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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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| 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 | |
| Catalog Number | Connection Diagram |
F | F | H | G | H | L | H | H | H | G | G |
| SB16N.050F 0.05 KVA |
KVA Amps Fuse** |
1.12 3.13 5* |
1.28 3.13 5* |
1.13 3.12 5* |
0.64 1.56 2.5* |
1.30 3.12 5* |
0.56 1.56 2.5* |
1.33 3.33 5* |
1.35 3.33 5* |
1.39 3.33 5* |
0.72 1.77 2.5* |
0.74 1.77 2.5* |
| SB16N.100F 0.10 KVA |
KVA Amps Fuse** |
2.25 6.25 10 |
2.55 6.25 10 |
2.25 6.25 10 |
1.28 3.13 5* |
2.60 6.25 10 |
1.13 3.13 5* |
2.65 6.67 10 |
2.71 6.67 10 |
2.77 6.67 10 |
1.43 3.54 5* |
1.47 3.54 5* |
| SB16N.150F 0.15 KVA |
KVA Amps Fuse** |
3.37 9.38 15 |
3.83 9.38 15 |
3.38 9.37 15 |
1.91 4.69 8* |
3.90 9.37 15 |
1.69 4.69 6 |
3.98 10.00 15 |
4.06 10.00 15 |
4.16 10.00 15 |
2.15 5.31 6 |
2.21 5.31 6 |
| SB16N.250F 0.25 KVA |
KVA Amps Fuse** |
5.61 15.63 25 |
6.38 15.62 25 |
5.63 15.62 25 |
3.19 7.81 12* |
6.50 15.62 25 |
2.81 7.81 10 |
6.63 16.67 20 |
6.77 16.67 20 |
6.93 16.67 20 |
3.59 8.85 10 |
3.68 8.85 10 |
| SB16N.500F 0.50 KVA |
KVA Amps Fuse** |
11.23 31.25 45 |
12.76 31.25 45 |
11.26 31.25 45 |
6.38 15.63 25 |
12.99 31.25 45 |
5.63 15.63 20 |
13.26 33.33 40 |
13.53 33.33 40 |
13.86 33.33 40 |
7.17 17.71 20 |
7.36 17.71 20 |
| SB16N.750F 0.75 KVA |
KVA Amps Fuse** |
16.84 46.88 70 |
19.14 46.88 70 |
16.89 46.87 70 |
9.58 23.44 35 |
19.49 46.87 70 |
8.44 23.44 30 |
19.89 50.00 60 |
20.30 50.00 60 |
20.78 50.00 60 |
10.76 26.56 30 |
11.04 26.56 30 |
| SB16N1F 1.00 KVA |
KVA Amps Fuse** |
22.45 62.50 90 |
25.52 62.50 90 |
22.52 62.50 90 |
12.76 31.25 45 |
25.98 62.50 90 |
11.26 31.25 40 |
26.52 66.67 80 |
27.06 66.67 80 |
27.71 66.67 80 |
14.34 35.42 40 |
14.72 35.42 40 |
| SB16N1.5F 1.50 KVA |
KVA Amps Fuse** |
33.68 93.75 150 |
38.28 93.75 150 |
33.77 93.75 125 |
19.14 46.88 70 |
38.97 93.75 125 |
16.89 46.88 60 |
39.78 100.00 125 |
40.59 100.00 125 |
41.57 100.00 125 |
21.52 53.13 60 |
22.08 53.13 60 |
| SB16N2F 2.00 KVA |
KVA Amps Fuse** |
44.90 125.00 200 |
51.04 125.00 200 |
45.03 125.00 175 |
25.52 62.50 90 |
51.96 125.00 175 |
22.52 62.50 80 |
53.04 133.33 175 |
54.13 133.33 175 |
55.43 133.33 175 |
28.69 70.83 80 |
29.44 70.83 80 |
| SB16N3F 3.00 KVA |
KVA Amps Fuse** |
67.36 187.50 300 |
76.56 187.50 300 |
67.55 187.50 250 |
38.28 93.75 150 |
77.94 187.50 250 |
33.77 93.75 125 |
79.57 200.00 250 |
81.19 200.00 250 |
83.14 200.00 250 |
43.03 106.25 125 |
44.17 106.25 125 |
| SB16N5F 5.00 KVA |
KVA Amps Fuse** |
112.26 312.50 450 |
127.59 312.50 450 |
112.58 312.50 450 |
63.80 156.25 225 |
129.90 312.50 450 |
56.29 156.25 200 |
132.61 333.33 400 |
135.32 333.33 400 |
138.56 333.33 400 |
71.72 177.08 200 |
73.61 177.08 200 |
| No. of Transformers | 3 | 3 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | |
| Catalog Number | Connection Diagram |
F | F | H | G | H | L | H | H | H | G | G |
| * 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. | |