Iec 60269 2 2016

6 8.3 Verif i ation of temp rature rise an p wer dis ip tion... 7 8.3 Verif i ation of temp rature rise an p wer dis ip tion.. 8.3 Verif i ation of temp rature rise an p wer dis ip tion.

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fuses A to K

Fusibles basse t ension –

Partie 2: Ex igences supplément aires pour les fusibles dest inés à êt re ut il sés par

Ex emples de sy st èmes de fusibles normal sés A à K

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fuses A t o K

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IEC 60269- 2

Edit io 5.1 2 16-0

fuses A to K

Ex emples de sy st èmes de fusibles normal sés A à K

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FOREWORD 16

INTRODUCTION 18

1 General s o e 19

1.1 Sco e 19

1.2 Normative ref eren es 19

Fus s stem A – F s s with f us -l nk with bla e conta ts (NH f us s stem) 21

1 General 21

1.1 Sco e 21

2 Terms an def i ition 21

3 Con ition for o eration in service 2

4 Clas if i ation 2

5 Characteristic of f uses 2

5.2 Rated voltage 2

5.3.1 Rated c r ent of the f use-ln 2

5.3.2 Rated c r ent of the f use-holder 2

5.5 Rated p wer dis ip tion of a fuse-l n an rated ac e ta le p wer dis ip tion of a f use-holder 2

5.6 Limits of time-c r ent c aracteristic 2

5.6.1 Time-c r ent c aracteristic , time-c r ent zones an overlo d c rves 2

5.6.2 Con entional times an c r ents 2

5.6.3 Gates 2

5.7.2 Rated bre kin ca acity 2

6 Markin s 2

6.1 Markin s of f use-holders 2

6.2 Markin s of f use-l n s 2

7 Stan ard con ition for con tru tion 2

7.1 Mec anical desig 2

7.1.2 Con ection , in lu in terminals 2

7.1.3 Fu e-contacts 2

7.1.6 Con tru tion of f use-b ses 2

7.1.7 Con tru tion of a f use-l n 2

7.2 In ulatin pro erties an s ita i ty for in ulation 2

7.7 I 2 t c aracteristic 2

7.8 Overc r ent dis rimination of fuse-l n s 2

7.9 Protection again t electric s oc 2

8 Tests 2

8.1.4 Ar an ement of the fuse an dimen ion 2

8.1.6 Testin of f use-holders 2

8.2.4 Ac e ta i ty of test res lts 2

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8.7.4 Verif i ation of overc r ent dis rimination 31

8.9 Verif i ation of esistan e to he t 3

8.9.1 Fu e-b se 3

8.9.2 Fu e-l n s with grip in -lu s of moulded material or of metal fi ed in moulded material 3

8.10 Verif i ation of non-deterioration of contacts 3

8.10.1 Ar an ement of the fuse 3

8.10.2 Test method 3

8.1 Mec anical an mis el ane u tests 3

FIGURES 4

An ex AA (inf ormative) Sp cial test f or ca le overlo d protection 6

AA.1 Ar an ement of the fuse 6

AA.2 Test method an ac e ta i ty of test res lts 6

Fus s stem B – F s s with strik r f us -l nk with bla e conta ts (NH fus s stem) 6

1 General 6

1.1 Sco e 6

4 Clas if i ation 6

5.2 Rated voltage 6

6 Markin s 6

7.1.7 Con tru tion of a f use-l n 6

7.7 I 2 t c aracteristic 6

7.8 Overc r ent dis rimination of "gG" fuse-ln s 6

8 Tests 6

8.3 Verif i ation of temp rature rise an p wer dis ip tion 6

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FIGURES 6

Fus s stem C – F s -rai s (NH f us s stem) 7

1 General 7

1.1 Sco e 7

4 Clas if i ation 7

5.2 Rated voltage 7

5.3.2 Rated c r ent 7

5.5.1 Rated ac e ta le p wer dis ip tion 7

6 Markin s 7

7.2 In ulatin pro erties 7

8 Tests 7

8.9.1 Fu e-b se 7

FIGURES 8

Fus s stem D – F s -ba e f or busbar mounting (4 mm sy tem) (NH fus s stem) 8

1 General 8

1.1 Sco e 8

4 Clas if i ation 8

5.2 Rated voltage 8

5.3 2 Rated c r ent 8

5.5.2 Rated ac e ta le p wer dis ip tion of tan em fuse-b ses 8

6 Markin s 8

Trang 9

8.9.1 Fu e-b se 8

8.1 Mec anical an mis el ane u tests 8

FIGURES 9

Fus s stem E – F s s with f us -l nk for bolte conne tions (BS bolte f us s stem) 9

1 General 9

1.1 Sco e 9

4 Clas if i ation 9

5.6.1 Time-c r ent c aracteristic , time-c r ent zones an overlo d c rves 9

5.6.3 Gates 9

6 Markin s 9

6.1 Markin s of f use-holders 9

6.2 Markin s of f use-l n s 9

7.1.2 Con ection in lu in terminals 9

8 Tests 9

8.3.3 Me s rement of the p wer dis ip tion of the f use-l n 9

8.4 Verif i ation of o eration 10

8.5 Verif i ation of bre kin ca acity 10

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5 Characteristic of f uses 1 1

5.2 Rated voltage 1 1

5.3.1 Rated c r ent of the f use-ln 1 2

5.3.2 Rated c r ent of the f use-holder 1 2

5.5 Rated p wer dis ip tion of a fuse-l n an rated ac e ta le p wer

7.1.2 Con ection in lu in terminals 1 5

7.2 In ulatin pro erties an s ita i ty for in ulation 1 5

7.7 I2

8.7.4 Verif i ation of overc r ent dis rimination 1 9

FIGURES 12

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4 Clas if i ation 12

5.2 Rated voltage 12

5.5 Rated p wer dis ip tion of a f use-l n an rated ac e ta le p wer

7.1.2 Con ection in lu in terminals 12

7.7 I2

Fus s stem H – F s s with f us -l nk h ving "gD" a d "gN" c ara teristic

(cla s J, cla s T, a d cla s L time dela a d non time dela fu e type ) 13

Trang 12

dis ip tion of a f use-holder 13

5.6 Limits of the time-c r ent c aracteristic 13

5.6.1 Time-c r ent c aracteristic , time-c r ent zones 13

8.5.4 Recovery voltage 14

8.6 Verif i ation of c t-of f c r ent c aracteristic 14

8.7 Verif i ation of I

2

t c aracteristic an overc r ent dis rimination 14

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8.7.3 Verif i ation of complan e f or fuse-ln s at 0,01 s 16

