The autotransformer is an indoor unit with natural air cooling. It is applicable to three‑phase motors in industrial and mining enterprises for reduced‑voltage starting on three‑phase AC circuits with rated frequency of 50 Hz (60 Hz for special order) and voltage up to 1200 V. This product complies with relevant requirements of IEC 292‑4 standard. Featuring small size, light weight and high energy efficiency, it is a standardized and serialized product with certain international advanced level.