Cisco PWR-4320-AC
AC Power Supply for Cisco ISR 4320
Product Highlights
What's Included
When a branch-office router loses power, every connected user, VPN tunnel, and voice call goes down with it. Keeping a reliable, genuine power supply on hand — whether as a proactive spare or a direct replacement — is essential to maintaining uptime across your WAN infrastructure.
The Cisco PWR-4320-AC is the standard AC power supply designed for the Cisco ISR 4320 series of Integrated Services Routers. It accepts a wide-range AC input of 100–240V at 47–63 Hz, making it suitable for deployment in any region without manual voltage configuration. The external form factor allows for straightforward field replacement, minimizing mean time to repair and keeping your network operational.
Built with integrated overload protection and surge suppression, the PWR-4320-AC safeguards your router against electrical faults and voltage irregularities common in distributed branch environments. Its energy-efficient design helps reduce power consumption and thermal output — a meaningful advantage in wiring closets and compact telecom rooms where cooling capacity is limited. Whether you're provisioning a new ISR 4321 deployment or stocking a critical spare for your existing Cisco ISR 4000 infrastructure, the PWR-4320-AC delivers the dependable, Cisco-engineered power your network demands.
Features & Benefits
Wide-Range AC Input
The PWR-4320-AC supports an input voltage range of 100–240V AC at 47–63 Hz, automatically adapting to local power standards. This universal compatibility eliminates the need for step-down transformers or region-specific SKUs, simplifying global procurement and deployment.
Integrated Power Protection
Built-in overload protection and surge suppression guard the router against voltage spikes, brownouts, and electrical faults. These safeguards help extend the operational life of your ISR 4320 and reduce the risk of unplanned downtime caused by power anomalies.
External Form Factor
The external power supply design allows for quick, tool-free replacement without disassembling the router chassis. This reduces mean time to repair (MTTR) and makes it practical to keep pre-staged spares at remote sites for rapid recovery.
Energy-Efficient Operation
Engineered for low power consumption and reduced heat dissipation, the PWR-4320-AC helps keep operating costs down in environments where cooling and electricity budgets are constrained. Less waste heat also contributes to longer component life across the router platform.
Deployment Scenarios
Branch Office Router Deployment
Power a new or existing Cisco ISR 4321 at a branch location with a genuine Cisco AC power supply. The auto-ranging input ensures compatibility with local power infrastructure at any site worldwide, simplifying multi-site rollouts.
Critical Spare for Network Resilience
Stock the PWR-4320-AC as a pre-positioned spare at regional depots or on-site in wiring closets. When a power supply fails, a ready replacement dramatically reduces downtime and avoids emergency procurement delays.
Lab and Staging Environments
Equip test labs and staging racks with dedicated power supplies for Cisco ISR 4320 routers. Having spares on hand ensures lab environments stay operational without borrowing components from production inventory.
General
Electrical
Physical
Compatibility Notes
Compatible Platforms:
- Cisco ISR 4321 (ISR4321/K9)
Notes:
- This is the standard AC (non-PoE) power supply. If your deployment requires Power over Ethernet support for connected devices, consider the PWR-4320-POE-AC variant instead.
- The PWR-4320-AC is an external power supply unit. No internal chassis modification is required for installation.
Downloads & Resources
Frequently Asked Questions
| Part Number | Product | Key Difference |
|---|---|---|
| PWR-4320-POE-AC | AC Power Supply with PoE for ISR 4320 | Adds Power over Ethernet (PoE) support for powering connected devices such as IP phones and access points via Ethernet ports. |
| PWR-4330-AC | AC Power Supply for ISR 4330 | Designed for the larger Cisco ISR 4331 chassis; not interchangeable with the ISR 4321. |
| PWR-4320-AC= | PWR-4320-AC (Spare) | Same power supply sold as a standalone spare part SKU (with '=' suffix) for ordering outside of a router bundle. |