5.6.3 Gates 17

6 Markin s 17

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8.5.4 Recovery voltage 17

2

t c aracteristic an overc r ent dis rimination 17

Fus s stem K – gK f us -l nk with bla e conta ts f or bolte conne tion –

High c r e t f us -l nk ratings f rom 1 2 0 A up to 4 8 0A (Ma ter fus -l nk ) 191

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7.6 Cut-of f c r ent c aracteristic 19

7.7 I 2

t c aracteristic 19

7.8 Over c r ent selectivity of “gK” f use-ln s 19

8 Tests 19

2

t c aracteristic an over c r ent selectivity 19

FIGURES 19

Bibl ogra h 2 5

Fig re 101 – Fu e-l n s with blade contacts (1 of3) 4

Fig re 10 – Fu e-b ses f or f use-l n s with blade contacts (1 of 3) 4

Fig re 10 – Re lacement han le 4

Fig re 10 – Time-c r ent zones f or "gG" f use-ln s (1 of5) 5

Fig re 10 – Dummy f use-l n ac ordin to 8.3.4.1, 8.9.1 an 8.10 5

Fig re 10 – Me s rin p ints ac ordin to 8.3.4 of IEC 6 2 9-1, 8.3.4.1, 8.3.4.2 an 8.10.2 of fuse s stem A 5

Fig re 10 – Test k ife ac ordin to 8.5.5.1.2 5

Fig re 10 – Example of a me s rin device for determinin the with rawal forces ac ordin to 8.9.1 an 8.1 1.2 5

Fig re 10 – F ci ty for verif yin the mec anical stren th of grip in -lu s (se 8.1 1.8) 5

Fig re 1 0 – Me s rin p ints ac ordin to 8.10.2 5

Fig re 1 1 – Ref eren e fuse-b se 6

Fig re 1 2 – Desig mark for isolated grip in -lu s 61

Fig re 2 1 – Fu e-l n s with blade contacts with striker (1 of 4) 6

Fig re 2 2 – Fu e-b ses f or f use-l n s with blade contacts with striker (1 of 3) 7

Fig re 3 1 – Fu e- ai s f or f use-ln s with blade contacts (1 of 3) 8

Fig re 3 2 – Test ar an ement f or f use- ai s (1 of 2) 8

Fig re 4 1 – Bu b r mou tin b ses, 1 p le 9

Fig re 4 2 – Bu b r mou tin b ses, 3 p le 91

Fig re 4 3 – Bu b r mou tin b se, size 0 , 2 × 3 p le ( an em fuse-b se) 9

Fig re 4 4 – Test ar an ement f or sin le-p le an triple-p le f use-b ses f or bu b r mou tin ac ordin to 8.3.1 9

Trang 16

Fig re 4 5 – Test ar an ement f or two sin le-p le an six sin le-p le f use-b ses in

tan em ar an ement f or bu b r mou tin ac ordin to 8.3.1 9

Fig re 4 6 – Test ar an ement f or the verif i ation of the p ak with tan c r ent 9

Fig re 4 7 – Dummy f use-l n 9

Fig re 5 1 – Fu e-l n s for b lted con ection – Sizes A, B, C an D (1 of 2) 10

Fig re 5 2 – Typical f use-holder (1 of2) 10

Fig re 5 3 – Time-c r ent zones f or "gG" f use-ln 10

Fig re 5 4 – Time-c r ent zones f or "gG" f use-ln 10

Fig re 6 3 – Base f or fuse-l n s with c l n rical ca s (1 of 2) 12

Fig re 7 1 – Fu e-l n s havin of f set blade contacts, sizes E1, F1, F2 an F3 13

Fig re 7 2 – Typical f use-holder 13

Fig re 7 3 – Time-c r ent zones f or "gG" f use-ln s 13

Fig re 7 4 – Time-c r ent zones f or "gG" f use-ln s 13

Fig re 7 5 – Power dis ip tion test rig 13

Fig re 8 1 – Clas J fuse-l n s (1 A to 6 0 A) 14

Fig re 8 2 – Clas L f use-l n s (7 0 A to 6 0 0 A) 14

Fig re 8 3 – Fu e-b se an contacts for clas J f use-l n s 1 A to 6 0 A 14

Fig re 8 4 – Fu e-b se an contacts for clas L f use-l n s 7 0 A to 6 0 0 A 14

Fig re 8 5 – Clas T f use-l n s (1 A to1 2 0 A) 15

Fig re 8 6 – Fu e-b se an contacts for clas T f use-l n s 1 A to 1 2 0 A 151

Fig re 8 7 – Temp rature test ar an ement 15

Fig re 8 8 – Time-c r ent zones f or "gN" fuse-l n s 15

Fig re 8 9 – Time-c r ent zones f or "gN" fuse-l n s 15

Fig re 810 – Time-c r ent zones f or "gN" fuse-l n s 15

Fig re 81 – Time-c r ent zones f or "gD" fuse-l n s 15

Fig re 9 1 – Time-c r ent zones f or c r ent ratin s 10 A, 2 0 A, 3 5 A an 6 0 A 16

Fig re 9 2 – Time-c r ent zones f or c r ent ratin s 16 A an 315 A 16

Fig re 9 3 – Time-c r ent zones f or c r ent ratin s 2 0 A an 5 0 A 16

Fig re 9 4 – Time-c r ent zones f or c r ent ratin s 2 0 A an 4 0 A 16

Fig re 9 5 – Dimen ion f or f use-l n s with L typ an U type tag 16

Fig re 9 6 – Power dis ip tion test rig 17

Fig re 9 7 – Bre kin ca acity test rig (1 of2) 171

Fig re 10 1 – Clas CC fuse-l n s (1 A to 3 A) 181

Trang 17

Fig re 10 5 – Time-c r ent zones for clas CC “gN” f uses 18

Fig re 10 8 – Time-c r ent zones for clas CC “gD” f uses 18

Fig re 10 9 – Time-c r ent zones for clas CC “gD” f uses 18

Fig re 1010 – Time-c r ent zones for clas CC “gD” f uses 19

Fig re 1 01 – “gK” fuse-l n s (1 of 2) 19

Fig re 1 0 – Con ectin dimen ion f or “gK” fuse-l n s (1 of3) 2 0

Fig re 1 0 – Dummy f use-l n 2 2

Fig re 1 0 – Time-c r ent zones for “gK” fuse s stem K (1 of 2) 2 3

Ta le 101 – Con entional time an c r ent f or "gG" fuse-ln s with rated c r ent lower

than 16 A 2

Ta le 10 – Gates for sp cif ied pre-arcin an o eratin times of "gG" f use-l n s 2

