3RW5535-6HA14, Soft Starter, 75 kW, 143 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: 3RW5535-6HA14

The Siemens SIRIUS 3RW5535-6HA14 is a high-feature industrial motor soft starter rated for 143 A nominal operating current and configured for three-phase supplies from 200 to 480 V AC. At standard 400 V supply the unit is specified for 75 kW motor power (the same model is specified with lower power at 230 V), making it suitable for medium-to-large squirrel-cage induction motors used in heavy-duty applications such as large centrifugal pumps, compressors, conveyor drives and other continuous-process machinery. The device accepts a 110–250 V AC control supply, includes an internal bypass to reduce power loss during steady-state operation, and provides integrated motor protection functions (adjustable overload protection and protections for fault conditions such as overvoltage/ground fault as specified by the manufacturer). Practical for procurement and engineering teams, this SKU features screw terminal main connections and an IP00 enclosure rating for panel mounting; its feature set (soft start, controlled stop/braking, reversing capability and built-in motor protection) is aimed at reducing mechanical stress, limiting starting inrush and improving uptime in demanding industrial motor starting and ramp-down scenarios.

Key Soft Starter Attributes