| STN (types on stock) | Single-phase-control transformers with preferred rated voltages (types on stock) |
| STI (types on stock) | Single-phase control, isolation and safety transf. with preferred rated voltages (types on stock) |
| STN | Single-phase control transformers |
| STI | Single-phase control, isolation and safety transformers |
| STZ | Single-phase control, isolation and safety transformers |
| STA | Single-phase control transformers (ATEX-tested) |
| ET, ETF | Single-phase matching transformers |
| ETSP, ETFSP | Single-phase autotransformers |
| UTI | Single-phase multi-winding transformers |
| DTI | Three-phase control, isolating and safety transformers |
| DTZ | Three-phase control, isolation and safety transformers |
| DT | Three-phase matching transformers |
| DTF | Three-phase transformers |
| D4TB, D4TF | Three-phase transformers with 4% uk |
| DTSP | Three-phase autotransformers |
| DTFSP | Three-phase autotransformers |
| DSB | Earthing autotransformers |
