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Buck Boost Transformers

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State-of-the-Art Buck Boost Transformer Sales

What is a buck-boost transformer?

Buck-boost transformers are small single phase transformers designed to reduce (buck) or raise (boost) line voltage from 5-20%. The most common example is boosting 208 volts to 230 volts, usually to operate a 230 volt motor such as an air-conditioner compressor, from a 208 volt supply line.

Buck-boosts are a standard type of single phase distribution transformer, with primary voltages of 120, 240 or 480 volts and secondaries typically of 12, 16, 24, 32 or 48 volts. They are available in sizes ranging from 50 volt amperes to 10 kilo-volt amperes.

Wide Variety of  Power Transformers

We Supply Wide Variety of High Quality Power Transformer Models

Buck-boost transformers are shipped ready to be connected for a number of possible voltage combinations.

Click here for Buck Boost Transformer Pricing: Buck Boost Transformers.

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Call TEMCo's buck boost transformer specialists today at 510-490-2187 today!

Buck-Boost Transformer Selection Chart
120 x 240 Volts Primary–12/24 Volts Secondary
 Single Phase BOOSTING BUCKING
Line Voltage (Available)  96 100 105 109 189 208 218 220 125 132 229 245 250 252
Load Voltage (Output)  115 120 116 120 208 229 240 242 114 120 208 223 227 240
Click part # for info Conn.
Diag.
B B A A D D D D A A D D D C
Federal SB12N.050F
Acme T-1-81047
Hammond QC05ERCB
KVA
Amps
0.24
2.08
0.25
2.08
0.48
4.17
0.50
4.17
0.43
2.08
0.48
2.08
0.50
2.08
0.50
2.08
0.52
4.58
0.55
4.58
0.48
2.29
0.51
2.29
0.52
2.29
1.05
4.38
Federal SB12N.100F
Acme T-1-81048
Hammond QC10ERCB
KVA
Amps
0.48
4.17
0.50
4.17
0.96
8.33
1.00
8.33
0.87
4.17
0.95
4.17
1.00
4.17
1.01
4.17
1.04
9.17
1.10
9.17
0.95
4.58
1.02
4.58
1.04
4.58
2.10
8.75
Federal SB12N.150F
Acme T-1-81049
Hammond QC15ERCB
KVA
Amps
0.72
6.25
0.75
6.25
1.44
12.50
1.50
12.50
1.30
6.25
1.43
6.25
1.50
6.25
1.51
6.25
