Siemens 3RW4046-2TB04 Three Phase AC Motor Starter

Siemens SIRIUS Soft Starter 3RW4046-2TB04 is a three‑phase AC motor soft starter designed to reduce inrush currents and mechanical stress by gradually ramping motor current during start and stop. Rated for 200 to 480 V AC line voltage, it delivers up to 80 A (Ie) and supports motors up to 45 kW at 400 V. The unit accepts a 24 V AC/DC control signal and uses spring‑type terminals for robust wiring. Thermistor motor protection is integrated per IEC 60947-4-2, providing overload and motor temperature monitoring. Part of Siemens' SIRIUS 3RW40 family, the 3RW4046-2TB04 comes in an IP20 enclosure suitable for indoor panel mounting and engineering-friendly DIN-rail integration. Typical applications include fans, pumps, conveyors, and general automation loads where soft starting improves system longevity and energy efficiency. The device is compatible with standard motor protection schemes and supports straightforward startup sequences, making it a common choice in industrial drives and process automation where precise torque control and reduced starting current are essential.