Medium Voltage. Fuses. Fuses Medium Voltage Contents

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1 June 0 Sheet 0 s Medum Voltage.0- s Medum Voltage Contents s Medum Voltage General Descrpton Lmtng s Expulson s Techncal s Specfcatons See Eaton s Cutler-Hammer Product Specfcaton Gude on enclosed CD-ROM: CSI Format: Secton 0 CSI Format: Secton Lmtng s CA000E For more nformaton vst:

2 .0- s Medum Voltage General Descrpton June 0 Sheet 0 General Descrpton Medum Voltage s Eaton s Cutler-Hammer entry n the power fuse busness began over 0 years ago under Westnghouse Electrc. In, Westnghouse ntroduced the medum voltage borc acd expulson fuse followed by the medum voltage current lmtng fuse. Even today, medum voltage fuses contnue to use the core Westnghouse technology. Eaton contnues to buld on the Westnghouse technology legacy by engneerng hgher performance, cost-effectve power fuse products. Table.0-. Cutler-Hammer Medum Voltage Famly Lmtng HLE: Helcal Confguraton Lmtng, E-rated CLE: Lmtng, E-rated CLS: Lmtng Starter (motor starter) HCL: Lmtng, Clp-mount, E-rated CX: Lmtng, C-rated CLPT: Lmtng, E-rated Table.0-. Applcaton Gude Type Voltage Ampere Range (kv) Lmtng Maxmum Interruptng (ka Sym.) Table.0-. Power Ampere Characterstc s Defnton Cutler-Hammer medum voltage fuses are manufactured and tested to the requrements of the ANSI C.X seres of standards. Eaton s the only North Amercan manufacturer of both current lmtng and expulson medum voltage power fuses. A full range of general purpose, backup and borc acd fuses s avalable for dstrbuton and power applcatons. Class Use Indoor/Outdoor CLE.. 0A General Purpose Indoor/Outdoor CLPT. 0.E 0 General Purpose Indoor CLS.. R R 0 Backup Dstrbuton Indoor CX/...C 00C 0 General Purpose Dstrbuton Indoor HCL.. A 00A General Purpose Dstrbuton Indoor HLE.. General Purpose Indoor/Outdoor Expulson s RBA. 0.E. Borc Acd Power Indoor RDB. 0.E. Borc Acd Power Outdoor DBU. E, K 0K 0 Borc Acd Power Indoor/Outdoor DBA. 0.A. Borc Acd Power Outdoor Expulson All Cutler-Hammer medum voltage fuses are thoroughly tested and conform to ANSI specfcatons. Some motor starter fuses are UR recognzed and both current lmtng and expulson fuses have been approved n UL rated swtchgear. lmtng and expulson fuses can be used to meet any overcurrent protecton need. At any pont along the medum voltage electrcal dstrbuton system, Eaton has a fuse to satsfy your overcurrent protecton needs. RBA: Refllable, Borc Acd RDB: Refllable, Dropout, Borc Acd DBU: Dropout, Borc Acd, Indoor/Outdoor S&C Substtute DBA: Dropout, Borc Acd, Outdoor Appled n: d swtches, feeder crcut sectonalzng, power transformers, dp poles, substaton capactor banks. Potental transformers. BAL- mountngs and clps are no longer avalable. AMPGARD and non-ampgard Motor Starters. HCLS verson s the same as the CLS except hermetcally sealed for hazardous locatons. Pad Mounted dstrbuton transformers, Substaton servce transformers, and fused swtches. Drect substtuton for McGraw s NX fuse. Pad Mounted dstrbuton transformers. d Swtches, Feeder Crcuts, Power Transformers, Substaton, Capactor Banks d swtches, feeder crcut sectonalzng, and power transformers. Feeder crcut sectonalzng, power transformers, substaton servce transformers, dp poles, potental transformers, and substaton capactor banks. Outdoor verson of the RBA. Feeder crcut sectonalzng, fused swtches, power transformers, substaton servce transformers, dp poles, and potental transformers. Drect substtute for S&C s SMU- reflls. Only DBA- and DBA- fuse unts are avalable. DBA- fuses superseded by DBA-. DBA hardware no longer avalable. E R C A s rated or below wll melt n 00 seconds at some current value between.0 and. tmes the E number. s rated above wll melt n 00 seconds at some current value between. and. tmes the E number. The fuse wll melt n to seconds when the current equals 0 tmes the R number. The fuse wll melt n 00 seconds at some current value between. and. tmes the C number. Class A fuses have parameters that do not fall wthn the 'C', 'E', or 'R' defntons above. For more nformaton vst: CA000E

