®
Bussmann
E-Rated Medium Voltage Fuses
For Transformer and Feeder Protection
5.5 kV
ECL055
CATALOG SYMBOL: ECL055
E-RATED MEDIUM VOLTAGE FUSES:
Meets E requirements per ANSI C37.46
Meets General Purpose requirements per ANSI C37.40
FOR TRANSFORMER AND FEEDER PROTECTION
VOLTAGE RATING: 5.5 KV
INTERRUPTING RATING: 63KA Maximum Sym.
CURRENT LIMITING
CONSTRUCTION:
• Silver element in a double concentric helical configuration
• Silica filler
• Silver plated copper terminals and endcaps
• Filament wound, glass epoxy fuse tube
AGENCY APPROVALS: UL pending.
Electrical Characteristics
Ampere
# of
Barrels
FEATURES:
Part Number
Rating
500E
600E
750E
900E
Voltage
5kV
IR
Figure #
Style
•General Purpose Fuses. Bussmann’s medium voltage fuses
provide general purpose protection and are capable of interrupt-
ing fault currents up to 63,000A RMS sym.
•Clip-lock and bolt-in style available in double and triple
barrel fuse designs.
ECL055-500E
ECL055-600E
ECL055-750E
ECL055-900E
63kA
63kA
63kA
63kA
2
2
3
3
1
1
2
2
Clip-Lock
Clip-Lock
Bolt-In
5kV
5kV
5kV
Bolt-In
•Indoor and Outdoor Usage. The filament wound, glass epoxy
fuse tube provides UV and moisture protection for the fuse. This
makes Bussmann’s medium voltage fuses suitable for both
indoor and outdoor applications.
•Blown Fuse Indication. Indicator travel distance is 16mm.
• Operating Frequency: 50/60 Hz
Part Number Construction
Medium Voltage
Voltage Rating
055
Ampere Rating
Example
ECL
500E
055 = 5.5 kV
• Time Current Curves and Dimensional Data:
ECL055 series , see page 3.
• Peak Let-Through Curves. see page 3.
Catalog Number Cross Reference
Ferraz-Shawmut
Ferraz-Shawmut
Bussmann
New Catalog #
Old Catalog #
225-007-954
225-007-955
A550X 750E-4
A550X 900E-4
Cutler-Hammer
5HCL14-500E
5HCL14-600E
5HCL14-750E
5HCL14-900E
ECL055-500E
ECL055-600E
ECL055-750E
ECL055-900E
A055C2DORO-500E
A055C2DORO-600E
A055B3DORO-750E
A055B3DORO-900E
Current-limiting medium voltage fuses are classified into three categories:
Full Range - defined by ANSI as “a fuse capable of interrupting all currents from the maximum rated interrupting current down to the
minimum continuous current that causes melting of the fusible element(s), when the fuse is applied at the maximum ambient tempera-
ture specified by the manufacturer.” It is able to interrupt any normal 60 cycle current that will melt its element.
General Purpose - defined by ANSI C37.40 as “a fuse capable of interrupting all currents from the maximum rated interrupting cur-
rent down to the current that causes melting of the fusible element in one hour.” Not all currents fall within this range. It is possible to
receive an overcurrent lower than the value given by the one hour criterion.
Back-up - defined by ANSI C37.40 as “a fuse capable of interrupting all currents from the maximum rated interrupting current down
to the rated minimum interrupting current.” The minimum rated interrupting current is the lowest current that the fuse will be able to
clear properly. This creates a need to place a low current interrupting device in series with the back-up rated fuse.
Form No. ECL055
4-5-00
Page 1 of 3
SB00020
Rev. A
BIF Doc. #9002
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