SIRIUS Soft Starter 200-600 V 18 A, AC 110-250 V screw terminals. The SIRIUS 3RW55 soft starter is a high-performance device designed for demanding applications that require 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, is maintenance-free, and easy to handle.

The integrated bypass enables a very compact design, saves energy, and results in lower heating within 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. Thanks to the three-phase control, it is particularly suitable for large motor powers and root-3 circuits.

The innovative torque control ensures optimal motor acceleration. Simple and quick commissioning is possible through auto-parameterization or an application assistant. Predictive maintenance planning is supported by condition monitoring. A detachable HMI with a color display provides clear measurement and diagnostic displays.

The soft starters are globally certified (e.g., IEC and UL/CSA) and available for networks up to 690 V in a power range up to 560 kW with 24 V or 110-250 V control supply voltages, consistently featuring screw and spring-loaded connections. An analog output and thermistor motor protection are integral parts of the high-performance soft starters. Optional plug-in communication modules allow for connection via PROFINET, PROFIBUS, and Modbus TCP. The built-in HMI module can also be mounted in the control cabinet door.

The 3RW55 soft starters replace the proven 3RW44 series. SIRIUS 3RW5 soft starters - as flexible as your task.