3RW3038-1BB14, Soft Starter, 37 kW, 72 A, 200 to 480V AC

Siemens 3RW30 Soft Starter Series – Overview

Siemens 3RW30 soft starters are compact and cost-effective motor starting solutions designed for basic soft starting of three-phase asynchronous motors in standard industrial applications. The 3RW30 series focuses on reducing mechanical stress and limiting inrush current during motor start-up, providing a simple and reliable alternative to direct-on-line starting. With a straightforward design and easy commissioning, Siemens 3RW30 soft starters are well suited for pumps, fans, compressors, conveyors, and other simple motor-driven machines where basic motor starting control is sufficient.

Product Description: 3RW3038-1BB14

The Siemens 3RW3038-1BB14 is a SIRIUS 3RW30 soft starter sized S2, rated for 72 A and specified for motors up to 37 kW at 400 V (22 kW at 230 V). It is designed for supply voltages from 200 to 480 V AC and accepts a control supply of 110–230 V AC/DC, making it suitable for global 50/60 Hz installations. Typical motor compatibility includes three‑phase asynchronous motors in the 22–37 kW range (depending on system voltage), which covers medium-duty pumps, fans, compressors and conveyor drives commonly found in manufacturing, water treatment and HVAC systems.

This model uses thyristor-based power switching and includes an internal bypass contactor to reduce dissipation once the motor is up to speed — a practical feature that lowers heat loss during continuous operation. The unit is intended for panel mounting with screw terminals and is rated for operation up to 40 °C ambient without derating. The 3RW3038-1BB14 is therefore a straightforward choice when you need a reliable, compact motor soft starter to reduce mechanical stress and limit inrush current on motors in standard industrial applications.

Key Soft Starter Attributes