3RW5527-1HA14, Soft Starter, 45 kW, 93 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: 3RW5527-1HA14

The Siemens 3RW5527-1HA14 is a SIRIUS 3RW55 high-performance soft starter specified for a rated operational current of 93 A and a nominal motor power rating of 45 kW (standard switching at 400 V). It is designed for supply systems in the 200–480 V AC voltage class and uses a 110–250 V AC control supply. Typical motor compatibility includes three-phase asynchronous motors in the 22–45 kW range for direct starting applications and higher effective power when using star-delta switching (manufacturer data shows higher star-delta ratings). This model is suitable for demanding industrial motor-starting tasks such as large pumps, fans, compressors and conveyors where reduced mechanical stress and controlled inrush are required. Standout, verified features for this SKU include three-phase control with torque regulation, adjustable maximum start current, an integrated bypass to reduce heat and save energy in the control cabinet, built-in thermistor-based motor protection/overload functions, and a detachable HMI for clear measured-value and diagnostic display. Optional plug-in communication modules (PROFINET, PROFIBUS, Modbus TCP) are available for system integration.

Key Soft Starter Attributes