Medium Voltage Fuses
64 www.littelfuse.com
Medium Voltage Fuses
© 2005 Littelfuse • POWR-GARD™ Products Catalog
Medium Voltage Fuses
2,400 - 38,000 VAC • Current-Limiting
Littelfuse now offers a complete selection of “E” and “R” rated
medium voltage fuses for the protection of transformers, potential
transformers, feeders, and motor circuits. Single, double, and triple
barrel designs are available to cover a wide range of current, voltage,
and interrupting ratings. Conventional ferrule type, clip lock, and bolt-in
mounting configurations are now available for virtually any application.
Hermetically sealed fuses for use in hazardous environments are also
offered.
Contact the factory or your local Littelfuse representative for additional
fuse ratings or custom mounting configurations.
24 Hour Emergency Service is available. Call 847 824 1188.
Applications
Power Transformer Protection
Potential Transformer Protection
Motor Controller Back-up Protection
Fused Switches
Feeder Circuits
General Information
The terms “Medium Voltage” and “High Voltage” have been used
interchangeably by many people to describe fuses operating above 600
volts. Technically speaking, “medium voltage” fuses are those intended
for the voltage range from 2,400 to 38,000 VAC. “High voltage” fuses
are for circuits carrying voltages greater than 38,000 VAC.
“E” rated fuses are considered to be general purpose fuses and can be
used to protect against low and high values of fault current. “R” rated
fuses are designed for back-up protection. They must be used in series
with other devices such as motor overload relays in order to achieve
both overload and short-circuit protection.
Medium voltage fuses are not intended to provide overload protection in
the same sense as fuses rated 600 volts or less. Medium voltage fuse
current ratings do not have the same meanings as the ampere ratings of
low voltage fuses.
All medium voltage fuses are limited in their ability to interrupt low value
overcurrents, especially those between 100% and 200% of the fuse’s
continuous current rating. They are designed to carry their rated current
without exceeding the temperature rise permitted by NEMA and ANSI
standards.
Additional application data can be found in the Fuse Application section
of this catalog.
Current-limiting “E” and “R” rated fuses
are equipped with a mechanical indicator
or striker pin that protrudes through the
fuse cap upon operation of the fuse. This
provides visual identification of a blown
fuse and can be used as a trigger for
external devices.
Note: Extension distance 1/2” min; extension
force 2lb. min
Bolt-in Mount Fuses
Medium Voltage Fuses
69
www.littelfuse.com
Medium Voltage Fuses
© 2005 Littelfuse • POWR-GARD™ Products Catalog
E Rated Medium Voltage Fuses
Current-Limiting
“E” Rated fuses have time current characteristics designed to
provide current-limiting protection for power transformers, potential
transformers, power centers, feeder centers, and unit sub stations.
When properly applied, they can protect against high and low fault
currents.
NEMA Standards for “E” rated medium voltage fuses require that
fuses rated 100E or less open within 300 seconds (5 minutes) when
subjected to an RMS value of 200-240% of the fuse continuous current
rating; and fuses with an “E” rating larger than 100E must open within
600 seconds (10 minutes) when subjected to an RMS current of 220-
240% of the fuse’s continuous current rating. These values establish
one point on the time-current curve.
Application Note:
Since these fuses are used for the protection of general purpose
circuits which may contain transformers, motors, and other equipment
producing in-rush and/or overload currents, fuses should generally be
rated at 140% of the normal full load current, and circuits should be
analyzed to ensure that system load currents will not exceed the current
rating of the fuse.
3"DIA
Dim.A
(Clip
Center)
6.38"
Dim.B
9.75"
AA
D DD DDD
Figure 14 Figure 15 Figure 16
Characteristics
Voltage Rating: 2,400 volts – 38,000 volts
Current Range: 10E – 600E
Options
• Hermetically sealed for use in hazardous locations
(add “S” suffix to part number)
• Clip-lock (CL) and bolt-in styles available.
