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CA08104001E For more information, visit: www.eaton.com/consultants

September 2011

Contents

Fuses—Medium Voltage9

Sheet 09001

F u s e s —

M e d i u m V

o l t a g

e

Fuses—Medium Voltage

General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9.0-2

Current Limiting Fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9.0-4

Expulsion Fuses. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9.0-6

Technical Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9.0-7

Specifications

See Eaton’s Product Specification Guide

, available on CD or on the Web.

CSI Format: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1995 2010

Section 16362 Section 26 18 16

Current Limiting Fuses

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General Description

Medium Voltage Fuses

Eaton’s entry in the power fusebusiness began over 75 years agounder Westinghouse

®

Electric. In 1935,Westinghouse introduced the mediumvoltage boric acid expulsion fusefollowed by the medium voltagecurrent limiting fuse. Even today,medium voltage fuses continue to usethe core Westinghouse technology.Eaton continues to build on theWestinghouse technology legacy byengineering higher performance,cost-effective power fuse products.

Eaton medium voltage fuses aremanufactured and tested to therequirements of the ANSI C37.4Xseries of standards.

Eaton is the only North Americanmanufacturer of both current limitingand expulsion medium voltage powerfuses. A full range of general purpose,backup and boric acid fuses isavailable for distribution and powerapplications.

All Eaton medium voltage fuses arethoroughly tested and conform toANSI specifications. Some motorstarter fuses are UR

®

recognized, andboth current limiting and expulsionfuses have been approved in UL

®

rated switchgear.

Current limiting and expulsion fuses

can be used to meet any overcurrentprotection need. At any point alongthe medium voltage electricaldistribution system, Eaton has afuse to satisfy your overcurrentprotection needs.

The following fuse terminology willassist in understanding and selectingthe correct fuse. The following is abrief overview of those terms.

Power vs. Distribution

The differentiation is intended toindicate the test conditions and wherefuses are normally applied in a powersystem, based on specific requirementsfor generating sources, substationsand distribution lines. Each class hasits own unique set of voltage, currentand construction requirements(see ANSI C37.42, .46 and .47).

Low vs. Medium vs. High Voltage

While fuses are defined in the ANSIstandards as either low or high voltage,Eaton’s Electrical Sector has elected toname their fuses to correspond withthe equipment in which they are

installed. Therefore, per ANSI C84,fuses are named as follows:

Low Voltage

1000V and below

Medium Voltage

Greater than1000–69,000V

High Voltage

Greater than69,000V

Expulsion vs. Current Limiting

Expulsion Fuse

: An expulsion fuse isa vented fuse in which the expulsioneffect of the gases produced by inter-nal arcing, either alone or aided byother mechanisms, results in current

interruption.

An expulsion fuse is not currentlimiting and as a result limits the dura-tion of a fault on the electrical system,not the magnitude.

Current Limiting Fuse:

A current limit-ing fuse is a fuse that, when its currentresponsive element is melted by a cur-rent within the fuse’s specified currentlimiting range, abruptly introducesa high resistance to reduce currentmagnitude and duration, resulting insubsequent current interruption.

Table 9.0-1. General Fuse Comparison

Expulsion CurrentLimiting

Vented

Electromechanical

Interrupts at current zero,limits faultcurrent duration

Generally higher voltageratings

Different time/currentcharacteristics

Sealed

Static

Limits fault currentmagnitude andduration

Generally higherinterrupting ratings

Different time/ currentcharacteristics

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Table 9.0-2. Eaton Medium Voltage Fuse Family

Table 9.0-3. Application Guide

Table 9.0-4. Power Fuse Ampere Characteristic Ratings

Current Limiting Expulsion

HLE: Helical configuration current limiting, E-ratedCLE: Current limiting, E-ratedCLS: Current limiting starter (motor starter)HCL: Current limiting, clip-mount, E-rated

CX: Current limiting, C-ratedCLPT: Current limiting, E-rated

RBA: Refillable, boric acidRDB: Refillable, dropout, boric acidDBU: Dropout, boric acid, indoor/outdoor S&C equivalent

Type FuseVoltageRange (kV)

FuseAmpereRating

Fuse MaximumInterruptingRating (kA Sym.)