1.56
13.75
1.65
13.75
1.43
6.87
1.53
6.87
1.56
6.87
3.15
13.13
Federal SB12N.250F
Acme T-1-81050
Hammond QC25ERCB
KVA
Amps
1.20
10.42
1.25
10.42
2.41
20.83
2.50
20.83
2.17
10.42
2.38
10.42
2.50
10.42
2.52
10.42
2.60
22.92
2.75
22.92
2.39
11.46
2.55
11.46
2.60
11.46
5.25
21.88
Federal SB12N.500F
Acme T-1-81051
Hammond QC50ERCB
KVA
Amps
2.40
20.83
2.50
20.83
4.81
41.67
5.00
41.67
4.33
20.83
4.77
20.83
5.00
20.83
5.04
20.83
5.21
45.83
5.50
45.83
4.77
22.92
5.10
22.92
5.21
22.92
10.50
43.75
Federal SB12N.750F
Acme T-1-81052
Hammond QC75ERCB
KVA
Amps
3.60
31.25
3.75
31.25
7.22
62.50
7.38
62.50
6.50
31.25
7.15
31.25
7.49
31.25
7.56
31.25
7.81
68.75
8.25
68.75
7.16
34.37
7.66
34.37
7.81
34.37
15.75
65.63
Federal SB12N1F
Acme T-1-11683
Hammond Q1C0ERCB
KVA
Amps
4.80
41.67
5.00
41.67
9.63
83.33
9.99
83.33
8.66
41.67
9.53
41.67
9.99
41.67
10.08
41.67
10.42
91.67
11.00
91.67
9.54
45.83
10.21
45.83
10.42
45.83
21.00
87.50
Federal SB12N1.5F
Acme T-1-11684
Hammond Q1C5ERCF
KVA
Amps
7.20
62.50
7.50
62.50
14.44
125.00
14.99
125.00
12.99
62.50
14.30
62.50
14.99
62.50
15.13
62.50
15.62
137.50
16.50
137.50
14.31
68.75
15.31
68.75
15.62
68.75
31.50
131.25
Federal SB12N2F
Acme T-1-11685
Hammond Q002ERCF
KVA
Amps
9.60
83.33
10.00
83.33
19.25
166.67
19.98
166.67
17.32
83.33
19.07
83.33
19.98
83.33
20.17
83.33
20.83
183.33
22.00
183.33
19.08
91.67
20.42
91.67
20.83
91.67
42.00
175.00
Federal SB12N3F
Acme T-1-11686
Hammond Q003ERCF
KVA
Amps
14.40
125.00
15.00
125.00
28.88
250.00
29.98
250.00
25.99
125.00
28.60
125.00
29.98
125.00
30.25
125.00
31.25
275.00
33.00
275.00
28.62
137.50
30.62
137.50
31.25
137.50
63.00
262.50
Federal SB12N5F
Acme T-1-11687
Hammond Q005ERCF
KVA
Amps
24.00
208.33
25.00
208.33
48.13
416.67
49.96
416.67
43.31
208.33
47.67
208.33
49.96
208.33
50.42
208.33
52.08
458.33
55.00
458.33
47.71
229.17
51.04
229.17
52.08
229.17
105.00
437.50
Click part # for info Conn.
Diag.
B B A A D D D D A A D D D C
  Output for lower voltage can be found by:  Rated Output Voltage
Rated Input Voltage
x  Input Actual Voltage = Output New Voltage.
 
