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Product Description

The ABB REJ603BB401NN31E is a self-powered feeder protection relay designed for medium-voltage distribution networks. It draws operating power directly from current transformers (CTs), eliminating dependence on external auxiliary supply. Therefore, it ensures reliable protection even in remote or backup installations where power may be limited.

Compact and robust, the relay integrates a local human-machine interface (HMI), providing intuitive push-button configuration, event monitoring, and clear LED fault indication. Moreover, its multi-function protection capabilities safeguard feeders against overcurrent, short-circuit, and earth-fault conditions.

Engineered for industrial and utility environments, the REJ603BB401NN31E allows seamless integration into switchgear panels. Its built-in self-supervision continuously monitors hardware and software, reducing maintenance needs and enhancing operational reliability. In addition, optional communication interfaces support remote monitoring and control, improving system visibility.

​Key Features

• Self-powered operation: Operates independently without external auxiliary supply.
• Integrated HMI: Local push-button control and LED status indicators.
• Comprehensive protection: Overcurrent, earth-fault, and thermal overload functions.
• Compact and robust: Easy panel mounting, suitable for medium-voltage environments.
• Event recording: Fast diagnostics with clear fault indication.
• Flexible communication: Optional serial or Ethernet connectivity for remote monitoring.
• Continuous self-supervision: Ensures reliable hardware and software operation.

Technical Specifications

• Model: REJ603BB401NN31E
• Series: Relion® 605
• Type: Self-powered feeder protection relay
• Power Supply: Derived from CTs, no external supply required
• Frequency: 50 Hz / 60 Hz
• Protection Functions:
  • Non-directional overcurrent (three-phase)
  • Earth-fault protection
  • Thermal overload protection
  • Trip circuit supervision
• Inputs/Outputs: Binary I/Os for control and signaling, LED status indicators
• Communication: Optional serial/Ethernet interfaces
• HMI: Local push-buttons and LEDs
• Self-supervision: Continuous monitoring of relay hardware and software
• Dimensions: 160 mm × 151.4 mm × 130 mm
• Weight: 1.43 kg
• Mounting: Panel-mounted
• Compliance: IEC standards for protection relays

Typical Applications

• Medium-voltage distribution feeders in utilities and industrial plants
• Backup protection for substations and switchgear systems
• Remote or rural installations without auxiliary power availability
• Industrial power systems requiring reliable feeder protection

FAQ

Q: How does self-powered operation work? A: The relay draws energy directly from current transformers, removing reliance on external supply.

Q: Can this relay be used for remote monitoring? A: Yes, optional serial or Ethernet interfaces enable integration with SCADA or other automation systems.

Q: What types of faults does this relay detect? A: It protects against three-phase overcurrent, earth faults, thermal overloads, and monitors the trip circuit.

Q: Is it suitable for compact switchgear panels? A: Yes, its compact design allows easy panel installation while maintaining robust protection.

Q: Does it include event recording? A: Yes, all critical events are recorded, allowing fast diagnostics and system analysis.