3RW5234-6AC14, Soft Starter, 55 kW, 113 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: 3RW5234-6AC14

The Siemens 3RW5234-6AC14 is a SIRIUS 3RW52 motor soft starter rated for 113 A nominal operational current and specified for a 200–480 V AC main supply. At 400 V it is rated for 55 kW motor power (example ratings at 230 V: 30 kW standard circuit, 55 kW when connected in delta), making it suitable for medium‑to‑large three‑phase asynchronous motors used in pumps, compressors, conveyors and other continuous industrial processes. This model uses three‑phase control and provides selectable/current‑limited start behaviour (adjustable start current) together with the Soft‑Torque function to reduce mechanical shock and smooth torque buildup during starting. The device includes an integrated bypass to reduce internal heating and standby losses after start, built‑in electronic motor protection (overload monitoring) and supports optional communication modules (PROFINET, PROFIBUS, Modbus TCP) for system integration. Typical users include electrical engineers and procurement teams specifying reliable industrial motor starting for heavy‑duty plant equipment where reduced inrush, repeatable starts and motor protection are required.

Key Soft Starter Attributes