Source google image: https://canadatransformers.com/media/catalog/product/cache/1/image/260×260/9df78eab33525d08d6e5fb8d27136e95/n/e/nema-3r_04_173.jpg
K type isolation transformer
Source google image: https://canadatransformers.com/media/catalog/product/cache/1/image/260×260/9df78eab33525d08d6e5fb8d27136e95/n/e/nema-3r_04_173.jpg