LYD4-20 whole house surge protector1.Solar system 2.High energy MOV3.Thermal discoonectors,failure indicator.LYD4-20 whole house surge protectoris suitably used in the IT, TT, TN-C, TN-S, TN-C-S and etc power supply system of AC 50/60Hz, rated voltage up to 380V, to protect from direct and indirect...