ABB REJ603BB401NN3XE REJ603 | Relion 605 Series

Product Overview

The ABB REJ603BB401NN3XE (also known as the REJ603E) is a specialized self-powered feeder protection relay within the Relion® 605 series. It is specifically engineered to protect medium-voltage feeders from overcurrent and earth faults in utility and industrial distribution networks. 

Technical Specifications

• Model Designation: REJ603BB401NN3XE / REJ603E

• Series: Relion 605

• Power Supply: Self-powered from CT secondary current (no auxiliary supply required)

• Rated Frequency: 50 Hz

• Protection Functions:

• Non-directional Overcurrent Protection (High and Low set stages)

• Non-directional Earth-fault Protection

• Trip Circuit Supervision

• I/O Configuration: Binary inputs and outputs for external control and signaling

• Diagnostics: Integrated LED indicators and mechanical trip flag

• Maintenance: Continuous internal self-supervision with fault alarms

• Mounting: Compact flush-mount design for panel integration

Engineering & Operational Advantages

• Autonomous Reliability: By operating independently of external power, the REJ603E ensures that protection logic is functional even during total station blackouts, provided there is current flow.

• Reduced Lifecycle Costs: The absence of auxiliary power requirements means fewer cables, no battery maintenance, and simplified station design, leading to lower Total Cost of Ownership (TCO).

• Rapid Diagnostics: The combination of electronic LEDs and a permanent mechanical trip flag ensures that maintenance teams can identify the cause of a trip (overcurrent vs. earth fault) instantly upon arrival at the site.

• Internal Supervision: The relay performs constant self-checks on its internal hardware and software, triggering an alarm if an internal fault (IRF) is detected, thereby preventing silent failures.

• Easy Commissioning: Built-in test functions allow for the simulation of trip conditions, significantly speeding up the commissioning and periodic maintenance process.