Output KVA available at reduced voltage can be found by:  Actual Input Voltage
Rated Input Voltage
x  Output KVA = New KVA Rating.
 
Buck-Boost Transformer Selection Chart
120 x 240 Volts Primary–12/24 Volts Secondary
 Three Phase BOOSTING BUCKING
Line Voltage (Available)  189Y
109
195Y
113
200Y
115
208Y
120
416Y
240
416Y
240
189 208 220 218 229 250 255 264
Load Voltage (Output)  208Y
120
234Y
135
240Y
139
229Y
132
458Y
264
437Y
252
208 229 242 208 208 227 232 240
Click part # for info Conn.
Diag.
F E E F J K G G G H G G G G
Federal SB12N.050F
Acme T-1-81047
Hammond QC05ERCB
KVA
Amps
1.50
4.17
0.84
2.08
0.87
2.08
1.65
4.17
1.65
2.08
3.15
4.17
0.75
2.08
0.83
2.08
0.87
2.08
1.57
4.38
0.83
2.29
0.90
2.29
0.92
2.29
0.95
2.29
Federal SB12N.100F
Acme T-1-81048
Hammond QC10ERCB
KVA
Amps
3.00
8.33
1.69
4.17
1.73
4.17
3.30
8.33
3.30
4.17
6.30
8.33
1.50
4.17
1.65
4.17
1.75
4.17
3.15
8.75
1.65
4.58
1.80
4.58
1.84
4.58
1.91
4.58
Federal SB12N.150F
Acme T-1-81049
Hammond QC15ERCB
KVA
Amps
4.50
12.50
2.53
6.25
2.60
6.25
4.95
12.50
4.95
6.25
9.46
12.50
2.25
6.25
2.48
6.25
2.62
6.25
4.72
13.13
2.48
6.87
2.71
6.87
2.76
6.88
2.86
6.88
Federal SB12N.250F
Acme T-1-81050
Hammond QC25ERCB
KVA
Amps
7.50
20.83
4.22
10.42
4.33
1.42
8.26
20.83
8.26
10.42
15.76
10.42
3.75
10.42
4.13
10.42
4.37
10.42
7.87
21.88
4.13
11.46
4.51
11.46
4.60
11.46
4.76
11.46
Federal SB12N.500F
Acme T-1-81051
Hammond QC50ERCB
KVA
Amps
15.00
41.67
8.44
20.83
8.66
20.83
16.51
41.67
16.51
20.83
31.52
241.67
7.50
20.83
8.26
20.83
8.73
20.83
15.73
43.75
8.26
22.92
9.02
22.92
9.20
22.92
9.53
22.92
Federal SB12N.750F
Acme T-1-81052
Hammond QC75ERCB
KVA
Amps
22.51
62.50
12.67
31.25
12.99
31.25
24.77
62.50
24.77
31.25
47.28
62.50
11.25
31.25
12.38
31.25
13.10
31.25
23.60
65.63
12.39
34.37
13.53
34.37
13.80
34.37
14.29
34.38
Federal SB12N1F
Acme T-1-11683
Hammond Q1C0ERCB
KVA
Amps
30.01
83.33
16.89
41.67
17.32
41.67
33.02
83.33
33.02
41.67
63.05
83.33
15.00
41.67
16.51
41.67
17.46
41.67
31.47
87.50
16.53
45.83
18.04
45.83
18.40
45.83
19.05
45.83
Federal SB12N1.5F
Acme T-1-11684
Hammond Q1C5ERCF
KVA
Amps
45.01
125.00
25.33
62.50
25.98
62.50
49.54
125.00
49.54
62.50
94.57
125.00
22.51
62.50
24.77
62.50
26.20
62.50
47.20
131.25
24.79
68.75
27.06
68.75
27.60
68.75
28.58
68.75
Federal SB12N2F
Acme T-1-11685
Hammond Q002ERCF
KVA
Amps
60.02
166.67
33.77
83.33
34.64
83.33
66.05
166.67
66.05
83.33
126.09
166.67
30.01
83.33
33.02
83.33
34.93
83.33
62.93
175.00
33.05
91.67
36.08
91.67
36.81
91.67
38.11
91.67
Federal SB12N3F
Acme T-1-11686
Hammond Q003ERCF
KVA
Amps
90.02
250.00
50.66
125.00
51.96
125.00
99.07
250.00
99.07
125.00
189.14
250.00
45.01
125.00
49.54
125.00
52.39
125.00
94.40
262.50
49.58
137.50
54.13
137.50
55.21
137.50
57.16
137.50
Federal SB12N5F
Acme T-1-11687
Hammond Q005ERCF
KVA
Amps
150.04
416.67
84.44
208.33
86.60
208.33
165.12
416.67
165.12
208.33
315.23
416.67
75.02
208.33
82.56
208.33
87.32
208.33
157.33
437.50
82.63
229.17
90.21
229.17
92.02
229.17
95.26
229.17
No. of Transformers 3 3 3 3 3 3 2 2 2 2 2 2 2 2
Catalog Number Conn.
Diag.
F E E F J K G G G H G G G G
  Output for lower voltage can be found by:  Rated Output Voltage
Rated Input Voltage
x  Input Actual Voltage = Output New Voltage.
 
Output KVA available at reduced voltage can be found by:  Actual Input Voltage
Rated Input Voltage
x  Output KVA = New KVA Rating.
 
