J.H. Larson Company  
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Acme Buck-Boost Transformer Selection Chart
120x240 Volts Primary–12/24 Volts Secondary
 Three Phase BOOSTING BUCKING
Line Voltage (Available)  189Y
109		 196Y
113		 201Y
116		 208Y
120		 189 208 220 229 230 250 255 265
Load Voltage (Output)  208 234 240 230 208 230 242 208 208 227 232 240
Quanity Required       3 3 3 3 2 2 2 2 2 2 2 2
Catalog Number Connection
Diagram		 A–A F–F F–F A–A B–B B–B B–B C–C E–E E–E E–E E–E
T-1-81047
0.05 KVA		 KVA
Amps
Fuse/Breaker		 1.50
4.17
10		 0.84
2.08
6		 0.87
2.08
6		 1.66
4.17
10		 0.75
2.08
6		 0.83
2.08
6		 0.87
2.08
6		 1.58
4.39
10		 0.83
2.30
6		 0.90
2.29
6		 0.92
2.29
6		 0.95
2.29
6
T-1-81048
0.10 KVA		 KVA
Amps
Fuse/Breaker		 3.00
8.33
15		 1.69
4.17
10		 1.73
4.17
10		 3.32
8.33
15		 1.50
4.17
10		 1.66
4.17
10		 1.75
4.17
10		 3.16
8.77
15		 1.66
4.61
10		 1.80
4.59
10		 1.84
4.58
10		 1.91
4.58
10
T-1-81049
0.15 KVA		 KVA
Amps
Fuse/Breaker		 4.50
12.50
20		 2.53
6.25
15		 2.60
6.25
15		 4.98
6.25
20		 2.25
6.25
15		 2.49
6.25
15		 2.62
6.25
15		 4.74
13.16
20		 2.49
6.91
15		 2.71
6.88
15		 2.76
6.87
15		 2.86
6.88
15
T-1-81050
0.25 KVA		 KVA
Amps
Fuse/Breaker		 7.51
20.83
30		 4.22
10.42
20		 4.33
10.42
20		 8.30
20.83
30		 3.75
10.42
15		 4.15
10.42
15		 4.37
10.42
15		 7.90
21.94
30		 4.15
11.52
15		 4.51
11.47
15		 4.60
11.45
15		 4.76
11.46
15
T-1-81051
0.50 KVA		 KVA
Amps
Fuse/Breaker		 15.01
41.67
60		 8.44
20.83
35		 8.66
20.83
35		 16.60
41.67
60		 7.51
20.83
30		 8.30
20.83
30		 8.73
20.83
30		 15.80
43.87
60		 8.30
23.04
30		 9.02
22.94
30		 9.20
22.90
30		 9.53
22.92
30
T-1-81052
0.75 KVA		 KVA
Amps
Fuse/Breaker		 22.52
62.50
90		 12.67
31.25
50		 12.99
31.25
50		 24.90
62.50
90		 11.26
31.25
45		 12.45
31.25
45		 13.10
31.25
45		 23.71
65.81
80		 12.45
34.56
40		 13.53
34.42
40		 13.80
34.45
4		 14.29
34.38
40
T-1-11683
1.00 KVA		 KVA
Amps
Fuse/Breaker		 30.02
83.31
125		 16.89
41.67
70		 17.32
41.67
70		 33.20
83.31
125		 15.01
41.67
60		 16.60
41.67
60		 17.46
41.67
60		 31.61
87.74
110		 16.60
46.07
60		 18.04
45.89
60		 18.40
45.80
60		 19.05
45.83
60
T-1-11684
1.50 KVA		 KVA
Amps
Fuse/Breaker		 45.03
125.00
175		 25.33
62.50
100		 25.98
62.50
100		 49.80
125.00
175		 22.52
62.50
90		 24.90
62.50
90		 26.20
62.50
90		 47.41
131.61
175		 24.90
69.11
80		 27.06
68.83
80		 27.60
68.70
80		 28.58
68.75
80
T-1-11685
2.00 KVA		 KVA
Amps
Fuse/Breaker		 60.04
166.67
250		 33.77
83.33
125		 34.64
83.33
125		 66.40
167.67
250		 30.02
83.33
125		 33.20
83.33
125		 34.93
83.33
125		 63.22
175.48
225		 33.20
92.15
110		 36.08
91.78
110		 36.81
91.59
110		 38.11
91.67
110
T-1-11686
3.00 KVA		 KVA
Amps
Fuse/Breaker		 90.07
250.00
350		 50.66
125.00
200		 51.96
125.00
200		 99.59
250.00
350		 45.03
125.00
175		 49.80
125.00
175		 52.39
125.00
175		 94.83
263.22
350		 49.80
138.22
175		 54.13
137.67
175		 55.21
137.39
175		 57.16
137.50
175
T-1-11687
5.00 KVA		 KVA
Amps
Fuse/Breaker		 150.11
416.67
600		 84.44
208.33
350		 86.60
208.33
350		 165.99
416.67
600		 75.06
208.33
300		 82.99
208.33
300		 87.32
208.33
300		 158.05
438.70
600		 82.99
230.37
300		 90.21
229.44
300		 92.02
228.99
300		 95.26
229.17
300
T-1-11688[1]
7.50 KVA		 KVA
Amps
Fuse/Breaker		 225.17
625.00
1000		 126.66
312.50
500		 129.90
312.50
500		 248.98
625.00
1000		 112.58
312.50
450		 124.49
312.50
450		 130.99
312.50
450		 237.07
658.05
800		 124.49
345.55
400		 135.32
344.16
400		 138.02
343.48
400		 142.89
343.75
400
T-1-11689[1]
10.00 KVA		 KVA
Amps
Fuse/Breaker		 300.22
833.33
1200		 168.87
416.67
700		 173.21
416.67
700		 331.98
833.33
1200		 150.11
416.67
600		 165.99
416.67
600		 174.65
416.67
600		 316.10
877.40
1200		 165.99
460.74
600		 180.42
458.88
600		 184.03
457.97
600		 190.53
458.33
600
Quanity Required       3 3 3 3 2 2 2 2 2 2 2 2
Catalog Number Connection
Diagram		 A–A F–F F–F A–A B–B B–B B–B C–C E–E E–E E–E E–E

Note:   Inputs and outputs may be reversed; KVA remains constant.
All applications in black are suitable for 50/60 Hz.   All applications in red are suitable for 60 Hz. only.
[1]  It is necessary to utilize multiple conductors on the secondary (X1, X2, X3, and X4) terminals of these transformers.

 Selection Charts
 120x240V - 12/24V 1Ø Phase
 120x240V - 16/32V 1Ø Phase
 120x240V - 16/32V 3Ø Phase
 240x480V - 24/48V 1Ø Phase
 240x480V - 24/48V 3Ø Phase
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