SIEMENS SIRIUS 3RW4443‑6BC44 AC Semiconductor Motor Starter/ Soft Starter

SIEMENS SIRIUS 3RW4443‑6BC44 is a thyristor‑type AC semiconductor soft starter belonging to the high‑end SIRIUS 3RW44 series for three‑phase asynchronous motor control applications. This AC semiconductor soft starter adopts three‑phase anti‑parallel thyristor phase‑angle control to realise smooth voltage ramp‑up soft start and configurable soft‑stop deceleration. The AC semiconductor soft starter supports both inline and inside‑delta wiring configurations to expand motor power capacity. The AC semiconductor soft starter integrates built‑in bypass contactor, comprehensive motor protection, configurable digital I/O and serial communication interfaces for automation system interconnection.

Controlled motor starting‑stopping current and torque regulation is the core function of SIEMENS SIRIUS 3RW4443‑6BC44 AC Semiconductor Motor Starter/ Soft Starter. Controlled motor starting‑stopping current and torque regulation effectively limits motor inrush current to reduce mains voltage dip and eliminate mechanical shock to couplings, belts and gearboxes. Reliable Controlled motor starting‑stopping current and torque regulation provides multiple selectable deceleration modes including voltage ramp‑down, pump‑stop torque control and DC injection braking for pump, fan and conveyor loads. Configurable Controlled motor starting‑stopping current and torque regulation stores three independent parameter sets to adapt to different motor working conditions without hardware modification.

This unit delivers outstanding comprehensive motor and device protective performance for industrial cabinet DIN‑rail installation environments. comprehensive motor and device protective performance covers thyristor over‑temperature protection, phase loss detection, motor overload, PTC thermistor motor winding protection and start timeout fault monitoring. Robust comprehensive motor and device protective performance provides multi‑functional relay alarm outputs and front‑panel LED diagnostic status indication for remote fault notification. Complete comprehensive motor and device protective performance supports parameter commissioning and fault readout via Soft‑Starter ES PC software over serial interface for on‑site troubleshooting.

SIEMENS 3RW4443‑6BC44 features main circuit voltage 200‑460V AC, control supply 230V AC, rated operational current 203A (inline circuit for 110 kW motor at 400V / 40°C; inside‑delta connection up to 200 kW). Equipped with screw‑type power terminals, built‑in bypass contactor; compliant with IEC 60947‑4‑2 and CE standards, operating ambient temperature 0‑60 °C with derating above 40 °C. Widely applied for water pumps, centrifugal fans, material conveyors and compressors in water treatment, HVAC, mining and general manufacturing plants. It is an original critical semiconductor motor‑starting spare part for Siemens SIRIUS 3RW44 low‑voltage motor control solutions.