Allen-Bradley 154-A16NA Starting Torque Controller

Allen-Bradley 154-A16NA Starting Torque Controller is a Bulletin 154 STC solid-state device that delivers a defined starting torque for low-horsepower single- and three-phase squirrel cage induction motors, providing a cost-effective soft-starting solution for compact drives and light industrial equipment. The 154-A16NA is the 16 A (A16) North America variant designed for use with either single-phase or three-phase motors, and it is intended to be wired in series with a motor starter rather than as a standalone drive. This STC module ramps torque during start to limit inrush and achieve a controlled, repeatable acceleration, making it suitable for applications such as conveyors, fans, and small pumps where smooth starting is important. The family is described in Rockwell documentation as designed for low-horsepower motors, and Rockwell has published obsolescence notices for the 154-A11/A16/A22 models, so availability should be confirmed for new or retrofit projects.