E
Rated Catalog Number Old Catalog Number Size Dim. A (inches) Dim. B (inches) Max Interrupting
Rating RMS (Asym) Figure Number
2.75 Max. KV
10E-1C-2.75 LCX 10E 10E 7" 10.875" 80,000 14
15E-1C-2.75 — 15E 7" 10.875" 80,000 14
20E-1C-2.75 — 20E 7" 10.875" 80,000 14
25E-1C-2.75 — 25E 7" 10.875" 80,000 14
30E-1C-2.75 LCX 30E 30E 7" 10.875" 80,000 14
40E-1C-2.75 LCX 40E 40E 7" 10.875" 80,000 14
50E-1C-2.75 LCX 50E 50E 7" 10.875" 80,000 14
65E-1C-2.75 LCX 65E 65E 7" 10.875" 80,000 14
80E-1C-2.75 LCX 80E 80E 7" 10.875" 80,000 14
100E-1C-2.75 LCX 100E 100E 7" 10.875" 80,000 14
125E-1C-2.75 — 125E 7" 10.875" 80,000 14
150E-1C-2.75 — 150E 7" 10.875" 80,000 14
200E-1C-2.75 — 200E 7" 10.875" 80,000 14
125E-2C-2.75 LCX 125E 125E 7" 10.875" 80,000 15
150E-2C-2.75 LCX 150E 150E 7" 10.875" 80,000 15
175E-2C-2.75 LCX 175E 175E 7" 10.875" 80,000 15
200E-2C-2.75 LCX 200E 200E 7" 10.875" 80,000 15
225E-2C-2.75 — 225E 7" 10.875" 80,000 15
250E-2C-2.75 LCX 250E 250E 7" 10.875" 80,000 15
300E-2C-2.75 LCX 300E 300E 7" 10.875" 80,000 15
350E-2C-2.75 — 350E 7" 10.875" 80,000 15
400E-2C-2.75 LCX 400E 400E 7" 10.875" 80,000 15
450E-2C-2.75 — 450E 7" 10.875" 80,000 15
Medium Voltage Fuses
70 www.littelfuse.com
Medium Voltage Fuses
© 2005 Littelfuse • POWR-GARD™ Products Catalog
E
Rated Catalog Number Old Catalog Number Size Dim. A (inches) Dim. B (inches) Max Interrupting
Rating RMS (Asym) Diagram
5.5 Max. KV
10E-1C-5.5 — 10E 12" 15.875" 80,000 14
15E-1C-5.5 — 15E 12" 15.875" 80,000 14
20E-1C-5.5 — 20E 12" 15.875" 80,000 14
25E-1C-5.5 — 25E 12" 15.875" 80,000 14
30E-1C-5.5 LCY 30E 30E 12" 15.875" 80,000 14
40E-1C-5.5 LCY 40E 40E 12" 15.875" 80,000 14
50E-1C-5.5 LCY 50E 50E 12" 15.875" 80,000 14
65E-1C-5.5 LCY 60E 65E 12" 15.875" 80,000 14
80E-1C-5.5 LCY 80E 80E 12" 15.875" 80,000 14
100E-1C-5.5 LCY 100E 100E 12" 15.875" 80,000 14
125E-1C-5.5 LCY 125E 125E 12" 15.875" 80,000 14
150E-1C-5.5 LCY 150E 150E 12" 15.875" 80,000 14
175E-1C-5.5 LCY 175E 175E 12" 15.875" 80,000 14
200E-1C-5.5 LCY 200E 200E 12" 15.875" 80,000 14
125E-2C-5.5 — 125E 12" 15.875" 80,000 15
150E-2C-5.5 — 150E 12" 15.875" 80,000 15
175E-2C-5.5 — 175E 12" 15.875" 80,000 15
200E-2C-5.5 — 200E 12" 15.875" 80,000 15
250E-2C-5.5 LCY 250E 250E 12" 15.875" 80,000 15
