150-F43NBDB Allen-Bradley SMC Flex Smart Motor Controller – Product Description

Product Overview

The 150-F43NBDB is a solid-state smart motor controller from Allen-Bradley‘s SMC Flex series (Bulletin 150), engineered to provide controlled starting and stopping of three-phase AC induction motors. As a soft starter, the Allen-Bradley 150-F43NBDB eliminates the mechanical, electrical, and thermal stress associated with direct-on-line motor starting by gradually ramping voltage and current during acceleration and deceleration . This controlled approach extends motor life, reduces maintenance costs on driven equipment, and minimizes voltage sags on the supply network that can affect sensitive loads. The controller is rated for 43 A output current with a power range of 7.5 to 30 HP at 460 V AC, accommodating a broad spectrum of industrial motor applications .

Within Allen-Bradley’s motor control portfolio, the 150-F43NBDB occupies a middle tier between basic SMC-3 soft starters and the advanced SMC-50 platform. The “F43” designation indicates the 43 A current rating, while the “NBDB” suffix specifies an open enclosure, 100–240 V AC control voltage, and the built-in pump control option . This configuration makes the 150-F43NBDB particularly suited for pumping applications where controlled acceleration and deceleration prevent water hammer, pressure surges, and mechanical damage to piping systems. The controller includes an integrated bypass contactor that transfers motor current from the SCRs to a mechanical contact after startup completes, reducing heat generation and allowing installation in smaller enclosures .

The Allen-Bradley 150-F43NBDB supports multiple starting and stopping modes including soft start, kickstart, current limit start, dual ramp start, full voltage start, soft stop, and smart motor braking, providing application flexibility without additional hardware . A built-in human interface module with multilingual backlit LCD enables local configuration, monitoring, and diagnostics. The controller also provides comprehensive metering functions for amps, volts, kW, kWh, power factor, and motor thermal capacity usage, supporting energy management and predictive maintenance initiatives .

Technical Specifications