Ta le 10 – Minimum rated bre kin ca acities 2

Ta le 10 – Markin of f use-l n s 2

Ta le 10 – Minimum cros -sectional ran es of u pre ared con u tors 2

Ta le 10 – Pre-arcin an o eratin I 2 t values at 0,01 s for "gG" f use-ln s 2

Ta le 10 – Maximum o eratin I 2 t values for “aM” fuse-ln s 2

Ta le 10 – Pre-arcin I 2 t values f or dis rimination of gG fuse-l n s 2

Ta le 10 – Survey of tests on fuse-holders an n mb r of f use-holders to b tested 2

Ta le 1 0 – Rated impulse with tan voltage 2

Ta le 1 1 – Torq e to b a pl ed to the terminal s rews 2

Ta le 1 2 – Test c r ents 3

Ta le 1 3 – Test c r ents an I 2 t l mits for dis rimination test 3

Ta le 1 4 – Torq es to b a pl ed when no values are given by the man f acturer 3

Ta le 1 5 – Cros -sectional are of aluminium con u tors f or tests cor esp n in to 8.10 3

Ta le 1 6 – Test seq en e f or direct terminal clamps 3

Ta le 1 7 – Permis ible c an es of the resistan e 3

Ta le 1 8 – Force to with raw the fuse-l n from the f use-b se contacts 3

Ta le 2 1 – Position an f orce of the striker 6

Ta le 3 1 – Minimum cros -sectional ran es of u pre ared con u tors for fuse- ai s 7

Ta le 3 2 – Survey of complete tests on fuse- ai s an n mb r of fuse- ais to b tested 7

Ta le 4 1 – Minimum cros -sectional ran es of u pre ared con u tors f or f use-b ses f or bu b r mou tin 8

Ta le 4 2 – Torq es to b a pl ed to contact makin s rews 8

Ta le 4 3 – Test c r ents 8

Ta le 4 4 – Force to with raw the fuse-l n from the f use-b se contacts 8

Ta le 5 1 – Con entional time an c r ent f or "gG" fuse-ln s 9

Ta le 5 2 – Gates for sp cif ied pre-arcin times of "gG" fuse-l n s 9

Ta le 6 1 – Maximum rated c r ent of f use-l n s with c l n rical ca s 1 2

Trang 18

Ta le 6 3 – Maximum values of the rated p wer dis ip tion of a f use-l n 1 3

Ta le 6 4 – Rated ac e ta le p wer dis ip tion of a f use-holder 1 3

Ta le 6 5 – Con entional time an c r ent f or “gG” f use-l n s with rated c r ent lower

than 16 A 1 4

Ta le 6 6 – Gates for sp cif ied pre-arcin an o eratin times of “gG” f use-ln s with

rated c r ent lower than 16 A 1 4

Ta le 6 7 – Minimum rated bre kin ca acities 1 4

Ta le 612 – Survey of tests on fuse-holders an n mb r of f use-holders to b tested 1 7

Ta le 613 – Torq e to b a pl ed to the terminal s rews 1 7

Ta le 7 2 – Gates for sp cif ied pre-arcin times of "gG" fuse-l n s 12

Ta le 7 3 – Sizes of co p r con u tors 12

Ta le 8 5 – Clas J d mmy f use-l n dimen ion 14

Ta le 8 6 – Clas T d mmy f use-l n dimen ion 14

Ta le 8 7 – Maximum c t-of f c r ent (I

c) f or "gD" an "gN" f use-ln s at 2 0 kA

Ta le 9 3 – Cros -sectional are of con u tors for p wer dis ipation an

temp rature- ise tests 16

l n s at 2 0 kA prosp ctive c r ent 17

Trang 19

Ta le 1 0 – Gates f or sp cif ied pre-arcin an o eratin times of “gK” f use-l n s 19

Ta le 1 0 – Minimum rated bre kin ca acities f or “gK” f use-l n s 19

Ta le 1 0 – Pre-arcin an o eratin I

2

t values at 0,01 s for “gK” fuse-l n s 19

Ta le 1 0 – Cros -sectional are of co p r con u tors for tests cor esp n in to 8.3

an 8.4 19

Ta le 1 0 – Maximum c t-of f c r ent (I

c) for “gK”fuse-l n s (1 2 0 A to 4 8 0 A) at

Trang 20

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2) Th formal d cisio s or a re me ts of IEC o te h ic l maters e pre s, a n arly a p s ible, a intern tio al

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th later

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6) Al u ers s o ld e s re th t th y h v th late t e itio of this p blc tio

7) No la i ty s al ata h to IEC or its dire tors, emplo e s, s rv nts or a e ts in lu in in ivid al e p rts a d

memb rs of its te h ic l c mmite s a d IEC Natio al Commite s for a y p rs n l injury, pro erty d ma e or

oth r d ma e of a y n ture wh ts e er, wh th r dire t or in ire t, or for c sts (in lu in le al fe s) a d

e p n e arisin o t of th p blc tio , u e of, or rela c u o , this IEC Pu lc tio or a y oth r IEC

Pu lc tio s

8) Ate tio is drawn to th Normativ refere c s cite in this p blc tio Us of th refere c d p blc tio s is

in is e s ble f or th c re t a plc tio of this p blc tio

9) Ate tio is drawn to th p s ibi ty th t s me of th eleme ts of this IEC Pu lc tio ma b th s bje t of

p te t rig ts IEC s al n t b h ld re p n ible f or id ntifyin a y or al s c p te t rig ts

DISCLAIMER

This Con ol d te v rsion is not a of f icial IEC Sta dard a d ha be n prepare f or

us r conv nie c Only the c r e t v rsion of the sta dard a d its ame dme t s)

are to be considere the of ficial doc me ts

This Con ol d te v rsion of IEC 6 2 9-2 be rs th e ition number 5.1 It con ists of

ame dme t 1 (2 16-0 ) [doc me ts 3 B/6 1/CDV a d 3 B/6 8/RVC] The te hnic l

Trang 21

In this Re l ne v rsion, a v rtic l l ne in the margin s ows where the te h ic l conte t

is modif ie by ame dme t 1 Addition are in gre n te t, d letions are in strik through

publ c tion

International Stan ard IEC 6 2 9-2 has b en pre ared by s bcommit e 3 B: L w-voltage

f uses, of IEC tec nical commit e 3 : Fu es

This edition in lu es the f ol owin sig if i ant tec nical c an es with resp ct to the previou

edition:

a) f use s stems A an B: modif ied values for the p wer dis ip tion of NH aM f use-l n s;

b) f use s stems A an B: introd ction of dimen ion r for NH f use-l n s;

c) ad ition of new f use s stem K: gK fuse-ln s with contacts for b lted con ection

