littelfuse.com

Rev: 063014

4 of 10

E-RATED MEDIUM VOLTAGE FUSES

Description

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"

A

D

DD

DDD

Figure 4

Figure 5

Figure 6

Characteristics

Voltage Ratings

2,750 V – 38,000 V

Current Range

10E – 600E

Options

• Hermetically sealed for use in hazardous locations

(add “S” suffix to part number)

• Clip-lock (CL) available.

NUMBER

SIZE

DIM. A (INCHES)

DIM. B (INCHES)

MAX INTERRUPTING

RATING RMS (ASYM)*

FIGURE

NUMBER

10E1C2.75

10E

7"

10.875"

80,000

4

15E1C2.75

15E

7"

10.875"

80,000

4

20E1C2.75

20E

7"

10.875"

80,000

4

25E1C2.75

25E

7"

10.875"

80,000

4

30E1C2.75

30E

7"

10.875"

80,000

4

40E1C2.75

40E

7"

10.875"

80,000

4

50E1C2.75

50E

7"

10.875"

80,000

4

65E1C2.75

65E

7"

10.875"

80,000

4

80E1C2.75

80E

7"

10.875"

80,000

4

100E-1C2.75

100E

7"

10.875"

80,000

4

125E1C2.75

125E

7"

10.875"

80,000

4

150E1C2.75

150E

7"

10.875"

80,000

4

200E1C2.75

200E

7"

10.875"

80,000

4

125E2C2.75

125E

7"

10.875"

80,000

5

150E2C2.75

150E

7"

10.875"

80,000

5

200E2C2.75

200E

7"

10.875"

80,000

5

250E2C2.75

250E

7"

10.875"

80,000

5

300E2C2.75

300E

7"

10.875"

80,000

5

350E2C2.75

350E

7"

10.875"

80,000

5

400E2C2.75

400E

7"

10.875"

80,000

5

450E2C2.75

450E

7"

10.875"

80,000

5

Dimensions

* RMS Asymmetrical amperes = RMS Symmetrical amperes x 1.6