J.H. Larson Company  
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Acme Buck-Boost Transformer Selection Chart
240x480 Volts Primary–24/48 Volts Secondary
 Single Phase BOOSTING BUCKING
Line Voltage (Available)  230 380 416 425 430 435 440 440 450 460 277 480 480 504
Load Voltage (Output)  277 420 457 467 473 457 462 484 472 483 230 436 456 480
Catalog Number Connection
Diagram		 D H H H H G G H G G J I E E
T-1-81061
0.05 KVA		 KVA
Amps
Fuse/Breaker		 0.29
1.04
3		 0.44
1.04
3		 0.48
1.04
3		 0.49
1.04
3		 0.49
1.04
3		 0.95
2.08
6		 0.96
2.08
6		 0.50
1.04
3		 0.98
2.08
6		 1.01
2.08
6		 0.29
1.25
3		 0.50
1.15
3		 1.05
2.29
6		 1.10
2.29
6
T-1-81062
0.10 KVA		 KVA
Amps
Fuse/Breaker		 0.58
2.08
6		 0.87
2.08
6		 0.95
2.08
6		 0.97
2.08
6		 0.99
2.08
6		 1.90
4.17
10		 1.93
4.17
10		 1.01
2.08
6		 1.97
4.17
10		 2.01
4.17
10		 0.58
2.50
6		 1.00
2.29
6		 2.09
4.58
10		 2.20
4.58
10
T-1-81063
0.15 KVA		 KVA
Amps
Fuse/Breaker		 0.87
3.13
10		 1.31
3.13
6		 1.43
3.13
6		 1.46
3.13
6		 1.48
3.13
6		 2.86
6.25
15		 2.89
6.25
15		 1.51
3.13
6		 2.95
6.25
15		 3.02
6.25
15		 0.86
3.75
6		 1.50
3.44
6		 3.14
6.88
15		 3.30
6.88
25
T-1-81064
0.25 KVA		 KVA
Amps
Fuse/Breaker		 1.44
5.21
15		 2.19
5.21
10		 2.38
5.21
10		 2.43
5.21
10		 2.46
5.21
10		 4.76
5.21
15		 4.81
10.42
15		 2.52
5.21
10		 4.92
10.42
15		 5.03
10.42
15		 1.44
6.25
10		 2.50
5.73
10		 5.23
11.46
15		 5.50
11.46
15
T-1-81065
0.50 KVA		 KVA
Amps
Fuse/Breaker		 2.89
10.42
20		 4.38
10.42
15		 4.76
10.42
15		 4.86
10.42
15		 4.93
10.42
15		 9.52
20.83
30		 9.62
20.83
30		 5.04
10.42
15		 9.83
20.83
30		 10.06
20.83
30		 2.88
12.50
15		 5.00
11.46
15		 10.45
22.92
30		 11.00
22.92
30
T-1-81066
0.75 KVA		 KVA
Amps
Fuse/Breaker		 4.33
15.63
25		 6.56
15.63
25		 7.14
15.63
25		 7.30
15.63
25		 7.39
15.63
25		 14.28
31.25
45		 14.44
31.25
45		 7.56
15.63
25		 14.75
31.25
45		 15.09
31.25
45		 4.31
18.75
20		 7.49
17.19
20		 15.68
34.38
45		 16.50
34.38
45
T-1-37920
1.00 KVA		 KVA
Amps
Fuse/Breaker		 5.77
20.83
35		 8.57
20.83
30		 9.52
20.83
30		 9.73
20.83
30		 9.85
20.83
30		 19.04
41.67
60		 19.25
41.67
60		 10.08
20.83
60		 19.67
41.67
60		 20.13
41.67
60		 5.75
25.00
30		 9.99
22.92
30		 20.90
45.83
60		 22.00
45.83
60
T-1-37921
1.50 KVA		 KVA
Amps
Fuse/Breaker		 8.66
31.25
50		 13.13
31.25
50		 14.28
31.25
45		 14.59
31.25
45		 14.78
31.25
45		 28.56
62.50
90		 28.88
62.50
90		 15.13
31.25
45		 29.50
62.50
90		 30.19
62.50
90		 8.63
37.50
40		 14.99
34.38
40		 31.35
68.75
90		 33.00
68.75
90
T-1-37922
2.00 KVA		 KVA
Amps
Fuse/Breaker		 11.54
41.67
70		 17.50
41.67
60		 19.04
41.67
60		 19.46
41.67
60		 19.71
41.67
60		 38.08
83.33
110		 38.50
83.33
110		 20.17
41.67
60		 39.33
83.33
110		 40.25
83.33
110		 11.50
50.00
60		 19.98
45.83
60		 41.80
91.67
110		 44.00
91.67
110
T-1-37923
3.00 KVA		 KVA
Amps
Fuse/Breaker		 17.31
62.50
90		 26.25
62.50
90		 28.56
62.50
90		 29.19
62.50
90		 29.56
62.50
90		 57.13
125.00
175		 57.75
125.00
175		 30.25
62.50
90		 59.00
125.00
175		 60.38
125.00
175		 17.25
75.00
80		 29.98
68.80
80		 62.70
137.50
175		 66.00
137.50
175
T-1-37924
5.00 KVA		 KVA
Amps
Fuse/Breaker		 28.90
104.20
175		 43.80
104.20
150		 47.60
104.20
150		 48.60
104.20
150		 49.30
104.20
150		 95.20
208.33
300		 96.20
208.33
300		 50.40
104.20
150		 98.30
208.33
300		 100.60
208.33
300		 28.80
125.00
150		 50.00
114.60
150		 104.50
229.20
300		 110.00
229.20
300
T-1-43570
7.50 KVA		 KVA
Amps
Fuse/Breaker		 43.30
156.30
250		 65.60
156.30
225		 71.40
156.30
225		 73.00
156.30
225		 73.90
156.30
225		 142.80
312.50
450		 144.40
312.50
450		 75.60
156.30
225		 147.50
312.50
450		 150.90
312.50
450		 43.10
187.50
200		 74.90
171.90
200		 156.80
343.80
450		 165.00
343.80
450
T-1-43571[1]
10.00 KVA		 KVA
Amps
Fuse/Breaker		 57.70
208.30
350		 87.50
208.30
300		 95.20
208.30
300		 97.30
208.30
300		 98.50
208.30
300		 190.40
416.70
600		 192.50
416.70
600		 100.80
156.30
300		 196.70
416.70
600		 201.30
416.70
600		 57.50
250.00
300		 99.90
229.20
300		 209.00
458.30
600		 220.00
458.30
600
Catalog Number Connection
Diagram		 D H H H H G G H G G J I 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 this transformer.


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