3RW5077-6AB14, Soft Starter, 315 kW, 570 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: 3RW5077-6AB14

The Siemens 3RW5077-6AB14 is a SIRIUS 3RW50 motor soft starter specified for heavy industrial motor starting. Verified manufacturer data for this SKU show a rated operational current of 570 A and a motor power rating of 315 kW at 400 V, with a wide supply voltage class of 200–480 V AC. The control / auxiliary supply for this model is 110–250 V AC and the unit uses screw-terminal connections for power and control wiring. Typical motor compatibility covers three‑phase asynchronous motors in the upper mid-to-large power range (around 315 kW at 400 V); this makes the 3RW5077-6AB14 suitable for demanding applications such as large pumps, compressors, long conveyors, and industrial process drives where limiting inrush current and reducing mechanical stress at start/stop are required. Verified product features for this SKU include an analog output for monitoring and a built-in bypass contactor to reduce power dissipation in steady-state operation, which together help simplify cabinet wiring and provide a straightforward feedback point for PLCs or process controllers.

Key Soft Starter Attributes