https://www.electronicdesign.com/technologies/components/passives/article/21193825/auto-transformers-allow-north-american-appliances-to-be-used-worldwide
Auto-Transformers Allow North American Appliances to be used Worldwide | Electronic Design
Foster Transformer introduces a new line of Auto-Transformers or autoformers that use a single non-isolated winding to step up or step down the available line...
to be usedauto transformersnorth american