Buck-Boost Transformer Selection Chart
120 x 240 Volts Primary–16/32 Volts Secondary
 Single Phase BOOSTING BUCKING
Line Voltage (Available)  95 100 105 208 215 215 220 225 135 240 240 245 250 255
Load Voltage (Output)  120 113 119 236 244 229 235 240 120 212 225 230 234 239
Click part # for info Conn.
Diag.
B A A D D C C C A D C C C C
Federal SB16N.050F
Acme T-1-81054
Hammond QC05ESCB
KVA
Amps
0.19
1.56
0.35
3.13
0.37
3.13
0.37
1.56
0.38
1.56
0.72
3.12
0.73
3.13
0.75
3.12
0.42
3.54
0.38
1.77
0.75
3.33
0.77
3.33
0.78
3.33
0.80
3.33
Federal SB16N.100F
Acme T-1-81055
Hammond QC10ESCB
KVA
Amps
0.38
3.13
0.71
6.25
0.74
6.25
0.74
3.13
0.76
3.13
1.43
6.25
1.47
6.25
1.50
6.25
0.84
7.08
0.75
3.54
1.50
6.67
1.53
6.67
1.56
6.67
1.59
6.67
Federal SB16N.150F
Acme T-1-81056
Hammond QC15ESCB
KVA
Amps
0.56
4.69
1.06
9.38
1.12
9.38
1.11
4.69
1.14
4.69
2.15
9.37
2.20
9.37
2.25
9.37
1.27
10.63
1.13
5.31
2.25
10.00
2.30
10.00
2.34
10.00
2.39
10.00
Federal SB16N.250F
Acme T-1-81057
Hammond QC25ESCB
KVA
Amps
0.94
7.81
1.77
15.63
1.86
15.63
1.84
7.81
1.90
7.81
3.58
15.62
3.67
15.62
3.75
15.62
2.11
17.71
1.88
8.85
3.75
16.67
3.83
16.67
3.91
16.67
3.98
16.67
Federal SB16N.500F
Acme T-1-81058
Hammond QC50ESCB
KVA
Amps
1.88
15.63
3.54
31.25
3.72
31.25
3.68
15.63
3.81
15.63
7.17
31.25
7.33
31.25
7.50
31.25
4.22
35.42
3.75
17.71
7.50
33.33
7.66
33.33
7.81
33.33
7.97
33.33
Federal SB16N.750F
Acme T-1-81059
Hammond QC75ESCB
KVA
Amps
2.82
23.44
5.31
46.88
5.58
46.88
5.53
23.44
5.71
23.44
10.75
46.87
11.00
46.87
11.25
46.87
6.33
53.13
5.63
26.56
11.25
50.00
11.48
50.00
11.72
50.00
11.95
50.00
Federal SB16N1F
Acme T-1-13073
Hammond Q1C0ESCB
KVA
Amps
3.76
31.25
7.08
62.50
7.44
62.50
7.37
31.25
7.61
31.25
14.33
62.50
14.67
62.50
15.00
62.50
8.44
70.83
7.50
35.42
15.00
66.67
15.31
66.67
15.62
66.67
15.94
66.67
Federal SB16N1.5F
Acme T-1-13074
Hammond Q1C5ESCF
KVA
Amps
5.64
46.88
10.63
93.75
11.16
93.75
11.05
46.88
11.42
46.88
21.50
93.75
22.00
93.75
22.50
93.75
12.66
106.25
11.25
53.13
22.50
100.00
22.97
100.00
23.44
100.00
23.91
100.00
Federal SB16N2F
Acme T-1-13075
Hammond Q002ESCF
KVA
Amps
7.52
62.50
14.71
125.00
14.88
125.00
14.73
62.50
15.23
62.50
28.67
125.00
29.33
125.00
30.00
125.00
16.88
141.67
15.00
70.83
30.00
133.33
30.62
133.33
31.25
133.33
31.87
133.33
Federal SB16N3F
Acme T-1-13076
Hammond Q003ESCF
KVA
Amps
11.28
93.75
21.25
187.50
22.31
187.50
22.10
93.75
22.84
93.75
43.00
187.50
44.00
187.50
45.00
187.50
25.31
212.50
22.50
106.25
45.00
200.00
45.94
200.00
46.87
200.00
47.81
200.00
Federal SB16N5F
Acme T-1-13077
Hammond Q005ESCF
KVA
Amps
18.80
156.25
35.42
312.50
37.19
312.50
36.83
156.25
38.07
156.25
71.67
312.50
73.33
312.50
75.00
312.50
42.19
354.17
37.50
177.08
75.00
333.33
76.56
333.33
78.12
333.33
79.69
333.33
Catalog Number Conn.
Diag.
B A A D D C C C A D C C C C
  Output for lower voltage can be found by:  Rated Output Voltage
Rated Input Voltage
x  Input Actual Voltage = Output New Voltage.
 
