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SECTION IB-2A-210
INSTALLATION & OPERATION INSTRUCTIONS
TYPE PSE PAD-MOUNTED SWITCHGEAR
NOVEMBER 2017, REV 4.2
PAGE 13
14.4kV Nominal
SM-4 fused units require three S&C Cat. No. 86632R2 SM-4Z
fuseholders and three S&C SM-4 fuse refills per fuse compart-
ment. ††
SMU-20 fused units require three S&C Cat. No. 3097 SM-20
fuse end fittings and three S&C SMU-20 fuse units per fuse
compartment. ††
DBU fused units require three FP Cat. No. EFA-42 DBU end fit-
tings and three Eaton DBU fuse units per fuse compartment.
††
NX fuses units: PSE fuse mountings will accommodate one
100 ampere Cooper (M-E) type NX current limiting fuse rated
8.3kV, one 100 ampere fuse rated 13.5kV, or one 80 ampere fuse
rated 15kV. ††
† The fuse must be replaced after each interruption. Refer to S&C
instruction manual for SM-4Z or SML-4Z holder and SML-20 end fitting
maintenance required after each fault-close or fault interruption.
Fuse Ratings
25kV Nominal
SM-4 fused units require three S&C Cat. No. 86633R2 SM-4Z
fuseholders and three S&C SM-4 fuse refills per fuse compart-
ment. ††
SMU-20 fused units require three S&C Cat. No. 3097 SM-20
fuse end fittings and three S&C SMU-20 fuse units per fuse
compartments. ††
DBU fused units require three FP Cat. No. EFA-42 DBU end fit-
tings and three Eaton DBU fuse units per fuse compartment.
††
NX fused units: PSE fuse mountings will accommodate one
100 ampere Cooper (McGraw-Edison) type NX current limiting
fuse rated 13.5kV, one 80 ampere fuse rated 15kV, or one 40
ampere fuse rated 23kV. ††
†† 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 (formerly Cutler-Hammer) Medium Voltage
Expulsion Fuses Catalog - CA01303001E.
Fuse
Manufacturer
Type†
Amperes, RMS
3-Phase
MVA
Sym
Max.
Cont.
Interrupting
Sym.
At 14.4 kV Nominal Voltage - 95kV BIL
S&C SM-4 200 12,500 310
S&C SM-20 200 14,000 350
Eaton DBU 200 14,000 350
Cooper (M-E) NX
50,000 620
At 25kV Nominal Voltage - 125kV BIL
S&C SM-4 200 12,500 540
S&C SM-20 200 12,500 540
Eaton DBU 200 12,500 540
Cooper (M-E) NX
50,000 1,080
At 35kV Nominal Voltage - 150kV BIL
S&C SM-20 200 8.45ka 505
Eaton (Cutler Hammer) DBU 200 8.45ka 505
35kV Nominal
SMU-20 fused units require three S&C Cat. No. 3097 SM-20
fuse end fittings and three S&C SMU-20 fuse units per fuse
compartments. ††
DBU fused units require three FP Cat. No. EFA-42 DBU end fittings
and three Eaton DBU fuse units per fuse compartment. ††
Applicable to All Voltages:
Ratings expressed in RMS amperes asymmetrical are 1.6 times
the symmetrical values listed.
Unit overall ratings are limited to the lowest component rating.
SM-5 fuses cannot be used in PSE Pad-mounted Switchgear.
Consult Factory.
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