The automatic changeover switch controller governs the all system. It is about a programmable controller (in this case Be342) that continuously monitor the utility power, the backup generator and the engine. The Utility Power (or mains if you will) is wireless connected to the automatic changeover controller. The backup generator current sensors are wireless connected as well. The Generator Auto Start Module takes care to start the engine. The Changeover Switch is made of two contactors with embedded auxiliary contacts an interlock mechanism. The auxiliary relays drive the coils of the contactors and Auto Start module. Power Utility voage measurement is fed to Be342 controller wireless. Emergency switch and configurable inputs are directly connected to the controller.