Parameters Category Parameter Specification / Interpretation for 1SDA051369R1 General Functional Model REF615 / RET615 Feeder or Transformer Protection Relay Product Line Relion® 615 Series Hardware Level "C" or "E" Level (Control/Enhancement - inferred from capabilities) Power Supply Operational Voltage Likely 110-250 V DC or 110-230 V AC (Order code specific). Analog Inputs Rated Current (In) 1 A or 5 A (secondary, defined by order code). Thermal Withstand Continuous: 4 x In; 1s: 100 x In. Voltage Inputs 100-120V or 190-230V line-to-neutral (via VT). Digital I/O Binary Inputs (BI) Typically 16 (configurable voltage groups). Output Relays Typically 6-8 Trip/Close relays (PO) + 8 Signal relays (BO). HMI Display Graphical LCD (high-resolution). Interface Front keypad, navigation buttons. Communication Primary Protocol IEC 61850-8-1 (Edition 2) Included Protocols DNP3 (TCP/IP & Serial), Modbus RTU, IEC 60870-5-103. Physical Ports 2 x Ethernet (RJ45 + ST optical), 2 x RS485. Protection Functions Core ANSI Functions 50/51/67 (Phase OC), 50N/51N/67N (Earth Fault), 27/59 (Voltage), 79 (Recloser), 49 (Thermal), 50BF (CB Fail). Metering Measurements I, V, P, Q, S, PF, F, Energy (Wh, varh) – Class 0.5/1.0. Power Quality Harmonics (THD), unbalance. Recording Disturbance Recorder Oscillographic (≥ 8 analog channels, 128 samples/cycle). Event Log (SOE) ≥ 1024 time-tagged events. Logic Programmability CFC (IEC 61131-3) & Sequence Control. Environmental Operating Temperature -25°C to +70°C (standard). Protection Degree IP40/IP52 (panel mounted). Standards Compliance IEC 60255, IEC 61850, IEEE C37.90, IEC 61000-4 (EMC).