Three-Phase High-Frequency UPS

Three-phase high-frequency online UPS in tower or rack format — full double conversion from 10 to 80kVA for data centers and critical infrastructure.

Three-phase high-frequency online UPS systems protect loads that run on 3-in / 3-out power: data center rows, industrial automation, medical imaging, building services and process control. The topology is full online double conversion (VFI) with DSP control — the load always runs on the inverter, so sags, surges, frequency drift and generator ripple never reach it, and transfer time to battery is zero.

Compared with transformer-based power-frequency systems, high-frequency conversion removes the output transformer: efficiency goes up, the cabinet gets smaller and lighter, and the same kVA fits into a standard IT footprint. HighIdea builds this tier in two formats.

The two platforms

	EX33 tower	33ET rack
Capacity	10 / 20 / 30 / 40 / 60 / 80kVA	10 / 20 / 30 / 40 / 60kVA
Format	Floor-standing tower cabinet	19-inch / 23-inch rack cabinet
Battery	External VRLA racks or LiFePO4 packs	External LiFePO4 packs, runtime per row
Control	Full LCD control panel, DSP, measurements and event log	DSP, measurements, event log, optional SNMP / Modbus / cloud monitoring
Isolation	Optional isolation transformer	Rack-standard, no built-in transformer
Best for	Plant rooms, hospitals, infrastructure with floor space	Standardized data center cabinets and modular IT rooms

EX33 (10-80kVA): tower format with high-frequency online topology, full LCD control panel, optional isolation transformer.
33ET (10-60kVA): rack format for standardized data center cabinets, external battery for flexible runtime.

Both families support parallel operation for N+1 redundancy or capacity expansion, and both accept OEM/ODM customization of capacity, voltage, runtime, communication protocols and branding.

Choosing the right configuration

Start with the load, not the UPS nameplate. Confirm total kVA and kW, the power factor, the input and output phase arrangement, the site's 380 / 400 / 415Vac standard, the required autonomy in minutes, and whether the load includes motors or other high-inrush equipment. Three-phase input / output configuration matters here — see the 3/1 vs 3/3 configuration guide before fixing the single-line diagram.

For a compact, efficient standard IT or plant load, this high-frequency tier is normally the right starting point. For motor-heavy or electrically hostile sites — power plants, substations, steel, mining, chemical plants — the Industrial UPS sub-category covers transformer-isolated power-frequency systems from 6 to 600kVA. The topology decision is explained in line-frequency vs high-frequency UPS, and bypass arrangements are covered in UPS bypass configuration.

For smaller single-phase IT loads, see Online UPS 1-10kVA and Lithium Battery UPS.

Available models2 series

Model	Type	Typical applications	Notes
EX33 Series	Three-phase online UPS (tower)	Data centers, industrial plants, hospitals, infrastructure	3-in / 3-out high-frequency online
33ET10–60 Series	Three-phase online UPS (rack)	Data center racks, server farms, modular IT rooms	3-in / 3-out rack format, external LiFePO4

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.

Three-Phase High-Frequency UPS — frequently asked questions

What capacity range does the three-phase high-frequency UPS cover?

EX33 tower covers 10-80kVA (10 / 20 / 30 / 40 / 60 / 80kVA) and 33ET rack covers 10-60kVA (10 / 20 / 30 / 40 / 60kVA). Both are three-phase input / three-phase output online double-conversion systems at 380 / 400 / 415Vac.

Tower or rack — which one should I choose?

EX33 (10-80kVA) is a tower format with high-frequency online topology, a full LCD control panel and an optional isolation transformer — a good fit for plant rooms, hospitals and infrastructure with floor space. 33ET (10-60kVA) is a rack format for standardized data center cabinets, with an external battery for flexible runtime.

What is the difference between high-frequency and power-frequency three-phase UPS?

High-frequency designs use IGBT conversion without an output transformer, so they are more efficient, lighter and smaller. Power-frequency designs such as the GX series add a transformer-isolated output for galvanic separation, high overload withstand and hostile-grid tolerance. See line-frequency vs high-frequency UPS for the full trade-off.

Can these units run in parallel?

Yes. The three-phase high-frequency range is parallel-ready for N+1 redundancy or capacity growth, with the final configuration confirmed against your load profile.

What battery options are available?

Both platforms use external battery banks. EX33 supports VRLA racks or LiFePO4 packs; 33ET is designed around external LiFePO4 packs so runtime can be sized row by row, with longer cycle life and a smaller footprint than VRLA strings.

Can I get galvanic isolation on a high-frequency unit?

An isolation transformer is available as an option on EX33 for sites with poor grounding or interference. Where isolation and sustained overload capability are the primary requirement, the transformer-based Industrial UPS (GX series, 6-600kVA) is the more robust choice.

Other UPS Power Supply categories

Compare the alternatives within the same product line.

Three-Phase High-Frequency UPS

The two platforms

Choosing the right configuration

Available models2 series

Three-Phase High-Frequency UPS — frequently asked questions

Other UPS Power Supply categories

Lithium Battery UPS

Online UPS

Offline UPS

100V/110V/120V UPS

Industrial UPS