ATS (Automatic Transfer Switch Equipment) mainly is composed of switch body and intelligent transferring controller. It can transfer reliably between Normal power and Reserve power automatically when there is problem with any of them, meanwhile, it can monitor and protect the two power system by over voltage, under voltage, phase loss, short circuit, overload, the Reserve power can be Utility, Generator Power, UPS power, PV panel etc, and the main application can be hospital, shopping mall, bank, mechanical industry, metallurgy, high building, and fire control etc. places where the power should not be interrupted.