This p rt is to b u ed in conju ction with IEC 6 2 9-1:2 0 , L w-v ltag fu e – P art 1:

Ge eral re uirements an its Amen ment 1 (2 0 )

This Part 2 s p lements or modif ies the cor esp n in clau es or s bclau es of Part 1

Where no c an e is neces ary, this Part 2 in icates that the relevant clau e or s bclau e

a pl es

Ta les an fi ures whic are ad itional to those in Part 1 are n mb red startin f rom 101 in

fuse s stem A, f rom 2 1 in f use s stem B, etc Ad itional an exes are n mb red AA, BB, etc

This publcation has b en draf ted in ac ordan e with the ISO/IEC Directives, Part 2

A l st of al p rts in the IEC 6 2 9 series, publ s ed u der the general title L w-v lta e fu e ,

can b f ou d on the IEC we site

The commit e has decided that the contents of the b se publ cation an its amen ment wi

"ht p:/ we store.iec.c " in the data related to the sp cif i publcation At this date, the

IMPORTANT – Th 'colour in ide' logo on the cov r pa e of this publ c tion indic te

that it contains colours whic are consid re to be us f ul f or the cor e t

understa ding of its conte ts Us rs s ould theref ore print this doc me t usin a

colour printer

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IEC 6 2 9 con ists of the f ol owin p rts, u der the general title L w-v lta e fu e :

Part 1: General req irements

Part 2: Sup lementary req irements f or fuses f or u e by authorized p rson (fuses mainly

f or in u trial a pl cation) – Examples of stan ardized s stems of f uses A to K

Part 3: Sup lementary req irements f or fuses f or u e by u s i ed p rson (fuses mainly f or

hou ehold or simi ar a pl cation) – Examples of stan ardized s stems of fuses A to F

Part 4: Sup lementary req irements f or fuse-ln s for the protection of semicon u tor

devices

Part 5: Guidan e for the a pl cation of low-voltage fuses

Part 6: Sup lementary req irements f or f use-l n s for the protection of solar photovoltaic

energ s stems

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Fu es f or u e by authorized p rson are general y desig ed to b u ed in in tal ation where

the fuse-l n s are ac es ible to, an may b re laced by, authorized p rson only

Fu es f or u e by authorized p rson ac ordin to the fol owin f use s stems also comply with

the req irements of the cor esp n in s bclau es of IEC 6 2 9-1, u les otherwise def i ed

in this stan ard

This stan ard is divided into fuse s stems, e c de l n with a sp cif i example of

stan ardized f uses for u e by authorized p rson :

Fu e s stem A: Fu es with fuse-l n s with blade contacts (NH f use s stem)

Fu e s stem B: Fu es with striker f use-l n s with blade contacts (NH f use s stem)

Fu e s stem C: Fu e- ais (NH fuse s stem)

Fu e s stem D: Fu e-b ses f or bu b r mou tin (NH f use s stem)

Fu e s stem E: Fu es with fuse-l n s f or b lted con ection (BS b lted fuse s stem)

Fu e s stem F: Fu es with f use-l n s havin c l n rical contact ca s (NF c l n rical fuse

s stem)

Fu e s stem G: Fu es with f use-l n s with of fset blade contacts (BS cl p-in f use s stem)

Fu e s stem H: Fu es with fuse-l n s havin "gD" an "gN" c aracteristic (clas J clas L

an clas T time delay an non time delay fuse typ s)

Fu e s stem I gU f use-l n s with wed e tig tenin contacts

Fu e s stem J: Fu es with f use-l n s havin "gD clas CC" an "gN clas CC"

c aracteristic (clas CC time delay an non-time delay f use typ s)

Fu e s stem K: gK fuse-l n s with blade f or b lted con ection – Hig f use-l n ratin s

f rom 1 2 0 A up to 4 8 0 A (master f use-l n s)

NOT Th a o e-me tio e fu e s stems are sta d rdiz d s stems in re p ct to th ir s fety a p cts Th

Natio al Commite s c n s le t fom th e ample of sta d rdiz d fu e o e or more s stems for th ir own

sta d rd

1.2 Normativ ref ere c s

The fol owin doc ments, in whole or in p rt, are normatively ref eren ed in this doc ment an

are in isp n a le for its a pl cation For dated ref eren es, only the edition cited a pl es For

u dated ref eren es, the latest edition of the referen ed doc ment (in lu in an

IEC 6 1 2, M eth d for the d eterminatio of the pro f a d th c mp rativ tra kin indic s of

s lid in ulatin materials

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IEC 6 6 4-1, I ns latio c ord in tio for e uipme t within low-v ltag s stems – P art 1:

P rin iple , re uireme ts a d te ts

IEC 6 9 9 (al p rts), Co n ctin d evic s – Ele tric l c p er c ndu tors – Safety

re uireme ts for s rew-y e a d s rewle s-y e clampin u its

IEC 6 9 9-1, Co n cting de ic s – Electric l c p er c ndu tors – Safety re uireme ts for

s rew-typ a d s rewles - y e clamping u its – P art 1: Ge eral re uireme ts a d p rtic lar

re uireme ts for clampin u its for c nductors fom 0,2 mm

2

u to 35 mm

2

(in lud ed)

IEC 6 9 9-2, Co n ctin devic s – Electric l c p er c nductors – Safety re uireme ts for

s rew-y e a d s rewles -typ clampin u its – P art 2: P artic lar re uireme ts for clamping

u its for c nd uctors a o e 35 mm

2

u to 3 0 mm

2

(in luded)

ISO 6 8 , Meta ic a d oth r n n org nic c ating – Sulfur diox id e te t with g n ral

Trang 25

The folowin ad itional req irements a ply to f uses with f use-l n s havin blade contacts

inten ed to b re laced by me n of a device, for example, re lacement han le (se Fig re

10 ), whic compl es with the dimen ion sp cif ied in Fig res 101 an 10 Su h f uses have

rated c r ents up to an in lu in 1 2 0 A an rated voltages up to an in lu in 1 0 0 V a.c

or 1 5 0 V d.c

The fol owin c aracteristic of the fuses are sp cif ied in ad ition to IEC 6 2 9-1:

