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HPE J9805A 640 external power supply shelf with three modular slots

HPE

HPE J9805A 640 redundant external power supply shelf

SKU CH-04CH-7QNNA MPN J9805A

Provides redundant external power for HP 2920 switches with three modular supply slots supporting up to eight units and 1440W PoE+ across 48 ports

  • Redundant power for up to eight 2920 switches protects against internal supply failures
  • Three modular slots let one supply fail without affecting the other two
  • External shelf delivers 1440 W so 48 PoE+ ports can all run at 30 W
  • Full management through connected 2920 switches simplifies configuration
  • Ships ready for optional power supplies and cables purchased separately

Power shelf for HP 2920 switches

The HP J9805A is a 640 redundant external power supply shelf designed for the HP 2920 Switch Series. It provides backup power for internal supplies and delivers external power for high-demand PoE+ deployments. Network administrators use it to protect uptime across multiple switches.

Three modular bays for hot-swap supplies

The unit ships empty with three power supply module slots that accept optional supplies and cables purchased separately. Up to eight HP 2920 Switches can connect for redundant power, while up to three 48-port PoE+ switches draw external power simultaneously. A failed supply in one bay does not affect the other two.

Sustained PoE+ delivery across full port counts

Under continuous load the shelf enables three 48-port PoE+ switches to supply 1440 W total, letting every port deliver 30 W at the same time. Redundant architecture keeps switches running during a supply failure without interruption. Management is handled through the connected 2920 switches.

Highlights

  • Redundant power for up to eight 2920 switches protects against internal supply failures
  • Three modular slots let one supply fail without affecting the other two
  • External shelf delivers 1440 W so 48 PoE+ ports can all run at 30 W
  • Full management through connected 2920 switches simplifies configuration
  • Ships ready for optional power supplies and cables purchased separately

Specifications

BrandHewlett-Packard
Shipping weight6.28 kg
Package size572 × 472 × 130 mm

Questions about this item

How many modular power supply slots does the 640 shelf provide?

The shelf has three modular power supply slots, allowing one supply to fail without affecting the other two.

What is the total PoE+ power budget the shelf can deliver to connected 2920 switches?

Up to 1440W of PoE+ power can be supplied, enabling three 48-port PoE+ switches to run all ports at 30W simultaneously.

Which switch series must already be installed for this shelf to function?

The shelf is designed to work with the HP 2920 Switch Series and connects to those switches for management and power distribution.

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