This article examines turnkey solutions for automatic transfer switch (ATS) systems on circuit breakers using the ATS021, ATS022, and ATS500 units. It details the functionality of the ATS021 and ATS022 units and the ATS circuits implemented using them, and provides examples of 2-in-1 and 2-in-2 circuits from the ready-made solutions collection. An overview of the ATS500 solution for implementing more complex ATS circuits (3-in-1, 3-in-2, etc.) is provided.