ATyS C55 is a comprehensive ATSE controller designed to operate remotely controlled transfer switches across multiple technologies, including motorised switches such as the ATyS r, ATyS S, and ATyS d M, as well as circuit breakers and contactors. It enables automatic or remote-controlled transfer between power sources using fully configurable timers and operating thresholds. The controller supports a wide range of source configurations, including two transformers or one transformer combined with one or two generator sets, making it a flexible solution for diverse low-voltage power transfer applications.