Document Outline

Medium Voltage Fuses
- Medium Voltage Fuses

Medium Voltage Fuses

2400 - 25,500 VAC

Current Limiting

Littelfuse now offers a complete selection of "E" and "R"
rated medium voltage fuses for the protection of trans-
formers, 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 1-800-227-0029.

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 pro-
tection. 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 inter-
rupt 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 the POWR-GARD Products
catalog (PF101).

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.

Bolt-in Mount Fuses

R Rated Medium Voltage Fuses

Current Limiting

FEATURES

"R" rated fuses provide required short-circuit protection for
medium voltage motors, motor controllers and associated
circuitry. These components have limited ability to absorb the
energy of large short circuit currents. Medium voltage motor
controllers contain overload relays which provide both over-
load protection and locked rotor protection to the motor. The
controllers are also intended to interrupt low value short cir-
cuits within the capability of the motor controller. This pro-
tects the medium voltage fuse from sustained overcurrents
which are less than their minimum interrupting rating.

NEMA Standards for "R" rated medium voltage power fuses
require that they operate within 15-35 seconds when sub-
jected to an rms current 100 times the "R" rating. For exam-
ple, a fuse with a 2R rating will open within 15 to 35 seconds
on an applied current of 2 x 100 = 200 amperes.

Part Number System

130 - 4R -1C - 5.5

Catalog

Number

70-2R-1C-2.75
100-3R-1C-2.75
130-4R-1C-2.75
150-5R-1C-2.75
170-6R-1C-2.75
200-9R-1C-2.75
230-12R-1C-2.75

390-18R-2C-2.75
450-24R-2C-2.75

2.75 KV

3"DIA

Dim.A

Clip

Center

6.38"

Dim.B

9.75"

DDD

Old

Catalog

Number

LCK 2R
LCK 3R
LCK 4R
LCK 5R
LCK 6R
LCK 9R
LCK 12R

LCK 18R
LCK 24R

Size

2R
3R
4R
5R
6R
9R

12R

18R
24R

Maximum

Continuous

Current

@ 40 deg C.

100
130
150
170
200
230

390
450

Dim. A

(inches)

Dim. B

(inches)

10.875"

Minimum

Interrupting

Rating

RMS Amps

170
250
340
390
500
760

1000

1500
1950

Max

Interrupting

Rating

RMS Asym

80,000
80,000
80,000
80,000
80,000
80,000
80,000

80,000
80,000

Figure

Number

1
1
1
1
1
1
1

2
2

CHARACTERISTICS

Voltage Rating: 2,400 volts � 15,500 volts

Current Range: 2R � 36R

OPTIONS

Hermitically sealed for use in hazardous locations
(add "S" suffix to part number)

Hookeye attachment (add "W" suffix to part number)

Bolt-in mounting configurations

RATED

FIGURE 1

FIGURE 2

FIGURE 3

Hookeye
Feature*

*For hookeye attach-

ment; add "W" suffix
to part number

Max Voltage (KV)

Style (C-Cartridge)

No. of Barrels

Rating (size)

Continuous Current

Add "w" suffix to part number for hookeye attachment.

R Rated Medium Voltage Fuses

Current Limiting

5.5 KV

14"Clip Center

RATED

5.5 KV

3"DIA

Dim.A

(Clip

Center)

6.38"

Dim.B

9.75"

Catalog

Number

70-2R-1C-5.5
100-3R-1C-5.5
130-4R-1C-5.5
150-5R-1C-5.5
170-6R-1C-5.5
200-9R-1C-5.5
230-12R-1C-5.5

390-18R-2C-5.5
450-24R-2C-5.5
480-26R-2C-5.5
550-30R-2C-5.5
600-32R-2C-5.5
650-36R-2C-5.5

550-30R-3C-5.5
600-32R-3C-5.5
650-36R-3C-5.5

Old

Catalog

Number

LCL 2R
LCL 3R
LCL 4R
LCL 5R
LCL 6R
LCL 9R

LCL 12R

LCL 18R
LCL 24R

--
--
--
--

--
--

LCL 36R

Size

2R
3R
4R
5R
6R
9R

12R

18R
24R
26R
30R
32R
36R

30R
32R
36R

Maximum

Continuous

Current

@ 40 deg C.

