Online UPS
True online double-conversion topology with zero transfer time — for loads that cannot tolerate even a millisecond of interruption.
What online double conversion means
An online UPS continuously rebuilds the AC output from DC: the load always runs on the inverter, never on raw mains. Input disturbances — sags, surges, frequency drift, generator ripple — never reach the load, and transfer time between mains, battery and bypass is zero.
Choosing a model
- C series (1–10kVA): high-frequency online UPS with LCD display and DSP control; tower and rack versions, optional external batteries for extended runtime.
- H6-10K (220): professional edition with external isolation transformer for sites with poor grounding or heavy interference.
For lithium-battery versions, see Lithium Battery UPS; for 100–127V markets, see 100V/110V/120V UPS.
Available models2 series
| Model | Type | Typical applications | Notes |
|---|---|---|---|
 C Series (II)
|
Online double-conversion UPS (tower / rack) | Servers, workstations, industrial control, network equipment | Tower and rack versions; external battery for runtime scaling |
 H6-10K(220)
|
Online UPS with external isolation transformer | Medical systems, precision instruments, sites with interference or grounding issues | Professional edition; isolation transformer in external cabinet |
Models with links have detailed specification pages; unlisted models are also available on request. Capacity and quantity should be sized by our engineers against the actual load — never by nameplate rating alone.
Online UPS — frequently asked questions
What models are in the online UPS range?
What is the transfer time?
When should I choose this range instead of the lithium battery UPS?
Other UPS Power Supply categories
Compare the alternatives within the same product line.
Lithium Battery UPS
Online UPS with built-in or external LiFePO4 — 1 to 10kVA, tower and rack, 30+ minutes full-load backup.
View detailsOffline UPS
Line-interactive and offline UPS from 500VA to 2000VA — cost-effective backup for PCs, POS and home office.
View details100V/110V/120V UPS
Online and offline UPS with 100–127V output for Japan, the Americas and imported equipment.
View detailsThree-Phase High-Frequency UPS
Three-phase-in / three-phase-out high-frequency online UPS, 10-80kVA in tower and rack formats for data centers, hospitals and plant infrastructure.
View detailsIndustrial UPS
Transformer-isolated power-frequency (industrial-frequency) UPS, 6-600kVA, with high overload capacity for power plants, substations, steel, mining and chemical plants.
View detailsSpecial-Purpose UPS
A sub-category of UPS Power Supply for systems purpose-built for one specific operating scenario rather than a general load. Each scenario gets its own specially engineered series; EPS-D rolling door / shutter motor UPS is the first.
View details