Class UseIndoor/Outdoor

Applied in:

Current Limiting

CLE 2.4–15.5 10E–1350A 65 General purposeindoor/outdoor

Fused switches, feeder circuit sectionalizing, power transformers,dip poles, substation capacitor banks.

CLPT 2.4–38 0.25E–10E 80 General purposeindoor

Potential transformers. BAL-1 mountings and clipsare no longer available.

CLS 2.4–8.3 2R–44R 50 Backup distributionindoor

AMPGARD

®

and non-AMPGARD motor starters. HCLS version is thesame as the CLS except hermetically sealed for hazardous locations.

CX/CXICXN

4.3–15.5 3.5C–300C 50 General purposedistribution indoor

Pad mounted distribution transformers, Substation service transformers,and fused switches. Direct substitution for McGraw’s NX fuse.

HCL 2.4–15.5 10A–900A 63 General purposedistribution indoor Fused switches, feeder circuit sectionalizing, power transformers,dip poles, substation capacitor banks.

HLE 2.4–15.5 10E–450E 65 General purposeindoor/outdoor

Fused switches, feeder circuit sectionalizing, power transformers,dip poles, substation capacitor banks.

Expulsion Fuses

RBA 2.4–38 0.5E–720E 37.5 Boric acid powerindoor

Fused switches, feeder circuit sectionalizing, and power transformers.

RDB 2.4–38 0.5E–720E 37.5 Boric acid poweroutdoor

Feeder circuit sectionalizing, power transformers, substationservice transformers, dip poles, potential transformers,and substation capacitor banks. Outdoor version of the RBA.

DBU 4.4–38 5E–200E,3K–200K

50 Boric acid powerindoor/outdoor

Feeder circuit sectionalizing, fused switches, power transformers,substation service transformers, dip poles, and potential transformers.Direct equivalent for S&C’s SMU-20 fuse units.

Rating Definition

E Fuses rated 100E or below will melt in 300 seconds at some current value between 2.0 and 2.4 times the E number.

Fuses rated above 100E will melt in 600 seconds at some current value between 2.2 and 2.64 times the E number.

R The fuse will melt in 15 to 35 seconds when the current equals 100 times the R number.

C The fuse will melt in 1000 seconds at some current value between 1.7 and 2.4 times the C number.

A Class A fuses have parameters that do not fall within the ‘C’, ‘E’, or ‘R’ definitions above.

X Meet C37.40 temperature requirements, but not the E rating.

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Current Limiting Fuse Types

There are three current limiting fusetypes: backup, general purpose andfull range. It is important that the userhave an understanding of these defini-tions to ensure proper application ofthe fuse (

Figure 9.0-1).

Backup Fuse:

A fuse capable of inter-rupting all currents from the ratedmaximum interrupting current downto the rated minimum interruptingcurrent.

Backup fuses are normally used forprotection of motor starters and arealways used in series with anotherinterrupting device capable of inter-rupting currents below the fuse’s ratedminimum interrupting current.

General Purpose Fuse:

A fuse capableof interrupting all currents from therated maximum interrupting currentdown to the current that causesmelting of the fusible element in noless than one hour.

General purpose fuses are typicallyused to protect feeders andcomponents such as transformers.

Full Range Fuse

: A fuse capable ofinterrupting all currents from the ratedmaximum interrupting rating down tothe minimum continuous current thatcauses melting of the fusible element,with the fuse applied at the maximumambient temperature specified by themanufacturer.

Current limiting fuses are constructedwith pure silver fuse elements, highpurity silica sand filler, and a glassresin outer casing.

A high fault current melts the silverelement almost instantly and loses

energy to the surrounding sand. Thesand melts and forms fulgurite, aglass-like substance. The arc voltagerapidly increases to nearly three timesthe fuse voltage rating and forces thecurrent to zero.

Low fault current melts a solder dropon the silver fuse element that, in turn,melts the silver. The element burnsback until there is a sufficient internalgap to interrupt the current. This isknown as the M-effect.

