Product Core Brief
- Model: ABB REJ525B412BAA
- Brand: ABB
- Series: REJ 500
- Core Function: Protection of feeders, transformers, and busbars
- Product Type: Numerical Protection Relay
- Key Specs: Overcurrent & Earth Fault | 110–250 V AC/DC Supply | IEC 60870-5-103 Compatible
- Condition: New Original (New Surplus)
Key Technical Specifications
- Module Type: Numerical Protection Relay
- Protection Functions: Overcurrent | Earth Fault | Thermal Overload | Short Circuit | Time-graded Trip
- Current Inputs: 1 A / 5 A CT selectable
- Voltage Inputs: 57.7–110 V nominal, 3-phase
- Digital Inputs: 8 configurable channels
- Digital Outputs: 4–8 relay outputs, configurable
- Communication Protocols: IEC 60870-5-103 | Modbus RTU | DNP3 (optional)
- Auxiliary Supply: 110–250 V AC/DC ±15%
- Power Consumption: 10–15 W typical
- Mounting: Panel mount or DIN rail adapter
- Operating Temperature: -25°C to +55°C
- Storage Temperature: -40°C to +70°C
- Isolation: 500 V AC between I/O channels
- Firmware Version: Verify with OEM; typically 2.x series for REJ500
- Compliance: IEC 60255 | CE marked | CB certified
- Dimensions: 160 mm × 100 mm × 80 mm
Product Introduction
ABB REJ525B412BAA is a numerical protection relay from the ABB REJ500 series designed for feeder, transformer, and busbar protection in industrial and utility networks. It integrates multiple protection functions such as overcurrent, earth fault, and thermal overload, all in a single unit, while providing configurable digital I/O for interlocking, tripping, and signaling.
This module communicates via IEC 60870-5-103, supporting integration into legacy SCADA systems. The device is suitable for retrofitting existing REJ500 panels or expanding new protection systems. New Surplus units are fully tested—power-on self-test, analog/digital simulation, insulation verification, and firmware check—to ensure proper functionality without requiring full rewiring.
