Siemens 7SR110 Nondirectional Overcurrent Protection Relay | Reyrolle
The Siemens 7SR110 is a versatile non-directional overcurrent protection relay. It provides flexible settings for current and time grading, ensuring compatibility with various overcurrent protection schemes. It supports advanced communication, integrated logic, metering, supervision, and monitoring features, making it reliable for modern power systems
Technical Specifications
Single and four pole variants (E4 case); IEC 61850 option (E6 case)
Cold load settings
Four settings groups
Password protection (2 levels)
User programmable logic, self-monitoring
CB trip counter & timer
Fault, event, and waveform records
Protection functions: Overcurrent (50/51), Earth fault (50G/51G), Thermal overload (49), Broken conductor (46BC), NPS overcurrent (46NPS), Voltage protection (27/59/47/59N), Voltage-controlled OC (51V), REF (64H), Directional OC & EF (67)
Supervision: CT (60CTS), VT (60VTS), Trip/Close circuits (74T/CCS), Inrush detector (81HBL2), CB fail (50BF)
Control: Auto-reclose (79)
Monitoring: Currents, voltages, power, energy (Wh, VArh), demand records, PPS/NPS/ZPS
Cold load settings
Four settings groups
Password protection (2 levels)
User programmable logic, self-monitoring
CB trip counter & timer
Fault, event, and waveform records
Protection functions: Overcurrent (50/51), Earth fault (50G/51G), Thermal overload (49), Broken conductor (46BC), NPS overcurrent (46NPS), Voltage protection (27/59/47/59N), Voltage-controlled OC (51V), REF (64H), Directional OC & EF (67)
Supervision: CT (60CTS), VT (60VTS), Trip/Close circuits (74T/CCS), Inrush detector (81HBL2), CB fail (50BF)
Control: Auto-reclose (79)
Monitoring: Currents, voltages, power, energy (Wh, VArh), demand records, PPS/NPS/ZPS
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