... Digital Single phase electrical voltmeter ampere meter ,with analog output , RS485 interface With three display window , and can display voltage ... Dielectrical strength: Power supply terminals& other terminals, and Relay output terminals & other terminals: AC1800V, Leak Current 0.5mA,60S ... ; Weak voltage signal terminals between each input and output , DC600V, Leak current 0.5Ma, 60S.10) ...