The RS12 on-load tap changer is a single and three phase tap changer in oil technology which is Elprom’s most compact design. It is the preferred choice for small to medium transformers in distribution and transmission grids. The RS12 features a design with the oil vessel in a single compartment facilitating ease of repair and maintenance. The RS12 is designed and manufactured according to the requirements of the International Standard IEC 60214-1.
| Rated current three phase (A) | 200, 400 |
| Rated voltage (kV) | 41,5; 72,5; 123 – for star connected windings 41,5; 72,5 – for delta connection windings |
| Step voltage (V) | Up to 2500 |
| Connection diagrams | With and without coarse and reverse change-over selector |
| Number of steps | Up to 27 |
| Carrying flange shape | Round |
| Standard | IEC/IEEE 60214-1 |
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