Shanghai Huaming primarily engages in the research, development, manufacturing, sales, and service of on‑load tap changers and off‑load tap changers for transformers. Over the past two decades, it has independently developed a wide range of tap changer products, which have been safely operated in nearly one hundred countries worldwide, making it one of the preferred tap changer solutions for power grids and industrial users around the globe. Classified under "Electrical Machinery and Equipment Manufacturing" within the "Manufacturing" sector, it is not considered a high‑energy‑consumption or moderately polluting industry.