Output KVA available at reduced voltage can be found by:  Actual Input Voltage
Rated Input Voltage
x  Output KVA = New KVA Rating.
 
Buck-Boost Transformer Selection Chart
120 x 240 Volts Primary–16/32 Volts Secondary
 Three Phase BOOSTING BUCKING
Line Voltage (Available)  183Y
106
208Y
120
195 208 225 240 245 250 256 265 272
Load Voltage (Available)  208Y
120
236Y
136
208 236 240 208 230 234 240 234 240
Click part # for info Conn.
Diag.
F F H G H L H H H G G
Federal SB16N.050F
Acme T-1-81054
Hammond QC05ESCB
KVA
Amps
1.12
3.13
1.28
3.13
1.13
3.12
0.64
1.56
1.30
3.12
0.56
1.56
1.33
3.33
1.35
3.33
1.39
3.33
0.72
1.77
0.74
1.77
Federal SB16N.100F
Acme T-1-81055
Hammond QC10ESCB
KVA
Amps
2.25
6.25
2.55
6.25
2.25
6.25
1.28
3.13
2.60
6.25
1.13
3.13
2.65
6.67
2.71
6.67
2.77
6.67
1.43
3.54
1.47
3.54
Federal SB16N.150F
Acme T-1-81056
Hammond QC15ESCB
KVA
Amps
3.37
9.38
3.83
9.38
3.38
9.37
1.91
4.69
3.90
9.37
1.69
4.69
3.98
10.00
4.06
10.00
4.16
10.00
2.15
5.31
2.21
5.31
Federal SB16N.250F
Acme T-1-81057
Hammond QC25ESCB
KVA
Amps
5.61
15.63
6.38
15.62
5.63
15.62
3.19
7.81
6.50
15.62
2.81
7.81
6.63
16.67
6.77
16.67
6.93
16.67
3.59
8.85
3.68
8.85
Federal SB16N.500F
Acme T-1-81058
Hammond QC50ESCB
KVA
Amps
11.23
31.25
12.76
31.25
11.26
31.25
6.38
15.63
12.99
31.25
5.63
15.63
13.26
33.33
13.53
33.33
13.86
33.33
7.17
17.71
7.36
17.71
Federal SB16N.750F
Acme T-1-81059
Hammond QC75ESCB
KVA
Amps
16.84
46.88
19.14
46.88
16.89
46.87
9.58
23.44
19.49
46.87
8.44
23.44
19.89
50.00
20.30
50.00
20.78
50.00
10.76
26.56
11.04
26.56
Federal SB16N1F
Acme T-1-13073
Hammond Q1C0ESCB
KVA
Amps
22.45
62.50
25.52
62.50
22.52
62.50
12.76
31.25
25.98
62.50
11.26
31.25
26.52
66.67
27.06
66.67
27.71
66.67
14.34
35.42
14.72
35.42
Federal SB16N1.5F
Acme T-1-13074
Hammond Q1C5ESCF
KVA
Amps
33.68
93.75
38.28
93.75
33.77
93.75
19.14
46.88
38.97
93.75
16.89
46.88
39.78
100.00
40.59
100.00
41.57
100.00
21.52
53.13
22.08
53.13
Federal SB16N2F
Acme T-1-13075
Hammond Q002ESCF
KVA
Amps
44.90
125.00
51.04
125.00
45.03
125.00
25.52
62.50
51.96
125.00
22.52
62.50
53.04
133.33
54.13
133.33
55.43
133.33
28.69
70.83
29.44
70.83
Federal SB16N3F
Acme T-1-13076
Hammond Q003ESCF
KVA
Amps
67.36
187.50
76.56
187.50
67.55
187.50
38.28
93.75
77.94
187.50
33.77
93.75
79.57
200.00
81.19
200.00
83.14
200.00
43.03
106.25
44.17
106.25
Federal SB16N5F
Acme T-1-13077
Hammond Q005ESCF
KVA
Amps
112.26
312.50
127.59
312.50
112.58
312.50
63.80
156.25
129.90
312.50
56.29
156.25
132.61
333.33
135.32
333.33
138.56
333.33
71.72
177.08
73.61
177.08
No. of Transformers 3 3 2 2 2 2 2 2 2 2 2
Catalog Number Conn.
Diag.
F F H G H L H H H G G
  Output for lower voltage can be found by:  Rated Output Voltage
Rated Input Voltage
x  Input Actual Voltage = Output New Voltage.
 
