3RW5073-6AB14, Soft Starter, 132 kW, 250 A, 200 to 480V AC

Siemens 3RW50 Soft Starter Series – Overview

Siemens 3RW50 soft starters are high-performance motor starting solutions designed for demanding industrial applications requiring reliable control of three-phase asynchronous motors. The 3RW50 series focuses on reducing mechanical stress, limiting inrush current, and supporting higher motor power ratings compared to compact soft starters. With robust construction and advanced motor protection capabilities, Siemens 3RW50 soft starters are well suited for heavy-duty applications such as large pumps, compressors, conveyors, mixers, and industrial process machinery where dependable motor starting is critical.

Product Description: 3RW5073-6AB14

The Siemens 3RW5073-6AB14 is a SIRIUS 3RW50 soft starter specified for medium‑to‑large three‑phase motor installations. It is rated at 250 A (at 40 °C) and supports nominal motor power up to 132 kW at 400 V (75 kW at 230 V), making it suitable for motors commonly used on big pumps, fans, compressors and conveyor drives in industrial plants. The unit accepts a wide supply voltage range of 200–480 V AC and is driven by a 110–250 V AC control voltage. Start and stop profiles use voltage ramp control with adjustable start/stop times (0–20 s) and built‑in current limiting to manage inrush and protect mechanical systems. Practical features verified for this SKU include an analog output for process feedback, screw‑terminal connections for mains and control wiring, and integrated electronic overload protection. Use cases where this model adds value include replacing direct-on-line starters to reduce mechanical wear, limiting supply network disturbances when starting high-inertia loads, and providing actionable motor status signals to a local PLC or monitoring system via the analog output.

Key Soft Starter Attributes