3RW5544-6HA14, Soft Starter, 132 kW, 250 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: 3RW5544-6HA14

The Siemens 3RW5544-6HA14 is a SIRIUS 3RW55 high-performance motor soft starter rated for 250 A continuous operation and specified for up to 132 kW three-phase motors at 400 V (75 kW at 230 V). Designed for line voltages from 200 to 480 V AC, the unit accepts a control/auxiliary supply of 110–250 V AC and comes with screw-type control terminals. This model is intended for large industrial motors used in applications such as heavy-duty pumps, compressors, conveyors and other machinery where reduced mechanical stress and controlled torque during start-up are required. Verified features for this SKU include three-phase (torque) control for optimized starts, an integrated bypass contactor to minimise heat loss during run, built-in motor overload protection (including thermistor support), and an IP00 enclosure rating for panel-mounted installation. Optional plug-in communication modules (PROFINET, PROFIBUS, Modbus TCP) and a detachable HMI are supported across the 3RW55 family for condition monitoring and diagnostics when networked or locally monitored.

Key Soft Starter Attributes