Buck-Boost Transformers Selection Charts Selection Charts Buck-Boost TransformersBuck-Boost Transformers Buck-Boost Transformers
SELECTING A BUCK-BOOST TRANSFORMER
You should have the following information before selecting a buck-boost transformer.
Line Voltage — The voltage that you want to buck (decrease) or boost (increase). This can be found by measuring the supply
line voltage with a voltmeter.
Load Voltage — The voltage at which your equipment is designed to operate. This is listed on the nameplate of the load
equipment.
Load kVA or Load Amps — You do not need to know both — one or the other is sufficient for selection purposes. This information usually can be found on the nameplate of the equipment that you want to operate.
Frequency — The supply line frequency must be the same as the frequency of the equipment to be operated —
either 50 or 60 cycles.
Phase — The supply line should be the same as the equipment to be operated — either single or three phase.
Four Step Selection
1. A series of LINE VOLTAGE and LOAD VOLTAGE combinations are listed across the top of each selection chart. Select a
LINE VOLTAGE and LOAD VOLTAGE combination from ANY of the charts that comes closest to matching the LINE VOLTAGE
and LOAD VOLTAGE of your application.
2. Read down the column you have selected until you reach either the LOAD kVA or LOAD AMPS of the equipment you want
to operate. You probably will not find the exact value of LOAD kVA or LOAD AMPS so go to the next higher rating.
3. From this point, read across the column to the far left-hand side and you have found the catalog number of the exact buckboost transformer you need. Refer to the catalog number listing on page 133 and 135 for dimensions.
4. CONNECT the transformer according to the connection diagram specified at the bottom of the column where you selected
YOUR LINE VOLTAGE and LOAD VOLTAGE combination. Connection diagrams are found at the end of this section.
This same connection information is packed with each buck-boost transformer.
126
Single Phase Application Boosting Bucking
Line Voltage (Available)
Load Voltage (Output)
Catalog Number
T181047
T181048
T181049
T181050
T181051
T181052
T111683
T111684
T111685
T111686
T111687
T111688 ①
T111689 ①
See Page 135 for Connection Diagrams D D C C H H H H F F I I I E
① See chart on page 134, for number of leads per termination.
NOTE: Inputs and Outputs may be re versed; 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 134.
Load
Load
Load
Load
Load
Load
Load
Load
Load
Load
Load
Load
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
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
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
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
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
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
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
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
Maximum Size of
Fuse or Breaker
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
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
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
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
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
95 100 105 110 189 208 215 220 125 132 230 245 250 252
114 120 115 120 208 230 237 242 113 120 208 222 227 240
6 6 10 10 6 6 6 6 10 10 6 6 6 10
10 10 15 15 10 10 10 10 15 15 10 10 10 15
15 15 20 20 15 15 15 15 20 20 15 15 15 15
25 25 40 30 15 15 15 15 30 30 15 15 15 30
35 35 60 60 30 30 30 30 60 60 30 30 30 60
50 50 90 90 45 45 45 45 80 80 40 40 40 80
70 70 125 125 60 60 60 60 110 110 60 60 50 110
68.60 68.60 68.60 132.00
100 100 175 175 90 90 90 90 150 175 80 80 80 175
125 125 250 250 125 125 125 125 225 225 110 110 110 225
200 200 350 350 175 175 175 175 350 350 175 175 175 350
350 350 600 600 300 300 300 300 600 600 300 300 300 600
500 500 1000 1000 450 450 450 450 800 800 400 400 400 800
700 700 1200 1200 600 600 600 600 1200 1200 600 600 600 1200
127
Buck-Boost Transformers Selection Charts Selection Charts Buck-Boost Transformers
Single Phase Application Boosting Bucking
Line Voltage (Available)
Load Voltage (Output)
Catalog Number
T181054
T181055
T181056
T181057
T181058
T181059
T113073
T113074
T113075
T113076
T113077
T213078 ①
T213079 ①
See Page 135 for Connection Diagrams D C C H H G G G F I E E E E
① See chart on page 134, for number of leads per termination.
NOTE: Inputs and Outputs may be re versed; 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 134.
