3RW5547-6HA14, Soft Starter, 250 kW, 470 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: 3RW5547-6HA14

The Siemens 3RW5547-6HA14 is a high‑performance SIRIUS 3RW55 motor soft starter specified for heavy industrial motor starting. This SKU is rated for a supply voltage range of 200–480 V AC with a nominal operational current of 470 A and a typical motor power rating of 250 kW at 400 V. The unit accepts a control/auxiliary supply of 110–250 V AC. Designed for large three‑phase asynchronous motors, the 3RW5547-6HA14 is suitable for demanding applications such as large pumps, compressors, conveyors and fans where controlled starting torque, reduced mechanical stress and inrush current limitation are required. Verified built‑in features include an integrated bypass to reduce internal heating and losses during run, motor protection functions including thermistor input and overload monitoring, and a slot for optional communication modules (PROFINET, PROFIBUS, Modbus TCP) and an HMI module for local measurement and diagnostics. The starter supports three‑phase control and adjustable start current/torque behaviour, delivering predictable starting performance for high‑power industrial installations.

Key Soft Starter Attributes