3RW5076-6AB14, Soft Starter, 250 kW, 470 A, 200 to 480V AC

Siemens 3RW50 Soft Starter Series – Overview

Siemens 3RW50 soft starters are high-performance motor starting solutions designed for demanding industrial applications requiring reliable control of three-phase asynchronous motors. The 3RW50 series focuses on reducing mechanical stress, limiting inrush current, and supporting higher motor power ratings compared to compact soft starters. With robust construction and advanced motor protection capabilities, Siemens 3RW50 soft starters are well suited for heavy-duty applications such as large pumps, compressors, conveyors, mixers, and industrial process machinery where dependable motor starting is critical.

Product Description: 3RW5076-6AB14

The Siemens 3RW5076-6AB14 is a SIRIUS 3RW50 series soft starter specified for medium‑to‑large three‑phase motors. It has a rated operational current of 470 A (rated at 40 °C) and is specified for motor power up to 250 kW at 400 V AC (with additional documented ratings at other voltages). The device accepts a supply voltage range of 200...480 V AC and uses a control supply of approximately 110...250 V AC. Typical motor compatibility covers large pumps, compressors, conveyors and other heavy process machinery in industrial motor starting applications where limiting inrush and reducing mechanical stress are required. Verified functional highlights for this SKU include adjustable voltage ramp (soft start) and ramp‑down (soft stop), adjustable current limitation and pump ramp‑down, built‑in bypass contact, and integrated motor protection functions including electronic motor overload and thermistor (PTC/Klixon) evaluation. Starting and stopping times are adjustable (0…20 s), making the unit suitable where controlled acceleration/deceleration and reduced mechanical shock are required.

Key Soft Starter Attributes