ABB REJ603BB401NN31E Feeder Protection Relay

Product Description

The ABB REJ603BB401NN31E is a self-powered feeder protection relay from the Relion® 605 series. It safeguards medium-voltage feeders against overcurrent and earth faults while providing reliable monitoring and control functions. This relay operates independently without requiring an external auxiliary power supply, making it ideal for retrofit and remote installations. Its compact design and integrated local HMI with LED indicators allow quick status checks and seamless integration into existing panels.

Moreover, the REJ603BB401NN31E ensures continuous internal supervision and high operational reliability, minimizing downtime in industrial and utility distribution networks. Built-in testing functions simplify commissioning and maintenance, while binary inputs and outputs support flexible control and signaling. This relay delivers essential feeder protection functions with robust industrial-grade dependability, supporting both utilities and industrial systems.

Key Features

• Self-Powered Operation: Operates directly from current transformers, eliminating external power dependency.

• Compact Design: Lightweight and small footprint enables efficient panel integration.

• Integrated HMI: Local interface with LEDs and optional flag indication for rapid diagnostics.

• Reliable Protection: Overcurrent and earth-fault protection ensure system safety.

• Continuous Supervision: Internal monitoring with alarms improves operational reliability.

• Flexible Connectivity: Binary inputs and outputs support signaling and control applications.

• Built-in Testing: Commissioning and maintenance simplified with automated test functions.

Technical Specifications

• Power Supply: Self-powered from CTs, no external auxiliary supply needed

• Frequency: 50 Hz

• Protection Functions:

• Non-directional overcurrent protection

• Earth-fault protection

• Trip circuit supervision

• Inputs/Outputs:

• Binary inputs and outputs for control and signaling

• CT inputs for measurement and power supply

• Self-Supervision: Continuous internal monitoring with alarm indication

• Testing: Built-in test functions for commissioning and maintenance

• Physical Dimensions:

• Height: 160 mm

• Length: 151.4 mm

• Width: 130 mm

• Weight: 1.43 kg

Typical Applications

• Medium-voltage distribution substations

• Industrial power systems requiring robust feeder protection

• Utility feeder protection networks

• Remote or retrofit installations where external power supply is limited

FAQ

Q1: Does the REJ603BB401NN31E require an external power supply?
A1: No, the relay is self-powered through current transformers, eliminating auxiliary power dependency.

Q2: Can the relay provide diagnostic information locally?
A2: Yes, it features an integrated HMI with LED indicators and optional flag signaling.

Q3: Is this relay suitable for industrial and utility networks?
A3: Absolutely, it supports both industrial feeders and utility medium-voltage networks with high reliability.

Q4: How can I test the relay during maintenance?
A4: The relay includes built-in testing functions that simplify commissioning and routine checks.