... IEC62053-21. ApplicationType DTSY833 three-phase electronic prepayment electric energy ... :Three-phase three-wire: 3x100V,50Hz,3x1.5(6)A,3X3(6)A.Three-phase ... four-wire:3x220V,50Hz,3x1.5(6)A,3X3(6)A,3x3(6)A,3X5(20)A,3x10(40)A,3x20(80)A ... .Service conditions: Ambient temperature-20~+50°C.Relative humidity:≤85%.Option of RS485. Three Phase ...