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Industrial Control Transformers
Fuse Protection
41
08/2005
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Primary Fusing to Meet CE
NOTE: Recommended fuse sizes according to testing, EN 60-742.
Secondary Fusing to Meet NEC and CE
NOTES:
• Recommended fuse sizes according to NEC Article 450-3.
• Secondary select protection at 125%, if a standard size rating is not available, go to next higher standard size rating.
• Current rating is less than 9 A, select protection at not more than 167%.
Recommended Fuse Sizes for the PRIMARY (use time delay fuses) for CE Applications
CE VA Rating
Primary Voltage
120 V 208 V 240 V 277 V 380 V 416 V 480 V 600 V
25 1/2 3/102/102/101/101/101/101/10
50 1 6/10 1/2 4/10 3/10 3/10 2/10 2/10
75 1-1/28/106/106/104/104/103/103/10
100 2 1-1/8 1 8/10 6/10 6/10 1/2 4/10
150 3 1-8/10 1-1/2 1-1/4 8/10 8/10 6/10 6/10
160 3-2/10 1-8/10 1-6/10 1-4/10 1 8/10 8/10 6/10
200 4 2-1/4 2 1-8/10 1-1/4 1v1/8 1 8/10
250 3-2/10 3 2-1/2 2 1-6/10 1-1/2 1-1/4 1
300 4 3-1/2 3 2-1/2 1- 8/10 1-8/10 1-1/2 1-1/8
500 6-1/4 4 3-2/10 4-1/2 3-2/10 3 2-1/2 2
630 10 6 5 4-1/2 4-1/2 4-1/2 3-1/2 3
1000 12 8 6-1/4 6 4 4 3-2/10 4
1500 15 12 10 9 6-1/4 6 5 4
2000 20 12 12 12 8 8 6-1/4 5
3000n/a30252015151212
Recommended Fuse Sizes for the SECONDARY to Meet NEC and CE
VA
24 Volts 120 Volts 240 Volts
Secondary
Current Rating
Fuse Rating
Secondary
Current Rating
Fuse Rating
Secondary
Current Rating
Fuse Rating
25 1.04 8/10 0.21 3/10 0.10 15/100
50 2.08 3 0.42 6/10 0.21 3/10
75 3.13 5 0.63 1 0.31 1/2
100 4.17 6 0.83 1-1/4 0.42 6/10
150 6.25 10 1.25 2 0.63 1
200 8.33 12 1.67 2-1/2 0.83 1-1/4
250 10.42 15 2.08 3 1.04 1-3/4
300 12.50 20 2.50 4 1.25 2
350 14.58 20 2.92 5 1.46 2-1/2
500 20.83 30 4.17 7 2.08 3
750 n/a n/a 6.25 10 3.13 5
1000 n/a n/a 8.33 12 4.17 7
1500 n/a n/a 12.50 15 6.25 10
2000 n/a n/a 16.67 20 8.33 12