The 3RW3027-1BB04 is a 3-phase AC soft starter from Siemens, designed for motors up to 15 kW at 400 V AC or 18.5 kW at 500 V AC. It supports voltage ranges of 380–480 V (for 15 kW) and 500–690 V (for 18.5 kW), with current ratings of 32 A (400 V) and 25 A (690 V).