E Rated Medium Voltage Fuses
Current Limiting
鈥淓鈥?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 value fault currents.
NEMA Standards for 鈥淓鈥?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鈥檚 continuous current rating; and fuses with an 鈥淓鈥?/div>
rating larger than 100E must open within 600 seconds (10
minutes) when subjected to an rms current of 220-240% of
the fuse鈥檚 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 inrush and/or overload cur-
rents, 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.
CHARACTERISTICS
Voltage Rating:
2,400 volts 鈥?38,000 volts
Current Range:
10E 鈥?600E
OPTIONS
I
I
Hermetically Sealed for use in hazardous locations
(add 鈥淪鈥?suffix to part number)
Clip-lock (CL) and bolt-in styles available.
3"DIA
6.38"
9.75"
Dim.A
(Clip
Center)
Dim.B
FIGURE 14
FIGURE 15
FIGURE 16
E
RATED
Catalog
Number
10E-1C-2.75
15E-1C-2.75
20E-1C-2.75
25E-1C-2.75
30E-1C-2.75
40E-1C-2.75
50E-1C-2.75
65E-1C-2.75
80E-1C-2.75
100E-1C-2.75
125E-1C-2.75
150E-1C-2.75
200E-1C-2.75
125E-2C-2.75
150E-2C-2.75
175E-2C-2.75
200E-2C-2.75
225E-2C-2.75
250E-2C-2.75
300E-2C-2.75
350E-2C-2.75
400E-2C-2.75
450E-2C-2.75
Old
Catalog
Number
LCX 10E
鈥?/div>
鈥?/div>
鈥?/div>
LCX 30E
LCX 40E
LCX 50E
LCX 65E
LCX 80E
LCX 100E
鈥?/div>
鈥?/div>
鈥?/div>
LCX 125E
LCX 150E
LCX 175E
LCX 200E
LCX 250E
LCX 300E
LCX 400E
鈥?/div>
Size
10E
15E
20E
25E
30E
40E
50E
65E
80E
100E
125E
150E
200E
125E
150E
175E
200E
225E
250E
300E
350E
400E
450E
Dim. A
(inches)
Dim. B
(inches)
Max
Interrupting
Rating
RMS (Asym)
7"
10.875"
80,000
7"
10.875"
80,000
Figure
Number
14
14
14
14
14
14
14
14
14
14
14
14
14
15
15
15
15
15
15
15
15
15
15
2.75 Max. KV
67
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