3 June 0 Sheet 0 s Medum Voltage General Descrpton.0- General Descrpton The followng fuse termnology wll assst n understandng and selectng the correct fuse. The followng s a bref overvew of those terms. Power vs. Dstrbuton The dfferentaton s ntended to ndcate the test condtons and where fuses are normally appled n a power system, based on specfc requrements for generatng sources, substatons and dstrbuton lnes. Each class has ts own unque set of voltage, current and constructon requrements (see ANSI C.,.,. and.). Low vs. Medum vs. Hgh Voltage Whle fuses are defned n the ANSI standards as ether low or hgh voltage, Eaton s electrcal busness has elected to name ther fuses to correspond wth the equpment n whch they are nstalled. Therefore, per ANSI C, fuses are named as follows: Low Voltage Medum Voltage Hgh Voltage 00 V and below Greater than 00 V to,000 V Greater than,000 V Expulson vs. Lmtng Defntons per ANSI C.0 Expulson : An expulson fuse s a vented fuse n whch the expulson effect of the gases produced by nternal arcng, ether alone or aded by other mechansms, results n current nterrupton. An expulson fuse s not current lmtng and as a result lmts the duraton of a fault on the electrcal system, not the magntude. Lmtng : A current lmtng fuse s a fuse that, when ts current responsve element s melted by a current wthn the fuse s specfed current lmtng range, abruptly ntroduces a hgh resstance to reduce current magntude and duraton, resultng n subsequent current nterrupton. Table.0-. General Comparson Expulson Lmtng Vented Electromechancal Interrupts at Zero Generally Hgher Voltage s Dfferent Tme/ Characterstcs Sealed Statc Lmts Fault Generally Hgher Interruptng s Dfferent Tme/ Characterstcs Lmtng Types There are three current lmtng fuse types: Backup, General Purpose and Range. It s mportant that the user have an understandng of these defntons to nsure proper applcaton of the fuse (Fgure.0-). Backup : A fuse capable of nterruptng all currents from the maxmum rated nterruptng current down to the rated mnmum nterruptng current. Backup fuses are normally used for protecton of motor starters and are always used n seres wth another nterruptng devce capable of nterruptng currents below the fuse s mnmum nterruptng current. General Purpose : A fuse capable of nterruptng all currents from the rated nterruptng current down to the current that causes meltng of the fusble element n no less than one hour. General Purpose fuses are typcally used to protect feeders and components such as transformers. Range : A fuse capable of nterruptng all currents from the rated nterruptng ratng down to the mnmum contnuous current that causes meltng of the fusble element, wth the fuse appled at the maxmum ambent temperature specfed by the manufacturer. Lmtng Type max. mn. hr. Interruptng maxmum rated nterruptng current mnmum rated nterruptng current current causng element meltng n hour any current meltng element wth no tme lmt Fgure.0-. Lmtng Types Protecton Range Backup General Purpose Range hr. mn. max. CA000E For more nformaton vst:

