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fuji electric fa components & systems co., ltd./d & c catalog information subject to change without notice 08/35 08 specifications rated rated peak max. watt fuse-link current voltage arc interrupting i 2 t loss voltage (amp 2 sec.) 10 3 type (a) (v) (w) 12 550v 1550 0.09 5.1 blc012-1 20 ac 1550 0.27 8.5 blc020-1 23 1550 0.39 10 blc023-1 45 1380 1.8 19 blc045-1 75 1250 5 32 blc075-1 90 1250 11.5 38 blc090-1 120 1200 33 51 blc120-1 140 1200 100 59 blc140-1 30 250v max. 0.35 4.0 cr2l-30 50 ac 500 0.85 6.0 cr2l-50 75 2.3 9.0 cr2l-75 100 4.0 12.0 cr2l-100 125 6.5 14.0 cr2l-125 140 7.0 16.0 cr2l-140 150 9.5 18.0 cr2l-150 175 13 21.0 cr2l-175 200 17 23.0 cr2l-200 225 22 26.0 cr2l-225 260 27 30.0 cr2l-260 300 38 35.0 cr2l-300 325 49 37.0 cr2l-325 350 60 37.0 cr2l-350 400 103 39.0 cr2l-400 450 140 46.0 cr2l-450 500 160 48.0 cr2l-500 550 200 51.0 cr2l-550 600 215 56.0 cr2l-600 interrupting capacity blc ...... 100ka at 550v ac cr2l .... 100ka at 250v ac blc, cr and cs types super rapid fuses 150 1500 volts ac 10 4700 amps description the fuji blc, cr and cs types are extremely reliable fuses which have been specially developed to provide protection for silicon diodes and thyristors and are suitable for inverters using semiconductors or transformers- rectifiers. fuji super rapid fuses are designed with a very small total i 2 t value which gives them a high speed interrupting action in the face of abnormal currents. in addition the arc voltage generated at the time of interruption has a low value so that faults will not influence related electric machinery and equipment. these fuses can carry out the protection of many types of circuits rating from the semiconductor overcurrents to destructive short- circuiting faults-i.e. when the sd-36 sm-388 si-431 si-429 blc cr2l cs5f cs10f semiconductors short or circuits fail the sound elements will be quickly isolated from the fault circuits. features the total clearing i 2 t is small and the semiconductor circuit is completely protected. since the peak arc voltage at the time of interruption is low damage to other equipment does not occur. low voltage fuses blc, cr and cs types super rapid fuses rated rated peak max. watt fuse-link current voltage arc interrupting i 2 t loss voltage (amp 2 sec.) 10 3 type (a) (v) (w) 10 250v max. 0.04 1.2 cr2ls-10 20 ac 500 0.17 3.0 cr2ls-20 30 0.35 4.0 cr2ls-30 50 0.85 6.0 cr2ls-50 75 2.3 9.0 cr2ls-75 100 4.0 12.0 cr2ls-100 20 600v max. 0.14 4.0 cr6l-20 30 ac 1200 0.35 7.0 cr6l-30 50 1.8 9.0 cr6l-50 75 3.0 12.5 cr6l-75 100 7.0 15 cr6l-100 150 18 22.0 cr6l-150 200 30 34.0 cr6l-200 250 70 37.0 cr6l-250 300 95 40.0 cr6l-300 350 150 45.0 cr6l-350 400 200 55 cr6l-400 500 390 60 cr6l-500 600 700 70 cr6l-600 interrupting capacity cr2ls . 100ka at 250v ac cr6l .... 100ka at 600v ac high interrupting capacity of 200ka at 1000v ac the cs type is provided with a blown fuse indicator. an alarm contact block (1no or 1nc) can also be attached. ul recognized : cr2l/ul,cr2ls/ul, cr6l/ul (file no. e92312) csa certificated : cr2ls/ul (file no. lo4000-4090) t?v : cr2ls/ul (10-100a), cr2l/ul (150-350a) (rep. no. e9450643e02) cr6l/ul (50-300a) (rep. no. e9560543e02)
