The MiCOM P121 is an overcurrent and earth fault protection relay with a standard display. It provides overcurrent protection per ANSI 50/51, earth fault protection per ANSI 50G/51G, and lockout and restricted earth fault protection per ANSI 86 and 64REF. It has 2 discrete inputs, 4 current inputs, and 5 discrete outputs. Communication protocols supported include IEC 60870-5-103, DNP3, and Modbus RTU.