Siemens Sirius

SIRIUS Soft Starter 200-480 V 171 A, AC/DC 24 V screw terminals thermistor input. The SIRIUS 3RW50 Basic Performance soft starter is designed for simple applications requiring smooth starting and stopping of three-phase asynchronous motors. It allows for stepless starting, reduces current peaks, avoids voltage fluctuations during startup, relieves the power supply network, and decreases mechanical stress on the drive. Additionally, it offers significant space and wiring savings compared to star-delta starters and frequency converters, maintenance-free switching, and easy handling.

The integrated bypass enables a very compact design, saves energy, and ensures lower heating in the control cabinet. Intelligent monitoring functions protect the soft starter from overheating and the motor from overload. Furthermore, the current during startup can be limited to an adjustable maximum value. The innovative Soft-Torque function ensures a gentle motor startup. With the integrated remote reset, faults can be quickly and easily resolved from a distance.

Global approvals (e.g., IEC and UL/CSA) are also available for explosion-hazardous applications (ATEX or IEC Ex). The Basic Performance soft starters 3RW50 are available for networks up to 600 V in a power range up to 315 kW with 24 V or 110-250 V control supply voltages, consistently featuring screw and spring-loaded connections. Different device variants are available for analog output and thermistor motor protection. Optional communication modules enable connection via PROFINET, PROFIBUS, and Modbus TCP. Various HMI modules are available for installation in the control cabinet door.

The 3RW50 soft starters replace the proven 3RW40 series (size S6 to S12). SIRIUS 3RW5 soft starters - as flexible as your task.