3RW5545-6HA14, Soft Starter, 160 kW, 315 A, 200 to 480V AC

Siemens 3RW55 Soft Starter Series – Overview

Siemens 3RW55 soft starters are heavy-duty motor starting solutions designed for high-power industrial applications requiring robust and reliable control of three-phase asynchronous motors. The 3RW55 series focuses on reducing mechanical stress, limiting inrush current, and supporting very high motor power ratings with advanced motor protection and monitoring capabilities. With a rugged design and suitability for demanding operating conditions, Siemens 3RW55 soft starters are well suited for large pumps, compressors, crushers, conveyors, mills, and other heavy industrial machinery where dependable motor starting and long-term reliability are critical.

Product Description: 3RW5545-6HA14

The Siemens 3RW5545-6HA14 is a SIRIUS 3RW55 high-performance motor soft starter rated for 315 A (at 40 °C) designed for supply voltages from 200–480 V AC. At standard wiring and 400 V the unit is specified for up to 160 kW motor power (at 40 °C); at 230 V the corresponding standard rating is 90 kW. Control supply (auxiliary/control voltage) for this SKU is 110–250 V AC. This model includes an internal bypass to reduce heat inside the control cabinet during continuous operation and integrates electronic motor protection with thermal-overload tripping. The 3RW5545-6HA14 is intended for heavy industrial motor starting — large pumps, compressors, conveyors and other three‑phase asynchronous motor loads — where limiting inrush current, reducing mechanical stress and providing monitored starts are required. Verified product features for this SKU include torque (moment) regulation for optimized starts, a detachable HMI option for clear local display and commissioning, and Condition Monitoring / diagnostic capabilities plus optional plug-in communications (PROFINET, PROFIBUS, Modbus TCP) via dedicated modules for integration into automation systems.

Key Soft Starter Attributes