B&B PM125 Motor Speed Controller

PM125 Motor Speed Controller by B&B Motor & Control is a compact subfractional DC drive designed for precise speed control of small DC motors. It is rated for 1/4 horsepower and expects a 115 VAC input, with the armature able to be driven up to 130 VDC and a typical armature current of up to 8 A. This configuration makes the PM125 suitable for 115 VAC powered systems that drive a DC motor in the 0.25 HP range, offering adjustable speed control rather than providing AC motor speed variation. The device functions as a dedicated DC drive rather than a general purpose AC speed controller, and its DC armature output supports motors within the stated voltage/current envelope. The PM125 is listed as discontinued by the manufacturer, and available units are typically found through distributors as used equipment. When integrating this controller, ensure the connected motor’s voltage and current ratings remain within the PM125’s limits and that the control wiring matches the unit’s input and armature terminals. For buyers maintaining older equipment or seeking a budget-friendly solution for small DC motors, the PM125 provides a straightforward option for speed regulation, as long as the application remains within its 1/4 HP, 115 VAC input, 130 VDC armature parameters.