Digsi 491 Download Verified [2021] - Siemens
I understand you're looking for a verified download of Siemens DIGSI 4.91 (likely a typo for "491").
Here’s the helpful, verified answer:
- DIGSI 4 (including version 4.91) is not available for public download from Siemens' free public web portals (like Industry Online Support).
- It is license-protected software for configuring Siemens SIPROTEC 4 protective relays.
- Verified source: You must obtain it via the Siemens Industry Mall after purchase, or through your Siemens account with a valid software contract / license key.
- For existing customers: Log into the Siemens Service & Support Portal → "My Software Downloads" → search for "DIGSI 4.91".
- Unverified third-party sites offering direct downloads are not safe – they often contain malware or corrupted installers.
If you cannot access it through your Siemens account, contact Siemens technical support with your license details or order number – they will provide the official download link. siemens digsi 491 download verified
Step 1: Obtain a Valid License Entitlement
You cannot download DIGSI 491 without proof of purchase or active maintenance. Options:
- New license: Purchase through Siemens Industry Mall or an authorized distributor (e.g., Rexel, Graybar, Radwell).
- Maintenance contract: If you have SW (software) maintenance, you are entitled to downloads.
- Trial for evaluation: Siemens offers 14-day trials to registered business entities (requires corporate email).
2. The Supply Chain Risk
Downloading "cracked" or unofficial versions of DIGSI often bypasses the licensing requirements (hardware keys/dongles). However, these cracks modify the binary code of the software. If the software calculating the settings for a high-voltage transformer relay is corrupted, it could lead to misconfigurations, potentially causing equipment failure or safety hazards. I understand you're looking for a verified download
Part 2: The Problem with "Free Download" Links
A quick Google search for "siemens digsi 491 download" reveals dozens of suspicious links—uploaded to file sharing sites like Mediafire, Mega.nz, or obscure engineering forums. Why are these dangerous?
Step 4: The "Verified" Checkpoint
After downloading the .exe or .zip file, do not run it yet. Perform these verification actions: DIGSI 4 (including version 4
| Verification Method | What to check |
|---------------------|----------------|
| Digital Signature | Right-click file → Properties → Digital Signatures → Should show "Siemens AG" valid. |
| File Size | Should be approx. 1.8 GB to 2.2 GB (exact size varies by SP level). |
| SHA-256 | Use PowerShell: Get-FileHash .\DIGSI491.exe. Match to SIOS listing. |
Only proceed if all three pass.
Part 4: Step-by-Step Installation Verification
Download verification is only half the battle. You must also verify the installation.