Description
ABB REJ603BB401NN31E Self-Powered Feeder Protection Relay
Product Introduction
Medium-voltage feeders need protection that can remain operational even when auxiliary control power is limited or unavailable. The ABB REJ603BB401NN31E is the HMI-equipped version of ABB’s Relion REJ603 self-powered feeder protection relay, designed for three-phase feeder protection using dedicated ring-type current transformers. ABB’s ordering documentation explicitly identifies REJ603BB401NN31E as the version with HMI.
This is not a conventional 1 A or 5 A CT relay. The REJ603 requires specific REJ603 ring CTs, with five CT variants covering reference-current settings from 8–28 A through 128–448 A. That CT dependency is one of the first things to verify during replacement or retrofit work; matching the relay model while leaving the existing conventional CTs in place will not produce a valid installation.
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Product Model | REJ603 |
| Complete Order Code | REJ603BB401NN31E |
| Manufacturer | ABB |
| Product Family | Relion 605 series |
| Product Type | Self-powered feeder protection relay |
| HMI | Integrated HMI |
| Main Application | Medium-voltage feeder protection |
| Protection Functions | Three-phase overcurrent and earth-fault protection |
| Current Measurement | Dedicated REJ603 ring-type CTs |
| Conventional 1 A / 5 A CT | Not compatible |
| CT Variant 1 | REJ603-CT1, 8–28 A |
| CT Variant 2 | -CT2, 16–56 A |
| CT Variant 3 | -CT3, 32–112 A |
| CT Variant 4 | -CT4, 64–224 A |
| CT Variant 5 | -CT5, 128–448 A |
| HMI Display | 128 × 64 pixel touch-screen display |
| Mounting | Wall / mounting-plate installation |
| Baseplate Height | 160 mm |
| Baseplate Width | 96 mm |
| Operating Frequency | 50 Hz |
| Power Architecture | Self-powered protection relay |
| External Supply Reference | 24 VDC configurations are documented |
| Protection Class | Application-dependent; verify complete installation |
| Order-Code Variant | With HMI |
ABB’s current product page identifies this exact code as and describes it as Self-powered Feeder Protection. ABB’s technical documentation gives the dedicated CT ranges and the HMI configuration.
Major Features / Advantages
Self-Powered Feeder Protection
The defining feature of the is its self-powered protection architecture. It was developed for feeder applications where the relay can derive operating energy from the measured current circuit, reducing dependence on a separate auxiliary power system. This is particularly relevant to medium-voltage switchgear where protection availability must be considered independently from the normal control-power architecture.
The exact BB401NN31E ordering code identifies the HMI-equipped rather than the visually similar version without HMI. ABB documentation lists REJ603BB401NN3XE for the non-HMI version and REJ603BB401NN31E for the HMI version.
REJ603BB401NN31EModel: REJ603
Order Code: REJ603BB401NN31E
Manufacturer: ABB
Product Family: Relion 605 series
Product Type: Self-powered feeder protection relay / protection IED
HMI: Integrated HMI
Protection: Three-phase overcurrent and earth-fault protection
Power: Self-powered from the measured current circuit; external auxiliary supply can also be used in applicable configurations
CT Requirement: Dedicated REJ603 ring-type phase CTs
CT Compatibility: Not compatible with conventional 1 A / 5 A CTs
Mounting: Wall/plate mountingModel: REJ603
Order Code: REJ603BB401NN31E
Manufacturer: ABB
Product Family: Relion 605 series
Product Type: Self-powered feeder protection relay / protection IED
HMI: Integrated HMI
Protection: Three-phase overcurrent and earth-fault protection
Power: Self-powered from the measured current circuit; external auxiliary supply can also be used in applicable configurations
CT Requirement: Dedicated REJ603 ring-type phase CTs
CT Compatibility: Not compatible with conventional 1 A / 5 A CTs
Mounting: Wall/plate mounting
Dedicated Ring-CT Measurement
The current-input arrangement deserves more attention than the relay housing itself. uses specially designed ring CTs for phase-current measurement. ABB specifies five CT versions, covering reference-current setting ranges of 8–28 A, 16–56 A, 32–112 A, 64–224 A, and 128–448 A.
This means the relay should be procured together with the correct CT information. The familiar assumption that a protection relay can simply accept an existing 1 A or 5 A secondary is incorrect here. ABB explicitly states that the is not compatible with conventional 1 A/5 A CTs.
Integrated HMI
The HMI-equipped version provides local access to relay information and settings. The documented display is a 128 × 64 pixel touch-screen display, while the relay mounting arrangement is designed for installation on a mounting plate or within applicable switchgear arrangements.
For maintenance teams, having the HMI integrated into the relay simplifies local inspection of protection parameters and operating information. It also provides a clear distinction between this order code and the version supplied without the HMI.