300E-2C-5.5 LCY 300E 300E 12" 15.875" 80,000 15
350E-2C-5.5 LCY 350E 350E 12" 15.875" 80,000 15
400E-2C-5.5 LCY 400E 400E 12" 15.875" 80,000 15
450E-2C-5.5 LCY 450E 450E 12" 15.875" 80,000 15
500E-3C-5.5 — 500E 12" 15.875" 80,000 16
550E-3C-5.5 — 550E 12" 15.875" 80,000 16
600E-3C-5.5 — 600E 12" 15.875" 80,000 16
5.5 Max. KV
5NLE-10E — 10E 14” 177⁄8" 80,000 14
5NLE-15E — 15E 14” 177⁄8" 80,000 14
5NLE-20E — 20E 14” 177⁄8" 80,000 14
5NLE-25E — 25E 14” 177⁄8" 80,000 14
5NLE-30E LCU 30E 30E 14” 177⁄8" 80,000 14
5NLE-40E LCU 40E 40E 14” 177⁄8" 80,000 14
5NLE-50E LCU 50E 50E 14” 177⁄8" 80,000 14
5NLE-65E LCU 65E 65E 14” 177⁄8" 80,000 14
5NLE-80E LCU 80E 80E 14” 177⁄8" 80,000 14
5NLE-100E LCU 100E 100E 14” 177⁄8" 80,000 14
5NLE-125E LCU 125E 125E 14“ 177⁄8" 80,000 14
5NLE-150E LCU 150E 150E 14” 177⁄8" 80,000 14
5NLE-175E LCU 175E 175E 14” 177⁄8" 80,000 14
5NLE-200E LCU 200E 200E 14” 177⁄8" 80,000 14
5NLE2-225E — 225E 14” 177⁄8" 80,000 15
5NLE2-250E LCU 250E 250E 14” 177⁄8" 80,000 15
5NLE2-300E LCU 300E 300E 14” 177⁄8" 80,000 15
5NLE2-350E LCU 350E 350E 14” 177⁄8" 80,000 15
5NLE2-400E LCU 400E 400E 14” 177⁄8" 80,000 15
5NLE2-450E LCU 450E 450E 14” 177⁄8" 80,000 15
E Rated Medium Voltage Fuses
Current-Limiting
Medium Voltage Fuses
71
www.littelfuse.com
Medium Voltage Fuses
© 2005 Littelfuse • POWR-GARD™ Products Catalog
E
Rated Catalog Number Old Catalog Number Size Dim. A (inches) Dim. B (inches) Max Interrupting
Rating RMS (Asym) Diagram
8.25 Max. KV
10E-1C-8.25 — 10E 12" 157⁄8" 80,000, 14
15E-1C-8.25 — 15E 12" 157⁄8" 80,000 14
20E-1C-8.25 — 20E 12" 157⁄8" 80,000 14
25E-1C-8.25 — 25E 12" 157⁄8" 80,000 14
30E-1C-8.25 LDZ 30E 30E 12" 157⁄8" 80,000 14
40E-1C-8.25 LDZ 40E 40E 12" 157⁄8" 80,000 14
50E-1C-8.25 LDZ 50E 50E 12" 157⁄8" 80,000 14
65E-1C-8.25 LDZ 65E 65E 12" 157⁄8" 80,000 14
80E-1C-8.25 LDZ 80E 80E 12" 157⁄8" 80,000 14
100E-1C-8.25 LDZ 100E 100E 12" 157⁄8" 80,000 14
125E-1C-8.25 LDZ 125E 125E 12" 157⁄8" 80,000 14
150E-1C-8.25 LDZ 150E 150E 12" 157⁄8" 80,000 14
125E-2C-8.25 LDZ 125E 125E 12" 157⁄8" 80,000 15
150E-2C-8.25 LDZ 150E 150E 12" 157⁄8" 80,000 15
200E-2C-8.25 LDZ 200E 200E 12" 157⁄8" 80,000 15
250E-2C-8.25 LDZ 250E 250E 12" 157⁄8" 80,000 15
300E-2C-8.25 LDZ 300E 300E 12" 157⁄8" 80,000 15
350E-3C-8.25 LDZ 350Z 350E 12" 157⁄8" 80,000 16
