3RW5546-6HA14, Soft Starter, 200 kW, 370 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: 3RW5546-6HA14

The Siemens 3RW5546-6HA14 is a SIRIUS 3RW55 high-performance motor soft starter rated for heavy industrial duty. Verified factory data for this SKU shows a rated operational current of 370 A with a three-phase supply voltage range of 200–480 V AC and a control/supply (auxiliary) voltage of 110–250 V AC. At 400 V the unit is specified for a rated motor power of 200 kW (inline rating), making it suitable for large motors in pump, compressor, conveyor and other heavy-duty applications where controlled acceleration and reduced mechanical stress are required. The 3RW5546-6HA14 includes an internal bypass to reduce internal losses after start and provides built-in motor overload protection (thermistor/overload functionality and supervisory monitoring as supplied by Siemens and authorized distributors). Optional plug-in communication modules (PROFINET, PROFIBUS, Modbus TCP) allow integration into plant networks for remote monitoring and parameterization. Engineers and procurement teams will find this model appropriate when an inline soft start solution is needed for motors up to the verified 200 kW (400 V) class, where site integration and condition monitoring via optional fieldbus modules are required.

Key Soft Starter Attributes