Overview

The ABB REB611 is a modern busbar protection relay designed for single busbar applications in utility substations and industrial power systems. It provides fast fault detection and secure isolation, ensuring reliable operation of critical electrical infrastructure. Moreover, the relay integrates advanced communication protocols such as IEC 61850, enabling seamless interoperability with digital substations. In addition, the REB611 is delivered preconfigured and factory‑tested, reducing engineering time and simplifying commissioning.

This relay belongs to ABB’s Relion® 611 series, known for dependable protection and control solutions. Therefore, it is trusted by utilities and industries worldwide to safeguard busbars, transformers, and associated equipment against short‑circuits and earth‑faults.

Technical Data

Typical Applications

• Protection of single busbars in utility substations where reliability is critical.

• Restricted earth-fault protection for transformers, motors, and reactors in industrial plants.

• Backup protection relay in multipurpose applications requiring dependable fault detection.

• Integration into digital substations with IEC 61850 communication and redundancy protocols.

• Retrofit projects replacing older electromechanical relays with modern numerical solutions.

FAQ

Q1: What is the ABB REB611 used for?
A1: It protects and supervises single busbars, ensuring fast fault detection and isolation.

Q2: Can REB611 be applied beyond busbar protection?
A2: Yes, it also provides restricted and residual earth-fault protection for transformers, motors, and reactors.

Q3: How does REB611 simplify commissioning?
A3: It is delivered preconfigured and factory-tested, reducing engineering effort and setup time.

Q4: What communication protocols are supported?
A4: REB611 supports IEC 61850 and redundancy protocols such as HSR and PRP for reliable communication.

Q5: Is REB611 part of a larger product family?
A5: Yes, it belongs to ABB’s Relion® 611 series, which includes relays for feeder, transformer, and motor protection.