400E-3C-8.25 — 400E 12" 157⁄8" 80,000 16
8.25 Max. KV
8NLE-10E — 10E 14" 177⁄8" 80,000 14
8NLE-15E — 15E 14" 177⁄8" 80,000 14
8NLE-20E — 20E 14" 177⁄8" 80,000 14
8NLE-25E — 25E 14" 177⁄8" 80,000 14
8NLE-30E LCZ 30E 30E 14" 177⁄8" 80,000 14
8NLE-40E LCZ 40E 40E 14" 177⁄8" 80,000 14
8NLE-50E LCZ 50E 50E 14" 177⁄8" 80,000 14
8NLE-65E LCZ 65E 65E 14" 177⁄8" 80,000 14
8NLE-80E LCZ 80E 80E 14" 177⁄8" 80,000 14
8NLE-100E LCZ 100E 100E 14" 177⁄8" 80,000 14
8NLE2-100E LCZ 100E 100E 14" 177⁄8" 80,000 14
8NLE2-125E LCZ 125E 125E 14" 177⁄8" 80,000 15
8NLE2-150E LCZ 150E 150E 14" 177⁄8" 80,000 15
8NLE2-200E LCZ 200E 200E 14" 177⁄8" 80,000 15
8NLE2-250E — 250E 14" 177⁄8" 80,000 15
E
Rated Catalog Number Old Catalog Number Size Dim. A (inches) Dim. B (inches) Max Interrupting
Rating RMS (Asym)
Figure
Number
15.5 Max. KV
10E-1C-15.5 LDN 10E 10E 15" 18.875" 80,000 14
15E-1C-15.5 LDN 15E 15E 15" 18.875" 80,000 14
20E-1C-15.5 LDN 20E 20E 15" 18.875" 80,000 14
25E-1C-15.5 LDN 25E 25E 15" 18.875" 80,000 14
30E-1C-15.5 LDN 30E 30E 15" 18.875" 80,000 14
40E-1C-15.5 LDN 40E 40E 15" 18.875" 80,000 14
50E-1C-15.5 LDN 50E 50E 15" 18.875" 80,000 14
65E-1C-15.5 LDN 65E 65E 15" 18.875" 80,000 14
80E-1C-15.5 LDN 80E 80E 15" 18.875" 80,000 14
100E-1C-15.5 LDN 100E 100E 15" 18.875" 80,000 14
65E-2C-15.5 — 65E 15" 18.875" 80,000 15
80E-2C-15.5 — 80E 15" 18.875" 80,000 15
100E-2C-15.5 — 100E 15" 18.875" 80,000 15
125E-2C-15.5 — 125E 15" 18.875" 80,000 15
150E-2C-15.5 LDN 150E 150E 15" 18.875" 80,000 15
175E-2C-15.5 LDN 175E 175E 15" 18.875" 80,000 15
200E-2C-15.5 — 200E 15" 18.875" 80,000 15
200E-3C-15.5 — 200E 15" 18.875" 80,000 16
250E-3C-15.5 — 250E 15" 18.875" 80,000 16
300E-3C-15.5 — 300E 15" 18.875" 80,000 16
E Rated Medium Voltage Fuses
Current-Limiting
Medium Voltage Fuses
72 www.littelfuse.com
Medium Voltage Fuses
© 2005 Littelfuse • POWR-GARD™ Products Catalog
E
Rated Catalog Number Old Catalog Number Size Dim. A (inches) Dim. B (inches) Max Interrupting
Rating RMS (Asym)
Figure
Number
15.5
Max. KV
15GSE-65E — 65E 18" 217⁄8" 60,000 14
15GSE-80E — 80E 18" 217⁄8" 60,000 14
15GSE-100E — 100E 18" 217⁄8" 60,000 14
15GSE2-125E — 125E 18" 217⁄8" 60,000 15
15GSE2-150E — 150E 18" 217⁄8" 60,000 15
15GSE2-175E — 175E 18" 217⁄8" 60,000 15
