A 3,750 kVA transformer sits in the range used for substantial industrial loads, data-center distribution and some generation step-up applications. At this size, the enclosure alone tells us little. We pay attention to the actual voltage ratio, rated cooling stages, winding connections and how the transformer interfaces with the rest of the installation.
We buy 3.75 MVA three-phase transformers from sellers throughout Virginia, including surplus projects and decommissioned installations. A complete transformer, a transformer section within a larger assembly and a failed unit require different information. Our transformer size directory covers other ratings if your nameplate lists several capacity values.
01What the 3,750 kVA rating actually means
A 3,750 kVA rating equals 3.75 MVA of apparent power. For a three-phase transformer, that number describes the total three-phase capacity, not the capacity of each phase. It is not automatically 3,750 kW: real power depends on the connected load's power factor.
The rating applies under the conditions specified on the nameplate, including cooling and temperature rise. Some transformers show one capacity; others show separate natural-cooled and forced-air ratings. A plate reading 3,000/3,750 kVA may identify 3,000 kVA at ONAN and 3,750 kVA at ONAF. Read the capacity and cooling entries together rather than choosing the largest number.
The amp table on this page shows current at common voltages. For one worked example, three-phase full-load current at 480 V is I = (3,750 × 1,000) ÷ (√3 × 480), or approximately 4,511 A. That is a calculated rated current, not a recommendation for breaker, conductor or bus sizing. See the kVA and full-load amps guide for the relationship between capacity and voltage.
02Substation, pad-mount and unit-substation forms
We buy 3,750 kVA substation transformers with configurations suited to industrial power distribution. Bushings, cable boxes, throat connections and cooling equipment matter because they determine how a buyer can integrate the unit. Overall photos should show both connection sides, not just the front of the tank.
We also buy three-phase pad-mount transformers at this rating. Compartment layout, live-front or dead-front construction, radial or loop-feed arrangement, and installed switching or fusing help identify the equipment. Photograph the compartment labels and accessible connection details only when it is safe to do so.
For unit-substation equipment, identify what is included with the transformer. A transformer section offered alone is different from an assembly that includes primary switching and secondary switchgear. Tell us whether adjoining sections remain available and whether the transformer uses a close-coupled throat or separate cable connections.
Full-load amps for a 3,750 kVA three-phase transformer
The amp table on this page uses the standard formula Amps = kVA × 1,000 ÷ (1.732 × line-to-line volts). Match the voltage on your nameplate to read the rated full-load current of each winding.
| Winding voltage | Full-load amps |
|---|---|
| 208 V | 10,409 |
| 240 V | 9,021 |
| 480 V | 4,511 |
| 600 V | 3,608 |
| 2,400 V | 902 |
| 4,160 V | 520 |
| 12,470 V | 174 |
| 13,200 V | 164 |
| 13,800 V | 157 |
| 23,000 V | 94.1 |
| 34,500 V | 62.8 |
03Voltage combinations and the applications they serve
Distribution units at this capacity may step medium voltage down to 480Y/277 V for industrial or data-center loads. Primary ratings can include 12,470 V, 13,200 V, 13,800 V or 34,500 V, depending on the system. A designation such as 12470GrdY/7200 communicates more than a rounded description of “12 kV”; send the full marking exactly as written.
A 3,750 kVA transformer can also serve medium-voltage industrial distribution or generation step-up service. Generation equipment may use a low-voltage winding matched to generator or inverter output and a medium-voltage winding matched to the collection system. Do not assume that every 3.75 MVA unit has a 480 V secondary.
We pay attention to frequency, winding connections, taps, impedance and BIL along with voltage. These details affect suitability for another installation. A familiar kVA rating does not make two transformers interchangeable, especially when one serves grounded-wye distribution and another was specified for a particular generation connection.
04Confirm the capacity from the complete nameplate
If you want to sell 3,750 kVA transformer equipment, start with a sharp photo of the entire nameplate. Capture the manufacturer, serial number, three-phase designation, kVA or MVA ratings, primary and secondary voltages, frequency and cooling class. A cropped photo of “3750” can omit the information that explains when that rating applies.