Eaton offers current limiting fuses intwo basic types: backup and generalpurpose. Backup fuses are applied in

series with another circuit protectivedevice, such as a contactor or anexpulsion fuse, to interrupt high faultcurrents beyond the other device’srange. General purpose fuses aredesigned to interrupt low faultcurrents that cause them to meltin one hour or less.

Figure 9.0-1. Current Limiting Types Protection Range

Interrupting Current

C u r r e n t L i m

i t i n g T y p e

max.interrupting current

min.interrupting current

rated maximum

rated minimum

hr. – current causing elementmelting in 1 hour

–

–

–

any current meltingelement with no timelimit Backup

General Purpose

hr.

min.

max.

Full Range

Multi-Range Fuses

CLE and HLE fuses are also available inuser-selectable multi-range versions10–40A, 50–125A and 150–200A.

Disconnect End Fittings and Disconnect Live Parts

Accessories

A wide assortment of mountings, liveparts and end fittings are available tofacilitate power fuse installation.

Mountings

Mountings include a base, porcelainor glass polyester insulators, andlive parts. They help enable the fuseto be safely attached to the gear.Mountings can be either disconnector non-disconnect.

Live Parts

Live parts attach the fuse to theinsulators and are considered partof the mounting. All parts above theinsulators are live parts.

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Table 9.0-5. CLE, HLE, HCL and CLS Fuses

Table 9.0-6. CLPT, CX, CLT and DSL Fuses

Description Family

CLE HLE HCL CLS

General

Class General purpose General purpose General purpose Backup

Use Power Power Power Power

Maximum kV 2.75–15.5 5.5–15.5 5.5–15.5 2.4–15.5

Maximum kA 63 63 63 50

Rating 10E–1350A 10E–450A 10E–900E 2R–44R

Mounting Clip Clip, bolt-on, hookeye Clip lock, bolt-on Clip, bolt-on, hookeye

Indicator Standard Standard Standard Standard

Approvals IEEE, ANSI IEEE, ANSI IEEE, ANSI UL

®

, IEEE, ANSI

Applications

Feeder circuits

■ ■ ■

Motor starters

■

PTs and CTs

LV breakers

Substation service

Transformers ■ ■ ■

Capacitor banks ■ ■ ■

Fused switches ■ ■ ■

Description Family

CLPT CX CLT DSL

General

Class General General General Back-up

Use Power/distribution Distribution Distribution Power

Maximum kV 5.5–38 4.3–15.5 2.75–15 600V

Maximum kA 80 50 25 200

Rating 0.25E –10E 3.5C–300C 5–150 100–5000

Mounting Clip Clip Stud bolt-on Bolt-on

Indicator Optional None None None

Approvals IEEE, ANSI IEEE, ANSI IEEE, ANSI UL

Applications

Feeder circuits

Motor starters

PTs and CTs

■

LV breakers

■

Substation service

■

Transformers

■ ■

Capacitor banks

Fused switches

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Expulsion Fuses

RBAE-Rated Refillable Boric Acid

RDB E-Rated Refillable Outdoor Dropout Boric Acid

DBU Dropout Boric Acid—for Use Indoors,Inside Switchgear or Outdoors

Eaton’s expulsion fuses use boric acidas the interrupting medium. Under afault condition, arc heat decomposesthe boric acid into water vapor. Thewater vapor blast deionizes the arcpath preventing arc re-ignition aftera natural current zero.

Type RBA indoor expulsion fusesmust be fitted with a discharge filteror condenser that moderates thedischarge exhaust. The dischargefilter limits the exhaust to a smalland relatively inert amount of gasand lowers the noise level withoutaffecting the fuse interrupting rating.Steam discharge, that can effect theinterrupting, is fully restricted bythe condenser.

Type RDB outdoor dropout fusesinclude an ejector spring that forcesthe arcing rod through the top of the

fuse. The arcing rod strikes a latch onthe mounting that forces the fuse toswing outward through a 180° arc intothe dropout position.

