Micro Controller based Three Phase Ammeter is designed to provide True RMS Measurement and operates with an accuracy level of Class 0.5. The Three Phase Ammeter is provided with a current transformer that is used as a current transducer for durability. The Three Phase Ammeter works on an auxiliary supply of 230V + 20% / 110V + 20% AC. Micro Controller based Three Phase Ammeter is provided with a three row 4-digit bright red seven segment display.