On liquid-filled equipment, include the fluid type, fluid quantity, temperature-rise ratings and any separate fluid or PCB labels. Mineral oil and FR3 natural ester are different insulating fluids; do not identify the fluid from its appearance. PCB status must be disclosed and documented, including records available for older equipment.
Also photograph auxiliary plates, tap-position markings and any listed IEEE C57 standards. If the plate lists multiple ratings, send them all. A 3,000 kVA transformer with a 3,750 kVA forced-air stage should be described with both ratings and the condition of its fans and controls.
05Physical size, weight and removal access
There is no single footprint or shipping weight for a 3,750 kVA transformer. Liquid-filled and dry-type designs differ, and voltage class, impedance, cooling arrangement and enclosure construction affect dimensions. Use nameplate weights and measured dimensions rather than estimates based on capacity alone.
Tell us whether dimensions include radiators, fans, cable boxes and projecting bushings. Distinguish total operating weight from any separately listed shipping, core-and-coil or fluid weight. Photos of lifting points, the base and the surrounding space help explain what loading will involve.
Access can be as important as the tank dimensions. Note indoor doors, overhead restrictions, fenced yards, narrow approaches and whether the unit remains attached to adjoining gear. Sellers arrange qualified electricians to de-energize and disconnect equipment; we do not perform electrical disconnect work or ask sellers to drain fluid.
06What drives buyer fit and a written offer
Demand for a particular 3,750 kVA transformer depends on the combination of capacity, voltage and construction, not size alone. A distribution unit with a usable connection arrangement serves a different need from a project-specific step-up transformer. Condition, completeness and available records also influence whether the equipment fits a purchase.
We buy all brands, used equipment and new-surplus units. Include available test reports, storage history and the reason for retirement. For failed or damaged transformers, describe the event and visible damage; those units are reviewed case by case. Missing accessories or uncertain operating history should be stated directly.
Send the photos, location, quantity and condition notes through the offer request form. We review the information and may ask about PCB documentation, tests or access; if the equipment fits, our written offer states price, freight, loading and payment terms, and pickup is scheduled with you. See how the purchase process works for details.
Frequently asked questions
Is a 3.75 MVA transformer the same size as 3,750 kVA?
Yes, 3.75 MVA equals 3,750 kVA. Both describe apparent-power capacity, but the nameplate may assign that capacity to a specific cooling stage. Send the complete rating rather than only the MVA number, especially if the plate also lists a lower natural-cooled capacity or additional forced-air ratings.
Can I sell a 3,000/3,750 kVA transformer with missing fans?
Yes, we buy transformers with multiple cooling ratings, but missing fans must be disclosed. If 3,750 kVA is the forced-air rating, do not describe the unit as ready to carry that load without its specified cooling equipment. Send photos of the remaining fans, controls and nameplate so we can identify what is missing.
Do you buy 3,750 kVA generation step-up transformers?
Yes, we buy generation step-up transformers at 3,750 kVA, including solar and wind units. Send both winding voltages, winding connections, impedance, frequency and tap information. Identify whether the transformer was used with a generator or inverter system, and disclose any failure history. Failed units are reviewed case by case.
Does a 3,750 kVA transformer have to be oil-filled to sell?
No, we buy dry-type and cast-resin transformers as well as liquid-filled units at this capacity. For dry-type equipment, photograph the enclosure, winding assembly when safely accessible, cooling information and nameplate. Note moisture exposure, visible cracking, contamination or missing panels, and include available maintenance or test records.
Can I sell only the transformer from a 3,750 kVA unit substation?
Yes, you can offer the transformer section separately from the adjoining switchgear. Tell us exactly which sections and connection components are included, and photograph the interfaces. Any separation requiring electrical work must be handled by your qualified electricians. Do not assume that attached gear is included unless it is part of your sale.