The CP-500UH-42-20-3 is part of the SR Passives series of power inductors and transformers. It is a four terminal inductor core with a DC current rating of 42 amps and an inductance of 20 microhenries. The part number indicates that the device is an unshielded power inductor, meaning it does not have any type of ferrite core shielding or surrounding material for increased inductance stability or durability. It is suitable for use in power conversion applications or for filtering and decoupling noise in applications such as motor controllers, robotics, lighting, and other smart devices.