Product Core Brief
- Model: ABB REJ603BB401NN31E
- Brand: ABB
- Series: REJ603 / Relion 600
- Core Function: Feeder overcurrent and earth-fault protection
- Product Type: Self-powered numerical protection relay (IED)
- Key Specs: CT self-powered | 1 A / 5 A CT input | IEC 60870-5-103
- Condition: New Original (New Surplus)
Key Technical Specifications
- Product Platform: ABB Relion REJ603 series
- Power Supply: Self-powered via CT energy harvesting
- Protection Functions:
- 3-stage overcurrent (50/51)
- Earth fault protection (50N/51N)
- Thermal overload (49)
- Optional transformer inrush restraint
- Optional circuit breaker failure
- CT Inputs: 1 A / 5 A selectable
- Binary Inputs: 1–2 configurable channels
- Relay Outputs: 1–2 configurable trip outputs
- Communication Protocols: IEC 60870-5-103; Modbus RTU optional
- Event Logging: Limited storage for protection events
- Fault Recording: Disturbance recording via LEDs and relay contacts
- Protection Characteristics: IEC 60255 IDMT & definite time
- Mounting: Flush panel / RMU integration
- Operating Temperature: -25°C to +55°C
- Storage Temperature: -40°C to +70°C
- Compliance: IEC 60255 | CE marking
- HMI: Local front-panel LEDs and status indicators
Note: BB401NN31E defines specific hardware, I/O configuration, and communication variant. Confirm exact wiring and function maps with ABB documentation before replacement.
Product Introduction
ABB REJ603BB401NN31E is a self-powered numerical feeder protection relay used in medium-voltage distribution systems, including ring main units (RMUs) and compact substations. It provides overcurrent, earth-fault, and thermal overload protection without the need for an external auxiliary supply, making it ideal for isolated or retrofit installations.
The relay supports IEC 60255 time-current protection characteristics and communicates via IEC 60870-5-103. The BB401NN31E variant ensures a defined I/O mapping and energy harvesting configuration. New Surplus units undergo full QC, including insulation resistance testing, functional I/O verification, and event logging validation to ensure proper operation in live distribution networks.
