Siemens Reyrolle 5 7SR51 Overcurrent & Feeder Protection Relay
The Siemens Reyrolle 5 7SR51 is a numerical protection relay providing advanced overcurrent and feeder protection with integrated IEC 61850 Ethernet communication and enhanced cybersecurity. Designed for modern substations and industrial power systems, it combines flexible configuration, user-friendly interface, and reliable performance
Technical Specifications
Multiple I/O configurations (from 4 CT + 8 BI + 6 BO up to 4 CT + 4 VT + 39 BI + 20 BO)
Standard IEC 61850, DNP 3.0, MODBUS-RTU, IEC 60870-5-103 protocols
Withdrawable design, 6U or 12U housing
128×128 LCD graphical display with mimic diagrams
Protection Functions: 50/51 Overcurrent, 50N/51N Earth Fault, 46 Negative Sequence, 49 Thermal Overload, 50BF Breaker Failure, 81 Frequency, 87GH/NL REF, 67 Directional OC and EF, 25 Synchrocheck, 21 Fault Locator, etc.
Monitoring of currents, voltages, power, energy, frequency and event/waveform recording
USB front port, RS485, RJ45 or Optical Ethernet rear ports
Applications: Feeder, Backup Protection, Transformer, Generator and Busbar Protection
Standard IEC 61850, DNP 3.0, MODBUS-RTU, IEC 60870-5-103 protocols
Withdrawable design, 6U or 12U housing
128×128 LCD graphical display with mimic diagrams
Protection Functions: 50/51 Overcurrent, 50N/51N Earth Fault, 46 Negative Sequence, 49 Thermal Overload, 50BF Breaker Failure, 81 Frequency, 87GH/NL REF, 67 Directional OC and EF, 25 Synchrocheck, 21 Fault Locator, etc.
Monitoring of currents, voltages, power, energy, frequency and event/waveform recording
USB front port, RS485, RJ45 or Optical Ethernet rear ports
Applications: Feeder, Backup Protection, Transformer, Generator and Busbar Protection
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