DIFFERENCE BETWEEN AUTOTRANSFORMER AND ISOLATION TRANSFORMER

AUTOTRANSFORMER

In an autotransformer, the input (or primary) and the output (or secondary) are electrically connected, while in an isolation transformer they are completely separated.

ISOLATION TRANSFORMER

Only a portion of the electrical energy is changed in an autotransformer, the remainder flowing directly between the primary and secondary.

In an isolation transformer, all the energy is transformed. For these reasons, an autotransformer is smaller, lighter and less costly than a comparable isolation transformer.