Siemens Digsi 4.91 Download May 2026

If you absolutely cannot obtain DIGSI 4.91, consider these alternatives:

You might ask: If Siemens has DIGSI 5, why cling to 4.91? siemens digsi 4.91 download

The answer is legacy infrastructure. Thousands of substations worldwide still run SIPROTEC 4 relays installed between 2005 and 2015. These relays are built to last 20+ years. Replacing a working SIPROTEC 4 relay with a new SIPROTEC 5 relay costs $5,000–$15,000 per unit plus engineering hours. If you absolutely cannot obtain DIGSI 4

Consequently, utilities need DIGSI 4.91 for: Cost: A new single-user license for DIGSI 4

| Feature | Description | |---------|-------------| | Compatible relays | SIPROTEC 4 (7SA6, 7SJ6, 7UT6, 7SD6, etc.), older SIPROTEC 3/4 Compact | | Operating systems | Windows 7, 8.1, 10 (32/64-bit – some limitations on 64-bit for USB drivers) | | Key functions | Relay parameterization, protection settings, fault record analysis (DIGSI 4), CFC logic, IEC 61850 configuration | | Communication | Serial (RS232), USB, Ethernet (IEC 61850, Profibus, Modbus) | | Database format | DIGSI 4 project database (.d4p) |

Siemens distributes DIGSI under a paid license model. To download DIGSI 4.91:

Cost: A new single-user license for DIGSI 4 (if still sold) typically ranges from €1,500 to €3,000 depending on the feature set (Basic vs. Professional).