A circuit for dynamically increasing the drop-out voltage of an electromechanical automatic transfer switch (ATS) into a brownout voltage range is provided. The automatic transfer switch includes a first input, a first coil connected to the first input, and a first, normally-open auxiliary contact in magnetic communication with the first coil. The circuit includes a first resistor adapted to connect to the first, normally-open auxiliary contact, and a first transformer having a primary winding connected to the first resistor, and a secondary winding adapted to connect to the first coil. An operating voltage across the first coil is reduced a proportional amount by a secondary voltage across the secondary winding when the first, normally-open auxiliary contact is closed.