... 12.5mm), complying with standard JB/T7121-1993 Have CE certificate Class 1 three phase meter MB421GC,energy meter,watt-hour ... or 6+1 digits display, users can choose any one by themselves form far infrared or port of RS485 communication. Standard configuration one ... IEC 62053-23. Standard configuration type S wiring (Inlet from top, outlet from bottom), directly connect operation, may select use CT ( ...