3RW5543-6HA14, Soft Starter, 110 kW, 210 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: 3RW5543-6HA14

The Siemens 3RW5543-6HA14 is a SIRIUS 3RW55 high-performance motor soft starter specified for industrial motor starting where high power and reliable protection are required. This model is rated for a nominal operational current of 210 A (at 40 °C) and is designed for supply voltages from 200 to 480 V AC, with a control/auxiliary supply of 110–250 V AC. Typical motor compatibility includes ratings up to 110 kW at 400 V (55 kW at 230 V) using standard switching, and higher motor-power combinations when using star-delta switching as defined by the product documentation. The 3RW5543-6HA14 uses three-phase control and torque regulation to optimise starting behaviour for large motors and root-3/triangle connections, and it includes an internal bypass to reduce heat and losses after start-up. Built-in motor protection functions (adjustable trip class and overload protection) and condition monitoring capabilities simplify commissioning and help plan maintenance. Optional, pluggable communication modules are available for fieldbus integration to support plant-level monitoring and diagnostics. This configuration is suited to heavy-duty applications such as large pumps, compressors and conveyors where controlled ramp-up, reduced mechanical stress and integrated motor protection are required.

Key Soft Starter Attributes