3RW5056-6AB14, Soft Starter, 90 kW, 171 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: 3RW5056-6AB14

The Siemens 3RW5056-6AB14 is a SIRIUS 3RW50 soft starter rated for 171 A (rated operational current at 40 °C) and specified for three-phase motors up to 90 kW at 400 V (45 kW at 230 V). It is designed for supply voltages from 200 to 480 V AC and accepts a control supply of 110–250 V AC. This model is suitable for medium‑to‑large industrial motors such as pumps, compressors and conveyors where controlled ramp-up and ramp-down reduce mechanical stress and limit inrush current. Verified features for this SKU include voltage ramp (soft start) and ramp-down, adjustable current limitation, Soft-Torque start behaviour, built‑in bypass contact for reduced heat dissipation during run, thermistor (PTC/Klixon) input and electronic motor overload evaluation for motor protection, and optional communication modules (PROFINET, PROFIBUS, Modbus TCP/RTU) when required for integration. These capabilities make the 3RW5056-6AB14 appropriate where reliable motor protection, remote reset and factory‑network integration are needed without moving to a larger starter family.

Key Soft Starter Attributes