The Siemens 3RW3016-1BB04 is a SIRIUS soft starter in size S00, designed to ramp induction motors up to speed and reduce inrush current during start-up. It carries a rated current of 9 A at 40 °C, derating to 8 A at 50 °C and 7 A at 60 °C — the 40 °C figure is the one to size against unless your panel runs hotter.
Clearance requirements: 60 mm above and 40 mm below for airflow, 15 mm at the sides. The screw-type terminals on the main circuit accept 2x (0.25... 2.5 mm²) solid or stranded, and the auxiliary/control circuit uses the same terminal style.
The integrated bypass contact system means the thyristors are shorted out once the motor is up to speed, so heat dissipation during run is minimal — no external bypass contactor needed. Minimum load is 10 % of rated current, so it won't drop out on lightly loaded motors.
