ABB REJ601 BD446NN1XG | New Surplus Protection Relay

Description

Product Overview

The ABB REJ601 BD446NN1XG is a numerical feeder protection relay designed for medium-voltage distribution networks, providing dedicated protection functions for utility substations and industrial power systems. As part of the ABB Relion 605 series, the relay combines feeder monitoring, protection, measurement, and control functions in a compact unit designed for switchgear applications. The ABB REJ601 BD446NN1XG is commonly applied in overhead line feeders, cable feeders, and transformer feeder protection where dependable fault detection and selective tripping are required.

The ABB REJ601 BD446NN1XG processes current transformer inputs to detect abnormal electrical conditions including phase overcurrent, earth faults, phase discontinuity, negative phase sequence conditions, and thermal overload situations. The relay includes preconfigured protection functions to simplify commissioning, while configurable binary inputs and outputs allow integration with circuit breakers and substation control schemes. Communication options such as Modbus RTU and IEC 60870-5-103 support connection with supervisory systems and automation equipment.

The ABB REJ601 BD446NN1XG is frequently selected for maintenance and lifecycle support of installed medium-voltage switchgear where replacing an entire protection scheme is unnecessary. Typical applications include industrial power distribution panels, feeder protection cabinets, and secondary distribution substations. Before replacement, engineers should confirm CT ratio settings, protection curves, auxiliary supply requirements, communication parameters, and existing relay configuration files. To be completely transparent, protection relays are configuration-sensitive devices; installing a matching hardware unit without restoring the correct protection settings can leave the feeder incorrectly protected.

Product Introduction (Non-Templated)

A feeder relay failure can remove critical protection from a distribution section even when the electrical equipment itself remains operational. The ABB REJ601 BD446NN1XG restores the protection interface responsible for detecting feeder faults and controlling trip decisions.

Built for medium-voltage distribution applications, this relay supports overcurrent and earth-fault protection, configurable I/O, and serial communication integration for existing switchgear maintenance and retrofit projects.

Key Technical Specifications

REJ601

Related Products

• ABB BD446BB1NH — Similar feeder protection relay variant with communication configuration differences. Used where Modbus or IEC communication is required in feeder applications.
• ABB BE446NN1XG — 5 A current input variant of the family. Selected when existing CT secondary circuits use 5 A ratings.
• — Related feeder protection and control relay. Provides similar feeder protection functions with additional breaker control capabilities depending on configuration.
• ABB REJ603 Series — Self-powered feeder protection relay family used for applications where auxiliary power availability is limited.
• ABB REM601 Series — Motor protection relay from the same 605 family. Designed for asynchronous motor protection rather than feeder protection.
• ABB REF615 Series — Advanced feeder protection relay platform with expanded automation functions for larger substations.
• ABB Relion 605 Series Configuration Software — Engineering software environment used for configuring compatible ABB 605 series protection devices.

Frequently Asked Questions (FAQ)

1. Is the ABB compatible with my existing medium-voltage switchgear?

Compatibility depends on the complete protection panel design.

Verify:

• CT secondary rating (1 A or 5 A)
• Auxiliary supply voltage
• Existing trip circuit wiring
• Communication protocol
• Relay mounting dimensions

The relay should match the original protection scheme before installation.

2. Can I hot-swap this?

No. The should not be replaced while energized.

Recommended replacement procedure:

1. Isolate the protection circuit
2. Record relay parameters
3. Disconnect wiring safely
4. Install replacement relay
5. Restore settings
6. Perform secondary injection testing

Protection equipment requires controlled commissioning after replacement.

3. Does the support firmware v3.1?

Firmware compatibility depends on the relay hardware revision and ABB configuration environment.

Check:

• Existing relay firmware version
• Configuration software version
• Parameter file compatibility
• Protection function availability

The firmware revision should match the installed substation requirements.

4. Will I lose my protection settings when replacing the ?

Yes, unless the original configuration is backed up.

Before replacement:

• Export relay settings
• Record CT ratios
• Save protection curves
• Document binary I/O assignments
• Backup communication parameters

After installation, reload and verify all protection values.

5. How can I verify a New Surplus ABB is authentic?

Recommended checks:

• Confirm ABB nameplate information
• Verify complete order code
• Inspect terminal blocks and housing
• Check relay display and indicators
• Review available inspection records

For protection relays, correct configuration verification is as important as physical condition.

6. Can the support a legacy feeder protection upgrade?

Yes, when the existing system uses compatible ABB 605 series architecture.

Typical applications:

• Medium-voltage switchgear replacement
• Industrial feeder restoration
• Substation maintenance
• Protection relay spare inventory

The existing CT and trip wiring should be reviewed before installation.

7. What should engineers check before commissioning this relay?

Key verification steps:

1. Confirm auxiliary power supply
2. Verify CT wiring polarity
3. Load correct protection parameters
4. Perform secondary injection testing
5. Test trip outputs
6. Verify communication with SCADA

These checks confirm the relay is correctly protecting the feeder after replacement.