The self coupling voltage reducing starter, also known as a compensator, is a type of voltage reducing starting device commonly used to start three-phase cage induction motors (also known as asynchronous motors) with a rated voltage of 220/380. The autotransformer voltage reducing starter adopts a tap type autotransformer for voltage reducing starting, which can adapt to the starting needs of different loads and obtain a greater starting torque than when starting with the "star triangle". It is also equipped with a thermal relay and a voltage loss release, with perfect overload and voltage loss protection functions, and is widely used
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