Parameters Category Parameter Typical Specification / Value Power Supply Operational Voltage 24-48 V DC / 48-110 V DC / 110-250 V DC or 110-230 V AC Current Inputs Rated Current (I_n) 1 A or 5 A (hardware specific) Thermal Withstand Continuous: 4 x I_n; 1 sec: 100 x I_n Voltage Inputs Rated Voltage (U_n) 100-120 V line-to-neutral or 190-230 V line-to-neutral (via VT) Binary Inputs (BI) Number Typically 16 (including 1 for CB position) Voltage 24-250 V DC / 110-230 V AC (configurable in groups) Output Relays (BO/PO) Trip/Close Relays (PO) Typically 6 (fast, high-breaking capacity) Signal Relays (BO) Typically 8 (general purpose) Communication Primary Protocol IEC 61850-8-1 (MMS & GOOSE) Serial Protocols IEC 60870-5-103, Modbus RTU Optional Protocols DNP3 (serial or over Ethernet) Ports 1 x Electrical Ethernet, 1 x Optical Ethernet (ST), 2 x RS485 serial Protection Functions Key ANSI/IEC Codes 67/67N (Dir. OC/EF), 50/51 (OC), 50N/51N (EF), 59 (OV), 27 (UV), 49 (Thermal), 46 (Phase Unbalance), 79 (Recloser), 81 (U/f), 50BF (CB Failure) Standards Compliance IEC 60255, IEEE C37.90, IEC 61000-4 (EMC), IEC 60870, IEC 61850