3RW5227-1AC14, Soft Starter, 45 kW, 93 A, 200 to 480V AC

Siemens 3RW52 Soft Starter Series – Overview

Siemens 3RW52 soft starters are high-performance motor starting solutions designed for demanding industrial applications requiring precise and reliable control of three-phase asynchronous motors. The 3RW52 series focuses on reducing mechanical stress, limiting inrush current, and supporting higher motor power ratings with advanced protection functions compared to compact soft starters. With robust construction and enhanced motor protection capabilities, Siemens 3RW52 soft starters are well suited for heavy-duty applications such as large pumps, compressors, conveyors, mixers, and industrial process machinery where dependable motor starting and operational reliability are critical.

Product Description: 3RW5227-1AC14

The Siemens 3RW5227-1AC14 is a SIRIUS 3RW52 soft starter rated for 93 A (Ie) with a standard motor rating of 45 kW at 400 V (standard connection) and up to 90 kW when used in an inside-delta connection. It is designed for three-phase supplies from 200 V to 480 V AC (50/60 Hz) and uses an 110–250 V AC control supply. Typical motor compatibility includes industrial motors in the 30–60 kW band on 400 V systems (45 kW nominal), and larger motors when configured in inside-delta, making this unit suitable for heavy-duty applications such as large pumps, compressors, conveyors and mixers. Verified model features include three-phase control for balanced starting, an integrated bypass contactor to reduce heat and power loss after start, an analog output for monitoring (0–10 V / 4–20 mA variants available in the family), and built-in motor protection functions such as overload monitoring and adjustable start current. Optional plug-in communication modules (PROFINET, PROFIBUS, Modbus TCP) and HMI modules are available for system integration and local control. This configuration is aimed at engineers and procurement teams who need a compact but capable soft starter for industrial motor starting with proven protection and integration options.

Key Soft Starter Attributes