Refill units can be field installed intoRBA and RDB expulsion fuses. Oncethe operated unit has been removed,the separately purchased unit can beeasily installed into the fuse holder.

Type DBU fuse units are designedfor new and aftermarket utilityapplications. End fittings are available,in both indoor and outdoor versions,as well as live parts and mountings.Mufflers confine the arc within the

fuse and substantially reduce the noiseand exhaust when the fuse interrupts.

Accessories

The following accessories are availablefor expulsion fuses:

Mountings

Mountings include a base, porcelain

or glass polyester insulators, and liveparts. They help enable the fuse to besafely attached to the gear. Mountingscan be either disconnect, non-disconnector dropout. Non-disconnect mountingsare available in either bolt-on or clamp-type arrangements. Fuses may bevertical or underhung.

Live Parts

Live parts attach the fuse to theinsulators and are considered partof the mounting. All parts above theinsulators are live parts.

End Fittings

End fittings are metal parts thatattach to each end of the fuse atthe ferrules. They are used only ondisconnect fuses or when convertinga non-disconnect to a disconnect fuse.

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Technical Ratings

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Technical Ratings

Table 9.0-7. Transformer Primary Fuse Application

Maximum transformer kVA ratings are based on ratios of maximum fuse current rating to transformer full load current (IF /IT) as listed.For a 55°C rise liquid-filled transformer, use the kVA rating for 65°C rise (55°C rating x 1.12). For suggested minimum fuse applications,see Tables 9.0-9

, 9.0-10

and 9.0-11

.

The type RBA interrupting ratings shown are those of the discharge filter type, in which the noise is minimized and deionization ofexpulsion gases is assured.

These applications are subject tomodification when specific factorssuch as transformer characteristics,other protective devices, coordinationrequirements and load variations mayindicate a different I

F

/I

T

ratio.

Caution:

Primary fuses must not berelied upon for clearing secondaryground faults.

SystemVoltage

FuseType

Maximum Transformer kVA

Fuse Family/Characteristics

Self-Cooled ForcedAir

Type CurrentRange

MaximumkV

InterruptingRating Amperes(Symmetrical)

2400 Currentlimiting

742133622284010742890

866156026004676866

1039

CLECLECLE-750CLE-750CXNCXN

10–250300–450600–750

1000–135060–250

300

5.5 63,00063,00040,00031,50050,00050,000

8.3

Expulsion 60011902140

69513852500

RBA-200RBA-400RBA-800DBU-17

10–2005–400

450–7203–200

8.3 19,00037,50037,50014,00017.1


128723173862695212861545

150227034506811115011802

CLE/HLECLE/HLECLE-750CLE-750CXNCXN

10–250300–450600–750

1000–135060–250

300

5.5 63,00063,00040,00031,50050,00050,000

8.3


120024004320


10–2005–400

450–7203–200

8.3 19,00037,50037,50014,00017.1


148326714451801314831780

173131165193934817312077

CLE/HLECLE/HLECLE-750CLE-750CXNCXN

10–250300–450600–750

1000–135060–250

300

5.5 63,00063,00040,00031,50050,00050,000

8.3


138527755000


10–2005–400

480–7203–200

8.3 19,00037,50037,50014,000


1536298721342560

1792348524902987

CLE/HLECLECXNCXN

10–175200–35060–250

300

8.3 50,00050,00050,00050,000


200039857170


10–2005–400

450–7203–200

8.3 19,00037,50037,50014,000


222890

1603311722262672

25910391870363725983117

CLE/HLECLE/HLECLE/HLECLECXNCXN

10–2530–100

125–180200–35060–250

300

8.3 50,00050,00050,00050,00050,00050,000


208041607500


10–2005–400

450–7203–200

8. 19,00037,50037,50014,00017.1

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Technical Ratings

008

Technical Ratings (Continued)

Table 9.0-7. Transformer Primary Fuse Application (Continued)

Maximum transformer kVA ratings are based on ratios of maximum fuse current rating to transformer full load current (IF /IT) as listed.For a 55°C rise liquid-filled transformer, use the kVA rating for 65°C rise (55°C rating x 1.12). For suggested minimum fuse applications,see Tables 9.0-9

, 9.0-10

and 9.0-11

.

