The ABB 1MRK002239-BBR01 (SR91C790) is a high-reliability power supply module engineered for use within the Relion® series and other modular protection and control systems. It provides stable DC voltage to internal electronic components, ensuring consistent performance of protection relays and bay control units under fluctuating substation conditions.

 

ABB 1MRK002239-BBR01 | SR91C790 | Power Supply Module

 

Operating Precautions

• Input Voltage Verification: Before energizing, confirm the input source matches the specific voltage range printed on the module’s side label.
• Hot-Swap Safety: Ensure the rack is designed for live insertion before replacing the module; otherwise, power down the subrack to prevent arcing.
• Thermal Management: Do not block the ventilation slots on the front panel or the rear of the rack, as the power supply generates heat during conversion.
• Grounding: Ensure the subrack frame is properly grounded to the station earth to dissipate transients and electromagnetic noise.

Common Questions (Q&A)

Q: Can this power supply handle both AC and DC inputs? A: Yes, most variants of the SR91C790 are designed with a universal input stage that accepts a wide range of both AC and DC auxiliary voltages.

Q: Does it have built-in short-circuit protection? A: Yes, the module includes automatic electronic short-circuit and overload protection to prevent damage to the backplane.

Q: What is indicated if the “Power OK” LED is off? A: This typically indicates a loss of input voltage, an internal fuse failure, or an output overload condition that has tripped the protection circuit.

 

Recommended Similar Models

1. ABB 1MRK002239-AB (Alternative voltage variant)
2. ABB 1MRK002133-BA (Communication/Power hybrid)
3. ABB PS910 (Redundant power supply unit)
4. ABB 1MRK002239-CBR01 (High-wattage version)
5. ABB CP-C.1 24/10.0 (Standard DIN-rail power supply)