Solid state power controller (SSPC)
Ohmite

Ohmitrol Power and Motor Speed Controls are solid state units which provide an infinitely smooth power control over their entire voltage range. An integral internal trimmer on some models allows customization of the control to a specific application by a simple turn of a screwdriver.

Power and motor speed controls are extremely versatile from an AC source; either AC or DC outputs are possible with the appropriate model. Model PCA, AC output, has applications to control heaters (both resistive and infrared) and motors such as universal and shaded pole, and can replace transformers. Model PCD, DC output, can be used to control shunt and series wound, universal, compound and permanent magnet motors, magnetic clutches, brakes, etc.