3-Phase AC Voltage/Current Combined Panel Meter 1. 4 digits+ LED diaplay 2. RS485 port. 3-phase AC Voltage / Current Combined Panel Meter ... display + one RS485,YD9122:3 phase current, voltage input, 4 bits display + one relay contact output,YD912A:3 phase current, voltage input, 4 ... by internal power power supply: 1.AC220V±15% ,50/60Hz, ≤1.5VA, 2. AC85~265V or DC85~330V(Customized)Working frequency ...