Transformer Applications
Which transformer for which equipment. Sizing guides for air conditioners, kitchen appliances, power tools and machines.
Frequently asked questions about transformer applications
How do I size a transformer for a motor or compressor?
Motors draw three to five times their running wattage at startup. Multiply running wattage by three for refrigerators and air conditioners, then add margin. Undersizing here is the number one cause of nuisance tripping.
Can I run several appliances on one transformer?
Yes, as long as the total wattage stays under the transformer rating with headroom to spare. Appliances with motors should not all start at the same moment, so leave extra margin for the combined startup surge.
Why does my transformer trip when I plug in my appliance?
Usually it is startup surge from a motor or heating element, or the transformer is simply undersized. Check appliance wattage against the transformer VA rating - continuous overload will also trip the thermal cut-out.
Do I need a transformer or a voltage stabilizer?
A transformer converts voltage, for example 220V to 110V. A stabilizer holds output steady when the mains voltage swings up and down. If your wall voltage is both wrong and unstable, you need both.
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