Output KVA available at reduced voltage can be found by:  Actual Input Voltage
Rated Input Voltage
x  Output KVA = New KVA Rating.
 
Buck-Boost Transformer Selection Chart
240 x 480 Volts Primary–24/48 Volts Secondary
 Single Phase BOOSTING BUCKING
Line Voltage (Available)  230 380 416 425 430 435 440 450 465 132 277 480 480 504
Load Voltage (Output)  276 418 458 468 473 457 462 495 483 126 231 436 457 480
Click part # for info Conn.
Diag.
B D D D D C C D C C B D C C
Federal SB24N.050F
Acme T-1-81061
Hammond QC05DTCB
KVA
Amps
0.29
1.04
0.44
1.04
0.48
1.04
0.49
1.04
0.49
1.04
0.95
2.08
0.96
2.08
0.52
1.04
1.01
2.08
0.28
2.19
0.29
1.25
0.50
1.15
1.02
2.19
1.05
2.19
Federal SB24N.100F
Acme T-1-81062
Hammond QC10DTCB
KVA
Amps
0.58
2.08
0.87
2.08
0.95
2.08
0.97
2.08
0.99
2.08
1.90
4.17
1.93
4.17
1.03
2.08
2.01
4.17
0.55
4.38
0.58
2.50
1.00
2.29
2.00
4.38
2.10
4.38
Federal SB24N.150F
Acme T-1-81063
Hammond QC15DTCB
KVA
Amps
0.86
3.13
1.31
3.13
1.43
3.13
1.46
3.13
1.48
3.13
2.85
6.25
2.89
6.25
1.55
3.13
3.02
6.25
0.83
6.56
0.87
3.75
1.50
3.44
3.00
6.56
3.15
6.56
Federal SB24N.250F
Acme T-1-81064
Hammond QC25DTCB
KVA
Amps
1.44
5.21
2.18
5.21
2.38
5.21
2.43
5.21
2.46
5.21
4.76
10.42
4.81
10.42
2.58
5.21
5.03
10.42
1.38
10.94
1.44
6.25
2.50
5.73
5.00
10.94
5.25
10.94
Federal SB24N.500F
Acme T-1-81065
Hammond QC50DTCB
KVA
Amps
2.88
10.42
4.35
10.42
4.77
10.42
4.87
10.42
4.93
10.42
9.52
20.83
9.63
20.83
5.16
10.42
10.06
20.83
2.75
21.88
2.89
12.50
5.00
11.46
10.00
21.88
10.50
21.88
Federal SB24N.750F
Acme T-1-81066
Hammond QC75DTCB
KVA
Amps
4.31
15.63
6.53
15.63
7.15
15.62
7.30
15.63
7.39
15.63
14.27
31.25
14.44
31.25
7.73
15.63
15.09
31.25
4.13
32.81
4.33
18.75
7.50
17.91
15.00
32.81
15.75
17.19
Federal SB24N1F
Acme T-1-37920
Hammond Q1C0DTCB
KVA
Amps
5.75
20.83
8.71
20.83
9.53
20.83
9.74
20.83
9.85
20.83
19.03
41.67
19.25
41.67
10.31
20.83
20.13
41.67
5.50
43.75
5.77
25.00
10.00
22.92
20.00
43.75
21.00
43.75
Federal SB24N1.5F
Acme T-1-37921
Hammond Q1C5DTCF
KVA
Amps
8.63
31.25
13.06
31.25
14.30
31.25
14.61
31.25
14.78
31.25
28.55
62.50
28.88
62.50
15.47
31.25
30.19
62.50
8.25
65.63
8.66
37.50
15.00
34.37
30.00
65.63
31.50
65.63
Federal SB24N2F
Acme T-1-37922
Hammond Q002DTCF
KVA
Amps
11.50
41.67
17.42
41.67
19.07
41.67
19.48
41.67
19.71
41.67
38.06
83.33
38.50
83.33
20.63
41.67
40.25
83.33
11.00
87.50
11.54
50.00
20.00
45.83
40.00
87.50
42.00
87.50
Federal SB24N3F
Acme T-1-37923
Hammond Q003DTCF
KVA
Amps
17.25
62.50
26.13
62.50
28.60
62.50
29.22
62.50
29.56
62.50
57.09
125.00
57.75
125.00
30.94
62.50
60.38
125.00
16.50
131.25
17.31
75.00
30.00
68.75
60.00
131.25
63.00
131.25
Federal SB24N5F
Acme T-1-37924
Hammond Q005DTCF
KVA
Amps
28.75
104.17
43.54
104.17
47.67
104.17
48.70
104.17
49.27
104.17
95.16
208.33
96.25
208.33
51.56
104.17
100.63
208.33
27.50
218.75
28.85
125.00
50.00
114.58
100.00
218.75
105.00
218.75
Catalog Number Conn.
Diag.
B D D D D C C D C C B D C C
  Output for lower voltage can be found by:  Rated Output Voltage
Rated Input Voltage
x  Input Actual Voltage = Output New Voltage.
 
