Molded Current-Limiting Fuse
Molded Current-Limiting Fuses
provide full-
range fault current protection using specially
designed fuse elements, rated through 23kV line
to ground and 50kA interrupting current.
Construction is modular with a center replaceable
fuse section and interchangeable end fittings
for elbow connection or direct attachment to
equipment mounted bushings. The various end
fittings allow fuses to be applied throughout
the system including switchgear, junctions,
transformers, cable runs and taps.
Elastimold
®
Molded Current-Limiting Fuses are
available in:
• 80 thru 180 Amp ratings for applications on
5kV systems (see Table 1)
• 6 thru 115 Amp ratings for applications on
8.7/15kV grounded Wye systems (see Table 1)
• 6 thru 100 Amp ratings for applications on
15/25kV grounded Wye systems (see Table 1)
• 6 thru 50 Amp ratings for applications on
20/35kV grounded Wye systems (see Table 1)
Fuses
FEATURE
E
PDM Molded Rubber Deadfront Construction
Specially designed fuse elements with built-in
low and high current interrupting capability
Current-limiting protection. Fault clearing occurs
in less than one half cycle
Modular construction with a center replaceable fuse
section and interchangeable end fittings
bENEFIT/DESCRIPTION
Fully sealed and submersible
Light weight
Insulate, shield and eliminate exposed live parts
Full-Range fault current protection through 50kA
Limits the system available fault current and dramatically
reduces stresses on equipment
Allow elbow connection or direct attachment
to equipment mounted bushings
Flexibility of installation on junctions, transformers,
cable runs, taps
Suitable for padmount, subsurface or vault installations
Accommodate a wide variety of mounting arrangements
Compact
304 stainless steel brackets and hold down straps available
1
Thomas & Betts Corporation 8155 T&B Boulevard Memphis TN 38125 800.888.0211 www.tnb.com
PG-PC-0506
Molded Current-Limiting Fuse
CERTIFIED TESTS & PERFORMANCE
RATINGS
System Voltage Class (kV)
Rated Maximum Fuse Voltage (kV)
Frequency (Hz)
BIL Impulse Withstand (kV)
One Minute AC Withstand (kV)
Fifteen Minute DC Withstand (kV)
Corona Extinction (kV)
Symmetrical Interrupting Capability (Amp)
Current Rating (Amp)
5
5.5
50/60
60
34
53
11
50,000
80-180
15
10*
50/60
95
34
53
11
50,000
6-115
25/28*
17.28*
50/60
125/140
40-45
78
19/21.5
50,000
6-100
35
23
50/60
150
50
103
26
50,000
6-50
Elastimold
®
Molded Current-Limiting
Fuses have been designed and tested
per applicable portions of IEEE, ANSI,
NEMA and other industry standards
including:
ANSI C7.40
Standard for Current-
Limiting Fuse Service Conditions.
ANSI C7.41
Standard for Current-
Limiting Fuse Design and Testing.
ANSI C7.47
Standard for Current-
APPLICATION INFORMATION
Construction: Submersible, non-venting, deadfront, corrosion resistant.
Fuses
Ambient Temperature Range:– 30 to +65 degrees centigrade for 6-50 Amp fuses;
– 30 to +40 degrees centigrade for >50 Amp fuses.
* These maximum design voltages apply to fuses rated between 6-50 Amp; for
fuses with higher amperage rating the maximum design voltage is 8.3 kV for
15 kV systems and 15.5 kV for 25/28 kV systems.
Limiting Fuse Ratings and
Specifications.
ANSI/IEEE 86
Standard for Separable
Connectors & Bushing Interfaces.
Interchangeable
Molded Rubber End
Fittings
Replaceable Molded Rubber
Current-Limiting Fuse
Assembled Fuse Unit
Assembled Fuse Unit with
Optional Wall Mounting
Bracket
PG-PC-0506
Thomas & Betts Corporation 8155 T&B Boulevard Memphis TN 38125 800.888.0211 www.tnb.com
1
Molded Current-Limiting Fuse
ELECTRICAL ChARACTERISTICS OF ENCAPSULATED FUSES USED IN MCLF
Fuse
Voltage
Rating
(kV)
Current
Rating
(A)
80
100
125
150
180
10
20
30
40
50
65
80
100
115
10
20
30
40
50
65
80
100
10
20
30
40
50
M05CLF080
M05CLF100
M05CLF125
M05CLF150
M05CLF180
M15CLF010
M15CLF020
M15CLF030
M15CLF040
M15CLF050
M15CLF065
M15CLF080
M15CLF100
M15CLF115
M25CLF010
M25CLF020
M25CLF030
M25CLF040
M25CLF050
M25CLF065
M25CLF080
M25CLF100
M35CLF010
M35CLF020
M35CLF030
M35CLF040
M35CLF050
Fuse
Catalog
Number
Rated
Maximum
Voltage
(kV)
Maximum
Continuous Current
25
o
C
86
108
137
159
185
14
23
35
43
50
73
87
106
120
14
23
35
43
47
68
88
100
14
23
35
41
47
40
o
C
84
105
133
154
180
13
22
33
41
47
71
84
103
116
13
22
33
41
45
66
85
100
13
22
33
40
46
Peak Arc
Voltage
(kV)
(3)
15
15
15
15
15
28
26
26
26
26
25
25
25
25
46
45
45
45
45
40
40
40
61
60
60
60
60
Minimum
2
Melt l t
(AMP -SEC)
22,100
56,700
109,200
176,000
259,000
800
1,620
5,250
8,700
12,800
25,200
47,000
78,300
115,150
800
1,620
5,250
8,700
12,800
25,200
54,400
80,000
800
1,620
5,250
8,700
12,800
2
Maximum
2
Total l t
(2)
2
(AMP -SEC)
110,000
280,000
530,000
860,000
1,270,000
4,000
11,000
30,000
50,000
70,000
100,000
185,000
330,000
480,000
3,700
10,000
30,000
50,000
70,000
110,000
255,000
380,000
4,800
13,000
38,000
61,000
82,000
5.5
5.5
Fuses
10.0
8.3
8.3
17.2
15.5
15.5
23.0
23.0
NOTES:
