Siemens Reyrolle 7SR120 Relay – Overcurrent and Feeder Protection
The Siemens Reyrolle Argus 7SR120 Directional Protection Relay is a numerical, high-performance device designed for directional overcurrent (OC) and earth fault (EF) protection. With its reliable 1/4xI and 3xV inputs, it ensures accurate monitoring, fault detection, and selective tripping in industrial, utility, and commercial networks
Technical Specifications
Model: 7SR120 Argus
Function: Directional overcurrent & earth fault protection
Inputs: 1/4xI and 3xV
Power Supply: Universal AC/DC
Communication: USB (front), RS485 (rear) – MODBUS RTU / IEC 60870-5-103 / DNP3.0
Display: LCD screen with menu navigation
Mounting: Non-draw-out, size 4 case
Protection Functions:
Undercurrent (37) • Broken Conductor (46BC) • Negative Phase Sequence Overcurrent (46NPS) • Thermal Overload (49) • Overcurrent (50, 51) • Earth Fault (50G, 50N, 50SEF, 51G, 51N, 51SEF) • Directional OC & EF (67) • High Impedance REF (64H) • Under/Over Voltage (27/59) • Negative Phase Sequence Voltage (47) • Voltage Controlled Overcurrent (51V) • Neutral Voltage Displacement (59N)
Supervision Functions:
CT Supervision (60CTS) • VT Supervision (60VTS) • Trip & Close Circuit Supervision (74T/CCS) • Inrush Detector (81HBL2) • Circuit Breaker Fail (50BF)
Control Functions:
Auto Reclose (79)
Monitoring Functions:
Phase & Earth Currents • Line Voltages • Apparent, Real & Reactive Power • Power Factor • W Hr & VAr Hr (Forward/Reverse) • PPS/NPS/ZPS Voltages and Currents • Historical Demand Records
Main Features:
Cold Load Settings • Four Setting Groups • 2-Level Password Protection • Programmable Logic • Self Monitoring • CB Trip Counter • Fault/Event/Waveform Records
Function: Directional overcurrent & earth fault protection
Inputs: 1/4xI and 3xV
Power Supply: Universal AC/DC
Communication: USB (front), RS485 (rear) – MODBUS RTU / IEC 60870-5-103 / DNP3.0
Display: LCD screen with menu navigation
Mounting: Non-draw-out, size 4 case
Protection Functions:
Undercurrent (37) • Broken Conductor (46BC) • Negative Phase Sequence Overcurrent (46NPS) • Thermal Overload (49) • Overcurrent (50, 51) • Earth Fault (50G, 50N, 50SEF, 51G, 51N, 51SEF) • Directional OC & EF (67) • High Impedance REF (64H) • Under/Over Voltage (27/59) • Negative Phase Sequence Voltage (47) • Voltage Controlled Overcurrent (51V) • Neutral Voltage Displacement (59N)
Supervision Functions:
CT Supervision (60CTS) • VT Supervision (60VTS) • Trip & Close Circuit Supervision (74T/CCS) • Inrush Detector (81HBL2) • Circuit Breaker Fail (50BF)
Control Functions:
Auto Reclose (79)
Monitoring Functions:
Phase & Earth Currents • Line Voltages • Apparent, Real & Reactive Power • Power Factor • W Hr & VAr Hr (Forward/Reverse) • PPS/NPS/ZPS Voltages and Currents • Historical Demand Records
Main Features:
Cold Load Settings • Four Setting Groups • 2-Level Password Protection • Programmable Logic • Self Monitoring • CB Trip Counter • Fault/Event/Waveform Records
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