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Sirius Have a Range of Versatile Soft Starters
to Suit Any Application up to 1,200kW

Sirius 3RW5 soft starters are a great solution when direct or star-delta starting isn't an option for your three-phase motors (due to mechanical impact in the machine or voltage drops in the line supply). They feature intelligent functions which make them suitable for almost any application, starting your motors smoothly, easily and efficiently.

To create reliable machines, Sirius 3RW5 soft starters offer you intelligent functions such as automatic parameterisation, pump cleaning and condition monitoring. So if you’re designing a new machine, we can support you with sophisticated solutions for pumps, compressors, fans, and conveyor belts, or with process development; regardless of whether your machine is intended for the automotive, wastewater, or the food and beverage industry.

Video; Sirius 3RW5 - The right soft starter to make your life easier.

Background Info

  • Sirius 3RW5 soft starters for three-phase asynchronous motors from 5.5 to 1,200 kW
  • Hybrid switching technology for efficient switching, energy saving and long service life
  • Applications include pumps, ventilation, compressors, moving & processing
  • Comprehensive range with matching hardware & options for your requirements


Benefit along the entire value chain

The digital transformation of industry continues to advance. Data plays a significant role and also simplifies planning and engineering. The Simulation Tool for Soft Starters (STS) helps users easily select the necessary devices specific to their application.

With the TIA Selection Tool, you can configurator and select the products for your project. The Sirius Soft Starter ES engineering tool based on the TIA Portal lets you quickly and easily parameterise, monitor, and diagnose your Sirius soft starters. The device parameters can also be set directly on a PC and transferred to the soft starter via Ethernet cable or a PROFINET connection.

Connecting our soft starters to MindSphere, Siemens cloud-based, open IoT operating system, gives you further options; cross-plant diagnostics, convenient process optimisation, plant-wide access to control data, as well as process and measured values, predictive maintenance, energy data management, and resource optimisation.

Application Specific Functions

The new 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 parameterisation depending on motor start up, 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.

Hybrid Switching Technology

Sirius 3RW5 soft starters are fitted with modern hybrid switching technology to ensure efficient switching and energy-saving operation. This enables low-wear switching, extends the service life of the devices and provides mechanical protection for the drive train. The soft starting ensures that the devices avoid current peaks in the power supply system. All in all, using Sirius 3RW5 devices enhances the reliability of the application and increases the cost efficiency of the system.

Siemens Sirius 3RW Product Portfolio
With its Sirius 3RW5 range, Siemens has a soft starter for any application, enabling efficient and future-proof machine concepts to be implemented easily and cost-effectively.

Looking for more information? We can help with that...

If you're looking for more information about this - or any other Siemens product, you have come to the right place. You can download a copy of the brochure on the right or call our Technical Support Engineers on 01254 685900, they will be happy to help.

Siemens Launch 3RW5 Soft Starters



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