As versatile as your application

3RW soft starters

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  • soft start! SIRIUS soft starters are the best solution when direct-on-line or star/delta starting are not suitable for three-phase motors, because mechanical impacts in the machine or voltage dips in the power supply system can often cause problems. A full and comprehensive range of soft starters with intelligent functions offers a softer alternative for almost every application.

Go directly to the technical data of all our 3RW soft starters

Industry Mall

Soft starter Portfolio

High Performance

5,5-1.200 kW

SIRIUS 3RW55 soft starter High Performance

Due to its exceptional functionality, the intelligent SIRIUS 3RW55 soft starter can solve even the most difficult starting and stopping tasks simply and particularly gently. Integrated smart functions (for example, pump cleaning, pump stopping, automatic parameterization, condition monitoring) help operators to run their pumps smoothly. Thanks to the SIRIUS 3RW55 Failsafe soft starters with integrated Safe Torque Off (STO) functionality, safety-related applications can also be realized.

 

  • Three-phase controlled for optimal motor start
  • Integrated, safety-related shutdown for SIL 1/PL c and SIL 3/PL e (with STO)
  • ATEX/IECEx-certified for use in hazardous areas
  • Engineering in the TIA Portal
  • A wide range of communications interfaces (PROFINET, PROFIBUS, EtherNet/IP, Modbus)
  • Direct communication into cloud based solutions via OPC UA
  • Motor control and diagnostic data via a standard web browser without additional software
  • Integrated HMI (Human-Machine-Interface) with colour display
  • Media redundancy for reliable network availability
  • Integration in the process control system PCS 7 V9.0 SP2 with the 3RW5 block library
SIRIUS 3RW55 soft starters

SIRIUS 3RW55
SIRIUS 3RW55 Failsafe soft starters

SIRIUS 3RW55 Failsafe

General Performance

5,5-560 kW

SIRIUS 3RW52 soft starter General Performance

The SIRIUS 3RW52 soft starter is an ideal alternative to star-delta starters. As an all-rounder, it covers all drive types.

 

  • Three-phase controlled for optimal motor start
  • Parameterization with rotary potentiometer
  • A wide range of communications interfaces (PROFINET, PROFIBUS, EtherNet/IP, Modbus)
  • HMI (Human-Machine-Interface) with display optional 
  • Engineering in the TIA Portal
  • Integration in the process control system PCS 7 V9.0 SP2 with the 3RW5 block library
Sanftstarter SIRIUS 3RW52

SIRIUS 3RW52

Basic Performance

1,5-315 kW

SIRIUS 3RW30/3RW40/3RW50 soft starter Basic Performance

Thanks to their compact design, SIRIUS 3RW30/40/50 soft starters are the ideal solution for all standard applications.

 

  • Two-phase controlled for standard applications
  • Parameterization with rotary potentiometer
  • Optional communications interface (PROFINET, PROFIBUS, EtherNet/IP, Modbus)
  • Visualization of motor data via optional HMI or analog output
  • Integrated motor overload and intrinsic device protection
  • Engineering in the TIA Portal
  • ATEX/IECEx-certified for use in hazardous areas
SIRIUS 3RW30 soft starters

SIRIUS 3RW30
SIRIUS 3RW40 soft starters

SIRIUS 3RW40
SIRIUS 3RW50 soft starters

SIRIUS 3RW50

Starter Kit "High Performance"

Test it now

Plug and play: install the software and set the parameters!

Test the new generation of 3RW55 soft starters and simply experience how easy commissioning is. With the SIRIUS Soft Starter ES software, you can set parameters, monitor and perform diagnostics for service tasks quickly and easily. You can set the device parameters of the 3RW55 directly from your PC or laptop.

Starter Kit 3RW55 - order here!

Simulation Tools

Select and simulate

Simulation Tools

You can use the Simulation Tool for Soft Starters (STS) to select the right devices for your application – as a desktop application or optimized for your mobile device. Your selection is then automatically transferred to the Siemens Industry Mall ready for ordering via a link.

 

To the Simulation Tool for Soft Starters (STS)

Tutorial STS: How do I select the right 3RW soft starter for my application?

 

SIRIUS Sim enables an easy and quick test of functions and parameterizations at your desk. Afterwards, the parameterization can be downloaded into the real devices.

• Full parameterization of the high performance SIRIUS 3RW55 soft starters

• Complete navigation with the same menu structure of the 3RW5 high feature HMI

• Optional storage of the parameterization in a micro SD card to be downloaded afterward in the real device

• Simulation of startup, ramp down and operational phases as well as different error conditions

 

To the SIRIUS Sim

Hybrid Event, Nov 23 - Nov 25

SPS 2021 in Nuremberg – There for you

Come to our booth at the SPS in Nuremberg from November 23 to 25, 2021, where you can network with others in person, check out exhibits, and find solutions to problems. All of this will take place, of course, in line with a safety and hygiene concept that complies with the latest regulations.

 

If you can’t attend in person, simply participate online and take a virtual tour of our 3D showroom, attend lectures and presentations, and talk to our experts.

 

More information

News around soft starters

Soft starting in hazardous areas

For motors used in mining, mills and other dusty environments, or when pumping gasoline, kerosene and gases, a certified motor overload protection must reduce the risk of explosion to a minimum.

Fail-safe shutdown of soft starters

Stopping machines in safety-oriented applications quickly and reliably

Digitalization of the water industry

How can we ensure water supply and wastewater disposal in times of urbanization and climate change?

Space-saving drives for roller conveyors

Enormous masses are moved in rolling mills. Nevertheless, it is still possible to set up a compact drive solution in the control cabinet using flexible devices.

Short downtimes in the woodworking industry

Stop woodworking machines quickly with SIRIUS soft starters. During debarking or sawing, sluggish systems must be able to start up and shut down without loss of time.

Connecting and controlling electrical pumps

A whole range of products and options can be chosen to start and control pumps. But which pump drive is suitable for which application?
Discover more applications

SIRIUS Media Center

Highlights at a glance

Overview of 3RW soft starters

3RW55 soft starters media redundancy

One considerable advantage of SIRIUS 3RW55 soft starters is their media redundancy thanks to the new Profinet High Feature communication module and its integrated Ethernet switch. It provides a ring topology in which communication can be maintained via a second port even if the power fails.

EtherNet/IP

SIRIUS 3RW55 soft starter communicates now addionally with EtherNet/IP. This means it is able to communicate with a wide range of process control systems.

Electrical ruggedness

All SIRIUS soft starter have a wide-range voltage versions, so that even if there is a voltage dip, the continued operation of the soft starter, the motor and the application is ensured. This level of electrical ruggedness means that operation is secured even in power supply systems with sporadic voltage dips.

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