... 3. Good operation functions. Model: YD4E-9S4Function1). Measurement: U, I, P, Q, PF, F, EP all power parameter.2). Class ... -RTU protocol.Technical ParameterAccuracyU,I 0.2 class, P,Q 0.5 class, Active electric energy 0.5 ... Reactive electric energy 2 classDisplayLED / LCD DisplayNetworkThree Phase Three Line, Three Phase Four LineInputmeasurementVoltageRated valueAC 100V,AC 400VOverloadingContinuance:1 ...