The type RBA interrupting ratings shown are those of the discharge filter type, in which the noise is minimized and deionization ofexpulsion gases is ensured.

These applications are subject tomodification when specific factorssuch as transformer characteristics,other protective devices, coordinationrequirements and load variations mayindicate a different I

F

/I

T

ratio.

Caution:

Primary fuses must not berelied upon for clearing secondaryground faults.

Table 9.0-8. Selection of Minimum Primary Fuse for Transformer Protection

SystemVoltage

FuseType

Maximum Transformer kVA

Fuse Family/Characteristics

Self-Cooled ForcedAir

Type CurrentRange

MaximumkV

InterruptingRating Amperes(Symmetrical)

12,000 Currentlimiting

37114842226445214842597

43217312597519517313030

CLEHLECLEHLECXNCXN

10–15010–125

175–300150–25045–100

120–175

15.5 63,00063,00063,00063,00050,00050,000

Expulsion 29705945

34656930


10–2005–400

450–72010–200

15.5 14,40029,40029,40014,000


40816322449489816322857

47619052857571519053333

CLEHLECLEHLECXNCXN

10–15010–125

175–300150–25045–100

120–175

15.5 63,00063,00063,00063,00050,00050,000

Expulsion 3265

6530

3810

7620

RBA-200

RBA-400RBA-800DBU-17

10–200

5–400450–720

7–150

15.5 14,400

29,40029,40014,000


42617072560512117075855

49719912987597519913485

CLEHLECLEHLECXNCXN

10–15010–125

175–300150–25045–100

120–175

15.5 63,00063,00063,00063,00050,00050,000


398579703985


10–2005–400

450–7207–150

15.5

17.1

14,40029,40029,40014,000

23,000 Expulsion 569085355690

663599506635


10–2005–300

450–5403–200

25.5

27.0

10,50021,00021,00012,500

34,500 Expulsion 8535128008535

9950149259950


10–2005–300

450–5403–200

38.0 6,90016,80016,80010,000

Instructions:

Multiply the transformer primary full load current(FLA) times the multiplier shown in the table to determinesuggested minimum size fuse. Use fan-cooled primary FLAwith forced air transformer multiplier. See Tables 9.0-9

thru 9.0-11for suggested minimum fuse size.

For self-cooledtransformers

For forced airtransformers

Type CLE current limiting fusesType RBA, DBU expulsion type fuses

All ratings 1.4 x FLAof XFMR

1.2 x FLAof XFMR

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Technical Ratings009

Interrupting Ratings of FusesModern fuses are rated in amperesrms symmetrical. They also have alisted asymmetrical rms rating, whichis 1.6 x the symmetrical rating.

Refer to ANSI/IEEE C37.48 for fuseinterrupting duty guidelines.

Calculation of the fuse requiredinterrupting rating:Step 1—Convert the fault fromthe utility to percent or per unit ona convenient voltage and kVA base.

Step 2—Collect the X and R data of allthe other circuit elements and convertto percent or per unit on a convenientkVA and voltage base same as thatused in Step 1. Use the substransientX and R for all generators and motors.

Step 3—Construct the sequencenetworks using reactances andconnect properly for the type of faultunder consideration and reduce to asingle equivalent reactance.

Step 4—Same as above except using

resistances (omit if a symmetricallyrated fuse is to be selected).

Step 5—Calculate the E/XI value,where E is the prefault value of thevoltage at the point of fault normallyassumed 1.0 in pu. For three-phasefaults E/XI is the fault current to beused in determining the requiredinterrupting capability of the fuse.

Note: It is not necessary to calculatea single phase-to-phase fault current. Thiscurrent is very nearly /2 x three-phasefault. The line-to-ground fault may exceedthe three-phase fault for fuses located ingenerating stations with solidly grounded

neutral generators, or in delta-wye trans-formers with the wye solidly grounded,where the sum of the positive and negativesequence impedances on the high voltageside (delta) is smaller than the impedance ofthe transformer.

