3RW5226-1AC14, Soft Starter, 37 kW, 77 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: 3RW5226-1AC14

The Siemens 3RW5226-1AC14 is a SIRIUS 3RW52 hybrid soft starter specified for up to 77 A rated operational current and a nominal motor rating of 37 kW at 400 V (standard delta/star connection). It is designed for 3-phase supply voltages from 200 to 480 V and uses three-phase control to manage motor start and limit inrush current. The unit accepts a 110–250 V AC control supply and includes an integrated bypass (hybrid switching) to reduce internal heating and improve efficiency during run. Built-in motor protection functions include overload detection with an adjustable trip class, making the starter suitable for heavy-duty industrial loads such as large pumps, compressors and conveyor drives. The starter also provides an analog output option and supports plug-in communication modules (PROFINET, PROFIBUS, Modbus TCP/RTU, Ethernet/IP) for integration into automation systems. With an IP00 enclosure rating and screw-terminal connections on this SKU, this model is intended for panel or cabinet mounting in industrial control panels where a compact hybrid soft starter with bypass and motor protection is required.

Key Soft Starter Attributes