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B u c k - B o o s t T r a n s f o r m e r s
Selection Charts
132
Three Phase Application
Boosting
Bucking
Line Voltage
(Available)
399Y
230
380
430 440 460
460
480 480
440 440 460 460 480 480 500
500
Load Voltage
(Output)
480Y
277
420
473 462 506
483
528 504
400 419 438 418 457 436 455
477
Catalog Number
T181061
Load
kVA
0.86 0.76 0.85 1.66 0.91 1.74 0.95 1.82
0.79 1.58 1.66 0.83 1.73 0.86 0.90 1.80
Amps
1.04 1.04 1.04 2.08 1.04 2.08 1.04 2.08
1.14 2.18 2.18 1.14 2.18 1.14 1.14 2.18
Maximum Size of
Fuse or Breaker
3
3
3
6
3
6
3
6
3
6
6
3
6
3
3
6
T181062
Load
kVA
1.73 1.51 1.70 3.33 1.82 3.48 1.90 3.63
1.59 3.17 3.31 1.66 3.46 1.73 1.80 3.61
Amps
2.08 2.08 2.08 4.16 2.08 4.16 2.08 4.16
2.29 4.37 4.37 2.29 4.37 2.29 2.29 4.37
Maximum Size of
Fuse or Breaker
6
6
6
10
6
10
6
10
6
10
10
6
10
6
6
10
T181063
Load
kVA
2.60 2.27 2.56 4.99 2.73 5.22 2.85 5.45
2.38 4.75 4.97 2.48 5.19 2.59 2.70 5.41
Amps
3.12 3.12 3.12 6.24 3.12 6.25 3.12 6.24
3.43 6.55 6.55 3.43 6.55 3.43 3.43 6.55
Maximum Size of
Fuse or Breaker
10
6
6
15
6
15
6
15
6
15
15
6
15
6
6
15
T181064
Load
kVA
4.33 3.78 4.26 8.32 4.56 8.70 4.76 9.08
3.96 7.92 8.28 4.14 8.64 4.32 4.51 9.02
Amps
5.20 5.20 5.20 10.40 5.20 10.40 5.20 10.40
5.72 10.92 10.92 5.72 10.92 5.72 5.72 10.92
Maximum Size of
Fuse or Breaker
15
10
10
15
10
15
10
15
10
15
15
10
15
10
10
15
T181065
Load
kVA
8.60 7.56 8.52 16.64 9.11 17.40 9.51 18.16
7.93 15.85 16.57 8.28 17.29 8.64 9.02 18.04
Amps
10.40 10.40 10.40 20.80 10.40 20.80 10.40 20.80
11.44 21.84 21.84 11.44 21.84 11.44 11.44 21.84
Maximum Size of
Fuse or Breaker
20
15
15
30
15
30
15
30
15
30
30
15
30
15
15
30
T181066
Load
kVA
12.90 11.34 12.77 24.97 13.67 26.10 14.27 27.24
11.89 23.77 24.85 12.42 25.93 12.96 13.52 27.07
Amps
15.60 15.60 15.60 31.20 15.60 31.20 15.60 31.20
17.16 32.76 32.76 17.16 32.76 17.16 17.16 32.76
Maximum Size of
Fuse or Breaker
25
25
25
45
25
45
25
45
20
40
40
20
40
20
20
40
T137920
Load
kVA
17.30 15.12 17.03 33.29 18.23 34.80 19.02 36.31
15.85 31.70 33.14 16.57 34.57 17.28 18.03 36.09
Amps
20.80 20.80 20.80 41.60 20.80 41.60 20.80 41.60
22.88 43.68 43.68 22.88 43.68 22.88 22.88 43.68
Maximum Size of
Fuse or Breaker
35
30
30
60
30
60
30
60
30
60
60
30
60
30
30
60
T137921
Load
kVA
25.90 22.69 25.55 49.93 27.34 52.20 28.53 54.47
23.78 47.55 49.71 24.85 51.86 25.92 27.05 54.13
Amps
31.20 31.20 31.20 62.40 31.20 62.40 31.20 62.40
34.32 65.52 65.52 34.32 65.52 34.32 34.32 65.52
Maximum Size of
Fuse or Breaker
50
45
45
90
45
90
45
90
40
80
80
40
80
40
40
80
T137922
Load
kVA
34.60 30.25 34.07 66.58 36.46 69.60 38.04 72.63
31.70 63.40 66.27 33.13 69.15 34.56 36.06 72.18
Amps
41.60 41.60 41.60 83.20 41.60 83.20 41.60 83.20
45.76 87.36 87.36 45.76 87.36 45.76 45.76 87.36
Maximum Size of
Fuse or Breaker
70
60
60
110
60
110
60
110
60
110 110
60
110
60
60
110
T137923
Load
kVA
52.00 45.45 51.18 100.03 54.69 104.57 57.07 109.12 47.63 95.25 99.57 49.77 103.89 51.92 54.18 108.44
Amps
62.50 62.50 62.50 125.00 62.50 125.00 62.50 125.00 68.75 131.25 131.25 68.75 131.25 68.75 68.75 131.25
Maximum Size of
Fuse or Breaker
100
90
90
175
90
175
90
175
80
175 175
80
175
80
80
175
T137924
Load
kVA
86.10 75.62 85.17 166.44 91.15 174.01 95.11 181.57 79.26 158.50 165.69 82.83 172.87 86.39 90.16 180.44
Amps
104.00 104.00 104.00 208.00 104.00 208.00 104.00 208.00 114.40 218.40 218.40 114.40 218.40 114.40 114.40 218.40
Maximum Size of
Fuse or Breaker
175
150
150
300
150
300
150
300
150 300 300 150 300 150
150
300
T243570
Load
kVA
129.30 113.43 127.75 249.66 136.72 261.01 142.67 272.36 118.89 237.75 248.53 124.24 259.31 129.59 135.23 270.66
Amps
156.00 156.00 156.00 312.00 156.00 312.00 156.00 312.00 171.60 327.60 327.60 171.60 327.60 171.60 171.60 327.60
Maximum Size of
Fuse or Breaker
250
225
225
450
225
450
225
450
200 400 400 200 400 200
200
400
T243571
①
Load
kVA
173.10 151.25 170.33 332.89 182.29 348.02 190.22 363.15 158.52 317.00 331.37 165.65 345.75 172.78 180.31 360.88
Amps
208.00 208.00 208.00 416.00 208.00 416.00 208.00 416.00 228.80 436.80 436.80 228.80 436.80 228.80 228.80 436.80
Maximum Size of
Fuse or Breaker
350
300
300
600
300
600
300
600
300 600 600 300 600 300
300
600
Quantity Required
3
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
See Page 136-137
for Connection Diagrams
F-F B-B B-B G-G B-B G-G B-B G-G E-E C-C C-C E-E C-C E-E E-E C-C
①
See chart on page 135.
NOTE: (1) Inputs and Outputs may be reversed; kVA capacity remains constant. All applications above bold face line are suitable for 50/60 Hz. All applications below bold face line are sui able for
60 Hz only. (2) Connection Diagrams A-A and F-F cannot be reverse connected.