Superior Electric 116-C-U Motor Speed Controller

The Superior Electric 116-C-U POWERSTAT Variable Transformer is a single‑phase, open‑construction voltage regulator that accepts 120V line input and provides continuously adjustable AC output for motor speed control. As part of the POWERSTAT family, it is designed to regulate voltage and current with minimal variation from no‑load to full‑load, making it suitable for tuning speed on universal or AC motors when used as a manual or motor‑driven controller. In the 116C family, the basic unit is rated for 120V input with a maximum of 10A for constant‑current loads and 13A for constant‑impedance loads, giving a practical range for common lab and workshop applications. The “U” suffix identifies open construction models with a shaft that projects from the base end for panel mounting. For higher current needs, the 116CU‑40 variant specifies a constant‑current load of 25A and a constant‑impedance load of 30A, expanding its use for heavier motors. Some open‑construction and motor‑driven configurations exist beyond the basic unit, including timed versions; for example, the 60M116CU‑2 is a motor‑driven model with a 60‑second timing option. These units are commonly stocked under Superior Electric or Danaher Motion brands and are used wherever a rugged, analog method to vary voltage—and thus motor speed—is required.