• minimum rated bre kin ca acities;

• time-c r ent c aracteristic ;

• I t c aracteristic ;

• stan ard con ition of con tru tion;

• p wer dis ip tion an ac e ta le p wer dis ip tion

p rts of a f use-l n whic are en aged with the re lacement han le or the f use-car ier

Note 1 to e try: Grip in -lu s ma b ma e of metal or in ulatin material Metal grip in -lu s ma b lv or n t

lv u d r s rvic c n itio s

2.1.10

l v gripping-lu s

metal grip in -lu s electricaly con ected to the blade contacts of the fuse-l n

Note 1 to e try: Metal grip in -lu s with ut ele tric l c nta t to th bla e c nta ts are als d eme to b lv in

c s of in d q ate cre p g dista c s a d cle ra c s a c rdin to this sta d rd

2.1.10

isolate grip ing-lug

not-lve grip in -lu s made of in ulatin material or metal

Note 1 to e try: If th y are ma e of metal th re uire cre p g dista c s a d cle ra c s a c rdin to th

rele a t o erv lta e c te ory s o ld b met b twe n th grip in -lu s a d th bla e c nta ts a wel a b twe n

th grip in -lu s a d th fu e-b s c nta ts

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For a.c the stan ard values of rated voltage are 4 0 V, 5 0 V an 6 0 V For d.c the rated

voltages are 2 0 V an 4 0 V The stan ard values of d.c rated voltage are not related to the

stan ard values of a.c rated voltage F r example, the f ol owin stan ard combination are

p s ible: 5 0 V a.c an 2 0 V d.c 5 0 V a.c an 4 0 V d.c 5 0 V a.c etc

The rated voltage of fuse-b ses ac ordin to Fig re 10 is 6 0 V or hig er

5.3.1 Rate c r e t of the fus -l nk

For e c size the maximum rated c r ents are given in Fig re 101 These values de en

up n the uti zation categories an rated voltages

A rated c r ent of 2 4 A is ad ed to the values as given in 5.3.1 of IEC 6 2 9-1

5.3.2 Rate c r e t of the f us -holder

The rated c r ent f or the dif ferent sizes of the f use-b ses is given in Fig re 10

5.5 Rate power dis ipation of a f us -l nk a d rate a c ptable power dis ipation of

a fu e-holder

The maximum values of rated p wer dis ip tion for the dif ferent sizes of fuse-l n s are

sp cif ied in Fig re 101 The values a ply to the maximum rated c r ents of the f use-l n s The

values of ated ac e ta le p wer dis ip tion of fuse-b ses are given in Fig re 10

5.6 Limits of time-c r e t c ara teristic

5.6.1 Time-c r e t c ara teristic , time-c r e t zone a d ov rloa c rv s

The toleran e on time-c r ent c aracteristic given by the man facturer s al not deviate by

more than ±10 % in terms of c r ent The time-c r ent zones given in Fig re 10 , in lu in

man facturin toleran es s al b met by al pre-arcin an total times me s red at the test

voltage ac ordin to 8.7.4

5.6.2 Conv ntion l time a d c r e ts

The con entional times an c r ents, in ad ition to the values of IEC 6 2 9-1, are given in

Trang 27

For "gG" f use-ln s the gates given in Ta le 10 a ply in ad ition to the gates of IEC 6 2 9-1

Table 10 – Gate f or spe if ie pre-arcing a d operating time of "gG" f us -l nk

A

I

ma(5 s)

A

I

min(0,1 s)

A

I

ma(0,1 s)

5.7.2 Rate bre king c pa ity

The minimum rated bre kin ca acities are sp cified in Ta le 10

Table 10 – Minimum rate bre kin c pa itie

IEC 6 2 9-1 a pl es with the fol owin s p lementary req irements

Fu e-ln s an f use-holders whic me t the req irements an tests of fuse s stem A of this

stan ard may b marked with IEC 6 2 9-2

6.1 Markin s of f us -holders

In ad ition to IEC 6 2 9-1, the f ol owin markin a pl es:

– size

The markin of the rated c r ent an the rated voltage s al b dis ernible from the front

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6.2 Markin s of f us -l nk

In ad ition to IEC 6 2 9-1, the fol owin markin a pl es:

– size or referen e;

– rated bre kin ca acity

The markin of the rated c r ent an the rated voltage s al b dis ernible f rom the front

Furthermore, f use-l n s s al b marked as des rib d in Ta le 10

Table 10 – Marking of fu e-l nk

a

For 4 0 V gG, a blu c lo r is als p rmite

Fu e-l n s with isolated grip in -lu s may b marked in a place e si y visible from the front

with the gra hical s mb l of a grip in -lu in a s uare If marked, conformity of these fu

se-l n s is verified ac ordin to 7.2

NOT Se Fig re 1 2 for d taie dime sio s of th s mb l

7 Sta dard conditions f or construction

IEC 6 2 9-1 a pl es with the fol owin s p lementary req irements

7.1 Me ha ic l de ign

The dimen ion of fuse-l n s an fuse-b ses are given in Fig res 101 an 10

7.1.2 Conne tions, includin termin ls

There are dif f erent kin s of terminals As far as lu terminals are con erned, the ran e of

cros -section whic the terminals s al b ca a le of ac e tin res lts from the f olowin

ran es of ated c r ents of f use-ln s of e c size

Terminals desig ed f or u pre ared con u tors s al b ca a le of ac e tin as a minimum

thre con ec tive sizes of con u tors within the cros -sectional ran es given in Ta le 10 In

case the terminal is a lu terminal (se IEC 6 9 9 series), the torq es whic s al b a pl ed

are given in Ta le 1 1 Torq e values for other terminals s ould b given in the

man facturer’s in tru tion

Trang 29

Table 10 – Minimum cros -s ctional ra ge of unprepare conductors

0a

Not alowe f or n w in talatio s e c pt for fu e-ln s withstrik rs

Con ection of larger an /or smal er cros -sectional are may b neces ary This can b

ac ieved either by the con tru tion of the terminal or by ad itional me n of con ection as

recommen ed by the man f acturer

Whether the terminals f or u pre ared con u tors are s ita le for co p r, aluminium or co p r

an aluminium s al b marked ac ordin ly Furthermore, the ran e of cros -section s al b

marked on or ne r to the clampin sad le or given in the man f acturer's l terature

