... 4.CE,ISO9001 5.OEM General IntroductionIC Card Prepaid Three Phase Electricity Meter adopts advanced RF card and SMT techniques, with double display, ... WorkshopModelDSSY---Three-phase three line, outside switchDTSY---Three-phase four line, outside switchDSSYK-Y---Three-phase three line, inside switchDTSYK-Y---Three-phase four line, inside switch IC Card Prepaid Three-Phase Electricity Meter