CPS SCA20/25/30KTL-DO and SCA36KTL-DO grid-tied PV inverters are transformerless, three phase products. The maximum input voltage is 1000V which makes he configuration more flexible. Patented 3-level control algorithm and thermal design provide 98.6% maximum efficiency and 98.1% Euro efficiency. This type three phase string inverters are design with the DC switch integrated. And provide a standard for fuse which designed in the wiring box. Integrated PV input string fault detection circuit and PV input arcing fault detection circuit to ensure the safety.