Technical Specifications Definite‑time and inverse‑time over‑current protection, sensitive earth‑fault protection. Fixed analog current input channels, configurable binary input and binary output channels. Supports Modbus and IEC60870‑5‑103 communication protocols. Auxiliary power supply 80‑250 V DC / 85‑265 V AC. Typical power consumption 8.5 W. Operating temperature ‑25 ℃ to +55 ℃, storage temperature ‑40 ℃ to +85 ℃, non‑condensing relative humidity 5%‑95%. Front‑panel IP40, rear side IP20. Meets CE and IEC relay standards.
Functional Features Implements multi‑stage over‑current and earth‑fault protection for distribution feeders. Records fault current values and fault event logs. Front‑panel keys and display realize local parameter configuration. LED indicators show power, operation, trip and alarm status. Built‑in hardware self‑diagnosis monitors internal operating status.
Application Scenarios Installed inside medium‑voltage switchgear cabinet. Used for simple feeder protection in utility substations and general industrial power distribution systems. Applied for reconstruction projects of old‑style electromagnetic relays.
Performance Parameters Protection action time conforms to distribution network protection standards. Fault log stores latest fault records. Measurement accuracy meets basic protection monitoring requirements. Hardware failures trigger clear alarm output.
Material Composition Multi‑layer glass‑fiber epoxy printed circuit board. Industrial signal acquisition and processing chips. Gold‑plated spring‑type connection terminals. Front‑panel HMI assembly with small LCD and operation keys. Flame‑retardant plastic‑metal composite housing. Copper‑alloy internal contact connectors.
Installation Requirements Fasten device inside medium‑voltage switchgear cabinet. Connect auxiliary power supply within rated operating range. Wire CT and binary loops strictly following engineering schematics. Deploy communication cables for remote monitoring. Download protection settings by engineering tool. Complete protective grounding according to power industry specifications. Verify LED indication status after power‑on.
Usage Notes Apply anti‑static protection measures before contacting internal circuit boards. Comply with high‑voltage safety rules for CT secondary circuit operations.
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