For single line-to-ground fault;

XI = XI(+) + XI(-) + XI(0)

Step 6—Select a fuse with a publishedinterrupting rating exceeding thecalculated fault current.

Table 9.0-10 should be used whereolder asymmetrically rated fusesare involved.

The voltage rating of power fusesused on three-phase systems shouldequal or exceed the maximum line-to-line voltage rating of the system.Current limiting fuses for three-phasesystems should normally be appliedso that the fuse voltage rating is equalto or less than 1.41 x nominal systemvoltage. However, the insulation

levels on 2.4 kV systems normallyallow 4.3 or 5.5 kV rated fuses tobe used.

Table 9.0-9. Suggested Minimum Current Limiting Fuse Current Ratings for Self-Cooled 2.4–15.5 kV Transformer Applications—E-Rated Fuses

Note: Fuse ratings represent the fuse that will withstand transformer inrush (12 x FLC for 0.1 second and 25 x FLC for 0.01 second) and be ableto handle temporary overloads (133% of FLC, 150% for 15.5 kV).

3

IfE

XI

----- 3×=

SystemNominal kV

2.4 4.16 4.8 7.2 12.0 13.2 13.8 14.4

Fuses Maxi-mum kV

2.75 5.5 5.5 8.3 15.5 15.5 15.5 15.5

TransformerkVA RatingSelf-Cooled

FullLoadCurrentAmps

FuseRatingAmps E

FullLoadCurrentAmps

FuseRatingAmps E

FullLoadCurrentAmps

FuseRatingAmps E

FullLoadCurrentAmps

FuseRatingAmps E

FullLoadCurrentAmps

FuseRatingAmps E

FullLoadCurrentAmps

FuseRatingAmps E

FullLoadCurrentAmps

FuseRatingAmps E

FullLoadCurrentAmps

FuseRatingAmps E

112.5

150225

27.1

36.154.1

50E

65E80E

15.6

20.831.2

25E

30E50E

13.5

18.027.1

20E

25E50E

9.0

12.018.0

15E

20E25E

5.4

7.210.8

10E

15E15E

4.9

6.69.8

10E

10E15E

4.7

6.39.4

10E

10E15E

4.5

6.09.0

10E

10E15E

300500750

72.2120.3180.4

125E200E300E

41.669.4

104.1

80E125E150E

36.160.190.2

65E100E150E

24.140.160.1

40E65E

100E

14.424.136.1

20E50E65E

13.121.932.8

20E30E65E

12.620.931.4

20E30E65E

12.020.030.1

20E30E65E

100015002000

240.6360.8481.1

350E600E750E

138.8208.2277.6

200E300E400E

120.3180.4240.6

175E250E350E

80.2120.3160.4

125E175E250E

48.172.296.2

80E100E150E

43.765.687.5

80E100E125E

41.862.883.7

80E100E150E

40.160.180.2

80E100E125E

250030003750

601.4721.7902.1

1100E1100E1350E

347.0416.4520.4

600E600E750E

300.7360.8451.1

450E600E750E

200.5240.6300.7

300E350E—

120.3144.3180.4

200E250E250E

109.3131.2164.0

175E200E250E

104.6125.5156.9

175E200E250E

100.2120.3150.4

175E200E250E

50007500

10,000

1202.81804.22405.6

———

693.91040.91387.9

1100E——

601.4902.1

1202.8

1100E1350E—

400.9601.4801.9

———

240.6360.8481.1

———

218.7328.0437.4

300E——

209.2313.8418.4

300E——

200.5300.7400.9

300E——

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Table 9.0-10. Suggested Minimum RBA Expulsion Fuse Ratings for Self-Cooled 2.4–15.5 kV Transformer Applications—E-Rated Fuses

Two 300E-ampere fuse refill units in parallel with 10% derating. Two 400E-ampere fuse refill units in parallel with 10% derating. Two 250E-ampere fuse refill units in parallel with 10% derating.


Table 9.0-11. Suggested Minimum RBA Expulsion Fuse Ratings for Self-Cooled 25.8–38 kV Transformer Applications

Two 250E-ampere fuse refill units in parallel with 10% derating.


