Siemens SIRIUS 3RW4457-2BC34 Soft Starter - 780A (460V), Phased Out

The Siemens SIRIUS soft starter, model 3RW4457-2BC34, is a high-performance device designed for smooth motor acceleration and deceleration. It is rated for standard operation at 780A at 460V (50°C) and 1351A at 460V (50°C) for inside-delta connections, supporting motor power up to 700 hp (standard) or 1200 hp (inside-delta). This unit operates on AC voltages from 200-460V with a 115V AC control supply and features spring-type terminals. Please note this is a phased-out product.

This soft starter is crucial for reducing mechanical stress on machinery and electrical inrush currents during motor startup. It finds applications in heavy-duty industrial settings such as conveyor systems, pumps, compressors, and fans where controlled acceleration is vital for equipment longevity and energy efficiency.

Stanlo Automation, a veteran-owned surplus distributor, provides access to legacy and current industrial automation parts. While the 3RW4457-2BC34 is phased out, Stanlo can help you source this or its recommended successor, the 3RW5556-2HA14, ensuring your operations continue with reliable Siemens components.