7.1.3 Fus -conta ts

The contact s rf aces of f use-ln s an fuse-b ses s ould b si ver plated; otherwise, it s al

b verified that contactin is not imp ired in normal o eration If the s rf ace platin of the

blade contacts of a f use-l n or the contacts of the f use-b se is other than si ver, the test

ac ordin to 8.10 s al b p s ed con u ted with d mmies d mmy f use-l n s as des ribed in

8.10.1 Permis a le combination of s rface platin s al b def i ed by the man facturer

If f use-l n s are inten ed to b removed or in erted u der lo d, the con tru tion of the fuse, in

p rtic lar the f use-contacts, s ould b s ita le f or this purp se

7.1.6 Construction of f us -ba e

The d namic s ort-circ it with tan of the f use s al – whenever ne ded – me t the c t-of f

c r ents as given in Ta le 1 2

Fu e-b ses s al me t the temp rature rise test ac ordin to 8.3 in lu in al protective

covers inten ed to b u ed

7.1.7 Construction of a f us -l n

The prefer ed con tru tion is as folows: the blade contacts s al b made of sol d material If

an other con tru tion of blade contacts is u ed the man f acturer s al demon trate that this

con tru tion is adeq ate f or the purp se

With the ex e tion of the atac ment f or the re lacement han le, the en plates are not

p rmited to protru e radial y from the in ulation b d F r some a pl cation it is pref era le

to in ulate the grip in -lu s from l ve p rts

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Fu e-l n s s al have an in icator Electrical y con u tive p rts of in icators s al not b

ejected from the fuse-ln d rin o eration

7.2 Ins latin propertie a d s itabi ity f or ins lation

The cre p ge distan es an cle ran es of the fuses an f use-ac es ories s al me t the

req irements of IEC 6 6 4-1 f or overvoltage category I an p l ution degre 3 The

minimum cle ran es are also a plca le to metal p rts whic are not p rmanently lve but

may b tou hed They s al not b diminis ed d rin re lacement of the f use-l n The

cre p ge distan es b twe n isolated metal grip in -lu s an l ve p rts are c osen ac ordin

to the rated voltage divided by

3

For in ulation stres ed only for a s ort time, the cre p ge distan es of isolated metal

grip in -lu s cor esp n in to two voltage ste s lower may b u ed

In ulatin p rts of the f use-b se s p ortin l ve p rts have to p s the test at PTI 4 0 car ied

out ac ordin to IEC 6 1 2 u in test solution A

2

t c ara teristic

For the f use-l n s covered by this f use s stem, the maximum pre-arcin I t values given in

Ta le 7 of IEC 6 2 9-1 a ply for the maximum o eratin I t values Values f or rated c r ents

lower than 16 A an for 2 4 A are given in Ta le 10

Table 10 – Pre-arcing a d o erating I

min

I2

Trang 31

t max

A2

n2

NOT For a v lta e of 2 0 V a.c th ma imum o eratin I t v lu is 12 I

n2

These values a ply f or the prosp ctive c r ents cor esp n in to pre-arcin times les than

0,01 s

7.8 Ov rc r e t dis rimination of f us -l n s

gG f use-l n s in series with rated c r ent ratio of 1:1,6 an rated c r ents 16 A an a ove

have to dis riminate up to the values sp cif ied in 8.7.4

With regard to dis rimination when circ it-bre kers are u ed, the f ol owin I t values in Ta le

Op ration of the f use-l n s is con idered safe when car ied out by authorized p rson ,

in tru ted in electrical maters, u in re lacement han les ac ordin to this f use s stem or

l n ed f use-car iers In ulatin covers an /or phase se arators may b u ed where

a pl ca le

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IEC 6 2 9-1 a pl es with the folowin s p lementary req irements

8.1.4 Ar a geme t of th f us a d dime sions

The req irements of 7.2 are verif ied on f use-b ses The f use-b ses are con ected to

con u tors havin the minimum an maximum cros -section of the ran e as given in

Ta le 10

In the case of isolated metal grip in -lu s, the cre p ge distan es an cle ran es of the

f use-l n ac ordin to 7.2 are verif ied The cle ran es are also verif ied on a f use-ln in erted

The in ulatin pro erties of isolated metal grip in -lu s may o tional y b verif ied by an

impulse with tan voltage test The relevant rated impulse with tan voltage is given in Ta le

1 0 with referen e to the rated voltage of the f use-l n

Table 1 0 – Rate impuls withsta d volta e

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8.2.3.3 Te t method

Five impulses of b th p larities an of the s a e 1,2/5 µs ac ordin to IEC 6 0 0-1 an at

the rated with tan voltage level ac ordin to Ta le 1 0 are a pl ed to the test o ject The

minimum p riod b twe n the impulses s al b 1 s

If not otherwise sp cif ied, the imp dan e of the impulse generator s ould not ex e d 5 0 Ω

NOT Se IEC 6 0 0- , IEC 6 0 0-2 a d IEC 6 0 0-3 f or a d taie d s riptio of th te t e uipme t

8.2.4 Ac eptabi ty of te t re ults

8.2.4.3 No f las -over or pu cture s al oc ur d rin the test Partial dis harges are ig ored

Fu e-ln s with metal grip in -lu s without electrical contact to the blade contacts whic do

not comply with the req irements of 7.2 are not con idered as isolated in service They ne d,

however, to f ulf il the req irements of 8.9.2 an 8.1 1.8

8.2.5 Re ista c to tra king

The test of in ulatin p rts s p ortin l ve p rts of the fuse-ln s (f use b d ) an f use-b ses

is car ied out ac ordin to IEC 6 1 2 u in test solution A Five sp cimen s al b tested

an s al p s at PTI 4 0 Ceramic isolators ne d not to b tested

8.3 Verif ic tion of temperature ris a d power dis ipation

8.3.1 Ar a geme t of th fu e

If the man facturer sp cif ies values of torq e, they s al b u ed for the tests of 8.3 an 8.10

If not, the s rews or n ts of the terminals s al b f astened in ac ordan e with Ta le 1 1

In case the test ar an ement contain more than one fuse, the test sp cimen are mou ted in

the con entional service p sition on a wo den plate or other in ulatin material at a distan e

b twe n centre l nes of 3 times e e

2

ac ordin to Fig re 101

Co p r b rs as u ed f or 5 0 A to 1 2 0 A test c r ents are p inted mat blac

Table 1 1 – Torq e to be appl e to th terminal s rews

Not alowe f or n w in talatio s e c pt for fu e-ln s with strik rs

8.3.2 Me s reme t of the temperature ris

Protective covers an fuse-car iers as provided by the man facturer s al b mou ted

