The Celduc SO467501 is a 90A, 4KV, 60HZ phase angle controller designed to control the phase angle, current, and voltage of three-phase applications. This unit provides precise, continuous control of the AC power delivered to the load (including reactive power and total harmonic distortion). It features a high-efficiency, switching type regulator for improved start-up and dynamic response, multiple protection safeguards, user programmable parameters, and LED terminals for easy wiring. The SO466501 is designed for applications such as electric furnaces/ovens, arc welders, formers, AC motor drives, and induction heaters.