 To reduce the risk of any voltage surge it is desirable to replace the Korndörfer motor starter circuit with an autotransformer that has a central switch circuit that disconnects redundant windings of the first starting stage from the circuit at the transition, thereby preventing any step-up transformer connection and voltage escalation.The root cause of destructive transients in Korndörfer starters, it is random switching of the changeover of motor current.The uncontrolled timing of the changeover allows the peak motor current to be switched at any point on the wave.