The product is a vintage STACO Energy Products Type 250 BU variable autotransformer, suitable for single-phase AC systems with a primary voltage rating of 120V. Made in the United States, it is new in its original box, ensuring quality and reliability for industrial and commercial applications. The autotransformer offers versatile voltage regulation capabilities, making it a valuable addition to electrical equipment and supplies for businesses and industries seeking efficient power transformation solutions.
eBay