15GSE2-200E — 200E 18" 217⁄8" 60,000 15
15.5 Max. KV
15NLE-10E — 10E 20" 237⁄8" 60,000 14
15NLE-15E — 15E 20" 237⁄8" 60,000 14
15NLE-20E — 20E 20" 237⁄8" 60,000 14
15NLE-25E — 25E 20" 237⁄8" 60,000 14
15NLE-30E LCN 30E 30E 20" 237⁄8" 60,000 14
15NLE-40E LCN 40E 40E 20" 237⁄8" 60,000 14
15NLE-50E LCN 50E 50E 20" 237⁄8" 60,000 14
15NLE-65E LCN 65E 65E 20" 237⁄8" 60,000 14
15NLE-80E LCN 80ES 80E 20" 237⁄8" 60,000 14
15NLE-100E LCN 100ES 100E 20" 237⁄8" 60,000 14
15NLE2-80E LCN 80E 80E 20" 237⁄8" 60,000 15
15NLE2-100E LCN 100E 100E 20" 237⁄8" 60,000 15
15NLE2-125E LCN 125X 125E 20" 237⁄8" 60,000 15
15NLE2-150E LCN 150E 150E 20" 237⁄8" 60,000 15
15NLE2-175E — 175E 20" 237⁄8" 60,000 15
15NLE2-200E LCN 200ED 200E 20" 237⁄8" 60,000 15
15NLE3-150E — 150E 20" 237⁄8" 60,000 16
15NLE3-175E — 175E 20" 237⁄8" 60,000 16
15NLE3-250E — 250E 20" 237⁄8" 60,000 16
15NLE3-300E — 300E 20" 237⁄8" 60,000 16
E
Rated Catalog Number Old Catalog Number Size Dim. A (inches) Dim. B (inches) Max Interrupting
Rating RMS (Asym)
Figure
Number
25.8 Max. KV
15E-1C-25.8 — 15E 21" 245⁄8" 40,000 14
20E-1C-25.8 — 20E 21" 245⁄8" 40,000 14
25E-1C-25.8 — 25E 21" 245⁄8" 40,000 14
30E-1C-25.8 — 30E 21" 245⁄8" 40,000 14
40E-1C-25.8 — 40E 21" 245⁄8" 40,000 14
50E-1C-25.8 — 50E 21" 245⁄8" 40,000 14
65E-2C-25.8 — 65E 21" 245⁄8" 40,000 14
80E-2C-25.8 — 80E 21" 245⁄8" 40,000 15
100E-2C-25.8 — 100E 21" 245⁄8" 40,000 15
E
Rated Catalog Number Old Catalog Number Size Dim. A (inches) Dim. B (inches) Max Interrupting
Rating RMS (Asym)
Figure
Number
38 Max. KV
3E-1C-38.0 — 3E 27" 305⁄8" 20,000 14
7E-1C-38.0 — 7E 27" 305⁄8" 20,000 14
10E-1C-38.0 — 10E 27" 305⁄8" 20,000 14
15E-1C-38.0 — 15E 27" 305⁄8" 20,000 14
20E-1C-38.0 — 20E 27" 305⁄8" 20,000 14
25E-1C-38.0 — 25E 27" 305⁄8" 20,000 14
30E-1C-38.0 — 30E 27" 305⁄8" 20,000 14
40E-1C-38.0 — 40E 27" 305⁄8" 20,000 14
50E-2C-38.0 — 50E 27" 305⁄8" 20,000 15
65E-2C-38.0 — 65E 27" 305⁄8" 20,000 15
80E-2C-38.0 — 80E 27" 305⁄8" 20,000 15
E Rated Medium Voltage Fuses
Current-Limiting
Medium Voltage Fuses
73
www.littelfuse.com
Medium Voltage Fuses
© 2005 Littelfuse • POWR-GARD™ Products Catalog
E
Rated Catalog Number Old Catalog Number Size Dim. A (inches) Dim. B (inches) Max Interrupting
Rating RMS (Asym)
Figure
Number
