An isolation transformer is one whose input windings and output windings are electrically isolated, permitting its use in transforming alternating current (AC) electrical power from one side to the other while avoiding accidental contact with charged objects.

An Auto Transformer is a type of transformer that uses a single winding to perform both the functions of a primary and secondary winding. In an autotransformer, a portion of the winding is shared between the primary and secondary circuits.

A Control Transformer is an isolation transformer that provides good voltage regulation, and is also designed to provide a high degree of secondary voltage stability (regulation) during a brief period of overload condition (also referred to as “inrush current”).

A Current Transformer is specially made to provide a current in its secondary that is approximately proportional to the current flowing in its primary. Current Transformer (CT) has a lot of performance specifications which includes primary and secondary current, insulation voltage, VA burden, and accuracy class