The Siemens 3RW3124-1CB14 is a SIRIUS soft starter for standard applications, frame size S0, rated 12.5 A at 40 °C and 5.5 kW at 400 V. It handles an operating voltage range of 200...460 V AC and accepts a control supply voltage of 110...230 V AC/DC at 50/60 Hz. The integrated bypass contact system means the power electronics are bypassed once the motor reaches full speed, reducing heat dissipation in the panel.
The 5.5 kW at 400 V is the 3-phase induction motor power this unit starts; the 7.5 hp at 50 °C is the equivalent for North American 460 V systems. Frame size S0 with screw and snap-on mounting fits standard DIN rails and occupies 45 mm width. The IP20 enclosure is open-style for panel mounting — not for washdown environments. Clearance: 60 mm above, 40 mm below, 15 mm at the sides for airflow. Dual-slope control lets you set separate start and stop voltage ramps — useful for pumps that need a soft stop to prevent water hammer, or conveyors that need a quick start but gentle stop. The integrated bypass switches the motor directly across the line after start, so the soft starter's thyristors cool off during run.