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United States
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Fax: 901.252.1354
Technical Services
Tel: 888.862.3289
H-94
Hi-Tech
®
EXT Series Back-Up Current-Limiting Fuses
Power & High Voltage —
Elastimold
®
& Hi-Tech
®
Fuse Products
Electrical Characteristics of Trans-Guard
®
EXT Current-Limiting Backup Fuse
Nominal
Voltage
Rating (kV)
Current
Rating
Rated Maximum
Interrupting
Current (kA)
Rated
Maximum Voltage
(kV)
Maximum
System Voltage
(kV)
Peak
Arc Voltage
(kV)
Minimum Melt
I2t
(A2sec)
Maximum
Total I2t
(A2sec)
8.3
12K
50
8.3
14.4
26
2,700
8,000
25K
26
11,000
29,000
40K
25
26,000
72,000
65K
22
67,000
230,000
80K
22
156,000
580,000
100K
24
218,000
850,000
15.5
12K
44
17.2
27.6
47
2,700
9,000
25K
49
11,000
34,000
40K
47
26,000
85,000
65K
50
15.5
24.9
44
67,000
230,000
80K
44
156,000
580,000
100K
46
204,000
730,000
23.0
12K
31
23.0
34.5
62
2,700
10,000
25K
60
11,000
37,000
40K
62
26,000
88,000
65K
50
65
67,000
220,000
80K
63
123,000
360,000
Trans-Guard
®
EXT Current-Limiting Backup Fuse/Expulsion Fuse Link Coordination
Trans-Guard EXT
Fuse Rating
Coordinates with links up through
Type K
Type T
Type N
Type S
Type H
Type D
Type X
Type QA
Type KS
12K
12
8
20
5
8
3
2.5
15
3
25K
25
15
30
7
8
20
10
30
7
40K
40
20
50
15
8
20
15
50
15
65K
65
30
60
25
8
20
15
75
15
80K
80
50
85
40
8
20
15
100
15
100K
100
65
85
50
8
20
15
125
15
Voltage Selection
— Refer to first table below. Each Trans-Guard
®
EXT Current-Limiting Backup Fuse
is suitable for use in both single-phase and three-phase applications where the system voltage does
not exceed the Maximum System Voltage listed. For single-phase applications on delta systems,
one fuse is needed in each line.
Current-Rating Selection
— Refer to second table below. Each Trans-Guard
®
EXT Current-Limiting
Backup Fuse will coordinate with any link having a rating no greater than that listed. For types of links
not listed in this table, please contact Thomas & Betts for assistance.
Hardware Selection
— Many different hardware options are available. Some options vary depending
on the size of the Trans-Guard
®
EXT Current-Limiting Backup Fuse required.