Allen-Bradley 150-F251NBD Ser B SMC-Flex 251A 100-240VAC Smart Motor Controller
Allen-Bradley 150-F251NBD Ser B is a SMC-Flex solid-state smart motor soft starter manufactured by Rockwell Automation for three-phase AC induction motors. This smart motor controller performs soft ramp start and soft stop to reduce inrush current and mechanical shock for pumps, fans and conveyors. The smart motor controller provides built-in motor overload protection, phase loss detection, current unbalance monitoring and fault diagnostics, supporting Modbus communication for PLC connection. The smart motor controller has an integrated local LCD keypad for parameter setup, status reading and fault code checking. The smart motor controller serves as critical motor control spare part for industrial power cabinet overhaul and motor soft-start retrofit.

This 150-F251NBD Ser B unit is open-frame design, rated motor current 251A, main power voltage 200–480VAC, control supply 100–240VAC. 150-F251NBD Ser B handles 100–200Hp motor at 460V, supports pump control algorithm, built-in SCR power stage, compliant with IEC 60947-4-2, UL and CE certification. 150-F251NBD Ser B supports adjustable starting voltage, kick start, energy saving function and programmable relay outputs. 150-F251NBD Ser B is widely used in water treatment, oil & gas, mining, marine auxiliary pump and fan motor control panels.

As high-performance solid-state motor starting hardware, this Allen-Bradley SMC-Flex controller protects mechanical equipment and electrical network by limiting starting surge current. Allen-Bradley SMC-Flex series spare parts include 150-F251NBD soft starters, control boards, SCR modules, keypad displays and power terminal assemblies for motor control system maintenance. Allen-Bradley SMC-Flex smart motor controllers are trusted replacement units for industrial soft-start motor control systems.