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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
128
Single Phase Application
Boosting
Bucking
Line Voltage
(Available)
95
100 105 208 215 215 220 225
135 240 240 245 250 255
Load Voltage
(Output)
120 114 119 240 244 230 235 240
119 208 225 230 234 239
Catalog Number
T181054
Load
kVA
0.19 0.36 0.37 0.38 0.38 0.72 0.73 0.75
0.42 0.37 0.75 0.77 0.78 0.80
Amps
1.56 3.13 3.13 1.56 1.56 3.13 3.13 3.13
3.54 1.77 3.33 3.33 3.33 3.33
Maximum Size of
Fuse or Breaker
6
6
6
6
6
6
6
6
6
3
6
6
6
6
T181055
Load
kVA
0.38 0.71 0.74 0.75 0.76 1.44 1.47 1.50
0.84 0.74 1.50 1.53 1.56 1.59
Amps
3.13 6.25 6.25 3.13 3.13 6.25 6.25 6.25
7.08 3.54 6.67 6.67 6.67 6.67
Maximum Size of
Fuse or Breaker
10
15
6
6
15
15
15
15
15
6
15
15
15
15
T181056
Load
kVA
0.56 1.07 1.12 1.13 1.14 2.16 2.20 2.25
1.26 1.11 2.25 2.30 2.34 2.39
Amps
4.69 9.38 9.38 4.69 4.69 9.38 9.38 9.38
10.63 5.31 10.00 10.00 10.00 10.00
Maximum Size of
Fuse or Breaker
10
15
15
10
10
15
15
15
15
6
15
15
15
15
T181057
Load
kVA
0.94 1.78 1.86 1.88 1.91 3.59 3.67 3.75
2.11 1.84 3.75 3.83 3.90 3.98
Amps
7.81 15.63 15.63 7.81 7.81 15.63 15.63 15.63 17.71 8.85 16.67 16.67 16.67 16.67
Maximum Size of
Fuse or Breaker
15
25
25
15
15
25
25
25
20
15
20
20
20
20
T181058
Load
kVA
1.88 3.56 3.72 3.75 3.81 7.19 7.34 7.50
4.21 3.68 7.50 7.67 7.80 7.97
Amps
15.63 31.25 31.25 15.63 15.63 31.25 31.25 31.25 35.42 17.71 33.33 33.33 33.33 33.33
Maximum Size of
Fuse or Breaker
25
45
45
25
25
45
45
45
40
20
40
40
40
40
T181059
Load
kVA
2.81 5.34 5.58 5.63 5.72 10.78 11.02 11.25
6.32 5.53 11.25 11.50 11.70 11.95
Amps
23.44 46.88 46.88 23.44 23.44 46.88 46.88 46.88 53.13 26.56 50.00 50.00 50.00 50.00
Maximum Size of
Fuse or Breaker
40
70
70
40
40
70
70
70
60
30
60
60
60
60
T113073
Load
kVA
3.75 7.13 7.44 7.50 7.63 14.38 14.69 15.00
8.43 7.37 15.00 15.33 15.60 15.93
Amps
31.25 62.50 62.50 31.25 31.25 62.50 62.50 62.50 70.83 35.42 66.67 66.67 66.67 66.67
Maximum Size of
Fuse or Breaker
50
90
90
50
50
90
90
90
80
40
80
80
80
80
T113074
Load
kVA
5.63 10.69 11.16 11.25 11.44 21.56 22.03 22.50 12.64 11.05 22.50 23.00 23.40 23.90
Amps
46.90 93.80 93.80 46.90 46.90 93.80 93.80 93.80 106.30 53.10 100.00 100.00 100.00 100.00
Maximum Size of
Fuse or Breaker
80
150 150
70
70
125 125 125
125 60 125 125 125 125
T113075
Load
kVA
7.50 14.25 14.88 15.00 15.25 28.75 29.38 30.00 16.86 14.73 30.00 30.67 31.20 31.87
Amps
62.50 125.00 125.00 62.50 62.50 125.00 125.00 125.00 141.70 70.80 133.30 133.30 133.30 133.30
Maximum Size of
Fuse or Breaker
100 200 200
90
90
175 175 175
175 80 175 175 175 175
T113076
Load
kVA
11.25 21.38 22.31 22.50 22.88 43.13 44.06 45.00 25.29 22.10 45.00 46.00 46.80 47.80
Amps
93.80 187.50 187.50 93.80 93.80 187.50 187.50 187.50 212.50 106.30 200.00 200.00 200.00 200.00
Maximum Size of
Fuse or Breaker
150 300 300 150 150 250 250 250
250 125 250 250 250 250
T113077
Load
kVA
18.75 35.63 37.19 37.50 38.13 71.88 73.44 75.00 42.15 36.83 75.00 76.67 78.00 79.67
Amps
156.30 312.50 312.50 156.30 156.30 312.50 312.50 312.50 354.20 177.10 333.30 333.30 333.30 333.30
Maximum Size of
Fuse or Breaker
250 450 450 225 225 450 450 450
400 200 400 400 400 400
T213078
①
Load
kVA
28.10 53.40 55.80 56.30 57.20 107.80 110.20 112.50 63.20 55.30 112.50 115.00 117.00 119.50
Amps
234.40 468.80 468.80 234.40 234.40 468.80 468.80 468.80 531.30 265.60 500.00 500.00 500.00 500.00
Maximum Size of
Fuse or Breaker
400 700 700 350 350 700 700 700
600 300 600 600 600 600
T213079
①
Load
kVA
37.50 71.30 74.40 75.00 76.30 143.80 146.90 150.00 84.30 73.70 150.00 153.30 156.00 159.30
Amps
312.50 625.00 625.00 312.50 312.50 625.00 625.00 625.00 708.30 354.20 666.70 666.70 666.70 666.70
Maximum Size of
Fuse or Breaker
500 1000 1000 450 450 1000 1000 1000
800 400 800 800 800 800
See Page 136 for Connection Diagrams D C C H H G G G
F
I
E
E
E
E
①
See chart on page 135.
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.