Siemens Sitras PRO CU | Central Unit A5E03920570

The Siemens Sitras PRO CU (Part Number A5E03920570) is the high-performance central processing unit at the heart of the Sitras PRO protection and control system. Specifically engineered for DC traction power supply systems in railway applications, this unit provides the computational power required for high-speed protective functions, energy measurement, and extensive diagnostic capabilities. It ensures the safety of the DC feeder and catenary systems by detecting faults such as short circuits or overloads with extreme precision.

Product Specifications and Datasheet

  • Model Number: Sitras PRO CU / A5E03920570

  • System Platform: Sitras PRO DC Protective Device

  • Processor: High-speed digital signal processor for real-time protection

  • Communication Interfaces: Ethernet (IEC 61850, Modbus TCP), RS485, and specialized system bus

  • Sampling Rate: High-frequency sampling for precise Di/Dt (Rate of Rise) protection

  • Operating Voltage: 24V DC to 250V DC (System dependent power supply module)

  • Operating Temperature: -25°C to +70°C

  • Dimensions: Standard modular housing for subrack mounting

  • Weight: 1.35 kg

  • Country of Origin: Germany

Application Areas

  • Mass Transit: Protection for DC third-rail systems in metro and subway networks.

  • Tram and Light Rail: Feeder protection and energy monitoring for overhead catenary lines.

  • Mainline Railway: High-speed DC traction power substations for regional rail.

  • Industrial DC Grids: Specialized protection for high-power DC distribution in mining or heavy manufacturing.

Siemens Sitras PRO CU Central Unit A5E03920570

Product Instructions for Use

  1. Installation: Slide the Sitras PRO CU module into the dedicated central slot of the Sitras PRO subrack. Ensure the rear connectors are perfectly aligned with the backplane before applying firm pressure to seat the module.

  2. Configuration: Connect a PC to the front-panel Ethernet or serial service port. Use the Sitras PRO configuration software to define protective parameters, including current thresholds and Di/Dt trip curves.

  3. Commissioning: Perform a secondary injection test to verify that the CU correctly interprets signal inputs and initiates the “Trip” command to the high-speed DC circuit breaker (HSCB).

  4. Data Retrieval: Utilize the integrated web server or SCADA interface (IEC 61850) to download event logs and fault oscillograms for post-event analysis.

Q&A: Frequently Asked Questions

Q1: What protective functions are performed by the Central Unit? A1: The CU handles critical functions including Imax (instantaneous overcurrent), Di/Dt (rate-of-rise protection), thermal overload, and undervoltage/overvoltage monitoring.

Q2: Is the A5E03920570 version compatible with older Sitras systems? A2: The A5E03920570 is specifically designed for the Sitras PRO modular platform. It is not directly interchangeable with legacy Sitras MDS or Sitras PCI hardware without a system upgrade.

Q3: How does the unit handle time synchronization? A3: The Sitras PRO CU supports SNTP (Simple Network Time Protocol) and IRIG-B, ensuring that all event logs and fault recordings are timestamped with millisecond accuracy across the entire substation network.

Recommended Similar Models

  • Sitras PRO CM: Communication Module used for expanding networking capabilities.

  • Sitras PRO DA: Digital/Analog I/O module for interfacing with field contacts and sensors.

  • Sitras PRO PSU: Dedicated power supply module for the Sitras PRO subrack.

  • A5E00843642: Legacy component within the Sitras DC protection family.

  • Sitras S7: Siemens PLC-based control system often used in conjunction with Sitras PRO for substation automation.

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