100
130
150
170
200
230

390
450
480
550
600
650

550
600
650

Dim. A

(inches)

12"

Dim. B

(inches)

15.875"

Minimum

Interrupting

Rating

RMS Amps

170
250
340
390
500
760

1000

1500
1950
2100
2400
2600
2900

2400
2600
2900

Max

Interrupting

Rating

RMS (Asym)

80,000
80,000
80,000
80,000
80,000
80,000
80,000

80,000
80,000
80,000
80,000
80,000
80,000

80,000
80,000
80,000

Figure

Number

4
4
4
4
4
4
4

5
5
5
5
5
5

6
6
6

70-2R-1C-5.5X
100-3R-1C-5.5X
130-4R-1C-5.5X
150-5R-1C-5.5X
170-6R-1C-5.5X
200-9R-1C-5.5X
230-12R-1C-5.5X

390-18R-2C-5.5X
450-24R-2C-5.5X

--
--
--
--
--
--
--

--
--

2R
3R
4R
5R
6R
9R

12R

18R
24R

100
130
150
170
200
230

390
450

14"

17.875"

170
250
340
390
500
760

1000

1500
1950

80,000
80,000
80,000
80,000
80,000
80,000
80,000

80,000
80,000

4
4
4
4
4
4
4

5
5

RATED

8.25 KV

Catalog

Number

70-2R-1C-8.25
100-3R-1C-8.25
130-4R-1C-8.25
150-5R-1C-8.25
170-6R-1C-8.25
200-9R-1C-8.25
230-12R-1C-8.25

390-18R-2C-8.25
450-24R-2C-8.25

Old

Catalog

Number

--
--
--
--
--
--
--

--
--

Size

2R
3R
4R
5R
6R
9R

12R

18R
24R

Maximum

Continuous

Current

@ 40 deg C.

100
130
150
170
200
230

390
450

Dim. A

(inches)

12"

Dim. B

(inches)

15.875"

Minimum

Interrupting

Rating

RMS Amps

190
225
330
440
500
740
955

1440
1910

Max

Interrupting

Rating

RMS (Asym)

80,000
80,000
80,000
80,000
80,000
80,000
80,000

80,000
80,000

Figure

Number

4
4
4
4
4
4
4

5
5

FIGURE 4

FIGURE 5

FIGURE 6

Add "w" suffix to part number for hookeye attachment

R Rated Medium Voltage Fuses

Current Limiting

Dim.B

Dim.A

(2) .34" X .660 Slots

1.38" Apart

3" Dia.

(2) .34" Holes
1.38" Apart

Indicator

Dim.B

3" Dia.

Indicator

Bolt Mount "B"

Inverted Bolt "IB"

70-2R-1IB-2.75

100-3R-1IB-2.75
130-4R-1IB-2.75
150-5R-1IB-2.75
170-6R-1IB-2.75
200-9R-1IB-2.75
230-12R-1IB-2.75

390-18R-2IB-2.75
450-24R-2IB-2.75

2R
3R
4R
5R
6R
9R

12R

18R
24R

100
130
150
170
200
230

390
450

13"

170
250
340
390
500
760

1000

1500
1950

80,000
80,000
80,000
80,000
80,000
80,000
80,000

80,000
80,000

9
9
9
9
9
9
9

10
10

2.75 KV

ver

ted Bolt

"IB"

Catalog

Number

70-2R-1B-2.75

100-3R-1B-2.75
130-4R-1B-2.75
150-5R-1B-2.75
170-6R-1B-2.75
200-9R-1B-2.75
230-12R-1B-2.75

390-18R-2B-2.75
450-24R-2B-2.75

RATED

2.75 KV

Bolt Mount

"B"

Old

Catalog

Number

Size

2R
3R
4R
5R
6R
9R

12R

18R
24R

Maximum

Continuous

Current

@ 40 deg C.

100
130
150
170
200
230

390
450

Dim. A

(inches)

4.6"

7.4"

Dim. B

(inches)

13"

Minimum

Interrupting

Rating

RMS Amps

170
250
240
390
500
760

1000

1500
1950

Max

Interrupting

Rating

RMS (Asym)

80,000
80,000
80,000
80,000
80,000
80,000
80,000

80,000
80,000

Figure

Number

7
7
7
7
7
7
7

8
8

FIGURE 7

FIGURE 8

FIGURE 9

FIGURE 10

Littelfuse's POWR-GARD medium voltage fuses are
available in several bolt-in mounting configurations. Contact
factory for custom configurations

"B"

Bolt mount

"BI"

Bolt-In mount

"IB"

Inverted-Bolt mount

Refer to illustrations for mounting dimensions.