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8.3.4.1 Temperature ris of th fu e-holder

The d mmy is given in Fig re 10 The p int at whic the temp rature rise is me s red is

marked with E in Fig re 10

8.3.4.2 Power dis ipation of a fu e-l nk

The p ints b twe n whic the p wer dis ip tion of a f use-l n is me s red are marked with S

in Fig re 10

8.4.3.1 Verif ic tion of conv ntional non-f using a d f usin c r e t

In the case where the non-f usin c r ent test is also u ed f or the verif i ation of the time

c r ent c aracteristic, a secon test sp cimen s al b u ed for b)

8.4.3.5 Conv ntional c ble ov rloa prote tion te t (f or "gG" fus -l n s only)

NOT Th te ts in IEC 6 2 9- are d eme to giv s tisfa tory re ults at 1,4 I

n

in ty ic l thre -p a e

a plc tio s at a ambie t temp rature of 3 °C A s e ial te t c n b re uire b s me c u trie to pro e th t

fu e a d miniature circ it-bre k rs (MCBs) are e uiv le t prote tiv d vic s Detais of th s e ial te t are giv n

in An e A

8.5.5 Te t method

Subclau e 8.5.5 of IEC 6 2 9-1 a ples with the fol owin ad ition

8.5.5.1 Verific tion of the pe k with ta d c r e t of a f us -ba e

The verif i ation of the p ak with tan c r ent of a f use-b se ne d not b car ied out, if this

has alre d b en verif ied d rin the bre kin ca acity test of the fuse-l n s with the hig est

ratin of the size

8.5.5.1.1 Ar a geme t of the f us

The test s al b of the sin le-phase typ The test set-up for the f use-b se s al b in l ne

with 8.5.1 of IEC 6 2 9-1

The c r ent s al b l mited by a fuse-l n of the hig est ratin f or the p rtic lar size The

p ak values of the test c r ents atained s al l e in the ran es s own in Ta le 1 2

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8.5.5.1.2 Te t method

The test s al b p r ormed on two f use-b ses In the case of fu e-b se no 1, a hardened

an p ls ed test k if e of ste l, s own in Fig re 10 , s al b in erted by han in order to

o en up the contacts to a certain extent The purp se of this test is to en ure that the resi ent

sprin travel is l mited to the elastic ran e The contacts s al b o ened up thre times This

test wi b disp n ed with if a mec anical sto l mits the ga to les than 7 mm so that the

test blade can ot be cor ectly f ited by han Fu e-b se no 2 is tested in ac ordan e with

8.1 1.2 The values of F

ma

ac ordin to Ta le 1 8 s al b ad ered to Af ter these pre-tests

the a ove-mentioned c r ent test s al b p r ormed

8.5.5.1.3 Ac eptabi ty of te t re ults

The fu e-l n s s al not b ejected There s al b no sig s of arcin or weldin or other

damage l kely to prevent further u e of the fu e-b ses Pitin mark on the contacts are

p rmis ible

8.5.8 Ac eptabi ity of te t re ults

The f use or circ it-bre ker for protection of the source s al not o erate d rin this test

8.7.4 Verif ic tion of ov rc r e t dis rimination

The overc r ent dis rimination f or fu es with rated c r ent up to 12 A an the overc r ent

dis rimination ratio of 1:1,6 f or fu es with rated c r ents hig er than 12 A is verif ied by the I t

values evaluated f om the recorded test res lts

The samples are ar an ed as f or the bre kin ca acity tests no 1 an no 2 ac ordin to 8.5

an Ta le 2 , column No.2, of IEC 6 2 9-1:2 14 regardin the test circ it an toleran e of

c r ent

Four samples are tested, two samples are tested at the r.m.s prosp ctive test c r ent I,

cor esp n in to the minimum pre-arcin I t values, the other samples at the r.m.s

prosp ctive test c r ent I, cor esp n in to the o eratin I t values

The test voltage for 6 0 V a.c is 1,0 ×

3nU

The test voltage for al other f uses is 1,1 ×

3nU

The test voltage for al fu es is

3

1,1

nU

⋅

with toleran es of – % / + %

Prosp ctive c r ents for minimum pre-arcin I t an maximum o eratin I t are +/– %

Trang 36

I

r.m.s

I2

The evaluated I t values s al l e within the cor esp n in I t l mits sp cified in Ta le 1 3

8.9 Verif ication of re ista c to he t

These tests a ply to fuse-l n s an fuse-b ses

Fu e-holders fit ed with f use-l n s havin the maximum p wer dis ip tion cor esp n in to

the ac e ta le p wer dis ip tion of the f use-holder s al b c cl cal y lo ded as

pre-tre tment The pre-tre tment is sp cified in 8.4.3.2 of IEC 6 2 9-1 Af ter co l n to normal

temp rature the bre kin ca acity s al b tested at I

1

in ac ordan e with 8.5 of IEC 6 2 9-1

Trang 37

Fu e-l n s containin organic material in the b d or f il er s al b s bjected to the same test

as des rib d a ove These fuse-ln s s al inter upt the test c r ents I

1

an I

8.9.1 Fus -ba e

The test given b low s ould b a pl ed if it is not o viou that the comp nents are not

af f ected ad ersely by the given temp rature an with rawal f orces

8.9.1.1 Te t ar a geme t

A d mmy fuse-ln ac ordin to Fig re 10 is f ited into a fuse-b se an also s sp n ed from

a me s rin device as s own, for example, in Fig re 10 The man er in whic the d mmy

is fited an sec red (f or example, by loc in pin ), in fuse-b ses s al en ure that he t

dis ip tion is not seriou ly af fected The con u tor cros -section de en s up n the rated

c r ent (se IEC 6 2 9-1, Ta le 17), an the con ection outside the he tin c amb r s al

b at le st 1 m lon The test set-up is in tal ed in s c a he tin c amb r or b low a

he ta le cowl of at le st 5 l ca acity, care b in taken to se that the bu hin s etc f or the

me s rin faci ty an con ection are s ita ly se led The he ters s al b s c as to

en ure that d rin the test seq en e des rib d b low a temp rature of (

5

08+

) °C is

maintained with or without the test c r ent, the temp rature b in me s red at a horizontal

distan e of 15 mm from the d mmy centre p int

8.9.1.2 Te t method

The temp rature in the he tin c amb r is raised to (

5

08+

) °C, an maintained f or 2 h The

d mmy is then lo ded with a proximately 16 % rated c r ent with a toleran e of ± % for

