| Feature | Autotransformer | Traditional Transformer |
| Structure1 | Primary and secondary share part of the winding | Primary and secondary have separate windings |
| Voltage Conversion Principle | Partial shared windings, voltage changes according to winding ratio | Complete isolation, voltage change based on turns ratio |
| Voltage Ratio Range | Suitable for voltage ratios of up to 2-3 times | Can handle larger voltage ratios |
| Efficiency | High efficiency, low loss | Slightly lower efficiency due to more windings and losses |
| Size & Weight | Compact, lightweight | Bulkier, heavier |
| Cost | Lower cost | Higher cost |
| Electrical Isolation | No complete electrical isolation, lower safety | Complete electrical isolation, higher safety |
| Applications | Motor starting, voltage regulation | High voltage transmission, applications requiring electrical isolation |
| Safety | May cause over-voltage issues, requires additional protection | High safety, suitable for high-risk environments |
