| Standard Model | Output Voltage/Current |
| 200125 | Step Down Transformer 6V- 30V / 3 Amp (Suitable for Callender and Barne’s apparatus) |
| 200126 | Step Down Transformer 8V / 3 Amp (Suitable for Electromagnet Apparatus & Sonometer) |
| 200127 | Transformer for Sodium Vapour Lamp 35 watts. |
| 200128 | Transformer for Sodium Vapour Lamp 55 watts |
