SIRIUS Soft Starter S2 72A 45kW 400–600V AC

Description for SIRIUS Soft Starter S2 72A 45kW 400–600V AC

The SIRIUS 3RW4038‑1BB15 from Siemens is a high-performance S2 class soft starter, expertly engineered to smoothly ramp up and down three-phase asynchronous motors, reducing mechanical stress and electrical load. It supports up to 72 A nominal current (at 40 °C) and powers motors up to 45 kW at 500 V, within a 400–600 V AC supply range.

Equipped with both 110–230 V AC/DC control input and robust screw terminals, this soft starter ensures easy installation and reliable operation. Its integrated bypass contact system minimizes heat dissipation in the control cabinet, while built-in monitoring functions provide protection against overheating and motor overload.

Designed for industrial performance, it features a compact housing (55 × 160 × 170 mm), IP20-rated front panel protection, and universal mounting options. It delivers motor performance equivalent to around 60 hp (≈45 kW) at higher voltages and is certified under IEC and UL/CSA standards, making it suitable for use in hazardous areas (ATEX/IEC Ex).

Ideal for applications that require reduced inrush current, extended motor life, and intelligent overload protection—such as pumps, fans, conveyors, and compressors—the 3RW4038-1BB15 offers reliable performance and seamless integration into the Siemens SIRIUS modular system.