3RW5526-1HA14, Soft Starter, 37 kW, 77 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: 3RW5526-1HA14

The Siemens 3RW5526-1HA14 is a SIRIUS 3RW55 soft starter specified for medium‑to‑large three‑phase motors. It has a rated operational current of 77 A and is specified for motor power up to 37 kW at 400 V (and 22 kW at 230 V under standard connection). The main supply voltage range is 200–480 V AC, with the control supply rated at 110–250 V AC. Typical motor compatibility includes pumps, fans and conveyor drives in industrial plants where a 37 kW class motor is used at 400 V. Verified built‑in features for this SKU include an internal bypass (shunt) and integrated motor overload protection, and the unit is supplied with screw-type terminals. The 3RW5526-1HA14 is therefore suitable for applications that require controlled, low‑stress starts and a compact heavy‑duty soft starter with basic motor protection and a bypass contact for reduced thermal loading during run.

Key Soft Starter Attributes