An Automatic Changeover Panel performs the function of automatically switching the connected load between mains and genset (or any two power sources) in a specified manner, with mains as the first priority. •During a healthy mains supply, the load is drawn from mains only. •When the main supply fails and the standby genset is on, the panel automatically connects the load to the generator. •When the main supply resumes, the connected load is automatically shifted back to mains.