The fuse’s highly efficient current-limiting section
minimizes the effects of high fault current
stresses on equipment and the distribution
system. Its minimum interrupting rating is
coordinated with that of a low current interrupter
to avoid undesirable low current operation; yet its
maximum interrupting rating will clear the highest
fault currents likely to occur. Higher continuous
current ratings can be achieved by connecting two
fuses in parallel.
Application
The ELSP fuse is used in transformers to protect
and isolate faulted equipment. When connected
in series with a low current primary protection
device, the fuse becomes an element of a two-
part protection system that gives a full range of
fault protection.
This two-part system provides low current
protection with the replaceable expulsion fuse
or resettable MagneX interrupter, and it adds the
energy-limiting protection of a current-limiting
fuse. Together, they coordinate easily with
upstream and downstream devices.
Technical Data
TD132002EN
Effective October 2014
ELSP current-limiting backup fuse
HIGH PURITY SILICA SAND FILLER
Specific particle size, purity, and
compaction gives the heat-absorbing
and arc-quenching properties
necessary for consistent clearing and
low energy let-thru levels.
MICA SPIDER
Provides stable winding
support without generating
gas and pressure buildup
during fuse operation.
A
B
C
SOLID COPPER END CAPS
Brass inserts are tapped for
attachment of a
1
/
4
inch -
20 x
1
/
2
inch lead hardware.
DOUBLE SEALING
SYSTEM Buna-N rubber
gasket and epoxy sealant
ensures seal performance
and integrity.
FIBERGLASS HOUSING
Provides strength and maintains
integrity of fuse during any
interruption, from minimum
melt current to maximum rated
current of 50 kA.
INDELIBLE IDENTIFICATION LABEL
Easy-to-read voltage and current
ratings and catalog numbers.
FUSE ELEMENT
Stable under current cycling
and thermal stress, providing
consistent melt characteristics.
The ribbons effectively control
and minimize peak arc voltage
levels resulting from high current
interruptions. During interruption,
the element effectively controls
and limits both current and
energy (l
2
t) let-thru levels.
Figure 1. 2” diameter ELSP current-limiting back-up fuse cutaway shows design characteristics. See Table 3 for dimensional
information.
Note:
Dimensions given are for reference only.
B
C
Figure 2. 3” diameter ELSP current-limiting backup fuse photograph shows design characteristics. See Table 3 for dimensional
values.
Note:
Dimensions given are for reference only.
Installation
No special tools are required. The fuse
is liquid immersed, mounted as near as
possible to the incoming primary bushing
to which it is connected. Normal liquid
dielectric clearances should be used. Refer
to
Service Information MN132001EN ELSP
Current-Limiting Backup Fuse Installation
Instructions
for details.
Production tests
Tests are conducted on 100 percent of
production in accordance with Eaton’s
Cooper Power Systems requirements.
•
•
•
•
Physical Inspection
I
2
t Testing
Resistance Testing
Helium Mass Spectrometer Leak Testing
2
www.cooperpower.com
ELSP current-limiting backup fuse
Technical Data
TD132002EN
Effective October 2014
Table 1. Electrical Ratings and Characteristics
Fuse Type
Maximum Interrupting
Current
8.3 kV - 15.5 kV Backup “C” Rated
17.2 kV Backup “C” Rated
23 kV Backup “C” Rated
38 kV Backup “C” Rated
* 23 kV, 150 A fuse is rated to 50,000 A rms symmetrical
50,000 A rms symmetrical
43,000 A rms symmetrical
31,000 A rms symmetrical*
50,000 A rms symmetrical
Table 2. Interrupting Ratings
8.3 kV
Continuous
Current
Rating (A)
Minimum
Interrupting
Capacity (A)
Minimum
Melt I
2
t
(A2•s)
Maximum
Clear I
2
t
(A2•s)
9.9 kV
Minimum
Interrupting
Capacity (A)
Minimum
Melt I
2
t
(A2•s)
Maximum
Clear I
2
t
(A2•s)
15.5 kV
Minimum
Interrupting
Capacity (A)
Minimum
Melt I
2
t
(A2•s)
Maximum
Clear I
2
t
(A2•s)
30
40
50
65
80
100
125
150
165
180
250
250 **
300 **
330 **
360 **
500 **
200
250
330
400
300
450
470
700
800
900
1,000
–
1,300
1,500
1,800
2,000
17.2 kV
1,800
2,900
6,300
9,300
11,600
20,600
32,100
58,500
82,200
103,100
148,500
–
234,200
328,900
412,500
594,000
9,400
14,000
30,000
33,000
56,000
76,000
120,000
290,000
395,000
485,000
690,000
–
1,280,000
1,700,000
2,100,000
2,500,000
200
250
330
400
300
450
–
–
–
–
–
–
–
–
–
–
23 kV
1,800
2,900
6,300
9,300
11,600
20,600
–
–
–
–
–
–
–
–
–
–
9,500
14,000
30,000
34,000
56,000
76,000
–
–
–
–
–
–
–
–
–
–
200
250
330
400
350
450
500
700
800
900
–
1100
1230
–
–
–
38 kV
1,800
2,900
6,300
9,300
11,600
20,600
32,100
58,500
82,200
103,100
–
128,500
234,200
–
–
–
10,000
19,000
33,000
40,000
62,000
116,000
150,000
260,000
365,000
445,000
–
500,000
1,300,000
–
–
–
Continuous
Current
Rating (A)
Minimum
Interrupting
Capacity (A)
Minimum
Melt I
2
t
(A2•s)
Maximum
Clear I
2
t
(A2•s)
Minimum
Interrupting
Capacity (A)
Minimum
Melt I
2
t
(A2•s)
Maximum
Clear I
2
t
(A2•s)
Minimum
Interrupting
Capacity (A)
Minimum
Melt I
2
t
(A2•s)
Maximum
Clear I
2
t
(A2•s)
30
40
50
65
80
100
120
125
140
150
165
250 **
300 **
330 **
200
250
330
400
350
450
–
500
–
–
–
–
–
–
1,800
2,900
6,300
9,300
11,600
20,600
–
32,100
–
–
–
–
–
–
10,000
19,500
34,000
42,000
62,000
116,000
–
150,000
–
–
–
–
–
–
200
250
330
400
300
450
–
465
–
700
900
900
1200
1500
1,800
2,900
6,300
9,300
11,600
20,600
–
32,100
–
58,500
82,200
128,500
234,200
328,900
12,000
20,000
39,000
44,000
70,000
120,000
–
180,000
–
320,000
430,000
650,000
1,300,000
1,700,000
–
–
450
490
625
635
700
–
800
–
–
–
–
–
–
–
3,870
7,160
11,450
16,100
21,200
–
36,240
–
–
–
–
–
–
–
30,600
39,300
60,700
80,500
118,000
–
163,000
–
–
–
–
–
Notes:
1. The 8.3 kV, 80 A and 100 A ratings have been tested and approved for application at 9.9 kV.
2. The 15.5 kV, 80 A through 125 A ratings have been tested and approved for application at 17.2 kV.
The maximum interrupting rating for the 15.5 kV fuse, 80 A through 125 A at 17.2 kV is 43 kA. For the 23 kV, 250 A fuse (parallel 125 A) the maximum interrupting rating is 12 kA.
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