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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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| 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 | |
| Catalog Number | Connection Diagram |
F | E | E | F | J | K | G | G | G | H | G | G | G | G |
| SB12N.050F 0.05 KVA |
KVA Amps Fuse** |
1.50 4.17 6 |
0.84 2.08 4* |
0.87 2.08 4* |
1.65 4.17 6 |
1.65 2.08 3 |
3.15 4.17 6 |
0.75 2.08 3 |
0.83 2.08 3 |
0.87 2.08 6 |
1.57 4.38 6 |
0.83 2.29 3 |
0.90 2.29 3 |
0.92 2.29 3 |
0.95 2.29 3 |
| SB12N.100F 0.10 KVA |
KVA Amps Fuse** |
3.00 8.33 15 |
1.69 4.17 8* |
1.73 4.17 8* |
3.30 8.33 15 |
3.30 4.17 6 |
6.30 8.33 12* |
1.50 4.17 6 |
1.65 4.17 6 |
1.75 4.17 6 |
3.15 8.75 12* |
1.65 4.58 6 |
1.80 4.58 6 |
1.84 4.58 6 |
1.91 4.58 6 |
| SB12N.150F 0.15 KVA |
KVA Amps Fuse** |
4.50 12.50 20 |
2.53 6.25 10 |
2.60 6.25 10 |
4.95 12.50 20 |
4.95 6.25 10 |
9.46 12.50 20 |
2.25 6.25 10 |
2.48 6.25 10 |
2.62 6.25 10 |
4.72 13.13 20 |
2.48 6.87 10 |
2.71 6.87 10 |
2.76 6.88 10 |
2.86 6.88 10 |
| SB12N.250F 0.25 KVA |
KVA Amps Fuse** |
7.50 20.83 30 |
4.22 10.42 20 |
4.33 1.42 20 |
8.26 20.83 30 |
8.26 10.42 15 |
15.76 10.42 30 |
3.75 10.42 15 |
4.13 10.42 15 |
4.37 10.42 15 |
7.87 21.88 30 |
4.13 11.46 15 |
4.51 11.46 15 |
4.60 11.46 15 |
4.76 11.46 15 |
| SB12N.500F 0.50 KVA |
KVA Amps Fuse** |
15.00 41.67 60 |
8.44 20.83 35 |
8.66 20.83 35 |
16.51 41.67 60 |
16.51 20.83 30 |
31.52 241.67 60 |
7.50 20.83 30 |
8.26 20.83 30 |
8.73 20.83 30 |
15.73 43.75 60 |
8.26 22.92 30 |
9.02 22.92 30 |
9.20 22.92 30 |
9.53 22.92 30 |
| SB12N.750F 0.75 KVA |
KVA Amps Fuse** |
22.51 62.50 90 |
12.67 31.25 50 |
12.99 31.25 50 |
24.77 62.50 90 |
24.77 31.25 45 |
47.28 62.50 90 |
11.25 31.25 45 |
12.38 31.25 45 |
13.10 31.25 45 |
23.60 65.63 80 |
12.39 34.37 40 |
13.53 34.37 40 |
13.80 34.37 40 |
14.29 34.38 40 |
| SB12N1F 1.00 KVA |
KVA Amps Fuse** |
30.01 83.33 125 |
16.89 41.67 70 |
17.32 41.67 70 |
33.02 83.33 125 |
33.02 41.67 60 |
63.05 83.33 110 |
15.00 41.67 60 |
16.51 41.67 60 |
17.46 41.67 60 |
31.47 87.50 110 |
16.53 45.83 60 |
18.04 45.83 60 |
18.40 45.83 60 |
19.05 45.83 60 |
| SB12N1.5F 1.50 KVA |
KVA Amps Fuse** |
45.01 125.00 175 |
25.33 62.50 100 |
25.98 62.50 100 |
49.54 125.00 175 |
49.54 62.50 90 |
94.57 125.00 175 |
22.51 62.50 90 |
24.77 62.50 90 |
26.20 62.50 90 |
47.20 131.25 175 |
24.79 68.75 80 |
27.06 68.75 80 |
27.60 68.75 80 |
28.58 68.75 80 |
| SB12N2F 2.00 KVA |
KVA Amps Fuse** |
60.02 166.67 250 |
33.77 83.33 125 |
34.64 83.33 125 |
66.05 166.67 250 |
66.05 83.33 125 |
126.09 166.67 225 |
30.01 83.33 125 |
33.02 83.33 125 |
34.93 83.33 125 |
62.93 175.00 225 |
33.05 91.67 110 |
36.08 91.67 110 |
36.81 91.67 110 |
38.11 91.67 110 |
| SB12N3F 3.00 KVA |
KVA Amps Fuse** |
90.02 250.00 350 |
50.66 125.00 200 |
51.96 125.00 200 |
99.07 250.00 350 |
99.07 125.00 175 |
189.14 250.00 350 |
45.01 125.00 175 |
49.54 125.00 175 |
52.39 125.00 175 |
94.40 262.50 350 |
49.58 137.50 175 |
54.13 137.50 175 |
55.21 137.50 175 |
57.16 137.50 175 |
| SB12N5F 5.00 KVA |
KVA Amps Fuse** |
150.04 416.67 600 |
84.44 208.33 350 |
86.60 208.33 350 |
165.12 416.67 600 |
165.12 208.33 300 |
315.23 416.67 600 |
75.02 208.33 300 |
82.56 208.33 300 |
87.32 208.33 300 |
157.33 437.50 600 |
82.63 229.17 300 |
90.21 229.17 300 |
92.02 229.17 300 |
95.26 229.17 300 |
| No. of Transformers | 3 | 3 | 3 | 3 | 3 | 3 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | |
| Catalog Number | Connection Diagram |
F | E | E | F | J | K | G | G | G | H | G | G | 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. | |