3RW5247-6AC14, Soft Starter, 250 kW, 470 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: 3RW5247-6AC14

The Siemens 3RW5247-6AC14 is a SIRIUS 3RW52 soft starter rated for 470 A service current and designed for 200–480 V AC supply systems. The unit is compatible with typical industrial motor sizes up to 250 kW in standard (delta) connection at 400 V and up to 132 kW at 230 V (standard connection). When using a star-delta configuration the device supports higher motor power ratings (for example 400 kW at 400 V and 250 kW at 230 V as specified for the model). Control supply for the starter is 110–250 V AC, and the device includes an internal bypass contactor to reduce thermal stress and conduction losses after the motor is up to speed. Built-in motor protection functions include adjustable tripping/class settings and overload protection. Typical applications for the 3RW5247-6AC14 are heavy-duty three-phase motor starting in large pumps, compressors, conveyors and industrial process machinery where limiting inrush current, reducing mechanical wear during start, and reliable overload protection are required. Standout, verified features for this SKU include an integrated bypass, analog output capability, and an IP00 enclosure rating intended for panel mounting.

Key Soft Starter Attributes