# Power Supply Unit HPE 865438-B21 800W 1U

**URL:** https://aio.lv/en/product--hp-enterprise-865438-b21-rfb--5289047
**Data updated:** 2025-12-08 08:28 (EET)
**Category:** Server Parts & Components
**Manufacturer:** HP Enterprise
**Manufacturer code:** 865438-B21-RFB
**Warranty:** 2 Years
**Availability:** Out of stock

## Summary description

The HPE 865438-B21 is an 800W power supply unit designed for servers. It operates on an AC input voltage of 200-240V and boasts an impressive efficiency of 96%, certified with 80 PLUS Titanium. This 1U form factor PSU ensures reliable power delivery and is ideal for enterprise-level applications, providing stability and performance for critical workloads.

## Long description

HPE Flexible Slot Power Supplies offer up to 96% energy efficiency with 80 Plus Titanium-certified options to reduce server power consumption and lower data center energy waste and costs. The compact form factor is 25% smaller than previous generations, freeing space for additional server options and improving overall server capability. Tool-less hot-plug access enables faster, simpler serviceability. These power supplies support HPE ProLiant Gen10, Gen10 Plus and Gen11 servers, selected HPE Apollo Gen10 and Gen10 Plus systems, and HPE Alletra 4100 storage servers, which helps streamline spare parts and reduce operational expenses.
Advantages
High efficiency (up to 96%) minimizes power losses and aligns with EU Lot 9 (EU Commission regulation 2019/424) efficiency requirements. The smaller 25% reduced form factor increases internal space for expansion and enhancements. Tool-less hot-plug design shortens maintenance time and simplifies replacements. Broad compatibility across ProLiant, Apollo, and Alletra platforms reduces the number of different spares required, simplifying inventory and lowering data center costs.
Key specifications
Efficiency: up to 96% (80 Plus Titanium options)
Form factor: 25% smaller than previous HPE Common Slot Power Supplies
Serviceability: tool-less hot-plug access
Compatibility: HPE ProLiant Gen10, Gen10 Plus, Gen11; selected HPE Apollo Gen10 & Gen10 Plus; HPE Alletra 4100
Compliance: meets EU Commission regulation 2019/424 (EU Lot 9) efficiency requirements
How to use
Install the Flexible Slot Power Supply in the designated power bay of a supported HPE server or storage system following the server’s hardware installation guide. Use the tool-less hot-plug mechanism for quick insertion and removal while the system is running, if supported by the server model and your maintenance procedures. Verify firmware and system compatibility before deployment and maintain spare units to enable rapid replacement and minimize downtime.
Recommendations
Choose 80 Plus Titanium-certified units where maximum efficiency and compliance with EU Lot 9 are required. Keep at least one compatible spare per critical rack to streamline maintenance and reduce replacement time.

## Specifications

| Feature | Value |
|---|---|
| Compatible products | ProLiant DL360 Gen10+ |
| Purpose | Server |
| Efficiency | 96 % |
| 80 PLUS certification | 80 PLUS Titanium |
| AC input voltage | 200 - 240 |
| Total power | 800 W |
| Power supply unit (PSU) form factor | 1U |

## FAQ

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### What is the warranty period?

All HP Enterprise products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized HP Enterprise service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

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