HPE 800W Flex Slot -48VDC Hot Plug Low Halogen Power Supply Kit

The HPE 865434-B21 is an 800 watt Flex Slot power supply built for ProLiant and Apollo servers that operate on a -48 V DC feed. With conversion efficiency that reaches up to 94 percent, it helps lower electricity costs and reduces the amount of heat each rack must dissipate.

Because it follows the HPE Flex Slot standard, the unit occupies minimal space inside Gen10, Gen10 Plus, and Gen11 systems, leaving valuable room for additional drives, memory, or network adapters. Administrators who need nonstop service benefit from hot plug capability, which makes it possible to swap the supply without taking the server offline.

This kit fits naturally in data centers that rely on -48 V DC power, such as telecom facilities, cloud hosting environments, and edge locations where energy efficiency and rapid serviceability matter. It also suits research labs and high performance clusters that cannot afford unexpected downtime.

At 6.80 x 4.04 x 22.53 centimeters, the design is compact and easy to handle during maintenance. A low halogen build supports environmental policies aimed at reducing hazardous materials, while an operating range from 41 to 131 degrees Fahrenheit and up to 95 percent humidity ensures dependable performance in demanding conditions.

For IT teams seeking reliable power, simple installation, and the flexibility to maintain hardware without interrupting workloads, this HPE Flex Slot supply delivers a practical, cost-saving solution.

• 800 watt DC output
• Input voltage of -48 V DC
• Up to 94 percent energy conversion efficiency
• Flex Slot form factor for straightforward installation
• Hot plug support for live replacement
• Compatible with HPE ProLiant and Apollo Gen10, Gen10 Plus, and Gen11 servers
• Compact size of 6.80 x 4.04 x 22.53 cm
• Low halogen construction that helps reduce environmental impact
• Operates from 41 to 131 degrees Fahrenheit
• Supports up to 95 percent relative humidity