SystemNominal kV

2.4 4.16 4.8 7.2 12.0 13.2 13.8 14.4

Fuses Maxi-mum kV

2.75 5.5 5.5 8.3 15.5 15.5 15.5 15.5

Transformer

kVA RatingSelf-Cooled

Full

LoadCurrentAmps

Fuse

RatingAmps E

Full

LoadCurrentAmps

Fuse

RatingAmps E

Full

LoadCurrentAmps

Fuse

RatingAmps E

Full

LoadCurrentAmps

Fuse

RatingAmps E

Full

LoadCurrentAmps

Fuse

RatingAmps E

Full

LoadCurrentAmps

Fuse

RatingAmps E

Full

LoadCurrentAmps

Fuse

RatingAmps E

Full

LoadCurrentAmps

Fuse

RatingAmps E

112.5150225

27.136.154.1

40E50E80E

15.620.831.2

25E30E50E

13.518.027.1

20E25E40E

9.012.018.0

15E20E25E

5.47.2

10.8

10E10E15E

4.96.69.8

10E10E15E

4.76.39.4

10E10E15E

4.56.09.0

10E10E15E

300500750

72.2120.3180.4

100E175E250E

41.669.4

104.1

65E100E150E

36.160.190.2

50E80E

125E

24.140.160.1

40E65E80E

14.424.136.1

20E40E50E

13.121.932.8

20E30E50E

12.620.931.4

20E30E50E

12.020.030.1

20E30E50E

100015002000

240.6360.8481.1

400E450E

720E

138.8208.2277.6

200E300E400E

120.3180.4240.6

175E250E350E

80.2120.3160.4

125E175E250E

48.172.296.2

65E100E150E

43.765.687.5

65E100E125E

41.862.883.7

65E100E125E

40.160.180.2

65E80E

125E

250030003750

601.4721.7902.1

———

347.0416.4520.4

540E

720E

720E

300.7360.8451.1

400E540E

720E

200.5240.6300.7

300E350E400E

120.3144.3180.4

175E200E250E

109.3131.2164.0

150E175E250E

104.6125.5156.9

150E175E250E

100.2120.3150.4

150E175E200E

50007500

10,000

1202.81804.2

2405.6

——

—

693.91040.9

1387.9

——

—

601.4902.1

1202.8

——

—

400.9601.4

801.9

540E

—

—

240.6360.8

481.1

400E540E

720E

218.7328.0

437.4

300E450E

720E

209.2313.8

418.4

300E450E

720E

200.5300.7

400.9

300E450E

540E

SystemNominal kV

22.9 23.9 24.9 34.5

FusesMaximum kV

25.8 25.8 24.8 —

Transformer kVARating Self-Cooled

Full LoadCurrent Amps

Fuse RatingAmps E


Fuse RatingAmps E


Fuse RatingAmps E


Fuse RatingAmps E

7501000

1500

18.925.2

37.8

30E40E

65E

18.124.2

36.2

25E40E

50E

17.423.2

34.8

25E40E

50E

12.616.7

25.1

20E25E

40E

200025003000

50.463.075.6

80E100E125E

48.360.472.5

65E100E100E

46.458.069.6

65E80E

100E

33.541.850.2

50E65E80E

375050007500

10,000

94.5126.1189.1252.1

150E175E300E450E

90.6120.8181.2241.6

125E175E250E450E

87.0115.9173.9231.9

125E175E250E450E

62.883.7

125.5167.3

100E125E175E250E

8/3/2019 Power Fuse



9.0September 2011


Sheet 09


Table 9.0-12. Suggested Minimum DBU Expulsion Fuse Current Ratings for Self-Cooled 2.4–15.5 kV Power Transformer Applications


Table 9.0-13. Suggested Minimum DBU Expulsion Fuse Current Ratings for Self-Cooled 2.4–15.5 kV Power Transformer Applications


Table 9.0-14. Type DBU Expulsion Fuses, Boric Acid, Indoor/Outdoor

Note: Used on overhead distribution transformers, substation equipment, industrial transformer installations, and radial distribution circuits.

