Check the listing for details. The Superior Electric Co. 16B Powerstat Variable Autotransformer 0-140V, 10A. Color: Blue, Condition: Used, Made in United States. Listed at 150.00 USD. The Superior Electric Co. 16B Powerstat Variable Autotransformer is a reliable and efficient electrical equipment designed for various industrial applications. This autotransformer, with a power rating of 1.4 kVA and a primary voltage rating of 120V, offers a versatile voltage range of 0-140V and a primary current rating of 10A. With its compact design and blue color, this transformer is ideal for businesses and industries in need of a high-quality power regulation solution. Designed and manufactured in the United States, this autotransformer guarantees smooth performance and durability. It has many uses and is excellent for repairing electric motors because it can slow the revolutions to find dead spots. It can control the power supplied to any 120V device.