Cisco N55-PAC-750W
Nexus 5500 PS, 750W, Front to Back Airflow
Product Highlights
What's Included
Keeping your data center switches powered and resilient shouldn't be complicated — but a failed or mismatched power supply can take an entire top-of-rack deployment offline. The Cisco N55-PAC-750W is a 750-watt AC power supply module engineered specifically for the Cisco Nexus 5500 Series, including the Nexus 5548P and Nexus 5548UP switches.
This hot-swappable PSU delivers reliable, high-efficiency power with a front-to-back (port-side exhaust) airflow pattern that integrates seamlessly into standard data center cooling architectures. With a universal 100–240V AC input range and 50–60 Hz frequency support, the N55-PAC-750W deploys effortlessly in facilities worldwide — no step-down transformers or regional SKUs required.
Designed for 1+1 redundancy, two N55-PAC-750W modules can be installed in a single Nexus 5500 chassis to ensure uninterrupted operation if one supply fails. Built-in Power Factor Correction (PFC) further optimizes energy consumption, helping reduce operating costs. Whether you're provisioning a new Nexus 5500 deployment or sourcing a replacement PSU for an existing switch, the N55-PAC-750W provides the dependable power foundation your network infrastructure demands.
Note: The Cisco Nexus 5500 Series has reached End-of-Sale status. This power supply remains a critical spare for organizations maintaining existing Nexus 5500 installations.
Features & Benefits
Hot-Swappable Redundant Power
The N55-PAC-750W is fully hot-swappable, allowing field replacement without powering down the switch or disrupting live traffic. Install two units in a 1+1 configuration to achieve power redundancy — if one PSU fails, the second seamlessly carries the full load, protecting against unplanned downtime.
Front-to-Back Airflow Cooling
Engineered with a front-to-back (port-side exhaust) airflow pattern, this PSU aligns with industry-standard hot-aisle/cold-aisle data center designs. Proper airflow direction is critical for thermal management; mismatched airflow modules can cause hot spots and premature component failure. Always match PSU airflow direction with your fan tray configuration.
Universal AC Input
Supporting an input voltage range of 100–240V AC at 50–60 Hz, the N55-PAC-750W operates on virtually any commercial power grid worldwide. This eliminates the need for region-specific power supply SKUs and simplifies global spare-parts inventory management.
Energy-Efficient Operation
Built-in Power Factor Correction (PFC) reduces reactive power draw and improves overall electrical efficiency. This translates directly into lower utility costs and reduced thermal load on your facility's cooling infrastructure — savings that compound across large-scale deployments.
Deployment Scenarios
Nexus 5500 Redundant Power Provisioning
Deploy two N55-PAC-750W modules in a Nexus 5548P or 5548UP switch to achieve 1+1 power redundancy. This configuration ensures the switch remains operational during a PSU failure or when performing planned power maintenance, meeting uptime SLAs in production data center environments.
Emergency Spare / Break-Fix Replacement
Maintain the N55-PAC-750W as a critical spare in your parts inventory for rapid replacement of failed power supplies in existing Nexus 5500 deployments. Hot-swap capability means the switch stays online during the swap, minimizing service disruption.
Data Center Airflow Standardization
In facilities using a front-to-back (cold-aisle intake, hot-aisle exhaust) cooling strategy, the N55-PAC-750W ensures the power supply airflow matches the chassis fan direction. This is essential for maintaining consistent thermal performance across the rack.
General
Electrical
Cooling
Compatibility
Compliance
Lifecycle
Compatibility Notes
Compatible Platforms
- Cisco Nexus 5548P (N5K-C5548P-FA)
- Cisco Nexus 5548UP (N5K-C5548UP-FA)
Airflow Direction
- This PSU uses front-to-back (port-side exhaust) airflow. Ensure your chassis fan trays match this airflow direction. The reverse-airflow variant is the N55-PAC-750W-B (back-to-front).
Important Notes
- The Cisco Nexus 5500 Series has reached End-of-Sale (last order date: May 5, 2019). This PSU is available as a replacement/spare for existing installations.
- Each Nexus 5548P/5548UP chassis supports two power supply slots for 1+1 redundancy.
Downloads & Resources
Frequently Asked Questions
| Part Number | Product | Key Difference |
|---|---|---|
| N55-PAC-750W-B | Nexus 5500 750W AC PSU (Back-to-Front) | Reverse airflow direction (back-to-front / port-side intake) for opposite cooling configurations |
| N55-PDC-750W | Nexus 5500 750W DC PSU (Front-to-Back) | DC input (-40 to -72 VDC) variant for facilities with DC power distribution |
| N55-PAC-1100W | Nexus 5500 1100W AC PSU | Higher 1100W output capacity for Nexus 5596UP or heavily loaded configurations |
| N55-PAC-1100W-B | Nexus 5500 1100W AC PSU (Back-to-Front) | 1100W with reverse airflow — for Nexus 5596UP in back-to-front cooling environments |