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J.H. Larson Company | |
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| FPE Buck-Boost Transformer Selection
Chart 120x240 Volts Primary–16/32 Volts Secondary |
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| 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 | |
| Catalog Number | Connection Diagram |
B | A | A | D | D | C | C | C | A | D | C | C | C | C |
| SB16N.050F 0.05 KVA |
KVA Amps Fuse** |
0.19 1.56 3 |
0.35 3.13 5* |
0.37 3.13 5* |
0.37 1.56 2.5* |
0.38 1.56 2.5* |
0.72 3.12 5* |
0.73 3.13 5* |
0.75 3.12 5* |
0.42 3.54 5* |
0.38 1.77 2.5* |
0.75 3.33 5* |
0.77 3.33 5* |
0.78 3.33 5* |
0.80 3.33 5* |
| SB16N.100F 0.10 KVA |
KVA Amps Fuse** |
0.38 3.13 6 |
0.71 6.25 10 |
0.74 6.25 10 |
0.74 3.13 5* |
0.76 3.13 5* |
1.43 6.25 10 |
1.47 6.25 10 |
1.50 6.25 10 |
0.84 7.08 10 |
0.75 3.54 5* |
1.50 6.67 10 |
1.53 6.67 10 |
1.56 6.67 10 |
1.59 6.67 10 |
| SB16N.150F 0.15 KVA |
KVA Amps Fuse** |
0.56 4.69 8* |
1.06 9.38 15 |
1.12 9.38 15 |
1.11 4.69 8* |
1.14 4.69 8* |
2.15 9.37 15 |
2.20 9.37 15 |
2.25 9.37 15 |
1.27 10.63 15 |
1.13 5.31 6 |
2.25 10.00 15 |
2.30 10.00 15 |
2.34 10.00 15 |
2.39 10.00 15 |
| SB16N.250F 0.25 KVA |
KVA Amps Fuse** |
0.94 7.81 15 |
1.77 15.63 25 |
1.86 15.63 25 |
1.84 7.81 12* |
1.90 7.81 12* |
3.58 15.62 25 |
3.67 15.62 25 |
3.75 15.62 25 |
2.11 17.71 20 |
1.88 8.85 10 |
3.75 16.67 20 |
3.83 16.67 20 |
3.91 16.67 20 |
3.98 16.67 20 |
| SB16N.500F 0.50 KVA |
KVA Amps Fuse** |
1.88 15.63 25 |
3.54 31.25 45 |
3.72 31.25 45 |
3.68 15.63 25 |
3.81 15.63 25 |
7.17 31.25 45 |
7.33 31.25 45 |
7.50 31.25 45 |
4.22 35.42 40 |
3.75 17.71 20 |
7.50 33.33 40 |
7.66 33.33 40 |
7.81 33.33 40 |
7.97 33.33 40 |
| SB16N.750F 0.75 KVA |
KVA Amps Fuse** |
2.82 23.44 40 |
5.31 46.88 70 |
5.58 46.88 70 |
5.53 23.44 35 |
5.71 23.44 35 |
10.75 46.87 70 |
11.00 46.87 70 |
11.25 46.87 70 |
6.33 53.13 60 |
5.63 26.56 30 |
11.25 50.00 60 |
11.48 50.00 60 |
11.72 50.00 60 |
11.95 50.00 60 |
| SB16N1F 1.00 KVA |
KVA Amps Fuse** |
3.76 31.25 50 |
7.08 62.50 90 |
7.44 62.50 90 |
7.37 31.25 45 |
7.61 31.25 45 |
14.33 62.50 90 |
14.67 62.50 90 |
15.00 62.50 90 |
8.44 70.83 80 |
7.50 35.42 40 |
15.00 66.67 80 |
15.31 66.67 80 |
15.62 66.67 80 |
15.94 66.67 80 |
| SB16N1.5F 1.50 KVA |
KVA Amps Fuse** |
5.64 46.88 80 |
10.63 93.75 150 |
11.16 93.75 150 |
11.05 46.88 70 |
11.42 46.88 70 |
21.50 93.75 125 |
22.00 93.75 125 |
22.50 93.75 125 |
12.66 106.25 125 |
11.25 53.13 60 |
22.50 100.00 125 |
22.97 100.00 125 |
23.44 100.00 125 |
23.91 100.00 125 |
| SB16N2F 2.00 KVA |
KVA Amps Fuse** |
7.52 62.50 100 |
14.71 125.00 200 |
14.88 125.00 200 |
14.73 62.50 90 |
15.23 62.50 90 |
28.67 125.00 175 |
29.33 125.00 175 |
30.00 125.00 175 |
16.88 141.67 175 |
15.00 70.83 80 |
30.00 133.33 175 |
30.62 133.33 175 |
31.25 133.33 175 |
31.87 133.33 175 |
| SB16N3F 3.00 KVA |
KVA Amps Fuse** |
11.28 93.75 150 |
21.25 187.50 300 |
22.31 187.50 300 |
22.10 93.75 150 |
22.84 93.75 150 |
43.00 187.50 250 |
44.00 187.50 250 |
45.00 187.50 250 |
25.31 212.50 250 |
22.50 106.25 125 |
45.00 200.00 250 |
45.94 200.00 250 |
46.87 200.00 250 |
47.81 200.00 250 |
| SB16N5F 5.00 KVA |
KVA Amps Fuse** |
18.80 156.25 250 |
35.42 312.50 450 |
37.19 312.50 450 |
36.83 156.25 225 |
38.07 156.25 225 |
71.67 312.50 450 |
73.33 312.50 450 |
75.00 312.50 450 |
42.19 354.17 400 |
37.50 177.08 200 |
75.00 333.33 400 |
76.56 333.33 400 |
78.12 333.33 400 |
79.69 333.33 400 |
| Catalog Number | Connection Diagram |
B | A | A | D | D | C | C | C | A | D | C | C | C | 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. | |