AUTO TRANSFORMER
 
     
 

An autotransformer is an electrical transformer with only one winding.

This single coil has one or more extra taps or electrical connections in various positions along the winding. Each tap corresponds to a different voltage so that effectively a portion of the same inductor acts as part of both the primary and secondary winding. Depending on the application, that portion of the winding used solely in the higher-voltage (lower current) portion may be wound with wire of a smaller gauge, though the entire winding is directly connected.

 
     
 

An autotransformer is usually lighter and less expensive than isolation type transformers. The autotransformer is a full sine wave transformer that can be used 24/7 with any type of AC (alternating current) appliance. An autotransformer does not change the frequency but can be used at either 50 Hz or 60 Hz.

These compact open-type copper transformers are Y-connected and are fitted with clearly labelled fiberglass terminal boards with solidly fixed connection studs for easy installation. Unlike the use of multiple unit buck-boost

 
 
   

arrangements, there is no complicated internal wiring necessary and no conversion charts to decipher.

As with all auto transformer installations, the loads are not isolated from the line source and caution should be exercised when there are electronics or computer controls present.

- Available in a full range of voltage combinations up to 300 KVA (1 PH / 2 PH / 3 PH).

Some Typical Applications

 
     
 

Perfect make Three Phase Auto Transformer provide a quick and simple way to convert standard supply voltages to those special voltages required by small loads and fractional motors.

  • Motor Starting Auto Transformers