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Technical Services
Tel: 888.862.3289
H-112
Hi-Tech
®
EX Series Full-Range Current-Limiting Fuses
Power & High Voltage —
Elastimold
®
& Hi-Tech
®
Fuse Products
Fuse Selection
The fuse current rating should be greater than 1.5 x capacitor rated current.This 50% protective
margin accounts for normal overvoltages, harmonics and capacitor tolerances.
Example: The rated current for a single-phase 150kVAR 4.16kV capacitor is 150kVAR/4.16kV
= 36A. Multiplying by the protective margin factor gives 36A x 1.5 = 54A. A 65A fuse should
therefore be used.
To select the proper fuse for a single-phase capacitor application, please refer to the table below.
Single-Phase Capacitor Fuse Recommendations
Fuse Voltage
Rating (kV)
Capacitor
Voltage Rating
(V)
50 kVAR
100 kVAR
150 kVAR
200 kVAR
300 kVAR
400 kVAR
500 kVAR
Fuse Current Rating
2.4–2.77
30
65
100
125
200*
5.5
4.16
18
40
65
75
125
150*
200*
4.8
18
40
50
65
100
125
200*
8.3
6.64
12
25
40
50
80
100
125
7.2
12
25
40
50
65
100
125
7.62–7.96
10
20
30
40
65
80
100
8.32
10
18
30
40
65
80
100
15.5
9.96
8
18
25
30
50
65
80
12.47–14.4
6
12
18
25
40
50
65
23.0
19.9–21.6
6
8
12
18
25
30
40
Note:
All fuses meet “safe zone” tank rupture curves for type EX or equivalent capacitors unless denoted *.