Transformer Protection Terminal RET 521 ABB for Power Systems Industrial Automation Communication Module 31 - 2 Ethernet Quantum

31 - 2 Ethernet Quantum remote I/O racks

ensuring fast availability for urgent replacements or upgrades

Input Impedance: 2500 Ohm

System LEDs

providing efficient voltage and current regulation

Transformer Protection Terminal RET 521 ABB for Power Systems Industrial Automation Communication Module 31 - 2 Ethernet QuantumOverview The ABB RET 521 is a numerical microprocessorbased protection terminal that provides advanced transformer protection functions in a compact design. It is engineered to safeguard twowinding and threewinding transformers, generatortransformer blocks, and reactors. Moreover, it integrates multiple protective features such as inrush restraint, overexcitation protection, and zerosequence current elimination. In addition, the RET 521 supports