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J.H. Larson Company | |
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| FPE Buck-Boost Transformer Selection
Chart 120x240 Volts Primary–12/24 Volts Secondary |
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| 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 | |
| Catalog Number | Connection Diagram |
B | B | A | A | D | D | D | D | A | A | D | D | D | C |
| SB12N.050F 0.05 KVA |
KVA Amps Fuse** |
0.24 2.08 4* |
0.25 2.08 4* |
0.48 4.17 6 |
0.50 4.17 6 |
0.43 2.08 3 |
0.48 2.08 3 |
0.50 2.08 3 |
0.50 2.08 3 |
0.52 4.58 6 |
0.55 4.58 6 |
0.48 2.29 3 |
0.51 2.29 3 |
0.52 2.29 3 |
1.05 4.38 6 |
| SB12N.100F 0.10 KVA |
KVA Amps Fuse** |
0.48 4.17 8* |
0.50 4.17 8* |
0.96 8.33 15 |
1.00 8.33 15 |
0.87 4.17 6 |
0.95 4.17 6 |
1.00 4.17 6 |
1.01 4.17 6 |
1.04 9.17 12* |
1.10 9.17 12* |
0.95 4.58 6 |
1.02 4.58 6 |
1.04 4.58 6 |
2.10 8.75 12* |
| SB12N.150F 0.15 KVA |
KVA Amps Fuse** |
0.72 6.25 10 |
0.75 6.25 10 |
1.44 12.50 20 |
1.50 12.50 20 |
1.30 6.25 10 |
1.43 6.25 10 |
1.50 6.25 10 |
1.51 6.25 10 |
1.56 13.75 20 |
1.65 13.75 20 |
1.43 6.87 10 |
1.53 6.87 10 |
1.56 6.87 10 |
3.15 13.13 20 |
| SB12N.250F 0.25 KVA |
KVA Amps Fuse** |
1.20 10.42 20 |
1.25 10.42 20 |
2.41 20.83 30 |
2.50 20.83 30 |
2.17 10.42 15 |
2.38 10.42 15 |
2.50 10.42 15 |
2.52 10.42 15 |
2.60 22.92 30 |
2.75 22.92 30 |
2.39 11.46 15 |
2.55 11.46 15 |
2.60 11.46 15 |
5.25 21.88 30 |
| SB12N.500F 0.50 KVA |
KVA Amps Fuse** |
2.40 20.83 35 |
2.50 20.83 35 |
4.81 41.67 60 |
5.00 41.67 60 |
4.33 20.83 30 |
4.77 20.83 30 |
5.00 20.83 30 |
5.04 20.83 30 |
5.21 45.83 60 |
5.50 45.83 60 |
4.77 22.92 30 |
5.10 22.92 30 |
5.21 22.92 30 |
10.50 43.75 60 |
| SB12N.750F 0.75 KVA |
KVA Amps Fuse** |
3.60 31.25 50 |
3.75 31.25 50 |
7.22 62.50 90 |
7.38 62.50 90 |
6.50 31.25 45 |
7.15 31.25 45 |
7.49 31.25 45 |
7.56 31.25 45 |
7.81 68.75 80 |
8.25 68.75 80 |
7.16 34.37 40 |
7.66 34.37 40 |
7.81 34.37 40 |
15.75 65.63 80 |
| SB12N1F 1.00 KVA |
KVA Amps Fuse** |
4.80 41.67 70 |
5.00 41.67 70 |
9.63 83.33 125 |
9.99 83.33 125 |
8.66 41.67 60 |
9.53 41.67 60 |
9.99 41.67 60 |
10.08 41.67 60 |
10.42 91.67 110 |
11.00 91.67 110 |
9.54 45.83 60 |
10.21 45.83 60 |
10.42 45.83 60 |
21.00 87.50 110 |
| SB12N1.5F 1.50 KVA |
KVA Amps Fuse** |
7.20 62.50 100 |
7.50 62.50 100 |
14.44 125.00 175 |
14.99 125.00 175 |
12.99 62.50 90 |
14.30 62.50 90 |
14.99 62.50 90 |
15.13 62.50 90 |
15.62 137.50 175 |
16.50 137.50 175 |
14.31 68.75 80 |
15.31 68.75 80 |
15.62 68.75 80 |
31.50 131.25 175 |
| SB12N2F 2.00 KVA |
KVA Amps Fuse** |
9.60 83.33 125 |
10.00 83.33 125 |
19.25 166.67 250 |
19.98 166.67 250 |
17.32 83.33 125 |
19.07 83.33 125 |
19.98 83.33 125 |
20.17 83.33 125 |
20.83 183.33 225 |
22.00 183.33 225 |
19.08 91.67 110 |
20.42 91.67 110 |
20.83 91.67 110 |
42.00 175.00 225 |
| SB12N3F 3.00 KVA |
KVA Amps Fuse** |
14.40 125.00 200 |
15.00 125.00 200 |
28.88 250.00 350 |
29.98 250.00 350 |
25.99 125.00 175 |
28.60 125.00 175 |
29.98 125.00 175 |
30.25 125.00 175 |
31.25 275.00 350 |
33.00 275.00 350 |
28.62 137.50 175 |
30.62 137.50 175 |
31.25 137.50 175 |
63.00 262.50 350 |
| SB12N5F 5.00 KVA |
KVA Amps Fuse** |
24.00 208.33 350 |
25.00 208.33 350 |
48.13 416.67 600 |
49.96 416.67 600 |
43.31 208.33 300 |
47.67 208.33 300 |
49.96 208.33 300 |
50.42 208.33 300 |
52.08 458.33 600 |
55.00 458.33 600 |
47.71 229.17 300 |
51.04 229.17 300 |
52.08 229.17 300 |
105.00 437.50 600 |
| Catalog Number | Connection Diagram |
B | B | A | A | D | D | D | D | A | A | D | D | D | C |
| * Non-NEC standard fuse size (NEC 240-6), check with local authorities for use of next larger size. | |||
| ** Maximum fuse or circuit breaker size per NEC 450-4. |
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| 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. | |