Voltage Convertors - Technical Notes

A Guide to Transformer Selection

The power consumption is stated in VA or Watts and can in most instances be considered the same, 300W = 300VA

Most appliances will have a rating label on the back Stating voltage and power for example: 120vac 198va in this case choose a 200va transformer

Always check individual rating label or instruction whenever possible.

If an inadequately rated transformer is used, the transformer will cut out periodically or blow fuses. In all cases it is important that the transformer is rated above the appliance with which it is to be used.

Clocks
If a timing device is included the speed of the device may change due to the frequency change. 60Hz to 50Hz
Digital clocks will be OK as they are not be affected by the change in frequency. However Analog clocks are and will run slowly.

Twin socket Transformers. The total load of both appliances must not exceed the rating shown on the label.

The above figures are an indication only and legal responsibility or liability for the accuracy or otherwise of any statement herein is hereby excluded in respect of the author of the material.