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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
131
Three Phase Application
Boosting
Bucking
Line Voltage
(Available)
183Y
106
208Y
120
195
208
225
240
245
250
256
265
272
Load Voltage
(Output)
208
236
208
240
240
208
230
234
240
234
240
Catalog Number
T181054
Load
kVA
1.13
1.28
1.13
0.63
1.30
0.56
1.33
1.35
1.39
0.72
0.74
Amps
3.13
3.13
3.13
1.56
3.13
1.56
3.33
3.34
3.33
1.77
1.77
Maximum Size of
Fuse or Breaker
6
6
6
3
6
3
6
6
6
3
3
T181055
Load
kVA
2.25
2.55
2.25
1.27
2.60
1.13
2.65
2.71
2.77
1.43
1.47
Amps
6.25
6.25
6.25
3.13
6.25
3.13
6.66
6.68
6.67
3.54
3.54
Maximum Size of
Fuse or Breaker
15
15
15
6
15
6
15
15
15
6
6
T181056
Load
kVA
3.38
3.83
3.38
1.90
3.90
1.69
3.98
4.06
4.16
2.15
2.21
Amps
9.38
9.38
9.38
4.69
9.38
4.69
9.99
10.02 10.00
5.31
5.31
Maximum Size of
Fuse or Breaker
15
15
15
10
15
10
15
15
15
10
10
T181057
Load
kVA
5.63
6.39
5.63
3.17
6.50
2.81
6.63
6.77
6.93
3.59
3.68
Amps
15.63 15.63 15.63 7.81 15.63
7.81
16.64 16.69 16.67
8.85
8.85
Maximum Size of
Fuse or Breaker
25
25
25
15
25
15
20
20
20
15
15
T181058
Load
kVA
11.26 12.77 11.26 6.33 12.99
5.63
13.26 13.53 13.86
7.17
7.36
Amps
31.25 31.25 31.25 15.63 31.25
15.63 33.29 33.39 33.33 17.69 17.71
Maximum Size of
Fuse or Breaker
45
45
45
25
45
20
40
40
40
20
20
T181059
Load
kVA
16.89 19.16 16.89 9.50 19.49
8.44
19.89 20.30 20.78 10.76 11.04
Amps
46.88 46.88 46.88 23.44 46.88
23.44 49.93 50.08 50.00 26.54 26.56
Maximum Size of
Fuse or Breaker
70
70
70
35
70
30
60
60
60
30
30
T113073
Load
kVA
22.52 25.55 22.52 12.67 25.98
11.26 26.52 27.06 27.71 14.34 14.72
Amps
62.50 62.50 62.50 31.25 62.50
31.25 66.58 66.67 66.67 35.39 35.42
Maximum Size of
Fuse or Breaker
90
90
90
45
90
35
80
80
80
40
40
T113074
Load
kVA
33.77 38.32 33.77 19.00 38.97
16.89 39.87 40.59 41.57 21.52 22.08
Amps
93.75 93.75 93.75 46.88 93.75
46.88 99.86 100.16 100.00 53.08 53.13
Maximum Size of
Fuse or Breaker
150
150
125
70
125
60
125
125
125
60
60
T113075
Load
kVA
45.03 51.10 45.03 25.33 51.96
22.52 53.04 54.13 55.43 28.69 29.44
Amps
125.00 125.00 125.00 62.50 125.00
62.50 133.15 133.55 133.33 70.78 70.83
Maximum Size of
Fuse or Breaker
200
200
175
90
175
70
175
175
175
80
80
T113076
Load
kVA
67.55 76.64 67.55 38.00 77.94
33.77 79.57 81.19 83.14 43.03 44.17
Amps
187.50 187.50 187.50 93.75 187.50
93.75 199.73 200.32 200.00 106.17 106.25
Maximum Size of
Fuse or Breaker
300
300
250
150
250
110
250
250
250
125
125
T113077
Load
kVA
112.58 127.74 112.58 63.33 129.90
56.29 132.61 135.32 138.56 71.72 73.50
Amps
312.50 312.50 312.50 156.25 312.50
156.25 332.88 333.87 333.33 176.95 176.80
Maximum Size of
Fuse or Breaker
450
450
450
225
450
175
400
400
400
200
200
T213078
①
Load
kVA
166.87 191.61 168.87 94.99 194.86
84.44 198.92 202.97 207.85 107.58 110.42
Amps
468.75 468.75 468.75 234.38 468.75
234.38 499.32 500.80 500.00 265.42 265.63
Maximum Size of
Fuse or Breaker
700
700
700
350
700
300
600
600
600
300
300
T213079
①
Load
kVA
225.17 255.48 225.17 126.66 259.81
112.58 265.22 270.63 277.13 143.44 147.22
Amps
625.00 625.00 625.00 312.50 625.00
312.50 665.76 667.74 666.67 353.90 354.17
Maximum Size of
Fuse or Breaker
1000 1000 1000
450
1000
350
800
800
800
400
400
Quantity Required
3
3
2
2
2
2
2
2
2
2
2
See Page 136-137
for Connection Diagrams
A-A A-A G-G B-B G-G
D-D C-C C-C C-C E-E
E-E
①
See chart on page 134.