The 150-S251NBR controller, part of Allen-Bradley's SMC-50 series, is a sophisticated microprocessor-controlled motor controller featuring an internal bypass and a robust output current capability of 251 Amps. Designed to handle three-phase input voltages from 200 to 480 Volts AC at 50 to 60 Hertz, and supporting a control voltage of 24 Volts DC, it offers versatile control I/Os including two relay outputs and two 24V DC inputs. With optional communication enhancements like the 20-COMM-X modules and compatibility with both standard and wye-delta six-lead motors, this controller also provides the ability to integrate various option modules such as PTC, ground fault, and current feedback modules, ensuring adaptability for diverse industrial applications.