Cisco PWR-3900-AC=

Overview

The Cisco PWR-3900-AC= is a hot-plug power supply designed specifically for Cisco 3925 and 3945 Series Integrated Services Routers. It delivers up to 400 watts of AC power, ensuring that your router can continuously support voice, video, and data services without interruption. Its wide input voltage range from 100 to 240 volts AC makes it adaptable for use in various global office environments.

Key features

• Hot-plug capability allows you to install or replace the power supply without shutting down the router, minimizing downtime.
• Supports up to 400 watts of power to maintain stable operation of Cisco 3925, 3925E, 3945, and 3945E routers under demanding workloads.
• Wide input voltage range accommodates different regional power standards, making it ideal for global deployments or hardware relocation.
• Plug-in module design fits directly into the router’s power bay, enabling quick and secure installation.
• Enables adding a second power supply for redundancy or replacing an aging unit to maintain network reliability.

Key specs

• Power output: 400 watts AC
• Compatible models: Cisco 3925, 3925E, 3945, 3945E routers
• Input voltage range: 100 to 240 volts AC
• Installation type: Hot-plug, plug-in module

Connectivity and compatibility

This power supply is engineered to integrate seamlessly with Cisco 3925 and 3945 Series routers, ensuring compatibility with existing hardware and network configurations. Its hot-plug design means it can be added or replaced without disrupting ongoing network operations, which is critical for maintaining uptime in business environments.

Ideal uses and environments

The PWR-3900-AC= is well suited for branch offices and enterprise networks that rely on Cisco 3900 Series routers to deliver uninterrupted voice, video, and data services. It is a strong choice for IT teams needing to add power redundancy or quickly restore power supply functionality without scheduling downtime. Its global voltage compatibility also makes it practical for organizations with international deployments or hardware moves.

Orders are processed within 2 business days, which includes verification, packing, and dispatch. Shipping costs are calculated at checkout based on destination, total weight, and selected speed. Free shipping applies to carts over $100 (excluding heavyweight items). All available options and final pricing are clearly shown before payment so you can choose the service that best fits your needs.

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Providing an accurate shipping address helps prevent delays, and changes may be limited once the order has been dispatched. P.O. boxes are supported only when permitted by the selected carrier. Packaging and handoff are optimized to protect items during transit, though oversized or high-weight products may require special handling. All shipping methods and any related constraints are clearly shown during checkout.

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Returns are accepted within 30 days of delivery. Items must be unused, in the same condition received, with tags, manuals, accessories, and original, unaltered packaging. Any item kept will be deducted from the refund. Start a return by sending us an email. Items sent back without approval may be refused or returned to the sender.

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After inspection, refunds are issued to the original payment method; allow 5–7 business days for the credit to post. Shipping, handling, customs duties, and import taxes are nonrefundable. If an item is used, incomplete, or not in original condition, a 30% restocking fee may apply. Direct exchanges are not offered; purchase the replacement and return the original for a refund.

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If you need warranty service, please file the claim directly with the manufacturer. They may require proof of purchase, the product serial number, original packaging, photos, or basic troubleshooting. Some brands ask you to register the product or obtain a case number before shipping it for repair or replacement. We don’t submit or approve claims, but we can point you to the correct support links and contact details.

Keep your invoice and packaging in a safe place, and report any functional issues to the manufacturer as soon as they appear. If you’re unsure whether a problem is covered, the manufacturer’s support team can confirm next steps and timelines. While we cannot intervene in decisions or outcomes, we’re happy to provide purchase documentation or guidance so you can move through the warranty process smoothly.

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