ABB REF545KB133AAAA – High-Performance Protection Relay for Power Distribution Systems

Engineered for demanding power distribution applications, the ABB REF545KB133AAAA protection relay delivers precise fault detection and system safeguarding. This device plays a critical role in maintaining grid stability by protecting medium-voltage transformers, feeders, and motors from electrical anomalies.

Commonly deployed in industrial substations and energy infrastructure projects, this relay integrates seamlessly with ABB’s INFI 90 systems and DSQC series components. Field technicians particularly appreciate its compatibility with existing IEC 61008-certified installations. We’ve seen this model excel in protecting critical assets like mining equipment transformers and renewable energy grid connections, often working alongside 5SHY6545L0001 power modules for comprehensive system protection.

What sets this relay apart is its dual communication protocol support (Modbus RTU + Profibus DP) enabling real-time diagnostics in hybrid control systems. The Class 5P20 protection rating ensures reliable operation even under extreme thermal cycling conditions. While not inherently redundant, its modular design allows easy parallel installation for critical applications. One engineer noted its exceptional performance during voltage recovery scenarios, maintaining 0.5 cycle response times during brownout conditions. The ruggedized enclosure meets IP54 standards, providing dust/water resistance without compromising terminal accessibility.