5.5 Max. KV
Clip Lock
10E-1CL-5.5 — 10E 16.38" 15.13" 80,000 17
15E-1CL-5.5 — 15E 16.38" 15.13" 80,000 17
20E-1C-5.5 — 20E 16.38" 15.13" 80,000 17
25E-1CL-5.5 — 25E 16.38" 15.13" 80,000 17
30E-1CL-5.5 — 30E 16.38" 15.13" 80,000 17
40E-1CL-5.5 — 40E 16.38" 15.13" 80,000 17
50E-1CL-5.5 — 50E 16.38" 15.13" 80,000 17
65E-1CL-5.5 — 65E 16.38" 15.13" 80,000 17
80E-1CL-5.5 — 80E 16.38" 15.13" 80,000 17
100E-1CL-5.5 — 100E 16.38" 15.13" 80,000 17
125E-1CL-5.5 — 125E 16.38" 15.13" 80,000 17
150E-1CL-5.5 — 150E 16.38" 15.13" 80,000 17
225E-2CL-5.5 — 225E 17.38" 16.13" 80,000 18
250E-2CL-5.5 — 250E 17.38" 16.13" 80,000 18
300E-2CL-5.5 — 300E 17.38" 16.13" 80,000 18
350E-2CL-5.5 — 350E 17.38" 16.13" 80,000 18
400E-2CL-5.5 — 400E 17.38" 16.13" 80,000 18
450E-2CL-5.5 — 450E 17.38" 16.13" 80,000 18
500E-3CL-5.5 — 500E 17.38" 16.13" 80,000 19
550E-3CL-5.5 — 550E 17.38" 16.13" 80,000 19
600E-3CL-5.5 — 600E 17.38" 16.13" 80,000 19
E
Rated Catalog Number Old Catalog Number Size Dim. A (inches) Dim. B (inches) Max Interrupting
Rating RMS (Asym)
Figure
Number
8.25 Max. KV
Clip Lock
10E-1CL-8.25 — 10E 17.38" 16.13" 80,000 17
15E-1CL-8.25 — 15E 17.38" 16.13" 80,000 17
20E-1C-8.25 — 20E 17.38" 16.13" 80,000 17
25E-1CL-8.25 — 25E 17.38" 16.13" 80,000 17
30E-1CL-8.25 — 30E 17.38" 16.13" 80,000 17
40E-1CL-8.25 — 40E 17.38" 16.13" 80,000 17
50E-1CL-8.25 — 50E 17.38" 16.13" 80,000 17
65E-1CL-8.25 — 65E 17.38" 16.13" 80,000 17
80E-1CL-8.25 — 80E 17.38" 16.13" 80,000 17
100E-1CL-8.25 — 100E 17.38" 16.13" 80,000 17
125E-2CL-8.25 — 125E 17.38" 16.13" 80,000 18
150E-2CL-8.25 — 150E 17.38" 16.13" 80,000 18
175E-2CL-8.25 — 175E 17.38" 16.13" 80,000 18
200E-2CL-8.25 — 200E 17.38" 16.13" 80,000 18
225E-2CL-8.25 — 225E 17.38" 16.13" 80,000 18
250E-2CL-8.25 — 250E 17.38" 16.13" 80,000 18
300E-2CL-8.25 — 300E 17.38" 16.13" 80,000 18
350E-3CL-8.25 — 350E 17.38" 16.13" 80,000 19
E
Rated Catalog Number Old Catalog Number Size Dim. A (inches) Dim. B (inches) Max Interrupting
Rating RMS (Asym)
Figure
Number
15.5 Max. KV
Clip Lock
10E-1CL-15.5 — 10E 19.8" 18.1" 60,000 17
15E-1CL-15.5 — 15E 19.8" 18.1" 60,000 17
20E-1CL-15.5 — 20E 19.8" 18.1" 60,000 17
25E-1CL-15.5 — 25E 19.8" 18.1" 60,000 17
30E-1CL-15.5 — 30E 19.8" 18.1" 60,000 17
40E-1CL-15.5 — 40E 19.8" 18.1" 60,000 17
