Abstract: An automatic transfer switch (ATS) controller is disclosed which includes a power supply circuit to regulate and filter input power, a transformer to convert utility and generator power sources into power supply voltages and voltage sensing sources and a voltage sense signal conditioning circuit. Controller further implements a solenoid driver circuit to drive automatic transfer switch solenoids, an embedded microcontroller configured to monitor utility and generator voltages and a user interface interfaced to said microcontroller for operator entry of instructions. A LED indicator is included and is configured to verify user interface entries and overall operation of the controller and ATS system.

Abstract: A simplified mechanical and electromechanical interlock system connecting automatic transfer and bypass/isolation switches in a bypass/isolation automatic transfer switch is provided, whereby the risk of hazard resulting from the misconnection of power sources through automatic transfer and bypass/isolation switches is reduced by prevention of closure of the two switches into opposite or dead sources is prevented. Related retractable table structure is also provided for moving the automatic transfer switch from a frame in which the switches are housed.