The 10B and 10C series are continuously adjustable variable transformers with movable brushes and taps mounted on a commutator to vary the voltage output.
The voltage Dial is graduated in decades up to 100, outputting voltages between 0 to 120 VAC or with the boost connection to a maximum voltage of 132 VAC.
The 10B and 10C minimal wave distortion make these powerstats ideal for OEM, testing and in-panel applications.

The 10 series is available in a 1, 2 or 3Ø configurations, and are rated at 2.25A for constant current loads, and at 3 amps for constant impedance loads such as incandescent lamps or resistance heaters etc., voltage is drawn nearly proportionally to applied voltage.