08/36 fuji electric fa components & systems co., ltd./d & c catalog information subject to change without notice specifications (ul-recognized, csa certified, t ? v) rated rated inter- max. watt fuse-link current voltage rupting interrupting i 2 t loss capacity (amp 2 sec.) 10 3 type (a) (ka) (w) 10 250v ac 10 at ac 0.04 1.2 cr2ls-10/ul 20 400v dc (pf: 0.8) 0.17 3.0 cr2ls-20/ul 30 10 at dc 0.35 4.0 cr2ls-30/ul 50 (l/r: 2ms) 0.85 6.0 cr2ls-50/ul 75 2.3 9.0 cr2ls-75/ul 100 4.0 12.0 cr2ls-100/ul 150 9.5 18.0 cr2l-150/ul 200 17 23.0 cr2l-200/ul 260 27 30.0 cr2l-260/ul 350 60 37.0 cr2l-350/ul 400 103 39.0 cr2l-400/ul 450 140 46.0 cr2l-450/ul 500 160 48.0 cr2l-500/ul 550 200 51.0 cr2l-550/ul 600 215 56.0 cr2l-600/ul 20 600v ac 100 at ac 0.14 4.0 cr6l-20/ul 680v dc (pf: 0.8) 30 10 at dc 0.35 7.0 cr6l-30/ul (l/r: 2ms) 50 1.8 9.0 cr6l-50/ul 75 3.0 12.5 cr6l-75/ul 100 7.0 15.0 cr6l-100/ul 150 100 at ac 18 22.0 cr6l-150/ul (pf: 0.8) 200 50 at dc 30 34.0 cr6l-200/ul (l/r: 2ms) 300 95 40.0 cr6l-300/ul specifications rated inter- max. watt fuse-link current rupting interrupting i 2 t loss capacity (amp 2 sec.) 10 3 type (a) (ka) (w) 4700 150 at 14000 310 cs1f-4700 125v ac 2000 150 at 1950 124 cs2f-2000 3000 250v ac 5500 216 cs2f-3000 40 200 at 1 6.4 cs5f-40 75 500v ac 3.5 12 cs5f-75 100 5 17 cs5f-100 150 10 25 cs5f-150 200 18.5 34 cs5f-200 250 33 42 cs5f-250 300 64 45 cs5f-300 350 85 56 cs5f-350 400 122 57 cs5f-400 450 131 62 cs5f-450 500 159 73 cs5f-500 600 257 80 cs5f-600 800 600 114 cs5f-800 1000 1200 110 cs5f-1000 1000 843 167 cs5f-1000-p 1200 1800 114 cs5f-1200 1200 1311 200 cs5f-1200-p 1500 3600 209 cs5f-1500 1000 200 at 1800 125 cs8f-1000 1200 800v ac 2500 176 cs8f-1200 1500 4400 220 cs8f-1500 80 200 at 10 17 cs10f-80 100 1000v ac 16 21 cs10f-100 150 37 27 cs10f-150 200 63 37 cs10f-200 250 110 44 cs10f-250 300 148 53 cs10f-300 350 211 70 cs10f-350 400 307 74 cs10f-400 500 420 90 cs10f-500 560 410 102 cs10f-560 630 450 135 cs10f-630 750 640 156 cs10f-750 800 1259 211 CS10F-800-P 1000 1722 245 cs10f-1000-p 1250 2250 330 cs10f-1250-p 1500 3200 334 cs10f-1500-c 450 100 at 350 134 cs15f-450 630 1500v ac 760 170 cs15f-630 900 1400 280 cs15f-900-p 1250 3050 350 cs15f-1250-p note: peak arc voltage cs1f ..... max. 450v cs2f ..... max. 750v cs5f ..... max. 1000v cs8f ..... max. 2000v cs10f ... max. 2000v cs15f ... less than 3000v an alarm contact block ahx2905 (1no) or ahx2915 (1nc) can be attached to cs type. (sold separately) see page 08/44. low voltage fuses blc, cr and cs types super rapid fuses note: peak arc voltage cr2ls, cr2l .... max. 500v cr6l .................. max. 1200v the peak arc voltage is obtained by interruption caused by the listed interrupting current at rated voltage. this indcates the values when the conductors specified in ul standards are connected and rated current apply. t ? v: cr2ls, 2l: up to 350a cr6l: 50 to 300a note: ul recognized fuse in the ul recognized fuses, a fuse with a blown inidcation fuse, or a fuse both with a blown indication fuse and a precision switch is also ul recognized. examples: cr2l-200g/ul cr2ls-30s/ul cr6l-100g/ul cr type fuse with optional accessory fuse with blown indication fuse cr2l (s)- g af88-446 fuse with blown indication fuse and precision switch cr2l (s)- s precision switch (spdt) crx-1 af88-445 af88-442 precision switch
fuji electric fa components & systems co., ltd./d & c catalog information subject to change without notice 08/37 08 dimensions, mm blc blc012, 020, 023 blc045 blc075 to 140 type rated a b d d color of mass current indicator (g) (a) blc012-1 12 50 10 13 10 grey 12 blc020-1 20 50 10 13 14 yellow 12 blc023-1 23 50 10 13 14 violet 12 blc045-1 45 50 10 27 20 white 62 blc075-1 75 63 6 34 5 silver 120 blc090-1 90 63 6 34 8 red 120 blc120-1 120 63 6 47 8 yellow 120 blc140-1 140 63 6 47 8 light red 215 note: the blc type fuse link requires a holder in use. the size of the holder differs according to the fuse ratings. select the most suitable one after referring to the table on page 08/44 . for drawings see page 08/32 . cr2l-450 or smaller, cr2ls low voltage fuses blc, cr and cs types super rapid fuses dimensions for reference only. confirm before construction begins. type a b c d e a b f g h mass cr2l-30 80 58 18 21.5 37 9 11 90 1.5 26.5 42g cr2l-50 cr2l-75 80 58 20 30.5 44 9 11 90 3 32.5 100g cr2l-100 cr2l-125 cr2l-140 cr2l-150 cr2l-175 cr2l-200 85 60 25 33.5 47 11 13 93 3.2 33.5 130g cr2l-225 cr2l-260 cr2l-300 cr2l-325 cr2l-350 95 70 30 42 54 11 13 98 4 39 220g cr2l-400 cr2l-450 cr2ls-10 56 42 12 18.5 34.5 6.5 8.5 78 2 25 28g cr2ls-20 cr2ls-30 cr2ls-50 cr2ls-75 cr2ls-100 note: the dimensions of the fuses with suffix. ul are the same as those of the standard ones. ordering information specify the following: 1. type number type number nomenclature blc 012-1 rated current : 12 to 140a plug-in type super rapid fuse cs 10f-1000 -p/ ul ul recognized (cr2l, cr2ls, cr6l) csa certificated (cr2ls) t ? v (cr2ls, cr2l, cr6l) 2-fuse connected parallel optional accessory (see page 08/44) g: with blown indication fuse s: with blown indication fuse and precision switch rated current 10 to 4700a rated voltage 2l, 2ls: 250v ac, 6l: 600v ac 1f: 150v ac, 2f: 250v ac 5f: 500v ac, 8f: 800v ac 10f: 1000v ac, 15f: 1500v ac cr: barrel-shaped super rapid fuse cs: cubic-shaped super rapid fuse mass: 450g cr2l-500 to -600 d b d a d b a d d a d b blown indicatin fuae (g type) mounting hole a b b h e d c f a g 37 46.5 blown indication fuse (g type) 70 31 41.5 43 46 28 54 84 30 98 84 95 8 mounting hole 11 13
08/38 fuji electric fa components & systems co., ltd./d & c catalog information subject to change without notice dimensions, mm cr6l-20, cr6l-30, cr6l-50 cr6l-75 to 300 cr6l-350 to 600 type a b c d e f g h a b mass (g) cr6l-75 95 70 25 34 47 102 3.2 33.5 11 13 150 cr6l-100 cr6l-150 cr6l-200 107 82 30 42 54 107 4 39 11 13 246 cr6l-250 cr6l-300 type a b c d mass (g) cr6l-350 107 82 43 107 493 cr6l-400 121 96 43 114 522 cr6l-500 cr6l-600 121 96 47.4 114 545 cs1f-4700 cs2f-2000, 3000 cs5f-40 to 1500 cs10f-80 to 750 cs15f-450, 630 cs8f-1000, 1200, 1500 voltage type a b c d m mass (max.) (g) 500v cs5f-40 47 47 42.5 65.5 m8 320 cs5f-75 cs5f-100 cs5f-150 cs5f-200 cs5f-250 57 51 47 70 m8 510 cs5f-300 cs5f-350 cs5f-400 72 51 54.5 77 m10 800 cs5f-450 cs5f-500 cs5f-600 cs5f-800 cs5f-1000 72 51 54.5 77 m12 830 cs5f-1200 cs5f-1500 voltage type a b c d m mass (max.) (g) 800v cs8f-1000 72 74 54.5 84 m12 1060 cs8f-1200 cs8f-1500 72 82 54.5 84 m8 1150 1000v cs10f-80 47 71 42.5 65.5 m8 420 cs10f-100 cs10f-150 57 74 47 70 m8 690 cs10f-200 cs10f-250 cs10f-300 72 74 54.5 77 m10 1060 cs10f-350 cs10f-400 cs10f-500 cs10f-630 cs10f-750 1500v cs15f-450 72 105 54.7 77 m10 1400 cs15f-630 mass: 42g low voltage fuses blc, cr and cs types super rapid fuses 34.5 18 blown indication fuse (g type) mountng hole 6.5 8.5 23.5 18.5 17.5 25 62 47 27 12 88 74 76 2 e blown indication fuse (g type) mountng hole a b h d b c g f a 84 28 41.5 43 46 46.5 30 b 37 54 mountng hole 11 13 8 d c a blown indication fuse (g type) blown fuse indicator alarm contact block ahx2905(no) ahx2915(nc) 2-mio 72 51 72 30 54.5 7 84 max. m a b alarm contat block blown fuse indicator n.p. a c d 7 7 a 7 c 30 a m blown fuse indicator alarm contact block d b mass: 800g
fuji electric fa components & systems co., ltd./d & c catalog information subject to change without notice 08/39 08 dimensions, mm cs5f-p cs10f-p, cs15f-p voltage type h l mass (g) 500v cs5f-1000-p 51 69 1900 cs5f-1200-p 1000v CS10F-800-P 74 92 2420 cs10f-1000-p cs10f-1250-p 1500v cs15f-900-p 105 123 3100 cs15f-1250-p cs10f-1500-c current-limiting characteristic mass: 2500g characteristic curves blc melting time-current characteristic operating time-current characteristic low voltage fuses blc, cr and cs types super rapid fuses m10 n.p. 86 158 5 7 54.5 h l 7 max.77 15 72 40 72 alarm contat block 108 107 89.5 m10 m10 max.77 7 7 74 99 5 m10 alarm contat block 15 72 72 40 time minute second current (a) time second minute current (a) max. let-through current (peak value) ka available current (sym, rms) i eff. (ka)
08/40 fuji electric fa components & systems co., ltd./d & c catalog information subject to change without notice characteristic curves cr2l, cr2ls melting time-current characteristic operating time-current characteristic current-limiting characteristic cr6l melting time-current characteristic operating time-current characteristic current-limiting characteristic low voltage fuses blc, cr and cs types super rapid fuses minute time current (a) minute time current (a) max. let-through current (peak value) ka available current (sym, rms) i eff. (ka) time minute second current (a) time minute second current (a) max. let-through current (peak value) ka available current (sym, rms) i eff. (ka) second second cr6l-20 cr6l-30 cr6l-50 cr6l-75 cr6l-100 cr6l-150 cr6l-200 cr6l-250 cr6l-300 cr6l-600 cr6l-350 cr6l-400 cr6l-500 cr6l-20 cr6l-20 cr6l-20 cr6l-30 cr6l-50 cr6l-75 cr6l-100 cr6l-150 cr6l-200 cr6l-250 cr6l-300 cr6l-600 cr6l-350 cr6l-400 cr6l-500 cr6l-20
fuji electric fa components & systems co., ltd./d & c catalog information subject to change without notice 08/41 08 characteristic curves cs1f melting time-current characteristic cs2f melting time-current characteristic operating time-current characteristic operating time-current characteristic current-limiting characteristic current-limiting characteristic low voltage fuses blc, cr and cs types super rapid fuses minute second time current ( 10 3 a) second minute time current ( 10 3 a) max. let-through current (peak value) ka available current (sym, rms) i eff. (ka) current ( 10 3 a) time minute second time minute second current ( 10 3 a) max. let-through current (peak value) ka available current (sym, rms) i eff. (ka)
08/42 fuji electric fa components & systems co., ltd./d & c catalog information subject to change without notice characteristic curves cs5f melting time-current characteristic cs8f melting time-current characteristic operating time-current characteristic operating time-current characteristic current-limiting characteristic current-limiting characteristic low voltage fuses blc, cr and cs types super rapid fuses minute time current ( 10 3 a) minute time current ( 10 3 a) max. let-through current (peak value) ka available current (sym, rms) i eff. (ka) time minute second current ( 10a) time minute second current ( 10a) max. let-through current (peak value) ka available current (sym, rms) i eff. (ka) second second
fuji electric fa components & systems co., ltd./d & c catalog information subject to change without notice 08/43 08 characteristic curves cs10f melting time-current characteristic cs15f melting time-current characteristic operating time-current characteristic operating time-current characteristic current-limiting characteristic current-limiting characteristic low voltage fuses blc, cr and cs types super rapid fuses minute time second current ( 10a) current ( 10a) minute second time max. let-through current (peak value) ka available current (sym, rms) i eff. (ka) max. let-through current (peak value) ka available current (sym, rms) i eff. (ka) minute second time current ( 10 3 a) current ( 10 3 a) minute second time
08/44 fuji electric fa components & systems co., ltd./d & c catalog information subject to change without notice operating indication blown fuse indication fuji super rapid fuses are available in blc, cr and cs types. these types have different methods of indicating a blown fuse. blc type a blown fuse is indicated by the color tip on the ferrule of the fuse being ejected as shown in fig. 1. this can be seen through the window of the fuse holder. cr type this fuse does not have a blown indicator but if a trigger fuse is connected as shown in fig. 2 this will provide the alarm for blown fuse. cs type this fuse is provided with a blown fuse indicator. in this case a pin in the contact pad is ejected after the fuse has been blown. if electrical connections for lamps or alarms are required fit the contact block (1no or 1nc) to the pad as shown in fig. 3. fig. 1 fig. 3 fig. 2 blc type cr type alarm contact block ahx2905, 2915 cs 10f with alarm contact block alarm contact block ratings type contact rated voltage (v) ahx2905 1no 24 110 220 ahx2915 1nc 440 550 inductive load rated operational rated current (a) capacity (w) 6 150 1.3 140 0.45 100 0.2 85 0.15 85 dc resistive load rated operational rated current (a) capacity (w) 6 150 2.5 275 1 220 0.4 175 0.3 165 ac inductive cos ? =0.3~1 rated operational rated current (a) capacity (va) 6 150 6 660 6 1320 2.5 1100 2 1100 fuse holder for blc type fuse fuji blc fuses require special holders. select the most suitable one which corresponds to the rated current of the fuse. dimensions: see page 08/32 . fuse link fuse holder blc surface connection fuse link rated base screw cap adaptor current surface rear ring connection connection type (a) type type type type blc012-1 12 afa30 ba30 pa30 r20 blc020-1 20 afa30 ba30 pa30 blc023-1 23 afa30 ba30 pa30 blc045-1 45 afa60 ba60 pa60 blc075-1 75 afa100 ba100 pa100 r75 blc090-1 90 afa100 ba100 pa100 blc120-1 120 afa200 ba200 pa200 blc140-1 140 afa200 ba200 pa200 af88-446 sh-384 sm-385 cs10f sd-36 sd-36 af88-439 low voltage fuses blc, cr and cs types super rapid fuses line load alarm circuit alarm circuit trigger fuse r f
fuji electric fa components & systems co., ltd./d & c catalog information subject to change without notice 08/45 08 application and selection guide blc, cr and cs-type ?super rapid fuse when selecting fuses for semiconductor rectifier circuit protection the following conditions must be satisfied. for additional details contact fuji. conditions of application 1. the rated interrupting current of the fuse must be greater than the estimated short circuit current of the circuit. available short rated interrupting circuit current current of fuse of rectifier circuit 2. the let-thru current value of fuse must be less than the allowable 1/2 cycle surge current value. semiconductor 1/2 fuse let-thru cycle allowable surge current value current 10ms (at 50hz) 3. the total clearing i 2 t value which the fuse requires to complete interruption must be less than the allowable i 2 t value of semiconductor. fuse total semiconductor i 2 t clearing i 2 t 4. the rated current of the fuse must be greater than the average forward current of the semiconductor. fuse semiconductor rated current average forward current 5. the rated current and voltage of the fuse must be greater than those of the rectifier circuit. fuse rated rectifier circuit current and current and voltage voltage method of application semiconductor rectifier equipment has a variety of rectifier circuits. taking the 3-phase bridge rectifier circuit as an example fig. (a) and (b) as shown in the following. although the number of fuses used in the line fuse method (a) is half the number used in the element fuse method (b), the fuses must have a larger current capacity. fig. (a) line fuse method in this method the fuses are connected to the ac line side. fig. (b) element fuse method in this method the fuses are connected in series to the semiconductor element. fuse ratings when selecting fuses various factors such as protection, coordination and load, etc. must be considered. however, in this catalog the main matters such as voltage, current and i 2 t only are explained. rated voltage the rated voltage of the fuse indicates the maximum operational voltage and this also indicates the root-mean- square value of the ac sinusoidal wave voltage. select fuses having a rated voltage exceeding the voltage obtained by the formula shown in the following table. (fig. 1) do not select current-limiting fuses with rated voltages drastically exceeding the rectifier circuit voltage. it is necessary to consider the arc voltage. > = > = > = > = > = > = fig. 1 rated voltage required by fuses wire connection wiring diagram rated voltage of fuse (v fn rms) type for line fuse for element fuse single-phase bridge v fn a e a v fn a e a 3-phase bridge v fn a e a v fn a e a 3-phase, double star v fn a 3 e a v fn a 3 e a remarks: the 'a' is a coefficient where the regulation of the ac input voltage is taken into account. this is a=1.1 in case of voltage regulation 10%. fig. 2 element current and line current wire connection wiring diagram element fuse method line fuse method type element current i a line current single-phase bridge 3-phase bridge 3-phase, double star < < = < = > > low voltage fuses blc, cr and cs types super rapid fuses e a e a e a i a i a i a i d i d i d i i i i ia = i = d = 0.707d id _ 2 _ ia = = 0.577di id _ 3 _ i= id = 0.816di 2 3 i = ia = = 0.289di id 2 _ 3 _
08/46 fuji electric fa components & systems co., ltd./d & c catalog information subject to change without notice rated current the current values in fuses in the line fuse system and the element fuse system are different. obtain the correct current value from the table on page 08/48 (fig. 2). when selecting the rated current of a fuse choose a fuse having an amperage rating greater than the current which flows in the semi- conductor if the load is continuous and a fixed current. if the current which flows in the semiconductor is greater than the rated current of the fuse connect the fuses in parallel. however, in this case, if the numbers of fuses arranged in parallel are 'n', then the i 2 t value of the fuse will be n 2 i 2 t and n 2 times the i 2 t value of one fuse. this should be taken into consideration when protective coordination is taken into account. in the case of the circuit where the load rapidly varies the fuse element will suffer from mechanical deterioration and be damaged by thermal stress. in loads of this type the deterioration characteristics of the fuse must be closely considered. moreover if the fuse current time characteristics of the fuse selected is less than the overload characteristics of the semiconductor element then complete protection can be obtained. however, if the semiconductor element has a large capacity then protective cooperation is very difficult to arrange. the fuses are used to isolate the shorted semiconductor