Catalog

Number

70-2R-1BI-5.5
100-3R-1BI-5.5
130-4R-1BI-5.5
150-5R-1BI-5.5
170-6R-1BI-5.5
200-9R-1BI-5.5
230-12R-1BI-5.5

390-18R-2BI-5.5
450-24R-2BI-5.5
480-26R-2BI-5.5
550-30R-2BI-5.5
600-32R-2BI-5.5
650-36R-2BI-5.5

550-30R-3BI-5.5
600-32R-3BI-5.5
650-36R-3BI-5.5
700-38R-3BI-5.5

Dim.B

Dim.A

Dim.B

Dim.A

3"Dia.

Front View

.44" X .91" Slots (1.53" c.t.c.)

Indicator

RATED

5.5 KV

Bolt In Mount

"BI"

Old

Catalog

Number

Size

2R
3R
4R
5R
6R
9R

12R

18R
24R
26R
30R
32R
36R

30R
32R
36R
38R

Maximum

Continuous

Current

@ 40 deg C.

100
130
150
170
200
230

390
450
480
550
600
650

550
600
650
700

Dim. A

(inches)

3.6

7.6

Dim. B

(inches)

18"

Minimum

Interrupting

Rating

RMS Amps

170
250
340
390
500
760

1000

1500
1950
2200
2400
2650
2900

Max

Interrupting

Rating

RMS (Asym)

80,000
80,000
80,000
80,000
80,000
80,000
80,000

80,000
80,000
80,000
80,000
80,000
80,000

80,000
80,000
80,000
80,000

Figure

Number

11
11
11
11
11
11
11

12
12
12
12
12
12

13
13
13
13

70-2R-1BI-8.25

100-3R-1BI-8.25
130-4R-1BI-8.25
150-5R-1BI-8.25
170-6R-1BI-8.25
200-9R-1BI-8.25
230-12R-1BI-8.25

390-18R-2BI-8.25
450-24R-2BI-8.25

8.25 KV

Bolt-In Mount

"BI"

2R
3R
4R
5R
6R
9R

12R

18R
24R

100
130
150
170
200
230

390
450

3.6

7.6

18"

190
225
330
400
500
740
955

1440
1910

80,000
80,000
80,000
80,000
80,000
80,000
80,000

80,000
80,000

11
11
11
11
11
11
11

12
12

Bolt-In Mount "BI"

5.5 KV

Bolt Mount

"B"

70-2R-1B-5.5

100-3R-1B-5.5
130-4R-1B-5.5
150-5R-1B-5.5
170-6R-1B-5.5
200-9R-1B-5.5
230-12R-1B-5.5

390-18R-2B-5.5
450-24R-2B-5.5
550-30R-2B-5.5
600-32R-2B-5.5
650-36R-2B-5.5

2R
3R
4R
5R
6R
9R

12R

18R
24R
30R
32R
36R

100
130
150
170
200
230

390
450
550
600
650

4.6

7.4

8.4

18"

170
250
340
390
500
760

1000

1500
1950
2400
2650
2900

80,000
80,000
80,000
80,000
80,000
80,000
80,000

80,000
80,000
80,000
80,000
80,000

7
7
7
7
7
7
7

8
8
8
8
8

FIGURE 11

FIGURE 12

FIGURE 13

70-2R-1IB-5.5
100-3R-1IB-5.5
130-4R-1IB-5.5
150-5R-1IB-5.5
170-6R-1IB-5.5
200-9R-1IB-5.5
230-12R-1IB-5.5

390-18R-2IB-5.5
450-24R-2IB-5.5
550-30R-2IB-5.5
600-32R-2IB-5.5
650-36R-2IB-5.5

2R
3R
4R
5R
6R
9R

12R

18R
24R
30R
32R
36R

100
130
150
170
200
230

390
450
550
600
650

18"

170
250
340
390
500
760

1000

1500
1950
2400
2650
2900

80,000
80,000
80,000
80,000
80,000
80,000
80,000

80,000
80,000
80,000
80,000
80,000

9
9
9
9
9
9
9

10
10
10
10
10

5.5 KV

ver

ted Bolt

"IB"

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Datasheet: 200-9R-1C-5.5 (Littelfuse)

Document Outline