Output KVA available at reduced voltage can be found by:  Actual Input Voltage
Rated Input Voltage
x  Output KVA = New KVA Rating.
 
Buck-Boost Transformer Selection Chart
240 x 480 Volts Primary–24/48 Volts Secondary
 Three Phase BOOSTING BUCKING
Line Voltage (Available)  399Y
230
380 430 440 460 460 480 480 440 440 460 460 460 480 500 500
Load Voltage (Available)  480Y
277
418 473 462 506 483 528 504 400 419 438 418 457 436 455 476
Click part # for info Conn.
Diag.
E G G H G H G H G H H G H G G H
Federal SB24N.050F
Acme T-1-81061
Hammond QC05DTCB
KVA
Amps
0.86
1.04
0.75
1.04
0.85
1.04
1.67
2.08
0.91
1.04
1.74
2.08
0.95
1.04
1.82
2.08
0.79
1.15
1.59
2.19
1.66
2.19
0.83
1.15
1.73
2.19
0.87
1.15
0.90
1.15
1.80
2.19
Federal SB24N.100F
Acme T-1-81062
Hammond QC10DTCB
KVA
Amps
1.73
2.08
1.51
2.08
1.71
2.08
3.33
4.17
1.83
2.08
3.49
4.17
1.91
2.08
3.64
4.17
1.59
2.29
3.18
4.38
3.32
4.38
1.66
2.29
3.46
4.38
1.73
2.29
1.80
2.29
3.61
4.38
Federal SB24N.150F
Acme T-1-81063
Hammond QC15DTCB
KVA
Amps
2.59
3.13
2.26
3.13
2.56
3.13
5.00
6.25
2.74
3.13
5.23
6.25
2.86
3.13
5.46
6.25
2.38
3.44
4.76
6.56
4.98
6.56
2.49
3.44
5.20
6.56
2.60
3.44
2.71
3.44
5.41
6.56
Federal SB24N.250F
Acme T-1-81064
Hammond QC25DTCB
KVA
Amps
4.32
5.21
3.77
5.21
4.27
5.21
8.34
10.42
4.56
5.21
8.71
10.42
4.76
5.21
9.09
10.42
3.97
5.73
7.94
10.94
8.30
10.94
4.15
5.73
8.66
10.94
4.33
5.73
4.51
5.73
9.02
10.94
Federal SB24N.500F
Acme T-1-81065
Hammond QC50DTCB
KVA
Amps
8.64
10.42
7.54
10.42
8.53
10.42
16.67
20.83
9.13
10.42
17.43
20.83
9.53
10.42
18.19
20.83
7.94
11.46
15.88
21.88
16.60
21.88
8.30
11.46
17.32
21.88
8.66
11.46
9.02
11.46
18.04
21.88
Federal SB24N.750F
Acme T-1-81066
Hammond QC75DTCB
KVA
Amps
12.96
15.62
11.31
15.63
12.80
15.63
25.01
31.25
13.69
15.63
26.14
31.25
14.29
15.63
27.28
31.25
11.91
17.19
23.82
32.81
24.90
32.81
12.45
17.19
25.98
32.81
12.99
17.19
13.53
17.19
27.06
32.81
Federal SB24N1F
Acme T-1-37920
Hammond Q1C0DTCB
KVA
Amps
17.28
20.83
15.08
20.83
17.07
20.83
33.34
41.67
18.26
20.83
34.86
41.67
19.05
20.83
36.37
41.67
