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Selection Charts
B u c k - B o o s t T r a n s f o r m e r s
129
Single Phase Application
Boosting
Bucking
Line Voltage
(Available)
230 380 416 425 430 435 440 440 450 460
277 480 480 504
Load Voltage
(Output)
277 420 457 467 473 457 462 484 472 483
230 436 456 480
Catalog Number
T181061
Load
kVA
0.29 0.44 0.48 0.49 0.49 0.95 0.96 0.50 0.98 1.01
0.29 0.50 1.05 1.10
Amps
1.04 1.04 1.04 1.04 1.04 2.08 2.08 1.04 2.08 2.08
1.25 1.15 2.29 2.29
Maximum Size of
Fuse or Breaker
3
3
3
3
3
6
6
3
6
6
3
3
6
6
T181062
Load
kVA
0.58 0.87 0.95 0.97 0.99 1.90 1.93 1.01 1.97 2.01
0.58 1.00 2.09 2.20
Amps
2.08 2.08 2.08 2.08 2.08 4.17 4.17 2.08 4.17 4.17
2.50 2.29 4.58 4.58
Maximum Size of
Fuse or Breaker
6
6
6
6
6
10
10
6
10
10
6
6
10
10
T181063
Load
kVA
0.87 1.31 1.43 1.46 1.48 2.86 2.89 1.51 2.95 3.02
0.86 1.50 3.14 3.30
Amps
3.13 3.13 3.13 3.13 3.13 6.25 6.25 3.13 6.25 6.25
3.75 3.44 6.88 6.88
Maximum Size of
Fuse or Breaker
10
6
6
6
6
15
15
6
15
15
6
6
15
15
T181064
Load
kVA
1.44 2.19 2.38 2.43 2.46 4.76 4.81 2.52 4.92 5.03
1.44 2.50 5.23 5.50
Amps
5.21 5.21 5.21 5.21 5.21 5.21 10.42 5.21 10.42 10.42
6.25 5.73 11.46 11.46
Maximum Size of
Fuse or Breaker
15
10
10
10
10
15
15
10
15
15
10
10
15
15
T181065
Load
kVA
2.89 4.38 4.76 4.86 4.93 9.52 9.62 5.04 9.83 10.06
2.88 5.00 10.45 11.00
Amps
10.42 10.42 10.42 10.42 10.42 20.83 20.83 10.42 20.83 20.83 12.50 11.46 22.92 22.92
Maximum Size of
Fuse or Breaker
20
15
15
15
15
30
30
15
30
30
15
15
30
30
T181066
Load
kVA
4.33 6.56 7.14 7.30 7.39 14.28 14.44 7.56 14.75 15.09
4.31 7.49 15.68 16.50
Amps
15.63 15.63 15.63 15.63 15.63 31.25 31.25 15.63 31.25 31.25 18.75 17.19 34.38 34.38
Maximum Size of
Fuse or Breaker
25
25
25
25
25
45
45
25
45
45
20
20
45
45
T137920
Load
kVA
5.77 8.57 9.52 9.73 9.85 19.04 19.25 10.08 19.67 20.13
5.75 9.99 20.90 22.00
Amps
20.83 20.83 20.83 20.83 20.83 41.67 41.67 20.83 41.67 41.67 25.00 22.92 45.83 45.83
Maximum Size of
Fuse or Breaker
35
30
30
30
30
60
60
30
60
60
30
30
60
60
T137921
Load
kVA
8.66 13.13 14.28 14.59 14.78 28.56 28.88 15.13 29.50 30.19
8.63 14.99 31.35 33.00
Amps
31.25 31.25 31.25 31.25 31.25 62.50 62.50 31.25 62.50 62.50 37.50 34.38 68.75 68.75
Maximum Size of
Fuse or Breaker
50
50
45
45
45
90
90
45
90
90
40
40
90
90
T137922
Load
kVA
11.54 17.50 19.04 19.46 19.71 38.08 38.50 20.17 39.33 40.25 11.50 19.98 41.80 44.00
Amps
41.67 41.67 41.67 41.67 41.67 83.33 83.33 41.67 83.33 83.33 50.00 45.83 91.67 91.67
Maximum Size of
Fuse or Breaker
70
60
60
60
60
110 110
60
110 110
60
60 110 110
T137923
Load
kVA
17.31 26.25 28.56 29.19 29.56 57.13 57.75 30.25 59.00 60.38 17.25 29.98 62.70 66.00
Amps
62.50 62.50 62.50 62.50 62.50 125.00 125.00 62.50 125.00 125.00 75.00 68.80 137.50 137.50
Maximum Size of
Fuse or Breaker
100
90
90
90
90
175 175
90
175 175
80
80 175 175
T137924
Load
kVA
28.90 43.80 47.60 48.60 49.30 95.20 96.20 50.40 98.30 100.60 28.80 50.00 104.50 110.00
Amps
104.20 104.20 104.20 104.20 104.20 208.30 208.30 104.20 208.30 208.30 125.00 114.60 229.20 229.20
Maximum Size of
Fuse or Breaker
175 150 150 150 150 300 300 150 300 300
150 150 300 300
T243570
①
Load
kVA
43.30 65.60 71.40 73.00 73.90 142.80 144.40 75.60 147.50 150.90 43.10 74.90 156.80 165.00
Amps
156.30 156.30 156.30 156.30 156.30 312.50 312.50 156.30 312.50 312.50 187.50 171.90 343.80 343.80
Maximum Size of
Fuse or Breaker
250 225 225 225 225 450 450 225 450 450
200 200 450 450
T243571
①
Load
kVA
57.70 87.50 95.20 97.30 98.50 190.40 192.50 100.80 196.70 201.30 57.50 99.90 209.00 220.00
Amps
208.30 208.30 208.30 208.30 208.30 416.70 416.70 208.30 416.70 416.70 250.00 229.20 458.30 458.30
Maximum Size of
Fuse or Breaker
350 300 300 300 300 600 600 300 600 600
300 300 600 600
See Page 136 for Connection Diagrams
D H H H H G G H G G
J
I
E
E
①
See chart on page 135.
NOTE: InputsandOutputsmaybereversed;kVAcapacityremainsconstant.Allapplicationsabovebold face linearesuitable for 50/60Hz.Allapplicationsbelowbold face linearesuitable for60Hzonly.
With larger kVA buck-boost units, it is necessary to utilize multiple conductors on the secondary (X) terminals as shown in the chart on page 135.