Parameters Category Parameter Specification / Value for REF615E_G General Product Level "E" (Enhancement) Hardware Variant _G (Graphic Display & Enhanced Keypad) Standard IEC 60255, IEC 61850, IEEE C37.90 Power Supply Operational Voltage Ranges Typically: 24-48 V DC / 48-110 V DC / 110-250 V DC or 110-230 V AC (Ordering code specific) Inputs Current Inputs (I_n) 1 A or 5 A (hardware dependent) Voltage Inputs (U_n) 100-120 V or 190-230 V line-to-neutral (via VT) Binary Inputs (BI) Typically 16 (configurable in groups for different voltage levels) Outputs Output Relays Trip/Close (PO): Typically 6 Signal (BO): Typically 8 Human-Machine Interface Display Large, high-resolution Graphical LCD Local Control Enhanced keypad for full navigation and control Communication Primary Protocol IEC 61850-8-1 (MMS & GOOSE) Serial Protocols IEC 60870-5-103, Modbus RTU Optional Protocol DNP3 (serial or Ethernet) Physical Ports 1 x Electrical Ethernet (RJ-45), 1 x Optical Ethernet (ST), 2 x RS485 Protection Functions (Key ANSI) Overcurrent 67/67N (Dir. OC/EF), 50/51 (Inst./Time OC), 50N/51N (Inst./Time EF), 50BF (CB Fail) Other Protection 27 (Undervoltage), 59 (Overvoltage), 49 (Thermal O/L), 79 (Autorecloser), 81U/f (FreQ), 46 (Unbalance) Environmental Operating Temperature Standard: -25°C to +70°C Housing & Mounting Compact, IP40/IP52 rated, for panel mounting.