The Phase change over can only is installed with three-phase supply. This kit automatically gives output of all the three phase either one or two phases are missing, and after the return or present of all three phase it diverts automatically to its originating phase.
This project is also a proto-type to automation of the system. In the earlier days (even today at some places) the manual operations are frequent. This kit is a prototype for the same which is auto change over to generator when main supply fails