Load
Load
Load
Load
Load
Load
Load
Load
Load
Load
Load
Load
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
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
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
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
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
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
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
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
Maximum Size of
Fuse or Breaker
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
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
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
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
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
95 100 105 208 215 215 220 225
120 114 119 240 244 230 235 240
6 6 6 6 6 6 6 6 6 3 6 6 6 6
10 15 6 6 15 15 15 15
10 15 15 10 10 15 15 15 15 6 15 15 15 15
15 25 25 15 15 25 25 25 20 15 20 20 20 20
25 45 45 25 25 45 45 45 40 20 40 40 40 40
40 70 70 40 40 70 70 70 60 30 60 60 60 60
50 90 90 50 50 90 90 90 80 40 80 80 80 80
80 150 150 70 70 125 125 125 125 60 125 125 125 125
100 200 200 90 90 175 175 175 175 80 175 175 175 175
150 300 300 150 150 250 250 250 250 125 250 250 250 250
250 450 450 225 225 450 450 450 400 200 400 400 400 400
400 700 700 350 350 700 700 700 600 300 600 600 600 600
500 1000 1000 450 450 1000 1000 1000 800 400 800 800 800 800
135 240 240 245 250 255
119 208 225 230 234 239
15 6 15 15 15 15
100.00 100.00 100.00 100.00
128
Single Phase Application Boosting Bucking
Line Voltage (Available)
Load Voltage (Output)
Catalog Number
T181061
T181062
T181063
T181064
T181065
T181066
T137920
T137921
T137922
T137923
T137924
T243570①
T243571①
See Page 135 for Connection Diagrams D H H H H G G H G G J I E E
① See chart on page 134, for number of leads per termination.
NOTE: Inputs and Outputs may be re versed; 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 134.
Load
Load
Load
Load
Load
Load
Load
Load
Load
Load
Load
Load
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
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
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
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
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
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
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
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
Maximum Size of
Fuse or Breaker
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
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
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
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
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
230 380 416 425 430 435 440 440 450 460
277 420 457 467 473 457 462 484 472 483
3 3 3 3 3 6 6 3 6 6 3 3 6 6
6 6 6 6 6 10 10 6 10 10 6 6 10 10
10 6 6 6 6 15 15 6 15 15 6 6 15 15
15 10 10 10 10 15 15 10 15 15 10 10 15 15
20 15 15 15 15 30 30 15 30 30 15 15 30 30
25 25 25 25 25 45 45 25 45 45 20 20 45 45
35 30 30 30 30 60 60 30 60 60 30 30 60 60
50 50 45 45 45 90 90 45 90 90 40 40 90 90
70 60 60 60 60 110 110 60 110 110 60 60 110 110
100 90 90 90 90 175 175 90 175 175 80 80 175 175
175 150 150 150 150 300 300 150 300 300 150 150 300 300
250 225 225 225 225 450 450 225 450 450 200 200 450 450
350 300 300 300 300 600 600 300 600 600 300 300 600 600
277 480 480 504
230 436 456 480
37.50 34.38 68.75 68.75
129
Buck-Boost Transformers Selection Charts Selection Charts Buck-Boost Transformers
Three Phase Application Boosting Bucking
189Y
196Y
201Y
Line Voltage (Available)
Load Voltage (Output)
Catalog Number
T181047
T181048
T181049
T181050
T181051
T181052
T111683
T111684
T111685
T111686
T111687
T211688 ①
T211689 ①
Quantity Required
See Page 136 for Connection Diagrams A-A F-F F-F A-A B-B B-B B-B C-C E-E E-E E-E E-E
① See chart on page 134, for number of leads per termination.
