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Capacitor expulsion fuse electrical ratings

    Catalog number
       
    Capacitor mounting configuration
    Power prequency interrupting rating (amps
Fuse max voltage rating (kV)
Capacitor voltage rating (kV)
Vertical
Horizontal
Current rating (amps)
Interrupting rating (joules)
Symmetrical
Asymmetrical
8.7
2.4 - 8.32
FN 5B1**
  50
10000
7100
10000
8.7
2.4 - 8.32
FN10B5
FN13B3
50
15000
3600
5000
8.7
2.4 - 8.32
FN20B1
FN19B1
80
15000
3600
5000
15
9.96 - 15.2
FN11B1***
FN14B1*** 
50
15000
3600
5000
23
19.92 - 21.6
FN11B1***
FN14B1***
50
15000
1800
2500
**FN5B1 is the only unit using tin-plated bronze: all others use aluminum
***Both FN11B1 and FB14B1 expulsion fuses are dual rated for 15 and 23 kV

Direct-connected capacitor fuse electrical characteristics

Fuse type
Full-range
Maximum interrupting current
50,000 A rms symmetrical

Direct-connected capacitor fuse recommended current ratings (Amperes)

Single-phase capacitor application recommendation
Capacitor voltage rating
Fuse voltage rating (kV)
50 kVAR
100 kVAR
150 kVAR
200 kVAR
300 kVAR
400 kVAR
500 kVAR
Fuse rating (A)
2400
4.3
35
65
100
130*
200*


2770
35
65
100
130*
200*


4160
18
65
65
75
130*
150*
200*
4800
5.5
        125 (4) 
125 (4)
160 (4)* 
4800
18
40
50
65
130*
130*

6640
8.3
12
25 
40
50
80
100
125 
7200
12
25 
40
50
65
100
125 
7620
12
20
30
40
65
80
100
7960
10
20
30
40
65
80
100
8320
10
18
30
40
65
80
100
9960
15.5
10
18
25
40
50
65
80
12470

12
18
25
40
50
65
13280

12
18
25
40
50
65
13800

12
18
25
40
50
65
14400

12
18
25
40
50
65
19920
23.0


12
18
25
40
40
21600


12
18
25
30
40
1. All fuses meet “safe zone” tank rupture curves for medium voltage, Standard-Duty, Heavy-Duty, and Extreme-Duty capacitors or equal
2. Fuse application based on 150% of capacitor current
3. Fuses do not require derating for environment below 100 °C
4. Use 8.3 kV fuse
5. Asterisk (*) denotes parallel fuse assembly

NXC full-range current-limiting capacitor fusing recommendations

Capacitor or unit voltage rating
Fuse voltage rating (kV)
50 kVar*
100 kVar
150 kVar
200 kVar
300 kVar
400 kVar
2400
8.3
30
65
90**


– 
2770
8.3
25 
65
80**


– 
4160
8.3
18
40
65
65

– 
4800
8.3
18
30
45
65

– 
6640
8.3
18
25 
40
45
65
90**
7200
8.3
18
25 
30
40
65
80** 
7620
8.3
18
18
30
40
65
80** 
7960
8.3
18
18
30
40
65
80** 
8320
15.5
10
18
25
35
50**
70** 
9960
15.5
10
18
25
30
50**
60**
12470
15.5

12
18
25
35
50**
13280
15.5

12
18
25
35
50**
13800
15.5

10
18
25
30
50**
14400
15.5

10
18
25
30
50**
19920
23.0

12
12
18
25
36**
21600
23.0

12
12
18
25
25
*For 50 kVar capacitors, it is difficult to choose reasonably sized fuses which will withstand the I2t outrush. This occurs due to the fact that I2t withstand goes down exponentially with fuse link rating rather than linearly. Consequently, the 50 kVar capacitor fusing recommendations only cover those units with voltages up to 9960 V
**Indicates 2 fuses in parallel