Cisco PWR-4450-AC
AC Power Supply for Cisco ISR 4450 and ISR4350
Product Highlights
What's Included
Unplanned downtime from a failed power supply can bring an entire branch office to a standstill. The Cisco PWR-4450-AC eliminates that risk with a robust, hot-swappable 450W AC power supply purpose-built for the Cisco ISR 4450 and ISR 4350 Integrated Services Routers.
Designed as an internal plug-in module, the PWR-4450-AC accepts a universal input voltage of 100–240V AC, making it suitable for deployments worldwide. Its hot-swap capability means you can replace or install the unit without powering down the router — a critical advantage in environments where every minute of uptime counts.
For organizations that demand the highest availability, the ISR 4451-X and ISR 4351 chassis support dual power supply bays, allowing you to install a second PWR-4450-AC (or the PWR-4450-AC/2 secondary unit) for full 1+1 power redundancy. Whether you're refreshing a failed PSU, building out a new branch router, or adding redundancy to an existing deployment, the PWR-4450-AC delivers the reliable, efficient power your Cisco ISR 4000 Series infrastructure requires.
Features & Benefits
Reliable 450W Power Delivery
The PWR-4450-AC provides 450 watts of clean, regulated AC power to the Cisco ISR 4451-X and ISR 4351 routers. This output is sufficient to drive the router chassis, installed service modules, NIMs, and connected peripherals under full load — ensuring stable operation even in demanding branch-office configurations.
Hot-Swappable Design
Engineered for zero-downtime maintenance, the PWR-4450-AC can be removed and replaced while the router is running (when a redundant PSU is installed). This hot-swap capability is essential for enterprise and service-provider environments where scheduled maintenance windows are narrow and service interruptions are costly.
1+1 Power Redundancy
The Cisco ISR 4451-X and ISR 4351 chassis each support two power supply slots. By installing a second 450W AC power supply, you achieve full 1+1 redundancy — if one PSU fails, the other seamlessly takes over with no impact to traffic or services. This is a best practice for mission-critical WAN edge deployments.
Universal AC Input
With a wide input voltage range of 100–240V AC at 50–60 Hz, the PWR-4450-AC operates on virtually any standard power grid worldwide. There is no need for external voltage converters or region-specific SKUs, simplifying global procurement and inventory management.
Deployment Scenarios
Branch Office Router Power Replacement
When an existing power supply in a Cisco ISR 4451-X or ISR 4351 fails or degrades, the PWR-4450-AC serves as a direct, drop-in replacement. Its hot-swap design allows field technicians to restore full power without a maintenance window or service disruption.
Adding Power Redundancy to WAN Edge Routers
For branch or campus WAN edge routers that currently operate on a single PSU, adding a second PWR-4450-AC provides 1+1 redundancy. This is a cost-effective way to dramatically improve uptime for sites running business-critical applications like voice, video, and SD-WAN.
New ISR 4000 Series Deployment
When building out new Cisco ISR 4451-X or ISR 4351 routers for greenfield sites, the PWR-4450-AC is the standard AC power supply option. Paired with the included AC power cord, it provides everything needed to power the router from day one.
General
Power
Physical
Environmental
Compatibility Notes
Compatible Platforms
- Cisco ISR 4451-X (ISR4451-X/K9)
- Cisco ISR 4351 (ISR4351/K9)
Related Power Supply SKUs
- PWR-4450-AC= — Spare/orderable version of this power supply
- PWR-4450-AC/2 (PWR-4450-AC-2) — Secondary 450W AC power supply for the second PSU slot
- PWR-4450-DC — 437W DC power supply alternative for DC-powered environments
- PWR-4450-POE-AC — 1000W AC power supply with integrated PoE module
Notes
- This is the primary (slot 0) AC power supply. For the secondary slot, order the PWR-4450-AC/2.
- Confirm chassis compatibility before ordering; this PSU does not fit the ISR 4431, ISR 4331, ISR 4321, or ISR 4221.
Downloads & Resources
Frequently Asked Questions
| Part Number | Product | Key Difference |
|---|---|---|
| PWR-4450-AC/2 | Cisco 450W AC Secondary Power Supply | Secondary PSU for the second slot — use alongside PWR-4450-AC for 1+1 redundancy |
| PWR-4450-DC | Cisco 437W DC Power Supply for ISR 4450/4350 | DC input variant (–48 to –60 VDC) for telco or DC-powered environments; 437W output |
| PWR-4450-POE-AC | Cisco 1000W AC Power Supply with PoE for ISR 4450/4350 | Higher-wattage (1000W) AC PSU with integrated PoE module for powering PoE endpoints |
| PWR-4430-AC | Cisco AC Power Supply for ISR 4431 | Designed for the smaller ISR 4431 chassis — not interchangeable with ISR 4451-X/4351 |