Página 27 - elastimold

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United States
Tel: 901.252.8000
800.816.7809
Fax: 901.252.1354
Technical Services
Tel: 888.862.3289
www.tnb.com
H-87
Hi-Tech
®
OS Series Back-Up Current-Limiting Fuses
Power & High Voltage —
Elastimold
®
& Hi-Tech
®
Fuse Products
Assumed Transformer Impedances Used for Fuses Coordination
Transformer
Size (kVA)
1
Impedances
(%)
3
Impedances
(%)
5
1.90
10
1.90
15
1.90
25
1.90
37.5
1.90
45
1.60
50
1.90
75
1.90
1.60
100
2.00
112.5
1.80
150
2.00
167
2.60
225
3.00
250
4.00
300
3.50
333
5.00
500
5.00
4.00
750 and up
5.75
5.75
Fuse Selection
For a detailed explanation on selecting the appropriate backup current limiting fuse
for a given application, please refer to Hi-Tech Fuses Application Bulletin FS-10.
For a quicker method of selecting the proper Trans-Guard
®
OS Shorty Fuse for applications
involving coordination with Bay-O-Net expulsion fuses and transformers having impedances
equal to or higher than those listed below, refer to the fuse coordination chart
below
and
on
pages H-88–H-90
. These charts include columns that specify OS Shorty Fuses for each
application. More comprehensive charts listing fusing alternatives for transformers having any
impedance can be found at
www.tnb.com/utility
.