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Auto transformer is a single coiled winding on a laminated iron core on which there are various tapping points to produce different voltages.
The use of single winding means that the bulk of the device is much smaller than for a conventional double-wound transformer. And it depends on the ratio of primary to secondary.
This list is an example of dimensions with number of STB1 TYPE and SOA1 TYPE.
Capacity
(VA) |
Ratio voltage |
| 10 : 9 |
2 : 1 |
4 : 1 |
10 : 1 |
| 100 |
STB1-20 |
KW-50 |
KW-80 |
KW-100 |
| 300 |
KW-50 |
KW-150 |
KW-200 |
KW-300 |
| 500 |
KW-100 |
KW-300 |
KW-400 |
KW-50 |
| 800 |
KW-150 |
KW-400 |
KW-600 |
GW-800 |
| 1K |
KW-200 |
KW-500 |
KW-700 |
GW-1K |
| 2K |
KW-400 |
GW-1K |
GW-1.5K |
GW-2K |
| 3K |
KW-600 |
GW-1.5K |
GW-2.5K |
GW-3K |
| 4K |
KW-80 |
GW-2K |
GW-3 |
GW-4K |
| 5K |
GW-1K |
GW-2.5K |
GW-4 |
GW-5K |
* "Ratio voltage" means the ratio of primary to secondary.
Ex: primary=200v, secondary=100v, Ratio voltage=2:1
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