Siemens Soft Starter, 45kW, 480V AC - 3RW40 Series - 3RW4046-1BB14. This compact soft-starter from Siemens' innovative SIRIUS 3RW40 series helps to reduce the mechanical stress on a 3-phase asynchronous motor. It also limits current and voltage fluctuations during start-up and features an integrated bypass to prevent heat dissipating in the control cabinet. It has intelligent monitoring to guard against overload and overheating. This smart unit is easy to use and offers maintenance-free switching, with an integrated remote reset that lets you quickly address and clear faults from different locations.Siemens Sirius 3RW40 Series SoftStart to 80A for 45kW (60HP) 400V 3 Ph motor. Rated to suit motors and Trip Class Ratings: 45kW, 80A at 400V - Trip Class 10 (see Trip Class Guide below for definitions). Wall mount in clean environment or cubicle mount. What's a 3-phase motor? A 3-phase motor is driven by three alternating currents of the same frequency, which peak at alternating moments. Motors of this kind are widely used in heavy-duty industrial equipment. CCC Certified, CE Certified, CSA Certified, EAC Certified, UL Listed.