4 .0- s Medum Voltage General Descrpton June 0 Sheet 0 Lmtng s CLE, HLE and HCL s CLPT/NCLPT Lmtng E-Rated for Potental Transformer Protecton CLS Lmtng for Motor Starter Protecton CX Lmtng Cross-References wth Cooper Power System s NX Type HCL Lmtng for Transformer Protecton End Fttngs lmtng fuses are constructed wth pure slver fuse elements, hgh purty slca sand fller, and a glass resn outer casng. A hgh fault current melts the slver element almost nstantly and loses energy to the surroundng sand. The sand melts and forms fulgurte, a glass-lke substance. The arc voltage rapdly ncreases to nearly three tmes the fuse voltage ratng and forces the current to zero. Low fault current melts a solder drop on the slver fuse element whch, n turn, melts the slver. The element burns back untl there s a suffcent nternal gap to nterrupt the current. Ths s known as the M-effect. Eaton offers current lmtng fuses n two basc types: backup and general purpose. Backup fuses are appled n seres wth another crcut protectve devce such as a contactor or an expulson fuse, to nterrupt hgh fault currents beyond the other devce s range. General purpose fuses are desgned to nterrupt low fault currents that cause t to melt n one hour or less. Accessores A wde assortment of mountngs, lve parts and end fttngs are avalable to facltate power fuse nstallaton. Mountngs Mountngs nclude a base, porcelan or glass polyester nsulators, and lve parts. They help enable the fuse to be safely attached to the gear. Mountngs can be ether dsconnect or nondsconnect. Lve Parts Lve Parts attach the fuse to the nsulators and are consdered part of the mountng. All parts above the nsulators are lve parts. For more nformaton vst: CA000E

5 June 0 Sheet 0 s Medum Voltage Techncal s.0- Techncal s Table.0-. CLE, HLE, HCL & CLS s Descrpton Famly CLE HLE HCL CLS Secton General Class General Purpose General Purpose General Purpose Backup Use Power Power Power Dstrbuton Maxmum kv Maxmum ka 0 0A 0A 00E R R Mountng Clp Clp, Bolt-on, Hookeye Clp Lock Clp, Bolt-on, Hookeye Indcator Standard Standard Standard Standard Approvals IEEE, ANSI IEEE, ANSI IEEE, ANSI UL, IEEE, ANSI Applcatons Feeder Crcuts Motor Starters PTs & CTs LV Breakers Substaton Servce Transformers Capactor Banks d Swtches Table.0-. CLPT, CX, CLT & DSL s Descrpton Famly CLPT CX CLT DSL Secton Call Factory General Class General General General Back-up Use Dstrbuton Dstrbuton Dstrbuton Dstrbuton Maxmum kv V Maxmum ka E.C 00C Mountng Clp Clp Stud Bolt-on Bolt-on Indcator Optonal None None None Approvals IEEE, ANSI IEEE, ANSI IEEE, ANSI UL Applcatons Feeder Crcuts Motor Starters PTs & CTs LV Breakers Substaton Servce Transformers Capactor Banks d Swtches CA000E For more nformaton vst:

