Product Core Brief
- Model: REL561
- Brand: ABB
- Series: REL561*2.3
- Core Function: Line differential and distance protection
- Product Type: Protection Terminal
- Key Specs: Multi-zone distance | Fiber optic comm | Expandable I/O
- Condition: New Original (New Surplus)
Key Technical Specifications
- Protection Functions: Line differential, 5-zone distance, overcurrent backup
- Communication: Fiber optic, IEC 60870-5-103, Modbus RTU
- Analog Inputs: Multiple CT/VT for currents and voltages
- Mounting: 19-inch rack or flush/surface
- Power Supply: 24-250 V DC variants
- Standards: IEC 60255 compliant
- Operating Temperature: -25°C to +55°C
- Event Recording: Disturbance recorder and sequence of events
- Hardware Design: Expandable with additional I/O modules
- Firmware: Version 2.3 typical (verify on unit)
Product Introduction
ABB REL561 is a numerical line differential and distance protection terminal. It provides high-speed fault clearing for overhead lines and cables in medium and high voltage transmission networks.
This terminal combines differential protection with multi-zone distance functions and supports extensive configuration. It enables cost-effective upgrades in existing substations through expandable hardware and protocol compatibility with legacy systems.