1. Designs have a 50,000 Amps rms. Symmetrical Rating.
2
2
2. Maximum total l t values are reduced for currents below 50,000A. For example, at 10,000A, l t values are approximately 15% less
than the published values.
3. Peak arc voltages quoted are for 50,000A currents at the rated maximum voltage listed. Reduced currents and voltages will
reduce the peak arc voltage. Consult the factory for further information.
14
Thomas & Betts Corporation 8155 T&B Boulevard Memphis TN 38125 800.888.0211 www.tnb.com
PG-PC-0506
Molded Current-Limiting Fuse
FUSE ORDERING INFORMATION
To completely specify and order a Molded Current-Limiting Fuse:
1. Select the Fuse Catalog Number
from Table 1 based on the amperage
and system voltage class. This
table is also used to order spare or
replacement fuses.
2. From Table 2 select a suffix for the
Model Number based on the required
fuse end fittings. If end fittings are
to be ordered and shipped separately
from the fuse, use Table 4.
TAbLE 1 – FUSE CATALOG NUMbERS
Amperage Rating
10
20
30
40
50
65
80
100
125/115
150
180
5kV
Catalog No.
–
–
–
–
–
–
M05CLF080
M05CLF100
M05CLF125
M05CLF150
M05CLF180
8.7/15kV GRD-Y*
Catalog No.
M15CLF010
M15CLF020
M15CLF030
M15CLF040
M15CLF050
M15CLF065
M15CLF080
M15CLF100
M15CLF115
–
–
15/25kV GRD-Y
Catalog No.
M25CLF010
M25CLF020
M25CLF030
M25CLF040
M25CLF050
M25CLF065
M25CLF080
M25CLF100
–
–
–
†
3. Select Mounting Options (if
required) from Table 3.
EXAMPLE
:
To order a fuse for application in a
25kV system (17.2 line-to-ground),
rated 50 Amp with factory assembled
200 Amp Deepwell end fittings and no
mounting provision, specify:
CATALOG NO. M5CLF50-
Fuses
Mounting Options (See Table 3)
20/35kV GRD-Y
Catalog No.
M35CLF010
M35CLF020
M35CLF030
M35CLF040
M35CLF050
–
–
–
–
–
–
NOTE: Fuses rated 6, 8, 12, 18 and 25 Amps are also available by special request.
Contact Factory for additional information.
Grounded Y systems must have enough grounded load to prevent the recovery voltage from exceeding the
fuse’s maximum voltage.
* For 65 Amp and higher, the fuses have a rated maximum voltage of 8.3 kV
† For 65 Amp and higher, the fuses have a rated maximum voltage of 15.5 kV
TAbLE – FUSE END FITTING ARRANGEMENTS
Outline
Model No.
Description
22
200 Amp Deepwell on both ends.
Approx. Weight 30 lbs.
222
200 Amp Deepwell on one end and
two 200 Amp Deepwells on the other end.
Approx. Weight 35 lbs.
PG-PC-0506
Thomas & Betts Corporation 8155 T&B Boulevard Memphis TN 38125 800.888.0211 www.tnb.com
15
Molded Current-Limiting Fuse
TAbLE – FUSE END FITTING ARRANGEMENTS (CONTINUED)
Outline
Model No.
Description
2222
Approx. Weight 40 lbs.
Two 200 Amp Deepwell on both ends.
Fuses
Approx. Weight 30 lbs.
66
600 Amp Bushing on both ends.
6E2
600 Amp Elbow Connector on one
end for attachment to equipment
and a 200 Amp Deepwell on the
other end.
This arrangement is not available
at 20/35kV
Approx. Weight 30 lbs.
6E6
600 Amp Elbow Connector
on one end for attachment to
equipment and a 600 Amp
bushing on the other end.
This arrangements is not
available at 20/35kV
Approx. Weight 30 lbs.
Note: Other models are available such as 26.
16
Thomas & Betts Corporation 8155 T&B Boulevard Memphis TN 38125 800.888.0211 www.tnb.com
PG-PC-0506
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