130
Load
Load
Load
Load
Load
Load
Load
Load
Load
Load
Load
Load
Load
kVA 1.50 0.84 0.87 1.66 0.75 0.83 0.87 1.58 0.83 0.90 0.92 0.95
Amps 4.17 2.08 2.08 4.17 2.08 2.08 2.08 4.39 2.30 2.29 2.29 2.29
Maximum Size of
Fuse or Breaker
kVA 3.00 1.69 1.73 3.32 1.50 1.66 1.75 3.16 1.66 1.80 1.84 1.91
Amps 8.33 4.17 4.17 8.33 4.17 4.17 4.17 8.77 4.61 4.59 4.58 4.58
Maximum Size of
Fuse or Breaker
kVA 4.50 2.53 2.60 4.98 2.25 2.49 2.62 4.74 2.49 2.71 2.76 2.86
Amps 12.50 6.25 6.25 12.50 6.25 6.25 6.25 13.16 6.91 6.88 6.87 6.88
Maximum Size of
Fuse or Breaker
kVA 7.51 4.22 4.33 8.30 3.75 4.15 4.37 7.90 4.15 4.51 4.60 4.76
Amps 20.83 10.42 10.42 20.83 10.42 10.42 10.42 21.94 11.52 11.47 11.45 11.46
Maximum Size of
Fuse or Breaker
kVA 15.01 8.44 8.66 16.60 7.51 8.30 8.73 15.80 8.30 9.02 9.20 9.53
Amps 41.67 20.83 20.83 41.67 20.83 20.83 20.83 43.87 23.04 22.94 22.90 22.92
Maximum Size of
Fuse or Breaker
kVA 22.52 12.67 12.99 24.90 11.26 12.45 13.10 23.71 12.45 13.53 13.80 14.29
Amps 62.50 31.25 31.25 62.50 31.25 31.25 31.25 65.81 34.56 34.42 34.35 34.38
Maximum Size of
Fuse or Breaker
kVA 30.02 16.89 17.32 33.20 15.01 16.60 17.46 31.61 16.60 18.04 18.40 19.05
Amps 83.33 41.67 41.67 83.33 41.67 41.67 41.67 87.74 46.07 45.89 45.80 45.83
Maximum Size of
Fuse or Breaker
kVA 45.03 25.33 25.98 49.80 22.52 24.90 26.20 47.41 24.90 27.06 27.60 28.58
Amps 125.00 62.50 62.50 125.00 62.50 62.50 62.50 131.61 69.11 68.83 68.70 68.75
Maximum Size of
Fuse or Breaker
kVA 60.04 33.77 34.64 66.40 30.02 33.20 34.93 63.22 33.20 36.08 36.81 38.11
Amps 166.67 83.33 83.33 167.67 83.33 83.33 83.33 175.48 92.15 91.78 91.59 91.67
Maximum Size of
Fuse or Breaker
kVA 90.07 50.66 51.96 99.59 45.03 49.80 52.39 94.83 49.80 54.13 55.21 57.16
Amps 250.00 125.00 125.00 250.00 125.00 125.00 125.00 263.22 138.22 137.67 137.39 137.50
Maximum Size of
Fuse or Breaker
kVA 150.11 84.44 86.60 165.99 75.06 82.99 87.32 158.05 82.99 90.21 92.02 95.26
Amps 416.67 208.33 208.33 416.67 208.33 208.33 208.33 438.70 230.37 229.44 228.99 229.17
Maximum Size of
Fuse or Breaker
kVA 225.17 126.66 129.90 248.98 112.58 124.49 130.99 237.07 124.49 135.32 138.02 142.89
Amps 625.00 312.50 312.50 625.00 312.50 312.50 312.50 658.05 345.55 344.16 343.48 343.75
Maximum Size of
Fuse or Breaker
kVA 300.22 168.87 173.21 331.98 150.11 165.99 174.65 316.10 165.99 180.42 184.03 190.53
Amps 833.33 416.67 416.67 833.33 416.67 416.67 416.67 877.40 460.74 458.88 457.97 458.33
Maximum Size of
Fuse or Breaker
109
113
208 234 240 230 208 230 242
10 6 6 10 6 6 6 10 6 6 6 6
15 10 10 15 10 10 10 15 10 10 10 10
20 15 15 20 15 15 15 20 15 15 15 15
30 20 20 30 15 15 15 30 15 15 15 15
60 35 35 60 30 30 30 60 30 30 30 30
90 50 50 90 45 45 45 80 40 40 40 40
125 70 70 125 60 60 60 110 60 60 60 60
175 100 100 175 90 90 90 175 80 80 80 80
250 125 125 250 125 125 125 225 110 110 110 110
350 200 200 350 175 175 175 350 175 175 175 175
600 350 350 600 300 300 300 600 300 300 300 300
1000 500 500 1000 450 450 450 800 400 400 400 400
1200 700 700 1200 600 600 600 1200 600 600 600 600
3 3 3 3 2 2 2 2 2 2 2 2
116
208Y
120
189 208 220 219 230 250 255 264
208 208 227 232 240
Three Phase Application Boosting Bucking
183Y
Line Voltage (Available)
Load Voltage (Output)
Catalog Number
T181054
T181055
T181056
T181057
T181058
T181059
T113073
T113074
T113075
T113076
T113077
T213078 ①
T213079 ①
Quantity Required
See Page 136
for Connection Diagrams
① See chart on page 134, for number of leads per termination.
