865398-001 is the HPE model number for 500W Flex Slot Platinum Hot Plug Low Halogen Power Supply Kit. If you are matching a number printed on a power supply label or returned by system inventory, this is the identifier HPE assigns to the physical unit rather than to a sales package or service replacement. The unit is a hot-plug, redundant plug-in module built to the Flex Slot specification, rated at 500 watts with 94% efficiency and 80 PLUS Platinum certification. Input is AC 100-240 volt at 50-60 hertz through an IEC 60320 C14 connector. It is used in DL360 Gen10, DL380 Gen10, and ML350 Gen10 servers.
HPE Option Part #: 865408-B21
HPE Spare Part #: 866729-001
HPE Model #: 865398-001
HPE Assembly Part #: 865399-101
PRODUCT SPECIFICATIONS FOR 865398-001:
- Product Type: Power supply - hot-plug / redundant
- Form Factor: Plug-in module
- Specification Compliance: Flex Slot
- Power Supply Compatibility: PC/Server
- Power Provided: 500 watt
- Power Capacity (VA): 563 volt ampere per kilogram
- Voltage Required: AC 100-240 volt
- Frequency Required: 50 - 60 hertz
- Input Connector Type: Power IEC 60320 C14
- Efficiency: 94%
- 80 PLUS Certification: 80 PLUS Platinum
- Compliant Standards: BSMI, CCC, CISPR Class A, C-Tick, cUL, KCC, Low halogen, TUV, UL, WEEE
- Width: 2.7 inch
- Depth: 8.9 inch
- Height: 1.6 inch
- Weight: 32.1 ounce
- Min Operating Temperature: 41 degree Fahrenheit
- Max Operating Temperature: 131 degree Fahrenheit
- Humidity Range Operating: 5 - 95% (non-condensing
COMPATIBLE WITH:
PROLIANT DL SERIES
PROLIANT ML SERIES
** This list may not be complete. Contact us via Live Chat if you have any questions about compatibility.
FREQUENTLY ASKED QUESTIONS ABOUT 865398-001
What is the difference between 865398-001, 865408-B21 and 866729-001?
All three identify the same physical 500W Flex Slot Platinum power supply. This page, 865398-001, is the model number — the identifier tied to the unit itself. 865408-B21 is the option part number, used when the supply is ordered as a standalone orderable kit. 866729-001 is the spare part number, used for service replacement. This family also includes an assembly revision and an alternate part number, both listed in the cross-reference block on this page. An assembly part number identifies a specific build revision of the same unit.
Which servers does 865398-001 fit?
This power supply is supported in the HPE ProLiant DL360 Gen10, DL380 Gen10, and ML350 Gen10. It conforms to the Flex Slot specification, so it installs into the Flex Slot power supply bays on those platforms as a hot-plug, redundant plug-in module. Before ordering, confirm the target server's existing supplies are also Flex Slot units of matching wattage, since mixing output ratings in a redundant pair is not supported.
What are the electrical specifications of 865398-001?
The unit provides 500 watts of output with a power capacity figure of 563 volt ampere per kilogram. Input is AC 100-240 volt at 50 to 60 hertz through a Power IEC 60320 C14 inlet. Efficiency is rated at 94%, and the supply carries 80 PLUS Platinum certification. It is a hot-plug, redundant design intended for PC/server power supply applications.
What are the physical and environmental limits for this unit?
The module measures 2.7 inches wide, 8.9 inches deep, and 1.6 inches high, and weighs 32.1 ounces. Operating temperature range is 41 to 131 degrees Fahrenheit, with operating humidity of 5 to 95% non-condensing. It is a low halogen part and meets BSMI, CCC, CISPR Class A, C-Tick, cUL, KCC, TUV, UL, and WEEE compliance standards.
Last Updated: 2026-09-01
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This product is warrantied against hardware failure for a period of 1 Year from the date of purchase. Before making a purchase, please take a moment to review our return policy below.
Returns
It is the customer's responsibility to verify compatibility with their machine(s) before placing an order. If an item is ordered by mistake, it can be returned for refund, minus a 25% restocking fee, within 5 business days of receipt. The cost of freight is not refundable.
Please be aware that factory-sealed equipment can only be returned if it remains unopened.
Defective Products
If you have received a defective part and your machine is still within the HPE warranty period, please initiate a warranty exchange by visiting the HPE Enterprise Support Center. Be sure to have the serial numbers of the defective drive and your server/storage array handy.
In case your hardware becomes defective during the Global One warranty period, but the HPE warranty has expired, you can return the product to us for a working replacement. You are responsible for the shipment of returned merchandise. However, we will cover the expense of Ground /Economy shipment for the replacement item(s).
Requesting an RMA
To initiate a return or warranty claim, please complete and submit the RMA Request Form.
