EATON 9PX online double-conversion UPS
The mainstream choice for server rooms: online double-conversion keeps the output fully isolated from the mains, with efficiency and serviceability at practical levels.
Product photo
- Brand
- EATON
- Type
- Online double-conversion
- Typical use
- Server racks, edge rooms
- Models covered
- 9PX1000IRT2U, 9PX1500IRT2U, 9PX2200IRT2U, 9PX2200IRT3U, 9PX3000IRT2U, 9PX3000IRT3U, 9PX5Ki / 9PX6Ki, 9PX8KiPM / 9PX11KiPM, 9PX6KiPM31 / 9PX8KiPM31 / 9PX11KiPM31 (3-phase input)
- Category
- UPS systems / EATON
Why the 9PX is the default for server racks
Most Hong Kong server cabinets we fit end up with a 9PX, for three practical reasons: the output is genuinely isolated from the mains (the load never sees a sag or a surge); the efficiency is high enough that the unit does not become the room's heater; and the battery path is expandable, so runtime can be extended later without changing the unit.
3-phase input variants
The PM31 models (9PX6KiPM31 / 8KiPM31 / 11KiPM31) accept three-phase input while delivering single-phase output — the standard answer for rooms with three-phase incoming but single-phase distribution. Getting this wrong at order time is a costly swap; confirm the supply before ordering.
Runtime planning
The internal batteries cover a few minutes — enough for a controlled shutdown, not for riding out an outage. Extended runtime comes from external battery modules (EBM), sized to the load. Tell us the load and the target minutes and we will size the string.
Key features
- Online double-conversion — output fully isolated from the mains
- High conversion efficiency lowers the running power and cooling bill over the years
- Expandable battery modules extend runtime to the requirement
- LiFePO4 lithium version — smaller and lighter at the same capacity, with far longer cycle life
- High power density — less rack space than comparable units
- Network card and power-management software integrate with virtualisation platforms for clean shutdown
Where it fits
Server racks
Servers, storage and switching in a cabinet — clean isolated output and reliable automatic shutdown.
Edge and branch rooms
Unattended small rooms, kept honest by remote monitoring and alerts rather than site visits.
Tight equipment spaces
Where space and floor loading are limited, the lithium version's size and weight advantage is decisive.
Frequently asked questions
When is online double-conversion actually necessary?
Should I choose the lithium version?
Related models & accessories
EATON 5PX series
The pragmatic choice for small sites: line-interactive with automatic voltage regulation — enough capacity, easy to service, and priced well below three-phase territory.
View detailsEATON 9SX series
When the load draws a surge the moment it starts, the UPS's overload capacity — not its rated VA — decides whether it survives.
View detailsEATON DX / DX RT series
The workhorse of rack machine rooms: online architecture, rack installation, capacity configured after the load is actually measured.
View detailsSpecifications
| Capacity | 1–11 kVA (by model) |
|---|---|
| Architecture | Online double-conversion |
| Output waveform | Pure sine wave, isolated from the mains |
| Output power factor | High PF output, sized for modern server supplies |
| Form factor | Rack or tower |
| Runtime | Depends on load and external battery packs — sized against the actual load |
| Battery options | Sealed VRLA, or LiFePO4 on the lithium variant |
| Communications | USB / serial / dry contacts; optional network card |
Specifications follow the manufacturer's latest data. Actual configuration must be sized against the site load, required runtime and distribution environment — this table is for selection reference only.
Specification sheets follow the latest manufacturer revision. For other technical documents, ask us and we will send them over.