50E-1CL-15.5 — 50E 19.8" 18.1" 60,000 17
65E-1CL-15.5 — 65E 22.81" 21.13" 60,000 17
80E-1CL-15.5 — 80E 22.81" 21.13" 60,000 17
100E-1CL-15.5 — 100E 22.81" 21.13" 60,000 17
125E-2CL-15.5 — 125 22.81" 19.1" 60,000 18
150E-3CL-15.5 — 150E 22.81" 19.1" 60,000 19
175E-3CL-15.5 — 175E 22.81" 19.1" 60,000 19
200E-3CL-15.5 — 200E 22.81" 19.1" 60,000 19
225E-3CL-15.5 — 225E 22.81" 19.1" 60,000 19
250E-3CL-15.5 — 250E 22.81" 19.1" 60,000 19
300E-3CL-15.5 — 300E 22.81" 19.1" 60,000 19
E Rated Medium Voltage Fuses
Current-Limiting
4.75 7.94 11.56
1.25
AB
1.25
.25
3.0
Clip Lock Design
The clip lock type designs ensures a positive contact between the fuse
and the connection cam. The fuse’s clip lock tab slides in between the
clip casting and the cam to prevent the fuse from slipping or blowing out
of the holder. This positive contact improves heat dissipation and allows
fuses to run cooler. Figure 17 Figure 18 Figure 19
Medium Voltage Fuses
74 www.littelfuse.com
Medium Voltage Fuses
© 2005 Littelfuse • POWR-GARD™ Products Catalog
E Rated Potential Transformer Fuses
Current-Limiting
A
B
Potential Transformer (PT) fuses are current-limiting fuses with high
interrupting ratings designed for the protection of potential transformers.
Application Note:
When applying fuses for the protection of transformers, the magnetizing
current in-rush must be considered. The characteristics of the in-rush,
which can be matched with a fuse time-current curve, should be
available from the transformer manufacturer.
Characteristics
Voltage Rating: 600VAC – 25,500 VAC
Current Range: 1/2E – 10E
E
Rated Catalog Number Old Catalog Number Size Length Dim. A (inches) Diameter Dim. B (inches) Max Interrupting
Rating RMS (Sym)
600
Volt
3E-4PT-6 — 3E 4.6” 0.8125” 37,500
5E-4PT-6 — 5E 4.6” 0.8125” 37,500
7E-4PT-6 — 7E 4.6” 0.8125” 37,500
10E-4PT-6 — 10E 4.6” 0.8125” 37,500
2.75
Max.
kV
500E-4PT-2.4 — 1/2E 4.6” 0.8125” 37,000
1E-4PT-2.4 LCD 1E-4 1E 4.6” 0.8125” 37,000
2E-4PT-2.4 LCD 2E-4 2E 4.6” 0.8125” 37,000
2.75
Max.KV
1E-6PT-2.75 — 1E 7.4” 1.5625” 37,500
2E-6PT-2.75 — 2E 7.4” 1.5625” 37,500
3E-6PT-2.75 — 3E 7.4” 1.5625” 37,500
1E-8PT-2.75 — 1E 9.5” 1.5625” 37,000
2E-8PT-2.75 — 2E 9.5” 1.5625” 37,000
3E-8PT-2.75 — 3E 9.5” 1.5625” 37,000
4.8
Max.