15.88
22.92
31.75
43.75
33.20
43.75
16.60
22.92
34.64
43.75
17.32
22.92
18.04
22.92
36.08
43.75
Federal SB24N1.5F
Acme T-1-37921
Hammond Q1C5DTCF
KVA
Amps
25.92
31.25
22.62
31.25
25.60
31.25
50.01
62.50
27.39
31.25
52.29
62.50
28.58
31.25
54.66
62.50
23.82
34.38
47.63
65.63
49.80
65.63
24.90
34.38
51.96
65.63
25.98
34.37
27.06
34.37
54.13
65.63
Federal SB24N2F
Acme T-1-37922
Hammond Q002DTCF
KVA
Amps
34.55
41.67
30.17
41.67
34.14
41.67
66.68
83.33
36.52
41.67
69.72
83.33
38.11
41.67
72.75
83.33
31.75
45.83
63.51
87.50
66.40
87.50
33.20
45.83
69.28
87.50
34.64
45.83
36.08
45.83
72.17
87.50
Federal SB24N3F
Acme T-1-37923
Hammond Q003DTCF
KVA
Amps
51.83
62.50
45.25
62.50
51.20
62.50
100.03
125.00
54.78
62.50
104.57
125.00
57.16
62.50
109.12
125.00
47.63
68.75
95.26
131.25
99.59
131.25
49.80
68.75
103.92
131.25
51.96
68.75
54.13
68.75
108.25
131.25
Federal SB24N5F
Acme T-1-37924
Hammond Q005DTCF
KVA
Amps
86.39
104.17
75.42
104.17
85.34
104.17
166.71
208.33
91.29
104.17
174.29
208.33
95.26
104.17
181.87
208.33
79.39
114.58
158.77
218.75
165.99
218.75
82.99
114.58
173.21
218.75
86.60
114.58
90.21
114.58
180.42
218.75
No. of Transformers 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2
Catalog Number Conn.
Diag.
E G G H G H G H G H H G H G G H
  Output for lower voltage can be found by:  Rated Output Voltage
Rated Input Voltage
x  Input Actual Voltage = Output New Voltage.
 
Output KVA available at reduced voltage can be found by:  Actual Input Voltage
Rated Input Voltage
x  Output KVA = New KVA Rating.
 

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Experienced since 1968 with electrical power distribution products, AAA Acme General Electrical Power Transformer Distribution started as a family owned and run company. Today we have grown to be a National Supplier of quality brand name power transformers. We distribute a wide variety of high quality single and three phase power transformers daily from regional warehouses at wholesale prices.

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