25B-B017N104 is a model of Allen-Bradley PowerFlex 525 AC Drive. It is an inverter that is designed to provide speed control for three-phase induction motors. The "25B" in the model number indicates that it belongs to the PowerFlex 525 series. The "B017" refers to the power rating and output current capacity of the drive, and the "N104" specifies the specific version or revision of the drive. This inverter offers a compact and cost-effective solution for various industrial applications that require variable speed control of motors.