The Altistart U01 is a soft start/soft stop unit for asynchronous motors. It is designed primarily for combinations with TeSys™ U controller starters. When combined with a TeSys™ U controller by means of a connector, the Altistart U01 is a power option which provides the soft start/soft stop function. The result is a unique, innovative motor starter. Using the Altistart U01 starter enhances the starting performance of asynchronous motors by allowing them to start gradually, smoothly and in a controlled manner. It prevents mechanical shocks, which lead to wear and tear and limits the amount of maintenance work and production downtime. The Altistart U01 limits the starting torque and current peaks on starting, on machines which do not require a high starting torque.