Feeder Overcurrent and Earth-Fault Protection
The is intended for feeder protection, with protection functions covering phase overcurrent and earth-fault conditions. ABB documentation also describes three-phase inrush detection and switch-on-to-fault characteristics, which are relevant when the protected feeder includes transformers or other equipment capable of producing substantial energization currents.
The relay should therefore be treated as a protection IED rather than a general-purpose measurement relay. Pickup values, operating times, CT selection, and coordination settings must be checked against the actual feeder protection study.
Compact Switchgear Installation
The documented relay baseplate is approximately 160 mm high and 96 mm wide, with mounting arrangements intended for wall or mounting-plate installation. This makes the suitable for integration into compact medium-voltage switchgear and ring-main-unit protection arrangements.
Application Scenarios & Pain Points
Medium-Voltage Feeder Protection
is designed specifically for feeder protection applications where phase overcurrent and earth-fault protection are required. Its self-powered architecture is particularly relevant to switchgear installations where conventional auxiliary power availability is limited.
Ring Main Unit Protection
The dedicated ring-CT architecture makes suitable for compact MV switchgear arrangements designed around the relay’s specified current-sensing system.
Transformer Feeder Applications
The documented three-phase inrush detection function is relevant where a protected feeder supplies a transformer. The protection settings must distinguish normal energization current from genuine fault current rather than relying only on a generic overcurrent threshold.
Legacy Replacement
For an existing installation, the complete ordering code matters. REJ603BB401NN31E identifies the HMI version; REJ603BB401NN3XE is the corresponding documented version without HMI. Procurement should therefore compare the original nameplate before selecting a replacement.
Related Products
- REJ603BB401NN3XE — version without integrated HMI.
- REJ603BNNNNNNBZA — Add-on HMI kit listed by ABB for the family.
- — Dedicated ring CT covering an 8–28 A reference-current setting range.
- — Dedicated ring CT covering 16–56 A.
- — Dedicated ring CT covering 32–112 A.
- — Dedicated ring CT covering 64–224 A.
- — Dedicated ring CT covering 128–448 A.
- REJ601 — Related Relion 605-series feeder protection relay.
- REF601 — Related Relion 605-series feeder protection relay for applications requiring a different protection architecture.
- REM601 — Related Relion 605-series motor protection relay.
Engineer’s Guide — Field Pitfalls to Avoid
1. Do not connect conventional 1 A or 5 A CTs.
This is the most important procurement warning. ABB explicitly states that requires specific ring-type CTs and is not compatible with conventional 1 A/5 A CTs.
2. Verify the CT variant before replacing the relay.
The five dedicated CT variants cover substantially different reference-current ranges. A relay replacement without confirming the existing CT type can leave the protection system incorrectly configured.
3. Confirm the HMI option from the complete order code.
The exact NN31E code identifies the HMI-equipped configuration. The corresponding non-HMI code is NN3XE. Do not assume the display can be omitted without considering the original panel arrangement.
4. Do not treat the relay’s current setting as the CT primary rating.
The documentation expresses CT selection through the reference-current setting range. That is different from simply reading the primary current of a conventional protection CT.
5. Check inrush protection settings on transformer feeders.
Three-phase inrush detection is part of the documented protection functionality. When commissioning a transformer feeder, verify the inrush restraint/detection parameters against the transformer and feeder characteristics rather than copying settings from another installation.
6. Verify the nameplate before procurement.
ABB has several configurations that look similar in catalog listings. Record the complete order code, HMI status, CT type, and existing wiring arrangement before ordering a spare.
FAQ
What is ABB ?
It is the ABB Relion Self-Powered Feeder Protection Relay with HMI. ABB’s ordering information explicitly identifies as the HMI-equipped configuration.
Is a conventional 1 A or 5 A protection relay?
No. The requires dedicated ring-type phase CTs and is not compatible with conventional 1 A/5 A CTs.
What CT ranges are available?
ABB documents five CT variants: -CT1: 8–28 A; CT2: 16–56 A; CT3: 32–112 A; CT4: 64–224 A; CT5: 128–448 A reference-current setting ranges.
Does this exact model include an HMI?
Yes. The complete order code is explicitly listed by ABB as . The non-HMI configuration is REJ603BB401NN3XE.
What is the HMI display resolution?
ABB documentation describes the HMI as a 128 × 64 pixel touch-screen display.
What type of protection does provide?
It is a self-powered feeder protection IED intended primarily for phase overcurrent and earth-fault protection. The documented protection functions also include three-phase inrush detection and switch-on-to-fault characteristics.
What should be verified before buying a replacement?
Verify the complete order code, HMI configuration, dedicated ring-CT type, reference-current range, existing switchgear wiring, and actual inventory condition. The CT requirement is especially important: a visually similar conventional CT installation is not automatically compatible with this relay.
