Phase change switch type three - phase unbalance correction device compose by the main controller and phase converter. The main controller is responsible for collecting the real-time load data of the transformer area; analyze the load voltage and current of each phase converter; Form and send command to the phase converter. The phase converter receives and executes command from the main controller. 1.Model: ETCR5500 2.Phase Change Time: 0ms 3. Communication Mode: 230MHz wireless communication;GPRS,RS485 4. Rated Voltage: Between Phase 380V/ phase zero 220V 5. Rated Frequency: 50Hz,allowable deviation:±5% 6. Power Consumption: ≤2.5W