HPE 865434-B21

Overview

The HPE 865434-B21 is an 800 watt Flex Slot power supply designed for ProLiant and Apollo servers that use a -48 V DC power feed. It delivers up to 94 percent energy conversion efficiency, which helps reduce electricity costs and minimizes heat output in server racks. Its compact size and hot plug capability make it easy to install and maintain without interrupting server operation, fitting well in data centers, telecom facilities, and cloud hosting environments where uptime and energy efficiency are critical.

Key features

• High energy efficiency of up to 94 percent reduces power consumption and cooling requirements.
• Flex Slot form factor saves space inside Gen10, Gen10 Plus, and Gen11 servers, allowing room for additional components.
• Hot plug support enables replacement or maintenance without shutting down the server, ensuring continuous operation.
• Low halogen construction supports environmental initiatives by reducing hazardous materials.
• Wide operating temperature range from 41 to 131 degrees Fahrenheit and humidity tolerance up to 95 percent ensure reliable performance in demanding environments.
• Compact dimensions make handling and installation straightforward during maintenance tasks.

Key specs

• Power output: 800 watts DC
• Input voltage: -48 V DC
• Energy conversion efficiency: up to 94 percent
• Dimensions: 6.80 x 4.04 x 22.53 centimeters
• Operating temperature range: 41 to 131 degrees Fahrenheit
• Relative humidity support: up to 95 percent
• Compatibility: HPE ProLiant and Apollo Gen10, Gen10 Plus, and Gen11 servers

Connectivity and compatibility

This power supply is specifically designed to fit HPE Flex Slot bays in ProLiant and Apollo servers across multiple generations, ensuring seamless integration. Its -48 V DC input matches the power infrastructure commonly found in telecom and cloud data centers, making it a natural choice for facilities relying on this standard.

Performance and reliability

With a high conversion efficiency, this unit reduces wasted energy and heat generation, which contributes to lower operational costs and improved server longevity. The hot plug feature allows IT teams to replace or service the power supply without downtime, supporting mission-critical applications that demand constant availability.

Ideal uses and environments

This power supply is well suited to data centers, telecom facilities, and edge computing sites where -48 V DC power is standard. It also fits research labs and high-performance computing clusters that require reliable power delivery and quick serviceability to avoid unexpected interruptions. Its low halogen design aligns with organizations aiming to meet environmental standards.

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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Returns are accepted within 30 days of delivery. Items must be unused, in the same condition received, and include all tags, manuals, accessories, and original, unaltered packaging. To start a return, please email us for approval. Items sent back without approval may be refused or returned to the sender. If any item is kept, its value will be deducted from the refund.

Non-returnable items include opened TVs, combos, or monitors 37″ or larger, opened computers or software, electronic downloads, opened consumables (film, paper, bulbs, media, ink), custom or modified computers, special-order or “nonreturnable” items, submerged underwater gear, and opened educational media.

After inspection, refunds are issued to the original payment method. Please allow 5–7 business days for the credit to post. Shipping and handling are nonrefundable. If an item is used, incomplete, or not in its original condition, a 30% restocking fee may apply. Direct exchanges are not offered. To exchange an item, please purchase the replacement separately 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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