Technical Specifications Rated Input Current: 1A / 5A selectable Rated Input Voltage: 120V AC Operating Auxiliary Power: 85‑264V AC, 88‑300V DC Protection Function Elements: Overcurrent protection, earth fault protection, over‑voltage protection, under‑voltage protection, negative sequence protection Communication Interfaces: RS485 serial port, Ethernet port Supported Communication Protocols: Modbus RTU, Modbus TCP, DNP3 Operating Temperature: ‑40℃ to +70℃ Storage Temperature: ‑50℃ to +85℃ Relative Humidity: 5%‑95%, non‑condensing Mounting Form: Cabinet front panel mounting Certifications: CE, UL, IEC60255 functional safety compliance
Functional Features Supports complete phase fault and ground fault protection element configuration for distribution feeder loop. Equipped with high‑precision electrical metering function for voltage, current, active power, reactive power and energy accumulation statistics.
Application Scenarios Medium‑voltage distribution feeder protection for utility power substations. Power safety monitoring for heavy‑industry factory internal power distribution system. Auxiliary power protection unit for thermal power generation facilities. Backup protection for medium‑voltage motor control circuit. 
Performance Parameters Protection trip action accuracy: ≤±2% of protection setting value Fault oscillography sampling rate: Maximum 64 samples per power cycle Historical fault event storage capacity: 1000 groups of event records Electrical measurement accuracy class: 0.5S grade Shock and Vibration Resistance: Complies with IEC60255 vibration standard for substation cabinet‑mount equipment Mean Time Between Failures.
Structural Characteristics Standard metal panel‑mount housing, compatible with SR750 series unified cabinet installation cut‑out dimension. Front panel integrated LCD display screen, physical operation push‑buttons and multi‑color LED status indicator lamps.
Working Principle Current and voltage analog signals output from field CT and VT access rear terminals of relay. Signal conditioning circuit converts raw analog signals into recognizable digital signals. Main processing unit continuously runs preset protection algorithm and user defined logic.
Installation Requirements Install the relay on flat front panel of standard electrical control cabinet with matched cut‑out dimension.
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