SystemNominal kV

2.4 4.2 4.8 7.2 12.0 13.2 13.8 14.4

Fuses Maxi-mum kV

17.1 17.1 17.1 17.1 17.1 17.1 17.1 17.1

Transformer

kVA RatingSelf-Cooled

Full

LoadCurrentAmps

Fuse

RatingAmps E

Full

LoadCurrentAmps

Fuse

RatingAmps E

Full

LoadCurrentAmps

Fuse

RatingAmps E

Full

LoadCurrentAmps

Fuse

RatingAmps E

Full

LoadCurrentAmps

Fuse

RatingAmps E

Full

LoadCurrentAmps

Fuse

RatingAmps E

Full

LoadCurrentAmps

Fuse

RatingAmps E

Full

LoadCurrentAmps

Fuse

RatingAmps E

Three-Phase Transformers

112.5150225

273654

40E50E80E

162131

25E30E50E

141827

20E25E40E

91218

15E20E25E

57

11

10E10E15E

57

10

7E10E15E

569

7E10E15E

569

7E10E15E

300500750

72120180

100E200E—

4269

104

65E100E150E

366090

50E100E125E

244060

40E65E

100E

142436

20E40E50E

132233

20E30E50E

132131

20E30E50E

122030

20E30E50E

100015002000

241361481

———

139208278

200E——

120180241

200E——

80120160

125E200E—

487296

80E100E150E

446687

65E100E125E

426384

65E100E125E

406080

65E65E

125E

2500 601 — 347 — 301 — 200 — 120 200E 109 150E 105 150E 100 150E

SystemNominal kV

22.9 23.9 24.9 34.5

Fuses Maxi-mum kV

27.0 27.0 27.0 38.0

TransformerkVA RatingSelf-Cooled


Fuse RatingAmps E


Fuse RatingAmps E


Fuse RatingAmps E


Fuse RatingAmps E

Three-Phase Transformers

75010001500

192538

30E40E65E

182436

25E40E50E

172334

25E40E50E

131725

20E25E40E

200025003750

506395

80E100E150E

486091

80E100E150E

465887

65E80E

125E

334263

50E65E

100E

MaximumDesign kV

Current RatingAmperes

Interrupting Ratingrms (kA Symmetrical)

17.1 3K, 6K, 8K, 10K, 12K, 15K, 20K, 25K, 30K, 40K, 50K, 65K, 80K, 100K, 140K, 200K,5E, 7E, 10E, 13E, 15E, 20E, 25E, 30E, 40E, 50E, 65E, 80E, 100E, 125E, 150E, 175E, 200E,15SE, 20SE, 25SE, 30SE, 40SE, 50SE, 65SE, 80SE, 100SE, 125SE, 150SE, 175SE, 200SE

14

27 3K, 6K, 8K, 10K, 12K, 15K, 20K, 25K, 30K, 40K, 50K, 65K, 80K, 100K, 140K, 200K,5E, 7E, 10E, 13E, 15E, 20E, 25E, 30E, 40E, 50E, 65E, 80E, 100E, 125E, 150E, 175E, 200E,15SE, 20SE, 25SE, 30SE, 40SE, 50SE, 65SE, 80SE, 100SE, 125SE, 150SE, 175SE, 200SE

12.5

38 3K, 6K, 8K, 10K, 12K, 15K, 20K, 25K, 30K, 40K, 50K, 65K, 80K, 100K, 140K, 200K,5E, 7E, 10E, 13E, 15E, 20E, 25E, 30E, 40E, 50E, 65E, 80E, 100E, 125E, 150E, 175E, 200E,15SE, 20SE, 25SE, 30SE, 40SE, 50SE, 65SE, 80SE, 100SE, 125SE, 150SE, 175SE, 200SE

10–outdoor8.5–indoor with muffler

For additional information, see:

Volume 4, CA08100005E. . . . . . . . . . . . . . . . . Tab 26

8/3/2019 Power Fuse


.0-12

For more information, visit: www.eaton.com/consultants CA08104001E

September 2011


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