... 2,Un=500Vdc, Uc=620Vdc, In=20KA,Imax=40KA photovoltaic system spd1,photovoltaic power system (PV system) , DC 2,Un=500Vdc, ... device, protect against lightning surge voltages in solar system (photovoltaic power supply system).These units must be installed in parallel ... disconnectors and related failure indicators.LT-40/S DC is module design, with the characteristics of fast and easy maintenance in ...