6 .0- s Medum Voltage General Descrpton June 0 Sheet 0 Expulson s RBA E-Rated Refllable Borc Acd Eaton s Cutler-Hammer expulson fuses use borc acd as the nterruptng medum. Under a fault condton, arc heat decomposes the borc acd nto water vapor. The water vapor blast deonzes the arc path preventng arc re-gnton after a natural current zero. Type RBA ndoor expulson fuses must be ftted wth a dscharge flter or condenser, that moderates the dscharge exhaust. The dscharge flter lmts the exhaust to a small and relatvely nert amount of gas and lowers the nose level wthout affectng the fuse nterruptng ratng. Steam dscharge, that can effect the nterruptng, s fully restrcted by the condenser. RDB E-Rated Refllable Outdoor Dropout Borc Acd Type RDB outdoor dropout fuses nclude an ejector sprng whch forces the arcng rod through the top of the fuse. The arcng rod strkes a latch on the mountng whch forces the fuse to swng outward through a 0 arc nto the dropout poston. Refll unts can be feld nstalled nto RBA and RDB expulson fuses. Once the operated unt has been removed, the separately purchased unt can be easly nstalled nto the fuse holder. DBU Dropout Borc Acd for Use Indoors, Insde Swtchgear or Outdoors Type DBU fuse unts are desgned for new and aftermarket utlty applcatons. End fttngs are avalable, n both ndoor and outdoor versons, as well as lve parts and mountngs. Flters, Condensers and Mufflers Flters and condensers are for ndoor applcatons of RBA expulson fuses. They confne the arc wthn the fuse and substantally reduce the nose and exhaust when the fuse nterrupts. Mufflers perform the same functon for the DBU fuse, wthout deratng. Accessores The followng accessores are avalable for expulson fuses: Mountngs Mountngs nclude a base, porcelan or glass polyester nsulators, and lve parts. They help enable the fuse to be safely attached to the gear. Mountngs can be ether dsconnect, nondsconnect or dropout. s may be vertcal or underhung. Lve Parts Lve Parts attach the fuse to the nsulators and are consdered part of the mountng. All parts above the nsulators are lve parts. End Fttngs End Fttngs are metal parts that attach to each end of the fuse at the ferrules. They are used only on dsconnect fuses or when convertng a nondsconnect to a dsconnect fuse. For more nformaton vst: CA000E

7 June 0 Sheet 0 s Medum Voltage Techncal s.0- Techncal s Table.0-. Transformer Prmary Applcaton System Maxmum Transformer kva Voltage Type Self-Cooled Forced Ar 00 Lmtng Lmtng 00 Lmtng 00 Lmtng 0 Lmtng 0 0 Expulson 00 Expulson Expulson 0 Expulson 0 0 Expulson Famly/Characterstcs Type Range CLE CLE CLE CLE-0 CLE-0 RBA-0 RBA-00 RBA-00 DBU- CLE-0 CLE-0 RBA-0 RBA-00 RBA-00 DBU- CLE-0 CLE-0 RBA-0 RBA-00 RBA-00 DBU- CLE RBA-0 RBA-00 RBA-00 CLE RBA-0 RBA-00 RBA-00 DBU Maxmum kv Maxmum transformer kva ratngs are based on ratos of maxmum fuse current ratng to transformer full load current (I F /I T ) as lsted. For a C rse lqud-flled transformer, use the kva ratng for C rse ( C ratng x.). For suggested mnmum fuse applcatons, see Tables.0-,.0- and.0-. The type RBA nterruptng ratngs shown are those of the dscharge flter type, n whch the nose s mnmzed and deonzaton of expulson gases s assured. Interruptng Amperes (Symmetrcal). 0,000 0,000..,000,00,00,000. 0,000,00..,000,00,00,000. 0,000,00..,000,00,00,000..,000,00,00..,000,00,00,000 These applcatons are subject to modfcaton when specfc factors such as transformer characterstcs, other protectve devces, coordnaton requrements and load varatons may ndcate a dfferent I F /I T rato. Cauton: Prmary fuses must not be reled upon for clearng secondary ground faults. CA000E For more nformaton vst:

