Allen-Bradley 150-C25NBR SMC-3 25A Solid State Motor Controller

Product Overview

The 150-C25NBR​ is a compact, high-performance solid state motor controller manufactured by Rockwell Automation under its renowned Allen-Bradley SMC-3 product family. Designed as a modern replacement for traditional electromechanical contactor-and-overload combinations, the 150-C25NBR​ uses advanced solid state switching technology to provide smooth, controlled starting and stopping of three-phase induction motors while eliminating the arcing, contact wear, and maintenance headaches associated with conventional contactors. Rated for 25 amperes of continuous load current, the 150-C25NBR​ is purpose-built for the demanding conditions found in North American industrial installations and integrates seamlessly into Rockwell Automation control architectures alongside CompactLogix, ControlLogix, MicroLogix, and SLC 500 controllers, as well as PowerFlex drives.

At the heart of the 150-C25NBR​ is a sophisticated microcontroller that manages every phase of the motor’s operating cycle. The controller applies a gentle, pre-programmed voltage ramp to the motor during startup, gradually increasing power instead of subjecting the windings and mechanical load to the violent jolt of across-the-line starting. This soft-start capability dramatically reduces both electrical stress on the power distribution system and mechanical stress on couplings, gearboxes, belts, and driven equipment. The 150-C25NBR​ also offers a controlled deceleration or soft-stop function, which is especially valuable for high-inertia loads such as fans, blowers, and centrifugal pumps where an abrupt stop would cause dangerous pressure surges or product damage.

The “BR” designation of the 150-C25NBR​ indicates a unit equipped with the RUN signal option, providing a clearly visible indication that the controller is actively energizing the motor. With an operating voltage range of 200 to 480 volts AC and robust current limiting, the 150-​ protects both the motor and the upstream electrical infrastructure from the damaging inrush currents that can trip breakers and distort power quality. Its compact footprint saves valuable panel space, while the solid state design—free of moving contacts—delivers exceptional reliability in high-cycle applications. Together, these attributes make the 150-​ a compelling choice for engineers seeking to reduce downtime, extend equipment life, and build a more efficient and controllable motor-driven process.

Technical Specifications