Sourcing three-phase power protection across borders means judging the company as carefully as the hardware. This guide gives procurement teams, importers and tender teams a twelve-question framework for checking an online ups manufacturer before an order is placed, and a practical way to compare an industrial ups supplier against the evidence that actually decides a project: build capability, customization limits, routine-test records, capacity steps, lead time, spares and OEM terms.
This page is organised as a checklist, not a brochure. Read the twelve questions first, then jump to the section that answers each one — the whole due-diligence sequence in about ten seconds.
All three can send you a datasheet. Only one can show you the evidence behind it. Work down the rows and mark which column your candidate actually fills.
| Evidence type | Manufacturer | Trading company | Assembler |
|---|---|---|---|
| Production floor | Winding, assembly and test areas that can be shown on a live video call | Office, showroom or warehouse only | Final assembly bay using bought-in modules |
| Capacity steps built in-house | Explains a continuous range such as 10KVA through 400KVA, up to 500KVA | Quotes whatever the upstream factory lists | Limited to the few ratings it assembles |
| Technical answers | Names the topology: DSP digital control, 16-bit digital chip and ASIC DDC control technology, IGBT and SCR devices | Forwards your question and returns a forwarded reply | Answers on components, hesitates on system architecture |
| Isolation design | Explains the industrial frequency isolation transformer and the complete electrical isolation between input and output | Repeats a brochure sentence | Depends on the module supplier's design |
| Customization requests | Confirms what can be adapted per project and what cannot | Accepts the request, then negotiates with the factory | Limited to rebadging or minor options |
| Redundancy architecture | Discusses single unit, 1+1 parallel and N+1 multi-unit parallel redundant operation | Repeats the phrase without configuration detail | Rarely offers true N+1 |
| Documents and spares | Can link serial numbers to routine tests and quote recommended spares | Points to the factory for anything after payment | Mixed, depends on module sources |
Ask a single technical question that a sales script cannot answer: "When the load is badly unbalanced across the three phases, how does your design keep the output stable?" A manufacturer will talk about 100% unbalanced load capability and full three-phase independent modulation. Then ask "what happens to the output during a power-mode switch?" and listen for the dual static switch and zero transfer time. Vague, delayed or forwarded answers tell you who you are really dealing with.
A test report that does not carry a serial number is marketing. Use the left column as your request list and the right column as the standard you accept.
| Ask the supplier for… | What a credible answer looks like |
|---|---|
| Routine test report | A per-unit record identified by the same serial number that appears on the cabinet nameplate and the packing list. |
| Burn-in record | Burn-in date, duration and conditions, tied to the unit being shipped rather than to a generic model sheet. |
| Severe load-imbalance test | Results showing operation under unbalanced loading, consistent with the stated 100% unbalanced load capability and full three-phase independent modulation. |
| Protection-function test | Evidence of the comprehensive protection against overloads and short circuits, with the trip behaviour described. |
| Transfer-time verification | Confirmation of zero transfer time through the dual static switch during power mode switching. |
| Topology documentation | A written statement of the industrial frequency isolation transformer design, IGBT and SCR devices, and the DSP control platform. |
| Spare-parts list | Recommended spares with part identification and availability, aligned with the modular design of the cabinet. |
Test evidence is the one deliverable that survives the project. Buyers who receive serial-linked test records can hand them to a consultant, a bank or an insurer without further explanation — and they can compare a second bid on equal terms instead of comparing glossy catalogues.
Applied to the flagship three-phase model: a double conversion on-line UPS with DSP digital control, an industrial frequency isolation transformer, a dual static switch and N+1 parallel redundancy, from 10KVA to 400KVA with options up to 500KVA.
