... Combined Digital Panel Meter measures and displays real time AC phase voltage, line voltage, and current with LED display in ... RS485,YD9122:3 phase current, voltage input, 4 bits display + one relay contact output,YD912A:3 phase current, voltage input, 4 ... bits display +one RS485 + one passive contact input + one relay contact output.PerformanceStandard compliance: GB/T ...