3RW5534-6HA14, Soft Starter, 55 kW, 113 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: 3RW5534-6HA14

The Siemens 3RW5534-6HA14 is a SIRIUS 3RW55-series motor soft starter rated for 113 A (Ie) with an operating voltage range of 200–480 V AC. At standard connection the unit is specified for up to 55 kW at 400 V (30 kW at 230 V), and supports higher inside-delta ratings where applicable. This voltage class and current rating make the 3RW5534-6HA14 suitable for medium-to-large three-phase motors commonly used in industrial pumps, fans, conveyors and compressors. Key verified functional capabilities include voltage-ramp soft starting and torque-control starting methods, an internal bypass contactor for reduced running losses, integrated motor overload protection and condition monitoring features for preventive diagnostics. Control-supply voltage for the device is 110–250 V AC, and the product is supplied with screw terminals. These verified characteristics make the 3RW5534-6HA14 appropriate where controlled ramp-up, reduced mechanical stress and built-in monitoring are required to protect both motor and driven equipment.

Key Soft Starter Attributes