Three Phase Industrial Frequency On-line UPS 10–400KVA — DSP Digital Control, Isolation Transformer, Dual Static Switch, N+1 Parallel, ECO Mode
| Operation mode | Three phase input, three phase output, double conversion on-line |
|---|---|
| Power range | 10KVA – 400KVA (up to 500KVA) |
| Control technology | DSP digital control with high-speed 16-bit digital chip and ASIC DDC control technology |
| Power devices | Advanced IGBT and SCR power devices |
| Isolation | Industrial frequency isolation transformer providing complete electrical isolation between output and input |
| Load capability | 100% unbalanced load, full three-phase independent modulation |
| Transfer time | Zero transfer time via dual static switch |
| Efficiency | Up to 98% in ECO economic mode |
| Parallel capability | Single unit, 1+1 parallel, N+1 multi-unit parallel redundant |
| Protection | Comprehensive protection against abnormalities such as overloads and short circuits |
| Diagnostics | Real-time system diagnostics |
| Customization | Listed as customizable, with project-level voltage and frequency adaptation |
The published applications of this series range from data centers and network computer rooms to finance, telecom, transportation, medical, energy and manufacturing. Use the table to turn a site description into the questions that decide the configuration — the final rating must always come from your own load study.
| Site scenario | What the load demands | Confirm before ordering | Discussion starting point |
|---|---|---|---|
| Data center & network computer room | Continuous double conversion and no single point of failure | N+1 parallel arrangement, ECO mode policy, growth headroom | Mid to high capacity steps with parallel redundancy |
| Finance, insurance & taxation | Clean, uninterrupted power for transaction systems | Isolation design, zero transfer time, real-time diagnostics | Mid range steps, single or 1+1 parallel |
| Telecommunications | Dependable supply for communication equipment across sites | Isolation transformer design and remote diagnostics capability | Mid range steps, standardise on one model family |
| Manufacturing & automation lines | Tolerance of mixed single-phase and three-phase machinery | 100% unbalanced load capability and short-circuit protection | Mid to high capacity steps with phase imbalance review |
| Medical devices & precision instruments | Stable voltage and low disturbance transfer | Extremely low zero-ground voltage and complete input/output isolation | Mid range steps with isolation confirmation |
| Energy extraction, military & government sites | Large electromechanical loads in harsh environments | High capacity build, modular maintenance access, spares plan | High capacity steps, up to 500KVA on request |
Every scenario resolves into the same three commercial choices: how much redundancy you buy now, whether ECO mode is permitted on any part of the load, and how much capacity headroom you reserve for growth. Settle those three and the model number largely selects itself.
Send the load details once and receive a configuration proposal, test and documentation package, and a clear statement of what is standard, what is customizable, and what a bulk or OEM order changes.
Capacity in kVA and kW, phase arrangement, load type, expected imbalance, redundancy target, destination and required quantity.
Configuration proposal covering capacity step between 10KVA and 400KVA, parallel arrangement, ECO policy and any project-specific voltage or frequency adaptation.
Routine test records, burn-in details, protection-function verification, transfer-time confirmation and topology documentation for your review.
Lead time, recommended spare parts, warranty terms and OEM/ODM or customization scope agreed in writing before production.
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View productask for a live view of the winding, assembly and test areas rather than an office tour, then ask one technical question a sales script cannot answer — for example how the design behaves under severe load imbalance. a manufacturer can describe dsp digital control, an industrial frequency isolation transformer and a dual static switch in its own words.
the product page lists the series as customizable and describes project-level voltage and frequency range adaptation, capacity selection from 10kva to 400kva with options up to 500kva, and a choice between single unit, 1+1 parallel and n+1 multi-unit parallel redundant operation. confirm the exact scope of any bespoke requirement in writing before production.
the listed capacity steps are 10kva, 15kva, 20kva, 30kva, 40kva, 60kva, 80kva, 100kva, 120kva, 150kva, 200kva, 300kva and 400kva, alongside a customizable option. all operate as three phase input, three phase output double conversion on-line systems.
it refers to the dual static switch system, which switches power modes with zero transfer time so the connected load does not see an interruption during the changeover. it is one of the specification points worth having confirmed in the test documentation package.
the series supports eco economic mode with efficiency up to 98%, alongside standard double conversion operation. whether any part of your load may run in eco mode depends on how sensitive that equipment is, so have the decision reviewed against your installation rather than applied to the whole site by default.
provide capacity in kva and kw, the phase arrangement, a description of the load and expected imbalance, your redundancy target, the destination country, the required quantity and any oem or customization requirement. requests for quotes, oem orders and spare-parts enquiries can be sent to amber@feixiangdapower.com or (+86) 18938233547.
