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Tall 21U rack tower UPS in dark metal finish, hardwired terminals visible, 586 lb unit

Eaton

Eaton 9PXM12S16K UPS 16 kVA scalable 20 kVA N+1 208-240V Hardwired 21U

SKU CH-K32T-E4RS9 MPN 9PXM12S16K

Scalable 16 kVA battery backup grows to 20 kVA N+1 redundancy with hardwired 208-240 V input and output in a 21U rack form

  • AC input voltage208 V AC - 240 V AC
  • Power outletsHardwired
  • Scalable 16 kVA to 20 kVA N+1 redundancy for growing power needs
  • Hardwired 208-240 V input and output for direct facility wiring
  • 21U rack/tower form factor fits standard server cabinets
  • TAA and FCC compliant for regulated deployments
  • 586 lb robust chassis rated for data-centre reliability

Scalable 16 kVA to 20 kVA N+1 UPS

The Eaton 9PXM12S16K is a high-capacity uninterruptible power supply designed for data-centre and critical-infrastructure environments. It delivers 16 kVA of continuous power and can scale to 20 kVA in an N+1 redundant configuration. The unit operates on a 208-240 V AC hardwired input and provides hardwired output for permanent installation. Its 21U rack/tower form factor suits dense server-room deployments.

21U rack/tower chassis with hardwired connections

The enclosure measures 17.5 inches wide, 34.5 inches deep and 36.5 inches high, weighing 586 lb for a substantial industrial presence. Hardwired input and output terminals eliminate plug-and-cord connections, ensuring secure, code-compliant power distribution. The rack/tower orientation allows flexible mounting in standard cabinets or standalone floor placement. TAA and FCC compliance confirm suitability for government and regulated-sector procurement.

High-density double-conversion architecture

Double-conversion topology isolates connected loads from utility disturbances while maintaining tight voltage and frequency regulation. Scalable power modules share the load evenly, so a single module failure leaves the remaining units to support the full 16 kVA without interruption. The 21U height optimises rack-space efficiency for multi-module strings. Hardwired construction reduces connection resistance, lowering waste heat under continuous full-load operation.

How it compares

Measured against everything we stock in Uninterruptible Power Supplies (UPS), at today’s prices. Recalculated every night.

Price $24,433.99
Pricier than about 95% of the 1,153 comparable items (median $948.99).

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Specifications

Product
Brand nameEATON
Model name9PXM12S16K
Power
AC input voltage208 V AC - 240 V AC
Power outletsHardwired
Size & build
Shipping weight265.81 kg
Package size927 × 927 × 445 mm

Questions about this item

What does the 208-240 V hardwired input cap in practice?

The hardwired 208-240 V AC input accepts single-phase or three-phase utility power within that range and feeds the internal rectifier; voltage outside the window triggers battery operation or shutdown.

What clearance and floor capacity does the 21U, 586 lb frame need?

The chassis measures 34.5 in deep, 17.5 in wide and 36.5 in high; allow front and rear service space and verify the floor can support 586 lb plus battery modules.

How is the unit commissioned and which step is most often missed?

After positioning and hardwiring AC input and output, install the battery modules, close the breaker, then run the startup wizard on the front LCD; skipping the battery-detection step prevents N+1 redundancy from activating.

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