Product Core Brief
- Model: REJ525B415BAA
- Brand: ABB
- Series: REJ525
- Core Function: Overcurrent and earth-fault protection
- Product Type: Protection Relay
- Key Specs: 5 A CT | IDMT stages | Disturbance recorder
- Condition: New Original (New Surplus)
Key Technical Specifications
- Protection Functions: Three-phase low-set/high-set overcurrent, low-set/high-set earth-fault
- Current Inputs: 5 A nominal (CT secondary)
- Characteristics: Definite time or IDMT for overcurrent and earth-fault stages
- Additional Functions: Circuit-breaker failure protection, phase discontinuity
- Communication: IEC 60870-5-103, SPA bus
- Power Supply: Auxiliary voltage range per variant (verify label)
- Mounting: Flush or semi-flush case
- Standards: IEC 60255 compliant
- Event Recorder: Up to 60 events, disturbance recorder
- Self-Supervision: Continuous monitoring of hardware and software
- Operating Temperature: -10°C to +55°C typical
Product Introduction
ABB REJ525B415BAA is a combined overcurrent and earth-fault relay designed for selective short-circuit and non-directional earth-fault protection in medium voltage distribution networks. It also applies to protection of generators, motors, and transformers.
This relay provides flexible tripping with multiple stages, disturbance recording, and serial communication options. It supports cost-effective deployment in existing panels due to its compact design and compatibility with older distribution systems.
