J.H. Larson Company  
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Acme Buck-Boost Transformer Selection Chart
120x240 Volts Primary–12/24 Volts Secondary
 Single Phase BOOSTING BUCKING
Line Voltage (Available)  95 100 105 110 189 208 215 220 125 132 230 245 250 252
Load Voltage (Output)  115 120 116 120 208 229 240 242 114 120 208 223 227 240
Catalog Number Connection
Diagram		 D D C C H H H H F F I I I E
T-1-81047
0.05 KVA		 KVA
Amps
Fuse/Breaker		 0.24
2.08
6		 0.25
2.08
6		 0.48
2.08
10		 0.50
2.08
10		 0.43
2.08
6		 0.48
2.08
6		 0.49
2.08
6		 0.50
2.08
6		 0.52
4.60
10		 0.54
4.60
10		 0.47
2.28
6		 0.50
2.28
6		 0.52
2.28
6		 1.02
4.37
10
T-1-81048
0.10 KVA		 KVA
Amps
Fuse/Breaker		 0.47
4.17
10		 0.50
4.17
10		 0.96
8.33
15		 1.01
8.33
15		 0.87
4.17
10		 0.96
4.17
10		 0.99
4.17
10		 1.01
4.17
10		 1.04
9.20
15		 1.08
9.20
15		 0.95
4.56
10		 1.00
4.56
10		 1.04
4.58
10		 2.04
8.75
15
T-1-81049
0.15 KVA		 KVA
Amps
Fuse/Breaker		 0.71
6.25
15		 0.75
6.25
15		 1.43
12.50
20		 1.51
12.50
20		 1.30
6.25
15		 1.43
6.25
15		 1.48
6.25
15		 1.51
6.25
15		 1.56
13.80
20		 1.62
13.80
20		 1.42
6.86
15		 1.50
6.86
15		 1.56
6.86
15		 3.00
13.10
20
T-1-81050
0.25 KVA		 KVA
Amps
Fuse/Breaker		 1.19
10.42
25		 1.25
10.40
25		 2.40
20.80
40		 2.50
20.80
30		 2.16
10.40
15		 2.39
10.40
15		 2.46
10.40
15		 2.52
10.40
15		 2.60
22.80
30		 2.75
22.80
30		 2.37
11.40
15		 2.50
11.40
15		 2.60
11.40
15		 5.10
21.80
30
T-1-81051
0.50 KVA		 KVA
Amps
Fuse/Breaker		 2.37
20.83
35		 2.50
20.83
35		 4.80
41.67
60		 5.00
41.67
60		 4.33
20.83
30		 4.79
20.83
30		 4.93
20.83
30		 5.04
20.83
30		 5.20
46.80
60		 5.40
46.80
60		 4.47
22.80
30		 5.00
22.80
30		 5.20
22.80
30		 10.20
43.70
60
T-1-81052
0.75 KVA		 KVA
Amps
Fuse/Breaker		 3.56
31.25
50		 3.75
31.25
50		 7.17
62.50
90		 7.56
62.50
90		 6.50
31.25
45		 7.19
31.25
45		 7.41
31.25
45		 7.56
31.25
45		 7.80
68.50
80		 8.15
69.50
80		 7.10
34.40
40		 7.50
34.40
40		 7.80
34.40
40		 15.30
45.50
80
T-1-11683
1.00 KVA		 KVA
Amps
Fuse/Breaker		 4.75
41.67
70		 5.00
41.67
70		 9.58
83.31
125		 10.00
83.31
125		 8.66
41.67
60		 9.58
41.67
60		 9.87
41.67
60		 10.00
41.67
60		 10.40
91.50
110		 10.80
91.50
110		 9.50
45.80
60		 10.00
45.80
60		 10.00
45.80
60		 20.40
87.50
110
T-1-11684
1.50 KVA		 KVA
Amps
Fuse/Breaker		 7.12
62.50
100		 7.50
62.50
100		 14.40
125.00
175		 15.10
125.00
175		 13.00
62.50
90		 14.30
62.50
90		 14.80
62.50
90		 15.10
62.50
90		 15.00
138.00
150		 16.20
138.00
175		 14.24
68.60
80		 15.00
68.60
80		 15.60
68.60
80		 30.60
132.00
175
T-1-11685
2.00 KVA		 KVA
Amps
Fuse/Breaker		 9.50
83.30
125		 10.00
83.30
125		 19.20
166.60
250		 20.20
166.60
250		 17.30
83.30
125		 19.16
83.30
125		 19.70
83.30
125		 20.10
83.30
125		 20.80
183.00
225		 21.60
183.00
225		 19.00
91.60
110		 20.00
91.60
110		 20.30
91.20
110		 40.80
175.00
225
T-1-11686
3.00 KVA		 KVA
Amps
Fuse/Breaker		 14.20
125.00
200		 15.00
125.00
200		 28.80
250.00
350/td> 		30.00
250.00
350		 26.00
125.00
175		 28.70
125.00
175		 29.60
125.00
175		 30.30
125.00
175		 31.20
275.00
350		 32.50
275.00
350		 28.50
136.80
175		 30.00
136.80
175		 31.20
136.80
175		 61.00
263.00
350
T-1-11687
5.00 KVA		 KVA
Amps
Fuse/Breaker		 23.70
208.00
350		 25.00
208.00
350		 47.90
416.60
600		 50.00
416.60
600		 43.30
208.00
300		 47.80
208.00
300		 49.30
208.00
300		 50.30
208.00
300		 52.00
457.00
600		 54.00
457.00
600		 47.40
228.00
300		 50.00
228.00
300		 52.00
228.00
300		 102.00
437.00
600
T-1-11688[1]
7.50 KVA		 KVA
Amps
Fuse/Breaker		 35.60
416.60
500		 37.50
416.60
500		 71.90
833.30
1000		 75.60
833.30
1000		 65.00
416.60
450		 71.80
416.60
450		 74.00
416.60
450		 75.60
416.60
450		 78.00
915.00
800		 81.00
915.00
800		 71.00
458.00
400		 76.00
458.00
400		 78.00
458.00
400		 153.00
875.00
800
T-1-11689[1]
10.00 KVA		 KVA
Amps
Fuse/Breaker		 47.50
416.60
700		 50.00
416.60
700		 95.80
833.30
1200		 100.00
833.30
1200		 86.60
416.60
600		 95.80
416.60
600		 98.70
416.60
600		 101.00
416.60
600		 104.00
915.00
1200		 108.00
915.00
1200		 95.00
458.00
600		 100.00
458.00
600		 104.00
458.00
600		 204.00
875.00
1200
Catalog Number Connection
Diagram		 D D C C H H H H F F I I I 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 3Ø 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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