The XJ01 series auto-transformer pressure-reducing starter is suitable for AC 50Hz, rated working voltage 380V, capacity 300kW and below three-phase squirrel cage induction motor for non-frequent voltage reduction starting. It is widely used in the electrical transmission equipment of all industrial fields such as metallurgy, petroleum, chemical industry, mining, construction and environmental protection. The product structure is simple, economical and practical, and has overload and phase fault protection functions.