The ABB SR91C790 (1MRK002239-BBR02) is a specialized power supply module designed for high-reliability protection and control systems. It converts input voltage into stable DC power for internal electronic circuits, ensuring continuous operation of substation automation and industrial control hardware under varying electrical conditions.

Parameters

• Model Number: SR91C790

• Ordering Code: 1MRK002239-BBR02

• Input Voltage: Wide-range AC/DC input (typically 110-250V)

• Output Voltage: Regulated DC internal bus voltage

• Power Rating: Standardized for 1MRK series racks

• Mounting Type: Plug-in module for backplane integration

Specifications

• Manufacturer: ABB

• Series: Protection and Control IEDs

• Cooling: Natural air convection

• Enclosure Rating: IP20 (when installed in rack)

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

• Compliance: IEC 60255 / IEEE standards

Applications

• Substation Automation: Powering IEDs and protection relays.

• Power Utilities: Critical infrastructure monitoring and control.

• Industrial Control: Integration into large-scale DCS architectures.

• Renewable Energy: Control systems for wind and solar grid connections.

Q&A

• Q: Is the SR91C790 compatible with all 1MRK series racks?

  • A: It is designed for specific hardware generations; check the backplane pin configuration before installation.

• Q: Does this module include internal fuse protection?

  • A: Yes, it features built-in overcurrent and short-circuit protection for the internal circuitry.

• Q: Are there status indicators on the unit?

  • A: The front panel typically includes LED indicators to signal “Power OK” or “Internal Fault” status.