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I n d u s t r i a l C o n t r o l T r a n s f o r m e r s
PRIMARY FUSE SIZING CHART
RECOMMENDED RATING FOR CURRENT LIMITING CLASS CC FUSES
VA
120 V
208 V
230 V
240 V
277 V
380 V
416 V
440 V
460 V
480 V
550 V
600 V
50
1.2
0.6
0.6
0.6
0.6
0.3
0.3
0.3
0.3
0.3
0.3
0.3
75
1.9
1.0
1.0
1.0
0.8
0.6
0.6
0.6
0.5
0.5
0.4
0.4
100
2.5
1.5
1.3
1.3
1.0
0.8
0.8
0.6
0.6
0.6
0.6
0.5
150
3.8
2.0
2.0
1.9
1.5
1.2
1.2
1.0
1.0
1.0
0.8
0.8
250
3.5
3.5
3.5
3.0
3.0
2.0
1.8
1.8
1.5
1.5
1.4
1.2
300
4.0
4.0
4.0
3.5
3.0
2.5
2.5
2.0
2.0
1.9
1.5
1.5
350
5.0
5.0
4.5
4.0
4.0
2.5
2.5
2.5
2.0
2.0
1.9
1.8
500
7.0
4.0
3.5
3.5
5.5
4.0
3.5
3.5
3.5
3.0
3.0
2.5
750
10.0
6.0
5.5
5.0
4.5
6.0
5.5
5.0
5.0
5.0
4.0
4.0
1000
15.0
8.0
7.0
7.0
6.0
4.5
4.0
3.5
3.5
3.5
5.5
5.0
1500
20.0
12.0
12.0
12.0
10.0
7.0
6.0
6.0
5.5
5.5
5.0
4.5
2000
25.0
12.0
15.0
15.0
12.0
9.0
8.0
8.0
7.5
7.0
6.0
6.0
3000
30.0
20.0
20.0
20.0
15.0
15.0
12.0
12.0
12.0
12.0
10.0
9.0
NOTE: Bold lines indicate changes in the percent of rated current used to calculate fuse sizes in accordance with article 450 of the NEC.
SECONDARY FUSE SIZING CHART
RECOMMENDED RATING FOR CURRENT LIMITING MIDGET FUSES
VA
24 V
85 V
91 V
99 V
100 V
110 V
115 V
120 V
125 V
130 V
50 VA
3.2
0.9
0.9
0.8
0.8
0.7
0.7
0.6
0.6
0.6
75 VA
5.0
1.4
1.2
1.2
1.2
1.0
1.0
1.0
1.0
1.0
100 VA
6.0
1.5
1.5
1.5
1.5
1.5
1.5
1.2
1.2
1.2
150 VA
10.0
2.5
2.5
2.5
2.5
2.0
2.0
2.0
2.0
2.0
250 VA
12.0
4.5
4.5
4.0
4.0
3.5
3.5
3.0
3.0
3.0
300 VA
15.0
5.5
5.5
5.0
5.0
4.5
4.5
4.0
4.0
4.0
350 VA
20.0
6.5
6.0
5.5
5.5
5.0
5.0
4.5
4.5
4.5
500 VA
25.0
9.0
9.0
8.0
8.0
7.0
7.0
6.0
6.0
6.0
750 VA
40.0
12.0
12.0
12.0
12.0
10.0
10.0
10.0
10.0
10.0
1000 VA
50.0
15.0
15.0
12.0
12.0
12.0
12.0
12.0
12.0
12.0
1500 VA
—
25.0
20.0
20.0
20.0
20.0
20.0
15.0
15.0
15.0
2000 VA
—
30.0
30.0
25.0
25.0
25.0
25.0
20.0
20.0
20.0
3000 VA
—
40.0
40.0
40.0
40.0
35.0
35.0
30.0
30.0
30.0