8 .0- s Medum Voltage Techncal s June 0 Sheet 0 Techncal s (Contnued) Table.0-. Transformer Prmary Applcaton (Contnued) System Maxmum Transformer kva Voltage Type Self-Cooled Forced Ar,000 Lmtng,0 Lmtng,00 Lmtng Expulson 0 Expulson Expulson 0,000 Expulson 0 0,00 Expulson 00 Maxmum transformer kva ratngs are based on ratos of maxmum fuse current ratng to transformer full load current (I F /I T ) as lsted. For a C rse lqud-flled transformer, use the kva ratng for C rse ( C ratng x.). For suggested mnmum fuse applcatons, see Tables.0-,.0- and.0-. The type RBA nterruptng ratngs shown are those of the dscharge flter type, n whch the nose s mnmzed and deonzaton of expulson gases s assured. These applcatons are subject to modfcaton when specfc factors such as transformer characterstcs, other protectve devces, coordnaton requrements and load varatons may ndcate a dfferent I F /I T rato Cauton: Prmary fuses must not be reled upon for clearng secondary ground faults. Table.0-. Selecton of Mnmum Prmary for Transformer Protecton Instructons: Multply the transformer prmary full load current (FLA) tmes the multpler shown n the table to determne Suggested Mnmum Sze. Use fan-cooled Prmary FLA wth forced ar transformer multpler. See Tables.0- thru.0- for suggested mnmum fuse sze. Type CLE Lmtng s All s Type RBA, DBU Expulson Type s Famly/Characterstcs Type Range RBA-0 RBA-00 DBU- RBA-0 RBA-00 DBU- RBA-0 RBA-00 DBU- RBA-0 RBA-00 DBU- RBA-0 RBA-00 DBU- For Self-Cooled Transformers. x FLA of XFMR For Forced Ar Transformers. x FLA of XFMR Maxmum kv..,00,00,000..,00,00,000..,00,00.,000.,00,000.0,00.0,00,00.0,000 Interruptng Amperes (Symmetrcal) For more nformaton vst: CA000E

9 June 0 Sheet 0 s Medum Voltage Techncal s.0- Interruptng s of s Modern fuses are rated n amperes rms symmetrcal. They also have a lsted asymmetrcal rms ratng whch s. x the symmetrcal ratng. Refer to ANSI/IEEE C. for fuse nterruptng duty gudelnes. Calculaton of the fuse requred nterruptng ratng: Step Convert the fault from the utlty to percent or per unt on a convenent voltage and kva base. Step Collect the X and R data of all the other crcut elements and convert to a percent or per unt on a convenent kva and voltage base same as that used n Step. Use the substransent X and R for all generators and motors. Step Construct the sequence networks usng reactances and connect properly for the type of fault under consderaton and reduce to a sngle equvalent reactance. Step Same as above except usng resstances (omt f a symmetrcally rated fuse s to be selected). Step Calculate the E/X I value, where E s the prefault value of the voltage at the pont of fault normally assumed.0 n pu. For -phase faults E/X I s the fault current to be used n determnng the requred nterruptng capablty of the fuse. Note: It s not necessary to calculate a sngle phase-to-phase fault current. Ths current s very nearly / x -phase fault. The lne-to-ground fault may exceed the -phase fault for fuses located n generatng statons wth soldly grounded neutral generators, or n delta-wye transformers wth the wye soldly grounded, where the sum of the postve and negatve sequence mpedances on the hgh-voltage sde (delta) s smaller than the mpedance of the transformer. For sngle lne-to-ground fault; X I = X I (+) + X I (-) + X I (0) E I f = ---- X I Step Select a fuse whose publshed nterruptng ratng exceeds the calculated fault current. Table.0- should be used where older fuses asymmetrcally rated are nvolved. The voltage ratng of power fuses used on -phase systems should equal or exceed the maxmum lne-to-lne voltage ratng of the system. lmtng fuses for -phase systems should normally be appled so that the fuse voltage ratng s equal to or less than. x nomnal system voltage. However, the nsulaton levels on. kv systems normally allow. kv or. kv rated fuses to be used. Table.0-. Suggested Mnmum Lmtng s for Self-Cooled.. kv Transformer Applcatons E-Rated s System Nomnal kv s Maxmum kv Transformer kva Self-Cooled ,000,00,000,00,000,0,000,00, E 00E E 00E 00E 00E 00E E E 00E E E E 00E Note: ratngs represent the fuse that wll wthstand transformer nrush ( x FLC for 0. second and x FLC for.0 second) and be able to handle temporary overloads (% of FLC, % for. kv) E E E E 00E E E 00E E E 00E CA000E For more nformaton vst:

