High Speed Fuses - Cooper Bussmann

1 93 high Speed FusesHigh SpeedFusesSection ContentsPageGeneral Applications .. 94-95 North American Fuses & accessories ..94-113 DFJ - high Speed Class J fuse ..97 Square Body Fuses & accessories .. 114-176BS 88 Fuses & accessories ..177-185 Ferrule Fuses & accessories..186-206 Power FactorFor other power factorvalues, the total clearingintegral can becalculated as a multipleof the clearing integrals,the correction factor Kand the correction VoltageThis curve gives thepeak arc voltage, UL,which may appearacross the fuse during itsoperation as a functionof the applied workingvoltage, Eg, (rms) at apower factor of 15%.Power LossesWatts loss at rated current is given in theelectrical curve allows the calculation of the powerlosses at load currentslower than the rated current.

2 The correctionfactor, Kp, is given as afunction of the RMS loadcurrent, Ib, in % of therated current .Cut-Off CurrentA fuse operation relating to short-circuits only. When a fuseoperates in its current-limiting range, it will clear a short-circuit in less than 1 2cycle. Also, it will limit the instantaneouspeak let-through current to a value substantially less thanthat obtainable in the same circuit if that fuse were replacedFor product data sheets, visit Speed FusesProspective Current in Amps RMSPeak Let-Through Current102 1022103104105103104105106 ABGeneral ApplicationsRated VoltageThe AC voltage rating of Cooper Bussmann Fuses is givenin volts rms. Fuses tested to IEC are tested at 5% abovetheir rated voltage.

3 British Style BS 88 Fuses are tested at10% above its rated voltage. UL recognition tests are performed at the rated CurrentRated current is given in amps rms. Cooper Bussmann fusescan continuously carry the rated CharacteristicThe meltingcharacteristicshows the virtualmelting time inseconds as afunction of theprospective currentin amperes Fuses arespeciallyconstructed forshort-circuitprotection againsthigh level faultcurrents. Loadingand operation ofthe fuse in the non-continuous/dashedsection of the meltcurve must beavoided. The curvecan also be readas the real meltingtime as a function of the RMS value of the pre-arc IntegralsThe total clearing I2t atrated voltage and atpower factor of 15% aregiven in the electricalcharacteristics.

4 Forother voltages, theclearing I2t is found bymultiplying by correctionfactor, K, given as afunction of appliedworking voltage, Eg,(rms).10410310210122468 2102246810324626410026410126426426464262 4 Prospective Current In Amperes RMSV irtual Pre-Arcing Time In Seconds10 410 310 210 200 300 400 500 600 COS 300 400 500 600 40 50 607080 90 100%IbFor product data sheets, visit SpeedFusesHigh Speed FusesGeneral Applicationswith a solid conductor of equal asymmetrical currentB symmetrical currentParallel ConnectionWhen Fuses are connected in parallel it is recommended thatthe applied voltage does not exceed UN(the rated voltage of the fuse ). This is due to the fact that the energyreleased within the Fuses may be unevenly shared betweenthe parallel connected Fuses are connected in parallel, one must take intoaccount that the current sharing is not necessarily equal.

5 Andit must be checked, that the maximum load current is ConnectionFuses in series may not equally divide the applied voltage. Itis recommended that series connected Fuses should only beoperated at fault currents that yield melting times less than10 ms and a recovery voltage per fuse of less than or equalto UN(the rated voltage of the fuse ).Mounting GuidanceThe recommendations below have to be followed whenmounting a Cooper Bussmann fuse with end plate Screw in studs: 5 N m Max, 3 N m Min2. Attachment of the fuse to bussbar by means of nut and washer:TThhrreeaaddTToorrqquuee ((NN mm))**CCoonnffiigguurraattiioonnMMaaxxMM iinn5 16 18, M825203 8 16, M1045403 8 2445401 2 13, M1265501 2 206550*1 N m = lb-ftOverloadsThe design of Cooper Bussmann Fuses is such that theycan be operated under rather severe operating conditionsimposed by overloads (any load current in excess of themaximum permissible load current).

6 In applications, there will be a maximum overload current,Imax, which can be imposed on the fuse with a corresponding duration and frequency of durations fall into two categories:1. Overloads longer than one second2. Overloads less than one second termed impulse following table gives general application guidelineswhich, in the expression Imax < (% factor) x It. Itis the melting current corresponding to the time t of the overloadduration as read from the time-current curve of the fuse . Theguidelines in the table below determine the acceptability ofthe selected Fuses for a given ooff OOccccuurrrreenncceeOOvveerrllooaaddss ((>> 11 sseecc))IImmppuullssee LLooaaddss ((<< 11 sseecc))Less than once per month Imax< 80% x ItImax< 70% x ItLess than twice per week Imax< 70% x ItImax< 60% x ItSeveral times per dayImax< 60% x It When impulse loads are an intrinsic/normal parameter of theload current either as single pulse or in trains of pulses orwhen their level is higher than the melting current at (per time-current curve)

7 , contact Cooper Bussmannfor application addition to the parameters set forth in the preceding table,the RMS value of the load current as calculated for any period of 10 minutes or more should not exceed the maximum permissible load , it is important that a fuse should not be appliedin the non-continuous/dashed portion of the associated time-current time-current combination point which falls in the non-continuous/dashed portion of the time-current curve isbeyond the capability of the fuse to operate OperationDepending upon the short-circuit time constant and the magnitude of the prospective short-circuit current, the dcvoltage at which a fuse can be applied may be less than itsac rating. Long time constants require a lower dc , however, higher available prospective short-circuit currents result in faster fuse openings and thus permita fuse to be operated at a higher DC CooperBussmann for additionalinformation and applica-tion assistance whenfuses have to operateunder DC Current VersusConductor CrossSectionReduction of permissibleload current when the conductor cross section is less thanthat given in IEC Publication 269-1 & 4 valid for CooperBussmann high Speed AssistanceIf you have application problems or need a fuse outside ourstandard program, please contact the nearest CooperBussmann representative.

8 Phone numbers are shown on theback (IEC cross section)Reduction FactorIntroductionNorth American ContentsCatalogAmpNumberVoltsRangePageDF J6001-60097 FWA1301000-400098-99 FWA15070-1000100-101 FWX25035-2500102-103 FWH50035-1600104-105 KAC6001-1000106 KBC60035-800107 FWP7005-1200108-110 FWJ100035-2000111-112 AccessoriesFuse Bases113 North American fuse RangesAAmmppssVVoollttssAACCDDCC1000-400 0130XX70-1000150XX35-2500250XX35-1600500 XX1-1000600X 5-1200700XX40-600800 X35-20001000X For product data sheets, visit Speed FusesNorth American FusesGeneral InformationCooper Bussmann offers a complete range of NorthAmerican blade and flush-end style Fuses and design and construction were optimized to provide.

9 Low energy let-through (I2t) Low watts loss Superior cycling capability Low arc voltage Excellent DC performanceNorth American style Fuses provide an excellent solution formedium power applications. While there are currently nopublished standards for these Fuses , the industry hasstandardized on mounting centers that accept Cooper Bussmann RatingAll Cooper Bussmann North American style Fuses are testedat their rated voltage. Cooper Bussmann should be consultedfor applications exceeding those and internal open fuse indication is available forselected portions of the North American line. fuse blocks areavailable for most product data sheets, visit SpeedFusesHigh Speed FusesSpecificationsDescription: high Speed , current-limiting Cooper Bussmann Drive fuse will provide maximumprotection for AC and DC drives and controllers and meetNEC branch circuit protection requirements.

10 The Drive Fusehas the lowest I2t of any branch circuit fuse to protect powersemiconductor devices that utilize diodes, GTOs, SCRs :See page 15 for Class J :Melamine tube with silver fuse :Volts 600 Vac (or less), 450 Vdc (or less)Amps 1-600 AIR 200kA RMS Sym., 100kA DCAgency Information:CE, Std. 248-8, Class J, UL Listed,Guide JDDZ, File E4273, CSA Certified, Class 1422-02, and Benefits Easily coordinated with existing and new variable Speed drives and electric controllers. Standard Class J dimensions allowing the use of readilyavailable fuse blocks, holders, and switches. Allows the lowest let-thru energy of any branch circuit overcurrent protective Applications Protection of ac & dc drives Equipment using power semi-conductor devicesCatalog Numbers (Amps)DFJ-1 DFJ-15 DFJ-70 DFJ-225 DFJ-2 DFJ-20 DFJ-80 DFJ-250 DFJ-3 DFJ-25 DFJ-90 DFJ-300 DFJ-4 DFJ-30 DFJ-100 DFJ-350 DFJ-5 DFJ-35 DFJ-110 DFJ-400 DFJ-6 DFJ-40 DFJ-125 DFJ-450 DFJ-8 DFJ-45 DFJ-150 DFJ-500 DFJ-10 DFJ-50 DFJ-175 DFJ-600 DFJ-12 DFJ-60 DFJ-200 Data Sheet.