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SECTION IB-1G-500
INSTALLATION & OPERATION INSTRUCTIONS
PAD-MOUNTED SWITCHGEAR TYPE PSI
REV. 1.6 - NOVEMBER 2017
PAGE 10
Fuse Ratings
Fuse
Manufacturer
and Type ††
At 14.4kV Nominal Voltage • 95 kV BIL
S&C SM-4
S&C SMU-20
S&C SM-5
Eaton DBU
Cooper NX
Cooper Q
At 25kV Nominal Voltage • 125 kV BIL
S&C SM-4
S&C SMU-20
S&C SM-5
Eaton DBU
Cooper NX
Cooper Q
*In conjunction with Auto-jet
Fuse Mountings.
®
† Three time fault-close rating: The Auto-jet
three times when closed briskly without hesitation and remain operable and able to carry and interrupt the rated continuous current. (The fuse must be replaced
after each interruption. Refer to S&C instruction manual for SML-4Z holder and SML-20 end fitting maintenance required after each fault close or fault interruption).
14.4kV Nominal
SM-4 fused units require three S&C Cat. No. 92352 SML-4Z fuse-
holders and three S&C SM-4 fuse refills per fuse compartment. ††
SMU-20 fused units require three S&C Cat. No. 3097 SML-20 fuse
end fittings and three S&C SMU-20 fuse units per fuse compart-
ment. ††
SM-5 fused units require three S&C Cat. No. 86642R2 SM-5S fuse-
holders and three S&C SM-5 fuse refills per fuse compartment. ††
DBU fused units require three FP Cat. No. EFA-42 DBU end fittings
and three Eaton DBU fuse units per fuse compartment. ††
NX fused units: Auto-jet
®
100 ampere Cooper Type NX current limiting fuse rated 8.3kV, one
100 ampere fuse rated 13.5kV, or one 80 ampere fuse rated 15kV.
Three sets of Auto-jet
end fittings and three appropriately rated
®
fuses are required in each fuse compartment. ††
Q fused units: Auto-jet
fuse mountings will accommodate one 100
®
ampere Cooper Type Q current limiting fuse rated 8.3kV or 15kV.
Three sets of Auto-jet
end fittings and three appropriately rated
®
fuses are required in each fuse compartment.
†† For fuse application and ordering information refer to the current issue of:
•
S&C Bulletin 252-31
•
Cooper (McGraw-Edison) Cat. Sect. 240-60
•
Eaton Cat. Sect. 4.4
•
Eaton Cat. Sect. AD36-643
•
Eaton Cat. Sect. PL36-609
601 Old Airport Road • Bristol, VA 24201 Phone (276) 669-4084 • FAX (276) 669-1869 • www.federalpacific.com • ISO9001:2015
Max. Cont.
Load-break*
200
200
200
200
400
NLB
200
200
200
200
200
200
300
NLB
200
200
fuse mounting can withstand a fuseholder or fuse with end fitting being closed into a fault of the magnitude specified
®
fuse mountings will accommodate one
Amperes RMS
Interrupting SYM
12,500
14,000
25,000
14,000
50,000
12,500
12,500
12,500
20,000
12,500
50,000
25,000
25kV Nominal
SM-4 fused units require three S&C Cat. No. 92353 SML-4Z fuse-
holders and three S&C SM-4 fuse refills per fuse compartment. ††
SMU-20 fused units require three S&C Cat. No. 3097 SML-20 fuse
end fittings and three S&C SMU-20 fuse units per fuse compart-
ment. ††
SM-5 fused units require three S&C Cat. No. 86643R2 SM-5S fuse-
holders and three S&C SM-5 fuse refills per fuse compartment. ††
DBU fused units require three FP Cat. No. EFA-42 DBU end fittings
and three Eaton DBU fuse units per fuse compartment. ††
NX fused units: Auto-jet
100 ampere Cooper Type NX current limiting fuse rated 13.5kV,
one 80 ampere fuse rated 15kV, or one 40 ampere fuse rated 23kV,
or one 50 ampere fuse rated 27kV. Three sets of Auto-jet
fittings and three appropriately rated fuses are required in each
fuse compartment. ††
Q fused units: Auto-jet
ampere Cooper Type Q current limiting fuse rated 15.5 kV, one 100
ampere fuse rated 23kV, or one 80 ampere fuse rated 27kV. Three
sets of Auto-jet
are required in each fuse compartment. ††
Ratings expressed in RMS amperes asymmetrical are 1.6 times
the symmetrical values listed.
Unit overall ratings are limited to the lowest component rating.
Load-break rating same as maximum continuous current rating.
Momentary &
3-Time Fault-Close†
ASYM
20,000
22,400
N/A
22,400
40,000
40,000
20,000
20,000
N/A
20,000
40,000
40,000
fuse mountings will accommodate one
®
fuse mountings will accommodate one 100
®
end fittings and three appropriately rated fuses
®
3-Phase
MVA SYM
310
350
620
350
620
620
540
540
865
540
1,080
1,080
end
®
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