Eaton 9155 12kVA UPS – Single Phase Power

Eaton 12kVA 9155 UPS

Maximum power, minimum footprint

The Eaton 12kVA 9155 UPS provides premium online backup power and scalable battery runtimes for IT and electrical engineering infrastructure in corporate, healthcare, banking and industrial applications. Packing maximum battery runtime into a very small footprint, the 9155 UPS is a complete power protection solution. The 9155 can be equipped with an integrated, customizable power distribution module that includes a maintenance bypass switch.

  • Split-phase, double-conversion online operation offers highest reliability
  • Small footprint saves on valuable floor space
  • Monitor and manage UPS and other devices via a web-based interface
  • Available in 8 kVA, 10 kVA, 12 kVA, and 15 kVA units

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Product description

Eaton 9155 12kVA UPS

High power density means more power protection in a small footprint. The Eaton 9155 12kVA single-phase uninterruptible power supply (UPS) is a proven market winner in its class. With scalable battery runtime options, the 9155 packs maximum battery runtime into a very small footprint. Customize your UPS with power distribution and an integral maintenance bypass switch for complete power protection.

Features of the Eaton 9155 UPS:

  • True double-conversion online operation protects
    connected equipment from all eaton-nine-power-problems
  • Industry leading power density, providing up to 13 percent more power capacity in a compact tower design including batteries
  • Up to 200 percent more standard runtime out of the box, 600 percent more runtime a 3-high module
  • Up to a 74 percent footprint reduction
  • Flexible on-board power distribution modules (PDMs) allow for hardware output or up to 15 different output receptacle options, reducing installation and site preparation expenses
  • Plug-and-play rack Enclosure power distribution with the on-board PDU
  • Inherently scalable from 8–15 kVA, allowing you to pay as you grow or increase capacity with no additional hardware purchases or installation concerns
  • Eaton’s patented Hot Sync paralleling technology allows for wireless paralleling in the event of communications failure, providing the industry’s only truly redundant paralleling technology
  • Flexible 0 footprint extended run configurations allow for adding additional runtime in the same industry-leading compact footprint available
  • Includes on-site 5×8 startup and operator training by Eaton field technician
  • Includes one year of PredictPulse remote monitoring service (requires connectivity parts and self installation)

The following options for the Eaton 9155 12kVA UPS are available:

  • Maintenance Bypass Module (MBM)
    The optional MBM is installed on the UPS rear panel and is used to bypass the
    UPS during maintenance or servicing. The maintenance bypass switch on the
    MBM provides a Make-Before-Break (MBB) wrap-around bypass for UPS service
    without shutting down the load.
  • Power Distribution Module (PDM)
    The optional PDM provides the same functionality as the MBM and also comes
    equipped with several different types of output receptacles.
  • Wall-Mounted Bypass Switch
    The optional wall-mounted bypass switch is used to bypass the UPS during
    maintenance or servicing, providing wrap-around bypass for UPS service without
    shutting down the load.
  • Parallel Tie Cabinet
    An optional parallel system with up to three UPSs can be installed to provide a
    parallel capacity and/or redundant system. This load sharing system provides more
    capacity than a single UPS and can provide backup, depending on the load and
    configuration. In addition, when one UPS is taken out of service for maintenance or
    is not operating properly, a redundant UPS continues to supply uninterrupted
    power to the critical load. A parallel Powerware Hot Sync Controller Area Network
    (CAN) Bridge Card provides connectivity for system metering and operational mode
    control. The parallel system consists of two to three UPSs, each with a parallel
    CAN Bridge Card, and a parallel tie cabinet.
  • Input Isolation Transformer
    The optional input isolation transformer is located at the bottom of a 3-high UPS
    model. The input isolation transformer provides a neutral from a 208V or 240V
    input source with 240V output and can be wired to the UPS or to an MBM/PDM.
  • Seismic Kit
    The optional seismic kit secures the UPS and optional EBMs for Zone 4 seismic
Double Conversion Online UPS

Double Conversion Technology

Double Conversion Topology

The Eaton 9155 uninterruptible power supply uses the Double Conversion Online UPS topology.  This  provides the ultimate in clean and stable electrical power for critical applications.  Incoming AC power is fed to the UPS’ rectifier converting it from AC to DC power. The converted DC power routes to a battery charging circuit and to the inverter for conversion back to AC power. The resulting “double converted” electrical power is pure sine wave output providing near perfect electrical power for connected equipment.

To ensure 7/24 up time the double conversion UPS topology utilizes a static “bypass switch” within its circuity design. If the 9155 UPS detects a system failure, audible alarms will sound as the bypass switch is engages. This routes power around the failed UPS and ensures critical load power to target equipment.  This very important feature allows for 100% up time for critical equipment during repair.

In the event of total power failure, the UPS will power off the rectifier when the loss of power is detected. The UPS’ internal backup batteries will continue to supply DC power to the inverter. There is no transfer time as the transition to battery power is instantaneous. This feature provides true uninterruptible power to mission critical equipment.

Technical Specifications


9155 12 kVA 32 Battery (2-high) K41211000000000
9155 12 kVA 32 Battery w/Trans. Mod. (3-high) K41213000000000
9155 12 kVA 64 Battery (3-high) K41212000000000
Eaton 9155 12kVA UPS

Rated Power Capacity (Apparent/Active)

12kVA / 10.8kW

Voltage/frequency range

200V–240V with neutral or with optional input transformer
50/60 Hz (45 to 65 Hz)

Efficiency (Maximum%)

90% typical

Overload Capacity

>150% for 300 milliseconds
101–110% for 10 minutes
111–125% for 60 seconds
126–149% for 5 seconds

Max charging (adjustable)

Service configurable 0.5 34A per string, with overall maximum of 34A (limited by input current). Default: 3.4A per string

Battery Module

9 Ah sealed, valve-regulated lead acid (VRLA), maintenance-free, minimum 3-year float service life at 25°C (77°F), voltage 192 Vdc (96 cells per string)

Dimensions & Weight

2-High UPS 32.2" x 12" x 33.5" (81 x 30 x 85 cm) 352 lb (160 kg)
3-High UPS-32 47.8" x 12" x 33.5" (121.5 x 30 x 85 cm) 550 lb (250 kg)
3-High UPS-64 47.8" x 12" x 33.5" (121.5 x 30 x 85 cm) 590 lb (268 kg)

Output Connections

Terminal block (Hardwired)

Operating Temperature

50°F to 104°F (10°C to 40°C) Optimal battery performance: 77°F (25°C)

Operating Elevation

9,843 ft (3,000m) operating without derating 32,810 ft (10,000m) during transportation

Acoustic Noise

<56 dBA at 1 meter distance, typical loads <62 dBA for heavy load, high ambient or high altitude, on battery


EMC compliance: 47 CFR Part 15/ICES-003 Class A
Markings: cULus, NOM-NYCE
Quality ISO 9001:2015, ISO 14001:2004
Safety certifications: UL1778 5th Edition, CSA C22.2 No. 107.3-14, NOM-NYCE
Surge: ANSI C62.41 Category B3, IEC 61000-4-5


(1) relay contact, (1) REPO, (2) environmental input
(2) X-Slot communication bays


2-years parts, (90) days onsite labor form startup

Available Options

External maintenance bypass, output distribution, external battery packs, parallel cables

Estimated Run-Time

Battery Run Time Chart: