Fuji Electric FA components & Systems Co., Ltd./D & C Catalog Information subject to change without notice 08/25 08 Low Voltage Fuses General information AFaC and BaC type current-limiting fuses These fuses have a high interrupting capacity of 100kA at 600V AC or DC and are suitable for power and control circuits. The fuse is a plug-in type, and it can easily be replaced by removing a screw cap. ■ Rated current: 3 – 400 Amps For further information see page 08/26. FCF and FCK type current-limiting fuses These fuses are provided with special links with low-temperature melting characteristics, and are suitable for general power circuits because of their high interrupting capacity and good current-limiting performance. They are available in two types, a center-blade type and a solid ferrule type, with an insulated fuse body of high quality porcelain. ■ Rated current: 1 – 600 Amps For further information see page 08/29. ■ Description FUJI low voltage current-limiting fuses are designed to give protection to power supply and distribution circuits and equipment such as motor starter and semiconductors. Since they can be supplied in a variety of types and ratings any circuit capacities can be accurately matched. FUJI current-limiting fuses have a high interrupting capacity and will prevent thermal and mechanical damage from heavy short circuits. 20 35 50 100 200 Semi- conductor protection BLC, CR and CS type Super Rapid Fuses These fuses are used exclusively for the protection of semiconductors, thyristors and silicon diodes. Since their total clearing I 2 t is very small protective coordination with semi-conductors is very easily carried out. ■ Rated current: BLC type: 12 – 140 Amps CR type: 30 – 600 Amps CS type: 40 – 4700 Amps For further information see page 08/31. (CS fuse: Typical value) AF97-635,634 AF97-642 AF97-635,634 ■ Quick selection table Series Voltage Interrupting capacity rms sym (kA) Application AFaC 600V AC DC 3 to 100 Amps General use BaC 125 to 200 Amps 250 to 400 Amps FCF 500V AC 1 to 60 Amps General use FCK 500V AC 3 to 600 Amps BLC 550V AC 12 to 140 Amps CR2L(S) 250V AC 10 to 600 Amps CR6L 600V AC 20 to 600 Amps CS5F 500V AC 40 to 1500 Amps CS10F 1000V AC 80 to 1500 Amps CS15F 1500V AC 450 to 1250 Amps
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Fuji Electric FA components & Systems Co., Ltd./D & C CatalogInformation subject to change without notice 08/25
08
Low Voltage FusesGeneral information
AFaC and BaC type current-limitingfusesThese fuses have a high interruptingcapacity of 100kA at 600V AC or DCand are suitable for power and controlcircuits. The fuse is a plug-in type, andit can easily be replaced by removing ascrew cap.■ Rated current: 3 – 400 AmpsFor further information see page 08/26.
FCF and FCK type current-limitingfusesThese fuses are provided with speciallinks with low-temperature meltingcharacteristics, and are suitable forgeneral power circuits because of theirhigh interrupting capacity and goodcurrent-limiting performance.They are available in two types, acenter-blade type and a solid ferruletype, with an insulated fuse body of highquality porcelain.■ Rated current: 1 – 600 AmpsFor further information see page 08/29.
■ DescriptionFUJI low voltage current-limiting fusesare designed to give protection to powersupply and distribution circuits andequipment such as motor starter andsemiconductors.Since they can be supplied in a varietyof types and ratings any circuitcapacities can be accurately matched.FUJI current-limiting fuses have a highinterrupting capacity and will preventthermal and mechanical damage fromheavy short circuits.
20 35 50 100 200
Semi-conductorprotection
BLC, CR and CS typeSuper Rapid FusesThese fuses are used exclusively for theprotection of semiconductors, thyristorsand silicon diodes. Since their totalclearing I2t is very small protectivecoordination with semi-conductors isvery easily carried out.■ Rated current:BLC type: 12 – 140 AmpsCR type: 30 – 600 AmpsCS type: 40 – 4700 AmpsFor further information see page 08/31.
08/26Fuji Electric FA components & Systems Co., Ltd./D & C Catalog
Information subject to change without notice
AFaC and BaC type current-limiting fuses600V AC/DC, 3–400 Amps■ DescriptionThe AFaC and BaC type have anexcellent current-limiting performancewith an interrupting capacity as high as100kA at 600V AC/DC. They aresuitable for power circuits and controlcircuit applications including generalpower cubicles, distribution equipment,motor starters, load centers and controlcenters. The fuse assembly comprisesbase, screw cap, fuse link and adapterring. The universal surface mountingterminals are provided with screwswhile the rear connection type aresupplied with stud bolts. The fuse linkcan easily and safely be replaced bysimply removing a screw cap.The diameter of the solid ferrule fuselink varies according to the ratedcurrent. The higher the rating, thegreater the diameter.As a safety feature the screw cap canonly be tightened when the fuse linkmatches with the adapter ring locatedinside the base. This prevents the capfrom being tightened even when fuse
Low Voltage FusesAFaC and BaC types
AF97-634 O-1299
AFaC-60 BaC-100 60A 200ARear connection type Surface connection type
link with larger ratings is inserted. Theoperating blown indication tip can beobserved through the screw capwindow. The tip color indicates thecurrent rating – for instance, pinkindicates 3A and red 10A. The tip isejected to show that the fuse hasblown. Both the base and the screwcap are made from a high class
porcelain insulating material to ensuretrouble-free operation. The fuse canbe replaced without isolating the circuit.Since the fuse link is housed in a highlyreliable porcelain barrel it is strongmechanically and thermally with nodanger of explosion or production ofnoxious gases when blown.
■ Components of AFaC and BaC type
Parts
Rated Fuse-link Screw cap Base Adapter ringcurrent Surface connection Rear connection Color of(A) Type Color of indicator Type Type Type Type adapter ring
3 BLA003 Pink Pa30 AFa30 Ba30 R3 Pink 5 BLA005 Brown R5 Brown 10 BLA010 Red R10 Red 15 BLA015 Gray R15 Gray 20 BLA020 Blue R20 Blue 30 BLA030 Violet — —
40 BLA040 Black Pa60 AFa60 Ba60 R40 Black 60 BLA060 Light red — —
■ Ordering informationSpecify the following:1. Type number
Fuse-link BaseBLA 003 AFa 30
Rated current Frame sizeEx. 003 : 3 Amps 30: For 3 to 30A
075 : 75 Amps 60: For 40, 60A200 : 200 Amps 100: For 75, 100A
Fuse-link 200: For 125, 150, 200A400: For 250, 300, 400A
ConnectionAFa: SurfaceBa : RearScrew cap
Pa 30
Frame size 30: For 3 to 30A 60: For 40, 60A100: For 75, 100A200: For 125, 150, 200A400: For 250, 300, 400A
Screw cap
■ Mounting on steel panelTo mount a rear connection base Ba on a steel panel, aninsulting plate and some bushings are used. Kits for 30, 60,100, 200 and 400A base are available. Please specify yourbase type when ordering.Two front bushings are used with 100, 200 and 400A baseonly.Example: Insulating plate and bushings for Ba30
■ Tightening toolIt is recommended that fuses with ratings of over 100A betightened with a special tool since there is the possibility ofoverheating if the screw cap is not adequately tightened.This exclusive use tool is sold separately.
Type Screw cap type
Pa100H Pa100Pa200H Pa200Pa400H Pa400
Low Voltage FusesAFaC and BaC types
AF90-316
AF97-644
Min
ute
Sec
ond
Sec
ondTim
e
Current (A) Available current (Sym, rms) I eff. (kA)
Min
ute
Max
. Le
t-th
roug
h cu
rren
t (P
eak
valu
e) k
A
Tim
e
Current (A)
08/28Fuji Electric FA components & Systems Co., Ltd./D & C Catalog
Fuji Electric FA components & Systems Co., Ltd./D & C CatalogInformation subject to change without notice 08/29
08
FCF, FCK type current-limiting fuses500V ACFCF Up to 60 AmpsFCK Up to 600 Amps
■ DescriptionFCF and FCK HRC fuses use aspecially designed low-temperaturemelting element, a feature of 'dualelement' fuses. There is no fusedeterioration due to overcurrentphenomena such as rush current at thetime of motor starting and they alsofeature time-lag operationcharacteristics. They operate rapidlyand positively in the face of destructiveshort circuit currents. Since they arecurrent-limiting fuses with a highcapacity of 50kA (FCF types: 1 – 60Amps) they are suitable for many typesof power and control circuits. The fuselink is housed in a ceramic barrel with
excellent thermal and mechanicalcharacteristics and is packed in silicasand which prevents arcing. Thusthere are no fears of explosion orproduction of noxious gases. TheFCF's link end is a solid ferrule-typeand available in 1 – 60 Amps ratings.The FCK is a center blade-type andavailable in 3 – 600 Amps ratings.The fuse links for the 75 Amps FCKand larger sizes are provided with ablown fuse indicator.
SD-240
■ Ordering informationSpecify the following:1. Type number
FCF series
Rated Interrupting Fuse-linkcurrent capacity(A) (kA) Type
Interrupting capacityBLC ...... 100kA at 550V ACCR2L .... 100kA at 250V AC
BLC, CR and CS typesSuper Rapid Fuses150–1500 Volts AC10–4700 Amps
■ DescriptionThe FUJI BLC, CR and CS types areextremely reliable fuses which havebeen specially developed to provideprotection for silicon diodes andthyristors and are suitable for invertersusing semiconductors or transformers-rectifiers. FUJI Super Rapid Fuses aredesigned with a very small total I2tvalue which gives them a high speedinterrupting action in the face ofabnormal currents.In addition the arc voltage generated atthe time of interruption has a low valueso that faults will not influence relatedelectric machinery and equipment.These fuses can carry out theprotection of many types of circuitsrating from the semiconductorovercurrents 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 thesound elements will be quickly isolatedfrom the fault circuits.
■ Features• The total clearing I2t is small and the
semiconductor circuit is completelyprotected.
• Since the peak arc voltage at thetime of interruption is low damage toother equipment does not occur.
Low Voltage FusesBLC, CR and CS types
Super Rapid Fuses
Rated Rated Peak Max. Watt Fuse-linkcurrent voltage arc interrupting I2t loss
• The peak arc voltage is obtained by interruption caused by the listedinterrupting current at rated voltage.
• This indcates the values when the conductors specified in ULStandards are connected and rated current apply.
• TÜV: CR2LS, 2L: Up to 350A CR6L: 50 to 300A
Note: UL recognized fuseIn the UL recognized fuses, a fuse with a blown inidcation fuse, or afuse both with a blown indication fuse and a precision switch is alsoUL recognized.Examples: CR2L-200G/UL
CR2LS-30S/ULCR6L-100G/UL
■ CR type fuse with optional accessoryFuse with blown indication fuseCR2L (S)- G
AF88-446
Fuse with blown indication fuse and precision switchCR2L (S)- S Precision switch (SPDT)
CRX-1
AF88-445 AF88-442
precision switch
Fuji Electric FA components & Systems Co., Ltd./D & C CatalogInformation subject to change without notice 08/33
08
■ Dimensions, mm● BLC
BLC012, 020, 023 BLC045 BLC075 to 140
Type Rated A B øD ød Color of Masscurrent indicator (g)(A)
Note: The BLC type fuse link requires a holder in use. The size of theholder differs according to the fuse ratings. Select the most suitableone after referring to the Table on page 08/40.For drawings see page 08/28.
● CR2L-450 or smaller, CR2LS
Low Voltage FusesBLC, CR and CS types
Super Rapid Fuses
Dimensions for reference only. Confirm before construction begins.
08/40Fuji Electric FA components & Systems Co., Ltd./D & C Catalog
Information subject to change without notice
■ Operating indication● Blown fuse indicationFUJI Super Rapid Fuses are availablein BLC, CR and CS types. These typeshave different methods of indicating ablown fuse.● BLC typeA blown fuse is indicated by the colortip on the ferrule of the fuse beingejected as shown in Fig. 1. This can beseen through the window of the fuseholder.● CR typeThis fuse does not have a blownindicator but if a trigger fuse isconnected as shown in Fig. 2 this willprovide the alarm for blown fuse.● CS typeThis fuse is provided with a blown fuseindicator. In this case a pin in thecontact pad is ejected after the fusehas been blown. If electricalconnections for lamps or alarms arerequired fit the contact block (1NO or1NC) to the pad as shown in Fig. 3.
Fig. 1 Fig. 3
Fig. 2
BLC type
CR type
Alarm contact blockAHX2905, 2915
CS 10F with alarmcontact block
■ Alarm contact block ratings
Type Contact Ratedvoltage (V)
AHX2905 1NO 24110220
AHX2915 1NC 440550
Inductive load
Rated operational Ratedcurrent (A) capacity (W)
6 1501.3 1400.45 1000.2 850.15 85
DC
Resistive load
Rated operational Ratedcurrent (A) capacity (W)
6 1502.5 2751 2200.4 1750.3 165
AC
Inductive cosϕ=0.3~1
Rated operational Ratedcurrent (A) capacity (VA)
6 1506 6606 13202.5 11002 1100
■ Fuse holder for BLC type fuseFUJI BLC fuses require specialholders. Select the most suitable onewhich corresponds to the rated currentof the fuse.Dimensions: See page 08/28.
Fuse link Fuse holderBLC Surface connection
Fuse link Rated Base Screw cap Adaptorcurrent Surface Rear ring
Low Voltage FusesBLC, CR and CS typesSuper Rapid Fuses
Line
Load
Alarmcircuit
Alarmcircuit
Triggerfuse
R
F
Fuji Electric FA components & Systems Co., Ltd./D & C CatalogInformation subject to change without notice 08/41
08
■ Application and selection guideBLC, CR and CS-type – Super rapidfuseWhen selecting fuses forsemiconductor rectifier circuit protectionthe following conditions must besatisfied.For additional details contact FUJI.
■ Conditions of application1. The rated interrupting current of the
fuse must be greater than theestimated short circuit current of thecircuit.
Available short Rated interruptingcircuit current current of fuseof rectifier circuit
2. The let-thru current value of fusemust be less than the allowable 1/2cycle surge current value.
Semiconductor – 1/2Fuse let-thru cycle allowable surgecurrent value current 10ms (at 50Hz)
3. The total clearing I2t value which thefuse requires to complete interruptionmust be less than the allowable I2tvalue of semiconductor.
Fuse – total Semiconductor – I2tclearing I2t
4. The rated current of the fuse must begreater than the average forwardcurrent of the semiconductor.
Fuse – Semiconductor –rated current average forward current
5. The rated current and voltage of thefuse must be greater than those ofthe rectifier circuit.
Fuse – rated Rectifier circuit –current andcurrent and voltagevoltage
Method of applicationSemiconductor rectifier equipment hasa variety of rectifier circuits. Taking the3-phase bridge rectifier circuit as anexample – Fig. (a) and (b) as shown inthe following.Although the number of fuses used inthe line fuse method (a) is half thenumber used in the element fusemethod (b), the fuses must have alarger current capacity.
Fig. (a)
Line fuse methodIn this method the fuses are connected tothe AC line side.
Fig. (b)
Element fuse methodIn this method the fuses are connected inseries to the semiconductor element.
■ Fuse ratingsWhen selecting fuses various factorssuch as protection, coordination andload, etc. must be considered.However, in this catalog the mainmatters such as voltage, current and I2tonly are explained.
● Rated voltageThe rated voltage of the fuse indicatesthe maximum operational voltage andthis also indicates the root-mean-square value of the AC sinusoidal wavevoltage. Select fuses having a ratedvoltage exceeding the voltage obtainedby the formula shown in the followingtable. (Fig. 1)Do not select current-limiting fuses withrated voltages drastically exceeding therectifier circuit voltage. It is necessaryto consider the arc voltage.
>= >=
>= >=
>= >=
Fig. 1 Rated voltage required by fusesWire connection Wiring diagram Rated voltage of Fuse (VFN rms)type For line fuse For element fuse
Single-phase bridge VFN a · Ea VFN a · Ea
3-phase bridge VFN a · Ea VFN a · Ea
3-phase, double star VFN a · 3 · Ea VFN a · 3 · Ea
Remarks: The 'a' is a coefficient where the regulation of the AC input voltage is taken into account. Thisis a=1.1 in case of voltage regulation ±10%.
Fig. 2 Element current and line currentWire connection Wiring diagram Element fuse method Line fuse methodtype Element current Ia Line current
Single-phase bridge
3-phase bridge
3-phase, double star
<
<=
<=
>
>
Low Voltage FusesBLC, CR and CS types
Super Rapid Fuses
Ea
Ea
Ea
Ia
Ia
Ia
Id
Id
Id
I
I
I
I
Ia = I = d
= 0.707d
Id√_2_
Ia =
= 0.577dI
Id√_3_ I = Id
= 0.816dI
23
I = Ia =
= 0.289dI
Id2√
_3_
08/42Fuji Electric FA components & Systems Co., Ltd./D & C Catalog
Information subject to change without notice
● Rated currentThe current values in fuses in the linefuse system and the element fusesystem are different. Obtain thecorrect current value from the table onpage 08/41 (Fig. 2).When selecting the rated current of afuse choose a fuse having anamperage rating greater than thecurrent which flows in the semi-conductor if the load is continuous anda fixed current.If the current which flows in thesemiconductor is greater than the ratedcurrent of the fuse connect the fuses inparallel. However, in this case, if thenumbers of fuses arranged in parallelare 'n', then the I2t value of the fuse willbe n2·I2t and n2 times the I2t value ofone fuse. This should be taken intoconsideration when protectivecoordination is taken into account.In the case of the circuit where the loadrapidly varies the fuse element willsuffer from mechanical deteriorationand be damaged by thermal stress.In loads of this type the deteriorationcharacteristics of the fuse must beclosely considered.Moreover if the fuse current – timecharacteristics of the fuse selected isless than the overload characteristicsof the semiconductor element thencomplete protection can be obtained.However, if the semiconductor elementhas a large capacity then protectivecooperation is very difficult to arrange.The fuses are used to isolate theshorted semiconductor element circuitfrom sound operating circuits.
■ Total clearing I2tThe total clearing I2t of fuse is a veryimportant factor when considering theprotective coordination of thesemiconductor. This total clearing I2t isthe value where the arcing I2t is addedto the melting I2t. Therefore it isnecessary to satisfy the followingformula.Fuse – total Semiconductorclearing I2t I2tThe total clearing I2t of fuse dependsupon the operational voltage andinterrupting current.Therefore, for this reason if a 500 Voltsfuse is used in a 300 Volts circuit thetotal clearing I2t is reduced by 50–70%.However, the reduction rate variesaccording to the type of fuseconstruction. This must be checkedand confirmed once more.
ExampleI2tAll I2t values are ampere2 seconds.
The I2t data for silicon diodes orthyristor elements are normally given intheir respective catalogs. If the A2Sdata is not given in their catalog obtainthe value in the following manner. Ifprotection is needed for a 250V, 150A(Io) diode having a maximum allowablepeak half sine wave current of 2700A, itis important that the fuse has a total I2tvalue lower than that of the diode.
Calculation
Maximum I2t diode = ( )2 0.0167
= ( )2 0.0167
= 30,400A2 Sec.
From the table (Page 08/38), the fusewith a total I2t nearest to 30,400A2 Sec.is the 260 Ampere fuse (CR 2L-260).
■ Interrupting currentThe rated interrupting current of thefuse must exceed the maximum value(Symmetrical RMS value) of theestimated circuit fault current.
■ Peak arc voltageIn the case of the current-limiting fusean arc voltage (overvoltage) isgenerated at the time of interruptiondue to its fusible element construction.It is necessary to check that this peakarc voltage does not exceed thesemiconductor's maximum (Non-repetitive peak) reverse voltage value.
■ Current limitationSelect a fuse whose let-thru currentvalue does not exceed the allowable1/2 cycle surge current of thesemiconductor. The allowable surgecurrent is the peak value of the currentwhich in case at 50Hz is allowed toflow for 10ms. In the current-limitingfuse the fault must be cleared in theshortest possible time or in the first1/2 cycle.Available current is the current whichwould flow if the fuse were not current-limiting.This would cause damage toequipment. Let-thru current is theactual current allowed to flow by thecurrent limiting action of the fuse. Anumber of let-thru current graphs aregiven in this catalog and example isgiven in the following paragraph. Themethod of reading this graph isprovided for your reference.
How to find a let-thru current– ExampleFuse: 200 Amps 500VAvailable R.M.S symmetrical current:
100,000 Amps
Let-thru peak current (Instantaneous):11,600 Amps
Let-thru R.M.S. current11,600 ÷ 1.7 = 6,800 Amps
This example clearly shows that whilea 100kA (rms, sym) current isavailable, the fuse limits the current let-thru to 6,800 Amperes (rms, sym).
<=
1 Peak2
27002
Low Voltage FusesBLC, CR and CS typesSuper Rapid Fuses
M:Melting timeA :Arcing timeT :Total clearing time