3RW3028-1BB14, Soft Starter, 18.5 kW, 38 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: 3RW3028-1BB14

The Siemens 3RW3028-1BB14 is a SIRIUS 3RW30 soft starter rated for 38 A continuous output and specified for 18.5 kW motors at 400 V (11 kW at 230 V). It is designed for 3‑phase supply voltages from 200 to 480 V AC and uses a separate control supply rated 110–230 V AC/DC. The device uses two‑phase, continuous voltage control (voltage ramp) to limit starting torque and current, reducing mechanical stress and smoothing network load during start-up. The compact S0 frame and integrated bypass (jumper) contacts make it suitable for space‑constrained control panels. Typical applications include pumps, fans, small compressors and conveyors where straightforward, repeatable soft starting is required and no integrated motor overload protection is needed. Standout verified features for this SKU are its 38 A rating at 40 °C, the wide 200–480 V AC main voltage class, two‑phase continuous voltage control, integrated bypass contacts and IP20 enclosure for standard panel mounting.

Key Soft Starter Attributes