Load
Load
Load
Load
Load
Load
Load
Load
Load
Load
Load
Load
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
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
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
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
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
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
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
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
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
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
Maximum Size of
Fuse or Breaker
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
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
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
208Y
106
208 236 208 240 240
6 6 6 3 6 3 6 6 6 3 3
15 15 15 6 15 6 15 15 15 6 6
15 15 15 10 15 10 15 15 15 10 10
25 25 25 15 25 15 20 20 20 15 15
45 45 45 25 45 20 40 40 40 20 20
70 70 70 35 70 30 60 60 60 30 30
90 90 90 45 90 35 80 80 80 40 40
150 150 125 70 125 60 125 125 125 60 60
200 200 175 90 175 70 175 175 175 80 80
300 300 250 150 250 110 250 250 250 125 125
450 450 450 225 450 175 400 400 400 200 200
700 700 700 350 700 300 600 600 600 300 300
1000 1000 1000 450 1000 350 800 800 800 400 400
3 3 2 2 2 2 2 2 2 2 2
A-A A-A G-G B-B G-G D-D C-C C-C C-C E-E E-E
195 208 225 240 245 250 256 265 272
120
208 230 234 240 234 240
187.50 93.75 187.50 93.75 199.73 200.32 200.00 106.17 106.25
131
Buck-Boost Transformers Buck-Boost TransformersBuck-Boost Transformers Selection Charts Selection Charts Buck-Boost Transformers
Three Phase Application
Catalog Number
T181061
T181062
T181063
T181064
T181065
T181066
T137920
T137921
T137922
T137923
T137924
T243570
T243571 ①
Load
Load
Load
Load
Load
Load
Load
Load
Load
Load
Load
Load
Load
Line Voltage (Available)
Load Voltage (Output)
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
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
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
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
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
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
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
Maximum Size of
Fuse or Breaker
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
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
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
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
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
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
399Y
380 430 440 460 460 480 480 440 440 460 460 480 480 500 500
230
480Y
420 473 462 506 483 528 504 400 419 438 418 457 436 455 477
277
3 3 3 6 3 6 3 6 3 6 6 3 6 3 3 6
6 6 6 10 6 10 6 10 6 10 10 6 10 6 6 10
10 6 6 15 6 15 6 15 6 15 15 6 15 6 6 15
15 10 10 15 10 15 10 15 10 15 15 10 15 10 10 15
20 15 15 30 15 30 15 30 15 30 30 15 30 15 15 30
25 25 25 45 25 45 25 45 20 40 40 20 40 20 20 40
35 30 30 60 30 60 30 60 30 60 60 30 60 30 30 60
50 45 45 90 45 90 45 90 40 80 80 40 80 40 40 80
70 60 60 110 60 110 60 110 60 110 110 60 110 60 60 110
100 90 90 175 90 175 90 175 80 175 175 80 175 80 80 175
175 150 150 300 150 300 150 300 150 300 300 150 300 150 150 300
250 225 225 450 225 450 225 450 200 400 400 200 400 200 200 400
350 300 300 600 300 600 300 600 300 600 600 300 600 300 300 600
Boosting Bucking
22.88 43.68
Quantity Required 3 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2
See Page 136
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 134, for number of leads per termination.
NOTE: (1) Inputs and Outputs may be re versed; 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.
132
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