2 h The test may b car ied out at red ced voltage

Af ter lo din an 3 min af ter switc in of f , a ten i e force F

ma(se Ta le 1 8) is a pl ed

smo thly to the d mmy The force F

ma

is exerted f or a period of 15 s

8.9.1.3 Ac eptabi ty of te t re ults

Af ter this test the contact pieces of the fuse-b se s al not have moved to s c an extent as

to af f ect the f urther u e of the f use-b se Af ter pul n out of the d mmy the dimen ion of

Fig re 10 are to b con idered The in ulatin mou tin p rt of the f use-b se s al neither

b broken nor s al it s ow an sig s of crac s

8.9.2 Fus -l nk with grippin -lugs of moulde material or of metal fix d in mould d

material

8.9.2.1 Te t ar a geme t

A f use-l n of the hig est ratin for a size is f ited into a fuse-b se; it s al b ar ested there

an also s sp n ed from a me s rin device as s own in Fig re 10

8.9.2.2 Te t method

The temp rature in the he tin c amb r is raised to (

5

08+

) °C an maintained f or 2 h The

f use-l n is then lo ded with 15 % rated c r ent u ti it o erates, but the test is restricted to

the con entional time A red ced test voltage may b u ed Thre min tes af ter the f use-l n

has o erated or the con entional testin time has expired, a ten ie f orce F

ma(se

Ta le 1 8) is a pl ed smo thly to the grip in -lu s The force is exerted f or a p riod of a out

15 s

Trang 38

8.9.2.3 Ac eptabi ty of te t re ults

The grip in -lu s s al remain ful y o erational, an the len th of the nec (

50

052,

,+

) mm in

p rtic lar s al not b ex e ded by more than 2 mm, in ke pin with the dimen ion d of

Fig re 101 The same a pl es to the maximum values of dimen ion c

8.10 Verific tion of non-deterioration of conta ts

8.10.1 Ar a geme t of th fus

The d mmy f use-l n is given in Fig re 10 The d mmy f use-l n s own with si ver plated

blade contacts is re resentative for f use-l n s with siver plated blade contacts If the non

-deterioration test proves that a s rf ace platin of the blade contacts of a f use-ln other than

siver f ulf ils the req irements, then the s rf ace of the blade contacts of the d mmy f use-ln

s al b plated ac ordin ly

For lu terminals, the torques are given in Ta le 1 1

The in ulation of the con u tors s al b removed over the whole len th Al covers of

contacts an terminals s al b removed for this test only

8.10.1.1 Conta ts

Subclau e 8.10.1 of IEC 6 2 9-1 a ples

8.10.1.2 Dire t terminal clamps

Subclau e 8.10.1 of IEC 6 2 9-1 a ples with the f ol owin ad ition :

The test s al b p rf ormed on 10 direct terminal clamps of f i e f use-b ses

The test ar an ement s al b as fol ows: the f use-b ses s al b mou ted in a vertical

p sition, side by side with a distan e b twe n the f use-b se centres of at le st thre times e ,

s own in Fig re 101 The test of direct terminal clamps whic can b u ed for co p r as wel

as aluminium con u tors s al b made with aluminium con u tors

If there is no inf ormation given by the man f acturer, the s rews of the direct terminal clamps

s al b tig tened with a torq e ac ordin to Ta le 1 4

NOT 1 Th torq e are b s d o a fictio c eff i ie t of µ = 0,12 for thre d a d h a of th s rew a d a

Trang 39

Table 1 4 – Torq e to be ap l e wh n no v lue are giv n by the ma uf acturer

Direct terminal clamps only for co p r con u tors are tested l ke direct terminal clamps for

aluminium with the ex e tion that cle nin an storage are not neces ary Furthermore, f or

co p r clamps, the test can b p rt of the test of contacts If the req irements f or the contacts

af ter 2 0 c cles (se 8.10.2.1) are met, the clamps for co p r have satis ed this req irement

The con u tor cros -section de en s up n the rated c r ent (for co p r con u tors se

Ta le 17 of IEC 6 2 9-1)

The relevant cros -section f or aluminium con u tors are given in Ta le 1 5

Table 1 5 – Cros -s ctional are of aluminium conductors f or te ts

The contact are of six con u tors s al b pre ared as f ol ows

The con u tors s al b cle ned with a s ita le a rasive an con ected within a time not

gre ter than 5 min

Trang 40

The remainin f our con u tors, af ter removin only the in ulation an the gre se, s al b

stored in o rs f or 14 day These u cle ned con u tors s al not b tre ted b f ore b in

con ected

The b lts of the clamps s al b f i ed as stated by the man f acturer A re dju tment of the

b lts d rin the tests is not al owed

For stran ed aluminium con u tors, it s al b en ured that the test c r ent go s into the

cros -section as eq aly as p s ible This can b ac ieved by weldin or compres in

the con u tor in the mid le of its len th

8.10.2 Te t method

A test c cle con ists of a lo d p riod an a no-lo d p riod ref er ed to as the con entional

time The test c r ents for the lo d p riod an the no-lo d p riod are sp cified as f ol ows

Test c r ent: con entional non-f usin c r ent I

f

L ad p riod: 2 % of the con entional time se Ta le 2 of IEC 6 2 9-1

No-lo d p riod: 10 % of the con entional time

A test voltage lower than the rated voltage may b u ed

Durin the no-lo d p riod the samples are co led down to a temp rature lower than 3 °C;

ad itional co l n (for example, a f an) is al owed

The temp rature rise is me s red in ac ordan e with 8.10.2 of IEC 6 2 9-1at rated c r ent

The voltage dro s al b me s red af ter 5 c cles an 2 0 c cles an , if neces ary, af ter

f

%

The voltage dro s al b c an ed into the resistan e of the contacts Bef ore me s rement,

the sample s al b co led down to ro m temp rature If the ro m temp rature T d rin the

me s rement deviates from 2 °C, the fol owin f ormula may b a pled:

1

2020

−+

=

TR

R

αT

The relevant co f ficient α

Tiêu đề	IEC 60269-2:2016 - Low-voltage fuses – Part 2 : Supplementary requirements for fuses for use by authorized persons
Trường học	International Electrotechnical Commission
Chuyên ngành	Electrical Standards and Compliance
Thể loại	Standards Document
Năm xuất bản	2016
Thành phố	Geneva

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