Product Core Brief

• Model: ABB REM545BG227AAAB
• Brand: ABB
• Series: REL545 / REL500
• Core Function: Feeder overcurrent, earth-fault, and thermal protection
• Product Type: Numerical protection relay (IED)
• Key Specs: 1 A / 5 A CT input | 110–250 V AC/DC auxiliary | IEC 60870-5-103 support
• Condition: New Original (New Surplus)

Key Technical Specifications

• Product Platform: ABB REL500 / REL545 series
• Protection Functions:
  • 3-stage overcurrent (50/51)
  • Earth fault / residual current (50N/51N)
  • Thermal overload (49)
  • Negative sequence / phase imbalance (46)
  • Optional breaker failure supervision
  • Optional load shedding / interlocking logic
• Current Inputs: 1 A / 5 A CT selectable
• Auxiliary Supply: 110–250 V AC/DC wide-range
• Power Consumption: ~10–15 W typical
• Binary Inputs: 6–8 configurable channels
• Relay Outputs: 4–6 configurable trip/alarm relays
• Communication Protocols: IEC 60870-5-103; optional Modbus RTU
• Event Logging: 100+ events with timestamps
• Fault Recording: Disturbance recording via relay logic or firmware dependent
• HMI: Local front panel LEDs and navigation buttons
• Mounting: Flush panel / switchgear integration
• Operating Temperature: -25°C to +55°C
• Storage Temperature: -40°C to +70°C
• Compliance: IEC 60255 series, CE marking
• Firmware Version: Verify with OEM datasheet

  Important: The BG227AAAB suffix defines exact hardware, I/O, and protection function configuration. Confirm wiring, CT ratios, and auxiliary supply before installation.