element circuit from sound operating circuits. total clearing i 2 t the total clearing i 2 t of fuse is a very important factor when considering the protective coordination of the semiconductor. this total clearing i 2 t is the value where the arcing i 2 t is added to the melting i 2 t. therefore it is necessary to satisfy the following formula. fuse total semiconductor clearing i 2 ti 2 t the total clearing i 2 t of fuse depends upon the operational voltage and interrupting current. therefore, for this reason if a 500 volts fuse is used in a 300 volts circuit the total clearing i 2 t is reduced by 50 70%. however, the reduction rate varies according to the type of fuse construction. this must be checked and confirmed once more. example i 2 t all i 2 t values are ampere 2 seconds. the i 2 t data for silicon diodes or thyristor elements are normally given in their respective catalogs. if the a 2 s data is not given in their catalog obtain the value in the following manner. if protection is needed for a 250v, 150a (i o ) diode having a maximum allowable peak half sine wave current of 2700a, it is important that the fuse has a total i 2 t value lower than that of the diode. calculation maximum i 2 t diode = ( ) 2 0.0167 = ( ) 2 0.0167 = 30,400a 2 sec. from the table ( page 08/38 ), the fuse with a total i 2 t nearest to 30,400a 2 sec. is the 260 ampere fuse (cr 2l-260). interrupting current the rated interrupting current of the fuse must exceed the maximum value (symmetrical rms value) of the estimated circuit fault current. peak arc voltage in the case of the current-limiting fuse an arc voltage (overvoltage) is generated at the time of interruption due to its fusible element construction. it is necessary to check that this peak arc voltage does not exceed the semiconductor's maximum (non- repetitive peak) reverse voltage value. current limitation select a fuse whose let-thru current value does not exceed the allowable 1/2 cycle surge current of the semiconductor. the allowable surge current is the peak value of the current which in case at 50hz is allowed to flow for 10ms. in the current-limiting fuse the fault must be cleared in the shortest possible time or in the first 1/2 cycle. available current is the current which would flow if the fuse were not current- limiting. this would cause damage to equipment. let-thru current is the actual current allowed to flow by the current limiting action of the fuse. a number of let-thru current graphs are given in this catalog and example is given in the following paragraph. the method of reading this graph is provided for your reference. how to find a let-thru current ?example fuse: 200 amps 500v available r.m.s symmetrical current: 100,000 amps let-thru peak current (instantaneous): 11,600 amps let-thru r.m.s. current 11,600 1.7 = 6,800 amps this example clearly shows that while a 100ka (rms, sym) current is available, the fuse limits the current let- thru to 6,800 amperes (rms, sym). < = 1 peak 2 2700 2 low voltage fuses blc, cr and cs types super rapid fuses m:melting time a :arcing time t :total clearing time 105,000 100,000a available rms symmetrical current(ampere) let-thru available let-thru peak current(amperes)-peak 11,600 200a peak let-thru current (actual short-circuit current) time current m t a peak current of first half cycle of available peak current (ac component) short circuit current that would pass without current- limiting fuse. dc component available instantaneous peak current pf=1

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