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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
127
Single Phase Application
Boosting
Bucking
Line Voltage
(Available)
95
100 105 110 189 208 215 220
125 132 230 245 250 252
Load Voltage
(Output)
114 120 115 120 208 230 237 242
113 120 208 222 227 240
Catalog Number
T181047
Load
kVA
0.24 0.25 0.48 0.50 0.43 0.48 0.49 0.50
0.52 0.54 0.47 0.50 0.52 1.02
Amps
2.08 2.08 4.17 4.17 2.08 2.08 2.08 2.08
4.60 4.60 2.28 2.28 2.28 4.37
Maximum Size of
Fuse or Breaker
6
6
10
10
6
6
6
6
10
10
6
6
6
10
T181048
Load
kVA
0.47 0.50 0.96 1.01 0.87 0.96 0.99 1.01
1.04 1.08 0.95 1.00 1.04 2.04
Amps
4.17 4.17 8.33 8.33 4.17 4.17 4.17 4.17
9.20 9.20 4.56 4.56 4.58 8.75
Maximum Size of
Fuse or Breaker
10
10
15
15
10
10
10
10
15
15
10
10
10
15
T181049
Load
kVA
0.71 0.75 1.43 1.51 1.30 1.43 1.48 1.51
1.56 1.62 1.42 1.50 1.56 3.00
Amps
6.25 6.25 12.50 12.50 6.25 6.25 6.25 6.25
13.80 13.80 6.86 6.86 6.86 13.10
Maximum Size of
Fuse or Breaker
15
15
20
20
15
15
15
15
20
20
15
15
15
15
T181050
Load
kVA
1.19 1.25 2.40 2.50 2.16 2.39 2.46 2.52
2.60 2.75 2.37 2.50 2.60 5.10
Amps
10.42 10.40 20.80 20.80 10.40 10.40 10.40 10.40 22.80 22.80 11.40 11.40 11.40 21.80
Maximum Size of
Fuse or Breaker
25
25
40
30
15
15
15
15
30
30
15
15
15
30
T181051
Load
kVA
2.37 2.50 4.80 5.00 4.33 4.79 4.93 5.04
5.20 5.40 4.47 5.00 5.20 10.20
Amps
20.83 20.83 41.67 41.67 20.83 20.83 20.83 20.83 46.80 46.80 22.80 22.80 22.80 43.70
Maximum Size of
Fuse or Breaker
35
35
60
60
30
30
30
30
60
60
30
30
30
60
T181052
Load
kVA
3.56 3.75 7.17 7.56 6.50 7.19 7.41 7.56
7.80 8.15 7.10 7.50 7.80 15.30
Amps
31.25 31.25 62.50 62.50 31.25 31.25 31.25 31.25 68.50 69.50 34.40 34.40 34.40 65.50
Maximum Size of
Fuse or Breaker
50
50
90
90
45
45
45
45
80
80
40
40
40
80
T111683
Load
kVA
4.75 5.00 9.58 10.00 8.66 9.58 9.87 10.00 10.40 10.80 9.50 10.00 10.00 20.40
Amps
41.67 41.67 83.31 83.31 41.67 41.67 41.67 41.67 91.50 91.50 45.80 45.80 45.80 87.50
Maximum Size of
Fuse or Breaker
70
70
125 125
60
60
60
60
110 110
60
60
50
110
T111684
Load
kVA
7.12 7.50 14.40 15.10 13.00 14.30 14.80 15.10 15.00 16.20 14.24 15.00 15.60 30.60
Amps
62.50 62.50 125.00 125.00 62.50 62.50 62.50 62.50 138.00 138.00 68.60 68.60 68.60 132.00
Maximum Size of
Fuse or Breaker
100 100 175 175
90
90
90
90
150 175
80
80
80
175
T111685
Load
kVA
9.50 10.00 19.20 20.20 17.30 19.16 19.70 20.10 20.80 21.60 19.00 20.00 20.30 40.80
Amps
83.30 83.30 166.60 166.60 83.30 83.30 83.30 83.30 183.00 183.00 91.60 91.60 91.20 175.00
Maximum Size of
Fuse or Breaker
125 125 250 250 125 125 125 125
225 225 110 110 110 225
T111686
Load
kVA
14.20 15.00 28.80 30.00 26.00 28.70 29.60 30.30 31.20 32.50 28.50 30.00 31.20 61.00
Amps
125.00 125.00 250.00 250.00 125.00 125.00 125.00 125.00 275.00 275.00 136.80 136.80 136.80 263.00
Maximum Size of
Fuse or Breaker
200 200 350 350 175 175 175 175
350 350 175 175 175 350
T111687
Load
kVA
23.70 25.00 47.90 50.00 43.30 47.80 49.30 50.30 52.00 54.00 47.40 50.00 52.00 102.00
Amps
208.00 208.00 416.60 416.60 208.00 208.00 208.00 208.00 457.00 457.00 228.00 228.00 228.00 437.00
Maximum Size of
Fuse or Breaker
350 350 600 600 300 300 300 300
600 600 300 300 300 600
T111688
①
Load
kVA
35.60 37.50 71.90 75.60 65.00 71.80 74.00 75.60 78.00 81.00 71.00 76.00 78.00 153.00
Amps
312.50 312.50 625.00 625.00 312.50 312.50 312.50 312.50 688.00 688.00 344.00 344.00 344.00 655.00
Maximum Size of
Fuse or Breaker
500 500 1000 1000 450 450 450 450
800 800 400 400 400 800
T111689
①
Load
kVA
47.50 50.00 95.80 100.00 86.60 95.80 98.70 101.00 104.00 108.00 95.00 100.00 104.00 204.00
Amps
416.60 416.60 833.30 833.30 416.60 416.60 416.60 416.60 915.00 915.00 458.00 458.00 458.00 875.00
Maximum Size of
Fuse or Breaker
700 700 1200 1200 600 600 600 600
1200 1200 600 600 600 1200
See Page 136 for Connection Diagrams
D D C C H H H H
F
F
I
I
I
E
①
See chart on page 135, for number of leads per termination.
NOTE: 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 suitable for 60 Hz only.
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.