Cisco NXA-PAC-650W-PE
Nexus NEBs AC 650W PSU - Port Side Exhaust
Product Highlights
What's Included
Keeping your data center infrastructure powered reliably is non-negotiable — and an unexpected PSU failure in a production switch can cascade into costly downtime. The Cisco NXA-PAC-650W-PE is a 650W AC power supply unit engineered for Cisco Nexus switches, delivering NEBs-compliant, carrier-grade power with port-side exhaust (back-to-front) airflow.
Designed as a hot-swappable, plug-in module, the NXA-PAC-650W-PE enables field replacement without service interruption when deployed in a redundant 1+1 configuration. Its port-side exhaust airflow direction is purpose-built for data centers using hot-aisle/cold-aisle containment strategies, ensuring that heated air is directed away from switch ports toward the rear exhaust.
With 80 Plus Platinum efficiency and a wide 100–240V AC input range, this PSU minimizes energy waste and supports global deployment without additional voltage conversion. Whether you're provisioning a new Nexus switch deployment or stocking spares for proactive maintenance, the NXA-PAC-650W-PE delivers the reliability and efficiency that enterprise and telecom environments demand. Each unit ships with one AC power cord, so it's ready to install out of the box.
Features & Benefits
NEBs-Compliant Reliability
The NXA-PAC-650W-PE meets NEBS (Network Equipment-Building System) compliance requirements, making it suitable for carrier-grade telecom central offices and enterprise data centers with strict environmental and safety standards. This ensures the PSU can withstand the thermal, vibration, and electrical conditions found in mission-critical deployments.
Port-Side Exhaust Airflow
Featuring a back-to-front (port-side exhaust) airflow pattern, this PSU draws cool air from the fan tray side and exhausts warm air through the port side. This design is optimized for hot-aisle containment data center layouts, ensuring consistent cooling performance across high-density racks.
Hot-Swappable Redundancy
The NXA-PAC-650W-PE is fully hot-swappable, allowing technicians to replace or add a power supply without shutting down the switch. When deployed in a 1+1 redundant configuration, the switch continues operating seamlessly on the remaining PSU during a swap, eliminating planned downtime for power maintenance.
Platinum-Rated Power Efficiency
Certified at 80 Plus Platinum efficiency, this power supply delivers at least 90% efficiency at typical loads. Higher efficiency translates directly to lower electricity costs, reduced heat generation, and decreased cooling requirements — all of which contribute to a lower total cost of ownership over the PSU's lifecycle.
Global AC Input Compatibility
With a 100–240V AC wide-range input at 50–60 Hz, the NXA-PAC-650W-PE operates on virtually any standard AC power source worldwide. This eliminates the need for step-down transformers or region-specific PSU variants, simplifying procurement and inventory management for multinational deployments.
Deployment Scenarios
Data Center Leaf/Spine Deployments
In modern data center leaf-spine architectures built on Cisco Nexus 9000 Series switches, the NXA-PAC-650W-PE provides efficient, redundant power with port-side exhaust airflow that aligns with hot-aisle containment cooling strategies. Deploying two PSUs per switch ensures N+1 redundancy for uninterrupted operations.
Telecom Central Office / Carrier-Grade Environments
NEBs compliance makes this PSU ideal for telecom central offices and carrier points of presence (PoPs) where equipment must meet rigorous environmental, seismic, and electrical standards. The 650W capacity supports fully loaded switch configurations in these demanding environments.
Proactive Spare Inventory
Maintaining cold spares of the NXA-PAC-650W-PE ensures rapid replacement in the event of a PSU failure. Because the unit is hot-swappable, a technician can restore full redundancy in minutes without scheduling a maintenance window or impacting production traffic.
General
Electrical
Cooling & Airflow
Physical
Environmental
Regulatory & Safety
Compatibility Notes
The NXA-PAC-650W-PE is designed for use with select Cisco Nexus 9000 Series and Nexus 3000 Series switches that support the 650W AC port-side exhaust power supply form factor. Confirmed compatible platforms include models such as the Nexus 93180YC-EX, Nexus 92304QC, Nexus 9300-FX/FX2/FX3 Series, and Nexus 3132C-Z.
Important: Always verify compatibility with your specific Nexus switch model and running NX-OS version before ordering. The airflow direction (port-side exhaust) must match the fan tray airflow direction installed in the chassis — do not mix exhaust and intake components.
The corresponding port-side intake variant is NXA-PAC-650W-PI.
Downloads & Resources
Frequently Asked Questions
| Part Number | Product | Key Difference |
|---|---|---|
| NXA-PAC-650W-PI | Nexus 650W AC PSU - Port Side Intake | Same 650W capacity but with port-side intake (front-to-back) airflow — choose based on your data center cooling layout |
| NXA-PAC-1100W-PE | Nexus 1100W AC PSU - Port Side Exhaust | Higher 1100W capacity for Nexus 9000 switches with greater power demands; same port-side exhaust airflow |
| NXA-PAC-500W-PI | Nexus 500W AC PSU - Port Side Intake | Lower 500W capacity with port-side intake airflow for Nexus 9000 switches with lighter power requirements |
| N9K-PAC-650W | Nexus 9000 650W AC PSU (Legacy) | Older-generation 650W PSU for Nexus 9000; NXA-PAC-650W-PE is the NEBs-compliant replacement with updated compliance |
