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HP 399771-B21 hot-plug redundant power supply unit, rectangular metal housing with handle and grille

HP

HP 399771-B21 800W/850W/1000W Hot-Plug Redundant Power Supply

SKU CH-4Z6W-5VHDZ

Hot-plug redundant power supply delivering 800 W at 100 VAC, 850 W at 120 VAC or 1000 W at 200-240 VAC for ProLiant servers

  • Hot-plug redundancy keeps servers running during replacement
  • Delivers 800 W at 100 VAC for low-voltage sites
  • Provides 850 W at 120 VAC for standard mains
  • Supplies 1000 W at 200-240 VAC for high-voltage efficiency
  • Tool-free installation with included mounting hardware

HP 399771-B21 Redundant Power Supply

This HP 399771-B21 is a hot-plug redundant power supply designed for ProLiant server environments. It delivers 800W at 100 VAC, 850W at 120 VAC and 1000W at 200-240 VAC. The unit installs without wiring and includes all necessary mounting hardware for immediate deployment.

Replaces failed or capacity-limited PSUs

The supply replaces a failed unit or upgrades a non-redundant configuration in compatible ProLiant servers. Redundancy becomes valuable when uptime requirements exceed the risk tolerance of a single power source. Installation requires no wiring changes, minimising service downtime during the swap.

Limited to supported ProLiant chassis

Practical limits are defined by the server chassis and backplane that accept this specific hot-plug form factor. The supply operates only within the stated input voltage ranges of 100, 120 and 200-240 VAC. Buyers needing different wattage steps, alternative input ranges or non-hot-plug form factors must select a different part.

How it compares

Measured against everything we stock in ATX Desktop Power Supplies, at today’s prices. Recalculated every night.

Price $39.99
Cheaper than about 93% of the 10,869 comparable items (median $142.99).

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Specifications

No published specifications for this item yet.

Questions about this item

What server chassis is the HP 399771-B21 power supply designed to fit?

It is built for HP ProLiant servers and uses the standard hot-plug form factor that slides directly into the server's redundant power-supply bay.

What is the installation step that installers most often miss with this hot-plug unit?

The supply must be pushed firmly until the latch clicks; a partial insert leaves the unit unpowered even though it looks seated.

Which replaceable part inside the 399771-B21 will need attention after extended use?

The internal cooling fan is the only moving component and should be inspected periodically for dust build-up or bearing noise.

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