Description
Product Core Brief
- Model:
- Order Code: BD446NN1XG
- Brand: ABB / Hitachi Energy Relion 605 series
- Core Function: Medium-voltage feeder overcurrent and earth-fault protection relay without breaker control.
- Product Type: MV Overcurrent Protection Relay
- Key Specs: Three-stage overcurrent protection | Two-stage earth-fault protection | Thermal overload and negative-sequence protection | Inrush stabilization | Auto-reclose option | Modbus RTU / IEC 60870-5-103 | Universal auxiliary supply 24–265 V AC/DC
- Condition: New Original / New Surplus
Product Introduction
The ABB REJ601 is a dedicated overcurrent protection relay from the Relion 605 series. It is designed for primary and secondary distribution networks in utility and industrial power systems, providing protection and monitoring for cable feeders, overhead lines and distribution transformers.
REJ601 supports three-stage overcurrent protection and two-stage earth-fault protection, with optional definite-time and inverse definite minimum time characteristics. It also provides thermal overload protection, negative-sequence overcurrent protection, phase discontinuity protection, breaker failure protection and inrush-current stabilization for transformer feeders. An auto-reclose option is available for overhead-line applications.
Unlike the REF601, the REJ601 is an overcurrent protection relay without integrated breaker control. The order code BD446NN1XG defines the application configuration, CT inputs, binary I/O, communication options and firmware features. Because REJ601 variants differ by configuration package, the full type code must be verified against the installed nameplate before procurement.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Product Name | REJ601 Overcurrent Protection Relay |
| Order Code | BD446NN1XG |
| Brand | ABB / Hitachi Energy Relion 605 series |
| Primary Function | Overcurrent, earth-fault and feeder protection without breaker control |
| Typical Applications | MV/LV feeders, cable circuits, overhead lines, distribution transformers, industrial and utility distribution systems |
| Protection Functions | 3-stage overcurrent, 2-stage earth-fault, thermal overload, negative-sequence, phase discontinuity, breaker failure, auto-reclose option |
| Communication | Modbus RTU, IEC 60870-5-103 |
| Auxiliary Supply | Universal 24–265 V AC/DC |
| Condition Available | New Original / New Surplus |
Note: Public sources confirm REJ601 as an ABB Relion 605 series overcurrent protection relay with three-stage overcurrent and two-stage earth-fault protection, Modbus RTU and IEC 60870-5-103 communication, and universal auxiliary supply. However, the exact application configuration, I/O count, CT ratio setting and firmware for order code BD446NN1XG are not fully confirmed in open sources. Always verify the installed nameplate and engineering data before replacement.
Quality Control Process
Each REJ601 unit is inspected for housing condition, front-panel HMI, terminal blocks, communication ports, mounting clips and nameplate data. Where test conditions allow, auxiliary power, LED indicators, HMI display and communication interfaces are checked to confirm basic readiness. The unit is packed with anti-static and shock-resistant protection to prevent damage to terminals, connectors and display components during transit.
Replacement Pitfall Guide
❗ Confirm the full order code. BD446NN1XG must match the original device. Other REJ601 order codes may differ in application configuration, I/O and communication options.
❗ Verify the application configuration. REJ601 is available in configuration B, C and D variants, which differ in thermal overload, phase discontinuity, breaker failure and auto-reclose functions.
❗ Check CT and earth-fault wiring. Confirm whether residual current is derived from phase CTs or from a core-balance CT, and whether 1 A or 5 A CT secondary rating is used.
❗ Review communication settings. Modbus RTU and IEC 60870-5-103 parameters, device address, baud rate and mapping must match the existing system.
❗ Back up configuration before removal. Export protection settings, event records, fault records and disturbance records. Photograph terminal wiring, HMI status and configuration before replacement.
Compatibility Matrix & Benchmarks
| Original Model | Replacement / Related Model | Compatibility Level | Migration Notes |
|---|---|---|---|
| ABB | ABB REJ601, same order code | Direct | Confirm configuration, I/O and communication |
| ABB | Other REJ601 variants | Needs Adaptation | Verify application configuration and I/O |
| ABB | ABB REF601 | Needs Adaptation | REF601 includes breaker control; REJ601 does not |
| ABB | ABB REF615 / REF620 | Needs Engineering | Different platform; wiring, HMI and engineering differ |
| ABB | ABB REJ603 | Not Direct | REJ603 is a self-powered relay with different hardware |
Benchmarks
- Platform: ABB / Hitachi Energy Relion 605 series overcurrent protection relay.
- Typical use: MV/LV feeder, cable, overhead-line and transformer feeder protection without breaker control.
- Key advantage: compact press-fit design, preconfigured protection functions, universal auxiliary supply and simple Modbus / IEC 60870-5-103 integration.
If you can share a nameplate photo, existing configuration and I/O list, I can help confirm whether BD446NN1XG is a direct drop-in for your feeder bay.
