3RW5514-1HA14, Soft Starter, 7.5 kW, 18 A, 200 to 480V AC

Siemens 3RW55 Soft Starter Series – Overview

Siemens 3RW55 soft starters are heavy-duty motor starting solutions designed for high-power industrial applications requiring robust and reliable control of three-phase asynchronous motors. The 3RW55 series focuses on reducing mechanical stress, limiting inrush current, and supporting very high motor power ratings with advanced motor protection and monitoring capabilities. With a rugged design and suitability for demanding operating conditions, Siemens 3RW55 soft starters are well suited for large pumps, compressors, crushers, conveyors, mills, and other heavy industrial machinery where dependable motor starting and long-term reliability are critical.

Product Description: 3RW5514-1HA14

The Siemens 3RW5514-1HA14 is a Sirius 3RW55 series motor soft starter rated for an operational current of 18 A and designed for three‑phase supply voltages from 200 to 480 V AC. It supports typical motor ratings of 4 kW at 230 V and 7.5 kW at 400 V (standard connection), making it suitable for medium‑power industrial motors used on pumps, small compressors, conveyor drives and similar driven equipment. The unit accepts a control supply (Us) of 110–250 V AC and is provided with screw‑type main and control terminals for straightforward wiring. For procurement and engineering teams this model offers a compact, field‑proven soft start solution where controlled starting torque, reduced mechanical stress and inrush current limitation are required on motors up to the listed power ratings.

Key Soft Starter Attributes