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Transformer KVA Ratings

Single Phase Full Load Current
KVA Rating 120V 208V 240V 277V 480V 600V
Amperes
.050 .42 .24 .21 .18 .10 .08
.075 .63 .36 .31 .27 .16 .13
.100 .83 .48 .42 .36 .21 .17
.150 1.3 .72 .63 .54 .31 .25
.250 2.1 1.2 1.0 .90 .52 .42
.500 4.2 2.4 2.1 1.8 1.4 .83
.750 6.3 3.6 3.1 2.7 1.6 1.3
1 8.3 4.8 4.2 3.6 2.1 1.7
1.5 12.5 7.2 6.3 5.4 3.1 2.5
2 16.7 9.6 8.3 7.2 4.2 3.3
3 25.0 14.4 12.5 10.8 6.3 5.0
5 41.7 24.0 20.8 18.1 10.4 8.3
7.5 62.5 36.1 31.3 27.1 15.6 12.5
10 83.3 48.1 41.7 36.1 20.8 16.7
15 125.0 72.1 62.5 54.2 31.3 25.0
25 208.3 120.2 104.2 90.3 52.1 41.7
37.5 312.5 180.3 156.3 135.4 78.1 62.5
50 416.7 240.4 208.3 180.5 104.2 83.3
75 625.0 361.0 313.0 271.0 156.0 125.0
100 833.0 481.0 417.0 361.0 208.0 167.0
167 1392.0 803.0 696.0 603.0 348.0 278.0
200 1667.0 962.0 833.0 722.0 417.0 333.0
250 2083.0 1202.0 1042.0 903.0 521.0 417.0
Single Phase AC Motor HP Amperage
Horse Power 115V 208V 230V 460V 575V Min Tfmr. KVA Std. NEMA KVA Size
1/6 4.4 2.4 2.2 1.1 .9 .53 .750
1/4 5.8 3.2 2.9 1.4 1.2 .70 .750
1/3 7.2 4.0 3.6 1.8 1.4 .87 1.0
1/2 9.8 5.4 4.9 2.5 2.0 1.2 1.5
3/4 13.8 7.6 6.9 3.5 2.8 1.7 2
1 16.0 8.8 8.0 4.0 3.2 1.9 2
1 1/2 20.0 11.0 10.0 5.0 4.0 2.4 3
2 24.0 13.2 12.0 6.0 4.8 2.9 3
3 34.0 18.7 17.0 8.5 6.8 4.1 5
5 56.0 30.8 28.0 14.0 11.2 6.7 7.5
7.5 80.0 44.0 40.0 21.0 16.0 9.6 10
10 100.0 55.0 50.0 26.0 20.0 12.0 15
Three Phase Full Load Current
KVA Rating 208V 240V 480V 600V
Amperes
3 8.3 7.2 3.6 2.9
6 16.7 14.4 7.2 5.8
9 25.0 21.7 10.8 8.7
15 41.6 36.1 18.0 14.4
30 83.3 72.2 36.1 28.9
45 125.0 108.3 54.1 43.3
75 208.2 180.4 90.2 72.2
112.5 312.0 271.0 135.0 108.0
150 416.0 361.0 180.0 144.0
225 625.0 541.0 271.0 217.0
300 833.0 722.0 361.0 289.0
500 1388.0 1203.0 601.0 481.0
Three Phase AC Motor HP Amperage
Horse Power 208V 230V 460V 575V Mini Tfmr. KVA Std. NEMA KVA Size
1/2 2.2 2.0 1.0 0.8 0.9 3.0
3/4 3.1 2.8 1.4 1.1 1.2 3.0
1 4.0 3.6 1.8 1.4 1.5 3.0
1 1/2 5.7 5.2 2.6 2.1 2.1 3.0
2 7.5 6.8 3.4 2.7 2.7 3.0
3 10.7 9.6 4.8 3.9 3.8 6.0
5 16.7 15.2 7.6 6.1 6.3 9.0
7 1/2 24.0 22.0 11.0 9.0 9.2 15.0
10 31.0 28.0 14.0 11.0 11.2 15.0
15 46.0 42.0 21.0 17.0 16.6 30.0
20 59.0 54.0 27.0 22.0 21.6 30.0
25 75.0 68.0 34.0 27.0 26.6 30.0
30 88.0 80.0 40.0 32.0 32.4 45.0
40 114.0 104.0 52.0 41.0 43.2 45.0
50 143.0 130.0 65.0 52.0 52.0 75.0
60 170.0 154.0 77.0 62.0 64.0 75.0
75 211.0 192.0 96.0 77.0 80.0 112.5
100 273.0 248.0 124.0 99.0 103.0 112.5
125 342.0 312.0 156.0 125.0 130.0 150.0
150 396.0 360.0 180.0 144.0 150.0 150.0
200 528.0 480.0 240.0 192.0 200.0 225.0
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