... surge protector photovoltaic power system surge protection deviceTNT-S40 DC surge protective device, protect against lightning ... thermal disconnectors and related failure indicators.LT-S40 DC is module design, with the characteristics ... : 500,800 and 1000Vdc. Technical data:ItemsTNT-S40 DCNetwork voltage Un500Vdc800Vdc1000VdcMax. operating voltage Uc620Vdc1000Vdc1060VdcNominal discharge current ...