The ABB 1MRS050396 CPU1 is a high-performance central processing unit (CPU) board designed specifically for the Distribution Control Unit (DCU) series. This module serves as the primary intelligence for protection and control relays within the REF, REM, or RET series of the Relion family (often associated with the REF541/543/545 series). The board, marked with the manufacturing date or circuit reference 13082012, is responsible for executing protection algorithms, managing communication protocols, and supervising the overall health of the substation automation hardware.

Product Specifications

• Model Number: 1MRS050396 CPU1
• Product Type: Central Processing Unit (CPU) Board
• Module Role: DCU Main Controller / Processor Module
• Clock Speed: High-speed processing for real-time protection execution
• Communication Support: Integrated ports for SPA, LON, or IEC 60870-5-103 protocols
• Firmware Storage: Non-volatile memory for protection settings and event logs

 

Dimensions and Physical Attributes

• Length: 21.0 cm
• Width: 15.5 cm
• Height: 2.4 cm
• Weight: 0.48 kg
• Country of Origin: Finland

 

Application Fields

The 1MRS050396 CPU1 is widely utilized in medium-voltage electrical substations and industrial power distribution networks. It is the core component in feeder protection relays, motor protection units, and transformer management systems. Its ability to process fault data in milliseconds makes it essential for utility companies and heavy industries—such as mining and oil refineries—where preventing electrical damage and ensuring grid stability are paramount.

 

Product Usage Instructions

Installation of the ABB 1MRS050396 requires a powered-down relay chassis to ensure safety and signal integrity. The board should be inserted into the designated CPU slot of the DCU rack, ensuring the multi-pin backplane connectors are perfectly aligned to avoid bent pins. Use a torque-limited screwdriver to secure the front panel screws. Once installed, the board must be flashed with the correct firmware version corresponding to the specific relay model (e.g., REF543). Configuration should be performed via ABB’s CAP 505 or PCM600 software tools to load the protection parameters and communication settings.

 

Frequently Asked Questions Q&A

Q: Can this CPU1 board be used to upgrade an older DCU relay? A: Yes, provided the hardware revision is compatible with the existing power supply and I/O modules. Firmware must be carefully matched to the hardware version.

Q: What should I do if the “IRF” (Internal Relay Fault) LED is lit after installation? A: An IRF LED usually indicates a self-test failure or a firmware mismatch. Check the diagnostic logs via the communication port to identify the specific error code.

Q: Does the board retain settings during a power outage? A: Yes, all protection settings and configuration parameters are stored in non-volatile memory and do not require a constant power supply to be maintained.

 

Related Product News

ABB continues to support the legacy 1MRS series through its dedicated lifecycle management program, offering refurbished modules and expert repair services. As substations move toward the IEC 61850 standard, these CPU boards are often fitted with communication gateways to allow older DCU units to talk to modern digital switchgear. Recent industry trends show a strong focus on “Hardening” these CPU modules against electromagnetic interference (EMI), ensuring that boards like the 1MRS050396 remain reliable even in environments with high electrical noise.

 

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