Siemens Soft Starters for Demanding Requirements

With its Sirius 3RW5 range, Siemens has launched a new generation of soft starters for simple to demanding motor requirements. This comprehensive range of devices for the soft starting of three-phase asynchronous motors from 7 to 1,600 hp enables efficient, seamless, and easy motor protection implementation.The new Sirius 3RW5 soft starters are suitable for any motor, they can be easily integrated into a new or existing automation system, and they supply data right up to MindSphere, the cloud-based, open IoT operating system of Siemens. Standard programming functions such as automatic parameterization, motor load ramp changes and electrical stabilization in the case of fluctuating- line voltages, all provide support for smooth motor operations in a myriad of applications.

The new harmonized Sirius 3RW5 soft starter generation offers the right features and accessories for all requirements and adapts for application-specific or user-specific modifications. The new soft starter can also be used with individual expansions

such as operator panels with and without display (HMIs), or communication via Profinet/Profibus and Modbus.

The Sirius 3RW5 soft starters can be used in a host of applications thanks to specific functions – from pumping, ventilating and compressing, to moving and processing. In addition, they feature special functions such as starting time monitoring, automatic parameterization depending on motor startup, pump stop to avoid pressure peaks in piping systems, and condition monitoring with warning and alarm limits. They are also designed to be electrically rugged to fluctuations in line voltages.


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