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Technical Services
Tel: 888.862.3289
www.tnb.com
H-107
Hi-Tech
®
SX Series Full-Range Current-Limiting Fuses
Power & High Voltage —
Elastimold
®
& Hi-Tech
®
Fuse Products
Recommended Trans-Guard
®
SX for Switchgear: Protecting GndY-GndY* Connected Transformers with Less than 50% Delta
Connected Secondary Load (mounted in a wet-well fuseholder with a max. oil temp. of 60° C)
Fuse Voltage
Recommended Fuse Current Ratings (Amperes)
(5.5kV) 8.3kV
15.5kV
23kV
3-Phase
Transformer
kVA
Transformer 3-Phase Voltage Rating (kV) Phase-to-Phase
2.4
4.16
4.8
7.2–7.96
8.32
12.47
13.2–14.4
20.8
22.9–24.9
34.5
A B A B A B A B A B A B A B A B A B A B
15
10
a
5
5
5a
5
a
5
a
5
a
5
a
5
a
10
a
22.5
12
10
a
10
a
5
5
a
5
a
5
a
5
a
5
a
10
a
30
15
10
10
a
10
a
5
5
a
5
a
5
a
5
a
10
a
45
20
b
25
15
12
10
10
a
5
5
5
a
5
a
10
a
75
30 40 20
b
25
20
12
12
10
a
10
a
5
5
10
a
100
40 50 25 30 25
b
30
20
15
12
a
10
a
10
a
10
a
10
a
112.5
40 65 30
b
40 25 30
20
20
a
12
12
a
10
a
10
a
10
a
150
65 75 40
b
50 30 40 25
b
30 20
b
25
15
15
10
10
a
10
a
200
75 (100)
50 65 40 50 30 40 25 30
20
20
12
12
10
a
225
75 (100)
50 75 40 65 30 40 30
b
40 20
b
25
20
15
12
10
a
300
(150)
b
(175)
65 (100)
65 75 40 50 40
b
50 25 30 25 30
20
20
a
12
500
(175)
(250) (150)
b
(175)
(100)
(150)
65 (100)
50 75 40 50 40
b
50 25 30 25
b
30
20
750
(250)
(150)
(225)
(150)
(225)
(100)
(150)
75 (100)
50 75 50 65 40
b
50 40
b
50 25
b
30
1000
(225)
(175)
(250)
(150)
(175) (150)
b
(175)
75 90 65 90
d
50 65 40 50 30 40
1500
(250)c
(250)
(175)
(250)
(150)
(225)
100 150 100
d
150
d
65 90 65 75 40 50
2000
(225)
(225)
150
150
d
75 100 75 90 50
2500
(250)
c
(250)
160
150
d
100 150 90 150 65
3000
160
c
150
100 150
* Phase-to-Ground rated fuses are commonly used for GndY/GndY connected transformers having no more than 50% Delta connected secondary load.
Notes:
1. Column A = 140–200% of transformer rating and Column B = 200–300% of transformer rating.
2. Recommended fuses meet inrush criteria of 12 times transformer full load current for .1 second and 25 times transformer full load current for .01 second.
Fuses also meet cold load pickup criteria of 6 times transformer full load current for 1 second and 3 times transformer full load current for 10 seconds.
3. Ratings in parentheses are 5.5kV rated fuses.
a Fuse allows more than 300% of transformer rating.
b Fuse allows more than 200% of transformer rating.
c Fuse allows at least 125% of transformer rating.
d 15.5kV fuse must be used for voltages over 8.32kV for delta configurations or 13.8kV GndY/8.32kV.