The ABB REJ601 BD446NN1XG is a digital feeder protection relay from ABB’s Relion® 605 series, engineered for dependable protection, monitoring, and control of electrical distribution feeders in utility and industrial networks. It is specifically configured for overcurrent and earth‑fault protection, offering high reliability and flexibility for primary and secondary distribution applications.

Key Capabilities

Dedicated Feeder Protection: Designed to safeguard overhead lines, cables, and transformer feeder circuits against overcurrent and earth‑fault conditions.

Compact yet Powerful: Half‑rack width design fits space‑limited switchgear, making it suitable for medium voltage (MV) switchgear panels and distribution cabinets.

Strong Diagnostic Tools: Supports extensive event logging and self‑supervision functions to help operators troubleshoot and analyze faults.

Flexible I/O and Configuration: Local HMI and remote configuration options enable quick setup and field adaptability.

Technical Specifications

Highlights & Features

Multi‑Level Protection Functions: Combines multi‑stage overcurrent, two‑stage earth‑fault detection, and thermal overload functionality.

Universal Power Supply: Accepts both AC and DC auxiliary power, simplifying installation and integration across diverse infrastructures.

Event Recording: Keeps a timestamped event log to support detailed fault analysis and system diagnostics.

Remote Communication: Modbus RTU and IEC 60870‑5‑103 protocols allow connectivity with SCADA and control systems for real‑time monitoring and control.

Robust Mechanical Build: Designed for industrial environments with enhanced protection against interference and vibration, suitable for extended operation.

Typical Applications

Utility Distribution Networks: Protection of feeders in substations and distribution panels.

Industrial Power Systems: Safeguarding cable and overhead feeder circuits in factories, campuses, and plants.

Retrofit and Modernization Projects: Replacing or upgrading legacy relay solutions with modern digital protection.

Automation & SCADA Integration: Works with higher‑level automation systems for networked protection and monitoring.

Installation & Maintenance

The REJ601 BD446NN1XG features a press‑fit mounting mechanism for quick installation into compatible relay panels. Connector arrangements are designed for secure wiring and system organization. Maintenance is typically limited to periodic testing of protection functionality, verifying event logs, and ensuring communication integrity with supervisory systems.

Why Choose the ABB REJ601 BD446NN1XG?

Proven Protection: Built on the Relion® 605 platform, trusted in utility and industrial deployments worldwide.

Versatile Integration: Supports standard communication protocols for broad system compatibility.

User‑Friendly Commissioning: Local HMI and remote tools simplify setup and parameterization.

Compact Modular Design: Ideal for panels with limited space or high‑density relay arrangements.