Buck Boost Transformers

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Buck Boost Transformer Installation
Details and further information regarding installation and basic configurations.

Three Phase Buck Boost Transformers
Fundamental data with links to listings of transformers used in 3 phase applications.

Low Voltage Applications
A basic description and links to transformers recommended for low voltage applications.

AC Line Reactors
Adjust, block or otherwise handle unwanted power characteristics often generated during normal use of power in an area. Not to be confused with the need for a Buck Boost or other type Transformer.

Federal Pacific Buck Boost Transformers
Quality transformers built in the USA.

Acme Buck Boost Transformers
A reliable leading American transformer distributing company.

Hammond Buck Boost Transformers
Originated as a family -owned and run company and is now a nation-wide distributor!

Jefferson Buck Boost Transformers
In business over 93 years; supplying a diverse selection of products to an equally diverse clientele.

Other Popular Voltage Transformers
Power transmission and distribution requires voltage and line characteristics to be altered and adjusted in several ways. Read up on what is generally available.

TEMCo Buck Boost Transformers
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Buck Boost Transformers

Buck Boost Transformer Installation  Three Phase Buck Boost Transformers  Low Voltage Applications  AC Line Reactors 
Acme Buck Boost Transformers  Hammond Buck Boost Transformers 
Jefferson Buck Boost Transformers  Other Popular Voltage Transformers  TEMCo Buck Boost Transformers

Acme carries a ful line of transformers including Buck Boost Transformers.

transformer guide
Small kVA 3 Phase Transformers

BUCK BOOST TRANSFORMERS

RESOURCE LINKS, TYPES & DESCRIPTIONS

Buck Boost TransformersBuck Boost Transformers were developed to supply voltages for two main categories; the first of which is when the local power is consistently not high or low enough to correctly and safely run the equipment at its rated power load.

For loads demanding slightly higher voltages than available a  Buck Boost Transformer can be designed such that the majority of the line load is passed directly through to the power source while only that amount of kVA needed to adjust to corrected specifications is actually added. This allows much smaller Buck Boost Transformers to service a significantly greater supply to a load than the kVA that is indicated on the transformer nameplate.

Common examples of this application of Buck Boost Transformers would be where motors and HVAC equipment is operating on a line supplying 110V or 230V when the equipment demands 120V or 240V service. A Buck Boost Transformer is designed to lower (buck) or raise (boost) line voltage in a range of 5% to 20%.

Buck Boost Transformers are also used when significantly lower voltages are needed, as in low voltage lighting and landscape lighting.

Primary voltages running from 110V to 440V are lowered to secondary voltages as low as 12 volts, but can also be 16, 24, 32 or 48 volts and can be configured by custom design to fit other voltages.

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.
 
Cons:

Buck Boost Transformers provide no circuit isolation under most common uses, the KVA and voltages do not match those on the nameplate, and they cannot create a neutral.

Pros:
They are inexpensive, smaller and lighter, more efficient, and can be used in a variety of applications. They are also often wired with at least 4 windings. This makes them more versatile because they can be wired eight different ways and provide a number of KVA and voltage choices.

Important!!! Buck Boost Transformers do not adjust for variable voltage conditions but only handle chronically existing high or low situations. You will probably need to install an AC Line Reactor to address that problem.

Warning!!! Significant damage can be incurred if some equipment and applications are run at voltages higher or lower than their rated load. Buck Boost Transformers will prevent this!

Contact TEMCo for your Buck Boost Transformer needs. TEMCo carries most major brands and offers competitive pricing with quick delivery. Custom-made products are also available.

Contractors and individuals who need portable power sources and lighting may also want to check out the Diesel Generators available through TEMCo.TEMCo carries a full line of Buck Boost Transformers

Call (510) 490-2187
(US & International)
 or 1-800-613-2290 (US only)
for prices and information.
Wholesale Pricing Available!

 

Bookmark this site:

BUCK BOOST TRANSFORMERS

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