Siemens Industry Online Support
Siemens AG
Entry type: Download Entry ID: 101494917, Entry date: 12/17/2019

Simulation Tool for Soft Starters (STS)

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Simulation Tool for Soft Starters (STS) for Windows and App version (for Android and iOS) are now available for download.

Simulation Tool for Soft Starters (STS) V4.0.2.2 for Windows

What’s new in Simulation Tool for Soft Starters (STS) V4.0.2.2? 

  • Minor improvements and error corrections

What’s new in Simulation Tool for Soft Starters (STS) V4.0.2.0?

  • Support of 3RW55 Failsafe soft starters
  • Support of 3RW50 soft starters
  • Improvement in Thermal load calculation

  • Update in UL feeder main components

  • Improvement in External bypass function calculation

  • Removal of 3RW44 soft starters from the suggestion list

  • Removal of 3RW40 S6-S12 soft starters from the suggestion list

  • Minor improvements and error corrections

Installation Notes: 

For the installation of STS V4.0.2.2 please download and run the file STS_V4_0_2_2_Setup.exe. A menu-prompted setup program guides you through the installation procedure for STS V4.0.2.2.

Please make sure that no other setup or update process is running while installing STS.

Additional information regarding the installation can be taken from the readme files.

Terms of Use:

By downloading the software application you accept the SIEMENS End User License Agreement for software applications:

 Registrierung notwendig  EULA_Software_Applications.zip (88,0 KB)

Important notes:

The main goal of this software is the correct selection of a soft starter for a respective application. For the correct parameter setting of the soft starter please refer to the user manuals and operating instructions.

STS template note:

If you are not permitted to install any software or if you have any difficulties with the simulation, you can download the STS template and enter the motor and load data. When you have done so, send the completed template back to our Support Request page https://support.industry.siemens.com/My/ww/en/requests. You will then be sent the simulation results by email.

Third-party software - Licensing terms and copyright information

You can find the copyright information for third-party software contained in this product, particularly open source software, as well as applicable licensing terms of such third-party software in the STS_ReadMe_OSS file.

Special information for resellers

The information and the license terms in the STS_ReadMe_OSS file must be passed on to the purchasing party to avoid license infringements by the reseller or purchasing party.

 Registrierung notwendig  STS_Readme_OSS_V4_0_2_2.zip (31,7 KB)  (multiple languages)


 Registrierung notwendig  STS_V4_0_2_2_Setup.exe (176,2 MB)
SHA-256 checksum:   Registrierung notwendig  Code_STS_V4_0_2_2_Setup.txt (1 KB) *

Readme Files (multiple languages):
 Registrierung notwendig  Readme_V4_0_2_2.zip (290,1 KB)

STS Template for Motor and Load Data:
 Registrierung notwendig  STS_Template_Motor_Load_data_20191108.xls (122,0 KB)
SHA-256 checksum:  Registrierung notwendig  Code_STS_Template_Motor_Load_data_20191108.txt (1 KB) *

Information about SHA-256:  109483101 

Simulation Tool for Soft Starters (STS) App for Android and iOS



  • Simulate a soft starter application based on your input data:
    • Environment & supply
    • Motor
    • Load
    • Starting parameters for the application
    • Additional functions
    • Starting profile
  • Select a suggested soft starter
  • Generate a report for a selected soft starter with the summary of the simulation and optional feeder main components
  • Direct access to selected soft starter data in the Siemens Industry Mall
  • Metrics: SI and Imperial
  • Languages: English, German, Chinese, Italian, Spanish, French, Portuguese, Turkish and Czech

STS App will be continuously improved and updated like the desktop version. In the coming versions we will be adding new features to match the desktop version completely.

Terms of Use:

By downloading the app for iOS or Android you accept the SIEMENS End User License Agreement for mobile applications:

Open Source components:

All open source components can be accessed here:  Registrierung notwendig  STS_App_Readme_OSS.zip (25,2 KB) 

You should have your operating system up to date. Siemens provides app updates for the up-to-date version of the operating system. Older versions of the operating system may no longer be supported.

Security information
In order to protect technical infrastructures, systems, machines and networks against cyber threats, it is necessary to implement – and continuously maintain – a holistic, state-of-the-art IT security concept. Siemens’ products and solutions constitute one element of such a concept. For more information about cyber security, please visit