The Allen-Bradley 150-F251NCR SMC-Flex stands out as a robust solid-state controller, optimized with an open enclosure for efficient operation. It boasts a controller rating of 251 amps and supports up to 200 horsepower at 460 volts AC, handling a maximum rated voltage of 500/575 volts AC. Designed to accommodate input voltages ranging from 200 to 575 volts AC across three phases, it operates effectively at both 50 and 60 Hz, with a control voltage requirement of 24V AC/DC for units between 5 to 480 amps.