3RW5074-6AB14, Soft Starter, 160 kW, 315 A, 200 to 480V AC

Siemens 3RW50 Soft Starter Series – Overview

Siemens 3RW50 soft starters are high-performance motor starting solutions designed for demanding industrial applications requiring reliable control of three-phase asynchronous motors. The 3RW50 series focuses on reducing mechanical stress, limiting inrush current, and supporting higher motor power ratings compared to compact soft starters. With robust construction and advanced motor protection capabilities, Siemens 3RW50 soft starters are well suited for heavy-duty applications such as large pumps, compressors, conveyors, mixers, and industrial process machinery where dependable motor starting is critical.

Product Description: 3RW5074-6AB14

The Siemens 3RW5074-6AB14 is a SIRIUS 3RW50 series soft starter rated for 315 A (at 40 °C) with motor power ratings up to 160 kW at 400 V (and 90 kW at 230 V). It is designed for use on three-phase supplies from 200 to 480 V AC and supports both 50 Hz and 60 Hz operation. This model is suitable for starting and stopping larger industrial motors such as those used on pumps, compressors, conveyors and mixers where controlled ramp-up, ramp-down and reduced mechanical stress are required. Key verified functions for the 3RW5074-6AB14 include voltage ramp (soft start) and ramp-down (soft stop), adjustable current limitation, Soft Torque and pump ramp-down, plus intrinsic device protection and full motor overload protection (electronic overload and evaluation of thermistor/PTC inputs). The unit features an integrated bypass contactor, an analog output (configurable as 4–20 mA default or 0–10 V with HMI), and is compatible with a range of communication modules (PROFINET, PROFIBUS, Modbus TCP/RTU, Ethernet/IP) and HMI modules for status, configuration and diagnostics. These features make the 3RW5074-6AB14 a practical choice for engineering teams and procurement looking for a robust soft starter that combines motor protection, flexible control and fieldbus integration for industrial motor starting applications.

Key Soft Starter Attributes