "gS

Tolerance on current ~bo% Not applicable ~~o%Where prospecllve test current IS greater than 20 kA 10 ms to 12 ms

Time constant C Where prospecnve test current J ISequal or less than 20 kA.0,5 (1)0,3 ms With a tolerance of +~o % b (value of lin A)

11 current which ISused In the desiqnatron of the rated breaking capacity (see 5 7),12 current which shall be chosen In such a manner that the test IS made under conditions which

approximate those giVing maximum arc energy,NOTE This condition may be deemed to be satisfied If the current, at the beginning of arcing,has reached a value between 0,5 and 0,8 times the prospective current

12a current which leads to a pre-arcmq time of at least 30 s, except that the upper limit may be exceededWith the manufacturer's consent Shorter times may be chosen for special applications,

Is the test made With this test current IS deemed to verify that the fuse IS able to operate satisfactorily 10the range of small overcurrents If the pre-arcing time IS less than 30 s, the test shall be repeated at areduced value of current

a This tolerance Includes rippleb The upper limit may be exceeded With the manufacturer's consentc In some practical applications, time-constant values may be found which are shorter than those

mdrcatad In the tests and which may result In a more favourable fuse performance Time constantswhich are consrderably longer than those mdrcated Will In most cases Significantly affect theperformance. In particular With respect to the rated voltage For such applications. further mforrnatronmay be available from the manufacturer