10 .0- s Medum Voltage Techncal s June 0 Sheet 0 Table.0-. Suggested Mnmum RBA Expulson s for Self-Cooled.. kv Transformer Applcatons E-Rated s System Nomnal kv s Maxmum kv Transformer kva Self-Cooled ,000,00,000,00,000,0,000,00, E 00E E 00E 00E E E 00E Two 00E-Ampere fuse refll unts n parallel wth % deratng. Two 00E-Ampere fuse refll unts n parallel wth % deratng. Two -Ampere fuse refll unts n parallel wth % deratng. Note: ratngs represent the fuse that wll wthstand transformer nrush ( x FLC for 0. second and x FLC for.0 second) and be able to handle temporary overloads (% of FLC, % for. kv). Table.0-. Suggested Mnmum RBA Expulson s for Self-Cooled. kv Transformer Applcatons System.... Nomnal kv s... Maxmum kv Transformer kva Self-Cooled 0,000,00,000,00,000,0,000,00, E 00E E E E 00E 00E E E Two -Ampere fuse refll unts n parallel wth % deratng. Note: ratngs represent the fuse that wll wthstand transformer nrush ( x FLC for 0. second and x FLC for.0 second) and be able to handle temporary overloads (% of FLC, % for. kv) E E 00E E E 00E E E E E 00E E E 00E E E For more nformaton vst: CA000E

11 June 0 Sheet 0 s Medum Voltage Techncal s.0- Table.0-. Suggested Mnmum DBU Expulson s for Self-Cooled.. kv Power Transformer Applcatons System Nomnal kv s Maxmum kv Transformer kva Self-Cooled -Phase Transformers ,000,00, E Note: ratngs represent the fuse that wll wthstand transformer nrush ( x FLC for 0. second and x FLC for.0 second) and be able to handle temporary overloads (% of FLC, % for. kv). Table.0-. Suggested Mnmum DBU Expulson s for Self-Cooled.. kv Power Transformer Applcatons System.... Nomnal kv s Maxmum kv Note: ratngs represent the fuse that wll wthstand transformer nrush ( x FLC for 0. second and x FLC for.0 second) and be able to handle temporary overloads (% of FLC, % for. kv). Table.0-. Type DBU Expulson s, Borc Acd, Indoor/Outdoor Note: Used on overhead dstrbuton transformers, substaton equpment, ndustral transformer nstallatons, and radal dstrbuton crcuts. Cutler-Hammer s a federally regstered trademark of Eaton Corporaton. UL s a federally regstered trademark of Underwrters Laboratores Inc. Westnghouse s a regstered trademark of Westnghouse Electrc Company LLC E E E E E E E E, Transformer kva Self-Cooled -Phase Transformers Maxmum Desgn kv 0 Amperes 0 E. K, K, K, K, K, K, K, K, 0K, 0K, 0K, K, 0K, 0K, 0K, 0K, E, E,, E, E,, E,,,,,,,,, E,, SE, SE, SE, 0SE, 0SE, 0SE, SE, 0SE, 0SE, SE, SE, SE, 0SE K, K, K, K, K, K, K, K, 0K, 0K, 0K, K, 0K, 0K, 0K, 0K, E, E,, E, E,, E,,,,,,,,, E,, SE, SE, SE, 0SE, 0SE, 0SE, SE, 0SE, 0SE, SE, SE, SE, 0SE K, K, K, K, K, K, K, K, 0K, 0K, 0K, K, 0K, 0K, 0K, 0K, E, E,, E, E,, E,,,,,,,,, E,, SE, SE, SE, 0SE, 0SE, 0SE, SE, 0SE, 0SE, SE, SE, SE, 0SE E E Interruptng rms (ka Symmetrcal). E E For addtonal nformaton see: CA00E Secton CA000E For more nformaton vst:

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