ABB REJ603 REJ603BBB10NN3XB Relay Module

The ABB REJ603 (Model Code: REJ603BBB10NN3XB) is a compact and intelligent feeder protection relay module engineered for secondary distribution networks. It is part of ABB’s Relion® 600 series, a line of protection and control devices developed for the smart grid environment. Designed to meet utility and industrial requirements for reliability, selectivity, and simplicity, the REJ603 offers essential protection, control, monitoring, and communication functions in one space-efficient unit.

The relay is especially optimized for low and medium voltage applications and offers proven protection performance with minimal wiring and fast installation. With IEC 61850 compatibility, the REJ603 integrates seamlessly into modern digital substations and offers future-proof system expansion capabilities.

Product Specifications

Product Applications

The REJ603 relay module is used extensively in low and medium-voltage secondary distribution systems, both in utility and industrial environments:

• Utility Substations: Feeder protection in medium-voltage switchgear

• Industrial Facilities: Motor and feeder protection for process industries

• Renewable Energy Plants: Solar and wind substation feeder protection

• Commercial Buildings: Panel-mounted protective relays for backup feeders

• Data Centers: Reliable circuit protection for critical power feeds

• Transportation Infrastructure: Electrified rail and airport substation protection

Product Advantages

• Compact Design for Panel Installation

  Space-saving housing ideal for retrofit and new installations in MV switchgear panels.

• IEC 61850 Communication Ready

  Enables advanced interoperability and fast GOOSE messaging in digital substations.

• Simple Configuration and Commissioning

  Predefined logic and setting templates minimize engineering time and errors.

• Reliable Feeder Protection

  Built-in functions such as overcurrent, earth fault, and thermal overload protection ensure system stability.

• Versatile Mounting and Flexible I/O

  Front panel or DIN rail mounting with programmable I/Os for adaptation to system needs.

• Event Logging and Disturbance Recording

  Captures operational data and fault records for diagnostics and post-event analysis.

Frequently Asked Questions (FAQ)

1. What is the primary function of the REJ603 relay?

   The REJ603 is designed to provide feeder protection in low and medium-voltage power distribution systems.

2. Does REJ603 support IEC 61850 communication?

   Yes, the relay is fully IEC 61850 compliant, supporting GOOSE messaging and interoperability.

3. Can the relay operate on both AC and DC auxiliary supplies?

   Yes, it supports universal voltage inputs ranging from 100–250 V AC/DC.

4. What type of mounting does REJ603 support?

   It can be mounted flush on a panel or on a DIN rail using an adapter.

5. Is it suitable for harsh environments?

   Yes, the front is rated IP54 for dust and splash protection; operating range is -10°C to +55°C.

6. What protection functions are included?

   Overcurrent (50/51), Earth fault (50N/51N), Thermal overload, and breaker failure detection.

7. How many binary inputs and outputs are available?

   The REJ603 comes with 4 binary inputs and 5 binary outputs, configurable via software.

8. Can the device store fault records?

   Yes, it has non-volatile memory for event recording and disturbance analysis.

9. Is Modbus supported in this relay?

   Yes, both Modbus RTU and Modbus TCP/IP protocols are supported.

10. Does it support remote access or configuration?

    Yes, settings and event logs can be accessed remotely over Ethernet or serial connection.