ABB CP-A RU Redundancy Unit 1SVR427071R0000 | 24VDC 40A Power Redundancy Module

ABB CP-A RU Redundancy Unit - Uninterrupted Power for Mission-Critical Systems

The ABB CP-A RU Redundancy Unit (1SVR427071R0000) delivers true power redundancy for industrial control systems where downtime is not an option. Engineered to combine two independent 20A power supplies into a single 40A output, this intelligent redundancy module ensures continuous operation even when one power source fails, making it essential for critical automation infrastructure.

Key Technical Specifications

• Input Configuration: Dual 24VDC inputs, 20A each
• Output Capacity: 24VDC, 40A combined (20A per channel)
• Redundancy Type: Active N+1 with automatic failover
• Decoupling Method: MOSFET-based with reverse polarity protection
• Voltage Drop: <0.5V at full load
• Operating Temperature: -25°C to +70°C
• Mounting: Standard 35mm DIN rail
• Dimensions: 45mm width, compact profile for dense cabinet layouts
• Status Indication: LED diagnostics for each input channel

Real-World Application Scenarios

This redundancy unit excels in environments where power continuity directly impacts production uptime and safety compliance. Manufacturing facilities deploy it to protect PLC systems controlling assembly lines, preventing costly production halts from single power supply failures. Water treatment plants rely on it to maintain SCADA system operation during equipment maintenance, ensuring regulatory compliance and public safety.

In pharmaceutical production, the CP-A RU safeguards batch control systems where power interruptions could compromise product quality and trigger expensive waste. Offshore oil platforms use it to maintain critical monitoring systems in harsh environments where component replacement is logistically complex and time-sensitive.

System Integration & Architecture

The CP-A RU integrates seamlessly with ABB's CP-series power supplies to create robust redundant architectures. When paired with the CP-E 24/20.0 Power Supply or CP-C 24/20.0 Power Supply, it forms a complete N+1 redundant power solution with hot-swap capability.

System designers appreciate the module's MOSFET-based decoupling technology, which eliminates the voltage drop and heat generation associated with traditional diode-based redundancy modules. This efficiency advantage becomes significant in high-current applications where every tenth of a volt matters for downstream device operation.

The unit works in conjunction with the CP-A CM Control Module to provide advanced monitoring and alarm functions, enabling predictive maintenance strategies that identify failing power supplies before they impact operations.

Frequently Asked Questions

Q: How does the automatic failover mechanism work?
A: The CP-A RU continuously monitors both input channels. If one supply drops below threshold voltage or fails completely, the MOSFET decoupling instantly isolates the failed channel while maintaining full output from the remaining supply, with transition time under 1 millisecond.

Q: Can I hot-swap a failed power supply without shutting down the system?
A: Yes, the redundancy architecture specifically enables hot-swap replacement. Once a failure is detected via LED indication, you can safely disconnect and replace the failed supply while the system continues running on the remaining channel.

Q: What's the advantage of MOSFET decoupling over traditional diode ORing?
A: MOSFET technology reduces voltage drop from typical 0.7V (diode) to less than 0.5V, significantly improving efficiency and reducing heat generation. This matters especially in systems with tight voltage tolerances or high current demands.

Q: Is this compatible with power supplies from other manufacturers?
A: While designed for ABB CP-series supplies, the CP-A RU works with any 24VDC power source rated up to 20A per channel, provided they meet standard industrial power supply specifications for output regulation and ripple.

Warranty & Technical Support

Every ABB CP-A RU Redundancy Unit includes a comprehensive 12-month manufacturer warranty covering defects in materials and workmanship. Our engineering team provides pre-sales application support to ensure proper system sizing and configuration, plus post-installation troubleshooting assistance to maximize uptime.

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