ABB REF611 – Feeder Protection Relay for Substation and Industrial Power Systems

The ABB REF611 is a compact and reliable feeder protection relay designed for the protection, control, measurement, and supervision of utility substations and industrial distribution systems. Part of the Relion® 611 protection and control series, REF611 is built to deliver high-performance fault detection and system reliability.

This versatile relay offers both directional and non-directional overcurrent and earth-fault protection, allowing it to be customized based on network configuration. Directional earth-fault protection is suited for isolated neutral or compensated networks, while non-directional protection is used in directly or low-impedance earthed systems.

As a member of ABB’s Relion® product family, REF611 supports modern grid automation standards and IEC 61850 communication, making it ideal for future-proof power protection systems.

✅ Key Features of ABB REF611 Feeder Protection Relay:

• Dedicated protection for feeders in utility and industrial networks

• Supports directional and non-directional earth-fault protection

• Compact design for easy panel integration

• Part of ABB’s Relion® 611 series

• Compliant with IEC 61850 for digital substation communication

• Ideal for both new installations and retrofit projects

⚙️ Typical Applications:

• Medium-voltage feeder protection

• Utility substations and industrial power systems

• Isolated neutral, compensated, or earthed networks

• Grid automation and smart protection systems