kV
1E-5PT-4.8 LCE 1E-4 1E 5.6” 0.8125” 50,000
2E-5PT-4.8 LCE 2E-4 2E 5.6” 0.8125” 50,000
5.5
Max. kV
1/2E-6PT-5.5 — 1/2E 7.4” 1.5625” 50,000
1E-6PT-5.5 — 1E 7.4” 1.5625” 50,000
2E-6PT-5.5 — 2E 7.4” 1.5625” 50,000
3E-6PT-5.5 — 3E 7.4” 1.5625” 50,000
5E-6PT-5.5 — 5E 7.4” 1.5625” 50,000
1/2E-8PT-5.5 LCQ .5E 1/2E 9.5” 1.5625” 50,000
1E-8PT-5.5 LCQ 1E 1E 9.5” 1.5625” 50,000
2E-8PT-5.5 LCQ 2E 2E 9.5” 1.5625” 50,000
3E-8PT-5.5 LCQ 3E 3E 9.5” 1.5625” 50,000
5E-8PT-5.5 LCQ 5E 5E 9.5” 1.5625” 50,000
10E-8PT-5.5 LCQ 10E 10E 9.5” 1.5625” 50,000
8.25
Max.
kV
1/2E-8PT-8.25 — 1/2E 9.5” 1.5625” 50,000
1E-8PT-8.25 — 1E 9.5” 1.5625” 50,000
2E-8PT-8.25 — 2E 9.5” 1.5625” 50,000
3E-8PT-8.25 — 3 9.5” 1.5625” 50,000
15.5
Max. kV
1/2E-11PT-15.5 LCT .5E 1/2E 12.8” 1.5625” 35,000
1E-11PT-15.5 LCT 1E 1E 12.8” 1.5625” 35,000
2E-11PT-15.5 LCT 2E 2E 12.8” 1.5625” 35,000
3E-11PT-15.5 LCT 3E 3E 12.8” 1.5625” 35,000
3E-16PT-15.5 — 3E 17.5” 1.5625” 35,000
5E-16PT-15.5 — 5E 17.5” 1.5625” 35,000
25.8
Max.
kV
1/2E-16PT-25.5 LCJ 1E-4 1/2E 17.5” 1.5625” 43,500
1E-16PT-25.5 LCJ 2E-4 1E 17.5” 1.5625” 43,500
Medium Voltage Fuses
75
www.littelfuse.com
Medium Voltage Fuses
© 2005 Littelfuse • POWR-GARD™ Products Catalog
Live Parts
TRIPLE BARREL
Bottom Lever In
Closed Position
.56 Dia. (2) Holes
For Mounting
Cable/Bus
.44 DIA. (2) HOLES
DOUBLE BARREL
SINGLE BARREL
1.75
1.00
2.00
2.00
2.00
4.9
4.85
3.63
3.63
3.75
Top Lever in
Open Position
A
Blown Fuse
Indicator
TOP
VIEW
4.50
3.08
1.50
4.16
.038" HOLES
.78 .63
.08
.30
.31
.08
.71
1.15 .05
.78
Live parts are available for mounting “E”, “R”, and “PT” single, double, and triple barrel fuses.
Mounting clips are available for ferrule type and clip lock style fuses. All clips are sold in pairs.
Contact factory for additional live parts.
Part Number: 700-520-CL*
System Number: 0700520.ZXCL
Clip Lock Design (For CL-14)
Part Number: 700-530*
System Number: 0700530.Z
For use with all 3" diameter fuses.
* One Pair. Dimensions for reference only.
Part Number: 700-500*
System Number: 0700500.Z
For use with all 13/16" (.8125”)
diameter PT fuses.
Mounting Details for Clip Lock
Part Number: 700-156*
System Number: 0700156.Z
For use with 1-9/16" to 1-5/8” (1.625”) diameter PT fuses.
Part Number: 700-300*
System Number: 0700300.Z
For use with 3" diameter fuses.
2.85
2.00
3.74
