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Power Transformer Distribution |
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| 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 | Connection Diagram |
B | D | D | D | D | C | C | D | C | C | B | D | C | C |
| T-1-81061 | 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 |
| T-1-81062 | 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 |
| T-1-81063 | 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 |
| T-1-81064 | 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 |
| T-1-81065 | 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 |
| T-1-81066 | 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 |
| T-1-37920 | 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 |
| T-1-37921 | 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 |
| T-1-37922 | 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 |
| T-1-37923 | 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 |
| T-1-37924 | 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 | Connection Diagram |
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 | Connection Diagram |
E | G | G | H | G | H | G | H | G | H | H | G | H | G | G | H |
| T-1-81061 | 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 |
| T-1-81062 | 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 |
| T-1-81063 | 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 |
| T-1-81064 | 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 |
| T-1-81065 | 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 |
| T-1-81066 | 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 |
| T-1-37920 | 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 |
| T-1-37921 | 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 |
| T-1-37922 | 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 |
| T-1-37923 | 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 |
| T-1-37924 | 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 | Connection Diagram |
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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