3RW4024-1BB14, Soft Starter, 5.5 kW, 12.5 A, 200 to 480V AC

Siemens 3RW40 Soft Starter Series – Overview

Siemens 3RW40 soft starters are advanced compact motor starting solutions designed for smooth starting and stopping of three-phase asynchronous motors in industrial applications. The 3RW40 series focuses on reducing mechanical stress, limiting inrush current, and providing enhanced motor protection compared to basic soft starters. With integrated bypass functionality and flexible configuration options, Siemens 3RW40 soft starters are well suited for pumps, fans, compressors, conveyors, and general industrial machinery requiring reliable and efficient motor starting.

Product Description: 3RW4024-1BB14

The Siemens 3RW4024-1BB14 is a SIRIUS 3RW40 motor soft starter rated for 12.5 A and specified for a motor power rating of 5.5 kW (reference rating at 400 V). It is designed for three-phase supply voltages from 200 to 480 V AC, making it suitable for common industrial voltage classes. Typical motor compatibility includes small to medium three-phase asynchronous motors used on pumps, fans, compressors and conveyor drives where a 5.5 kW rating or nearby frame sizes apply. This SKU features two‑phase (polarity balancing) control to minimise DC components during starting, integrated bypass contacts to remove semiconductor losses after start-up, and built-in device protection functions to reduce the need for separate overload protection. The unit accepts a control supply on screw terminals (110–230 V AC/DC as supplied in this product configuration) and is supplied in an IP20 enclosure for panel mounting. Use cases include replacing DOL or wye–delta starting for reduced mechanical shock, limiting inrush current on weak supplies, and providing a compact soft start solution where panel space is limited.

Key Soft Starter Attributes