This is an ABB 61445421 Choke du/dt with IP54 protection rating. It is used to provide high currents of pulse-type loads while reducing common-mode emissions, thus creating a high frequency electromagnetic field shield. The device helps suppress stray electromagnetic radiation from electronic systems and provides circuit protection from sudden changes in voltage. It is typically used in switch mode power supplies, machine tools, computer systems, and communication systems. It is designed with corrosion-resistant, vibration-resistant, and shockproof housing to ensure reliable operation. This component is UL approved and compliant with RoHS international environmental regulations.