01What a 3333 kVA Transformer Rating Means
A 3333 kVA transformer has a rated apparent-power capacity of 3.333 MVA. The catalog rating for this size is single-phase, and its common type is a substation power transformer used as one component in a power bank. A component’s role in a bank matters: the complete bank arrangement and connections determine how it serves the system.
The 3333 kVA value appears as a preferred single-phase continuous rating in IEEE C57.12.00-2015, Table 2, as cited here. That does not rule out custom ratings or later standards. A 3000 kVA unit is also a common commercial size, but it is not the same nameplate rating. Compare a possible match with the separate pages for 3000 kVA transformers, 2500 kVA transformers and 5000 kVA transformers.
FLAFull-Load Amps for a 3333 kVA Transformer
Rated full-load current at common California voltages. Single-phase: amps = kVA × 1000 ÷ volts. Three-phase: amps = kVA × 1000 ÷ (1.732 × volts). Use the nameplate voltage of your unit.
| Phase | Voltage | Full-load amps |
|---|---|---|
| Single-phase | 480 V | 6,944 A |
| Single-phase | 2.4 kV | 1,389 A |
| Single-phase | 7.2 kV | 463 A |
| Single-phase | 12 kV | 278 A |
| Single-phase | 19.92 kV | 167 A |
| Single-phase | 38.11 kV | 87.5 A |
| Single-phase | 66.4 kV | 50.2 A |
02Types and Nameplates for a 3333 kVA Transformer
The verified catalog type for this rating is substation power, rather than a standard distribution pad-mount size. Large substation units may be part of a bank and can have radiators, cooling fans, tap equipment and other accessories. Construction and accessories vary by manufacturer and by the specific design; the nameplate and photos are the best way to identify the unit.
A 3333 kVA figure can also appear as a fan-stage value on a three-phase dry-type transformer nameplate. In that case, the cooling-stage rating does not establish the transformer’s phase. Check the nameplate’s phase field and all listed kVA stages instead of assuming that every appearance of “3333” refers to a single-phase unit. See more about substation and power transformers.
- Record the manufacturer, serial number and year, if visible.
- Include phase, kVA stages, frequency and cooling class.
- Photograph primary and secondary voltages, connections, taps and impedance.
- Show accessories, overall condition and any visible missing parts.
03How to Read the 3333 kVA Full-Load Amps Chart
The full-load amps chart rendered on this page pairs the catalog’s single-phase rating with several listed voltage values. Find the voltage row that matches the nameplate winding you are checking, then read across to the corresponding full-load current. The chart is a reference for the listed voltage and phase; it does not prove that a particular transformer was built with that voltage combination.
For single-phase calculations, full-load current is approximately kVA multiplied by 1,000, divided by voltage. Actual nameplate ratings, taps and operating conditions govern equipment selection and operation. Do not infer phase from a current figure or from a cooling-stage entry. For more detail on the relationship between kVA, voltage and current, use this guide to transformer kVA and amps.
04Where a 3333 kVA Unit May Fit in California
At this rating, the documented application is as a single-phase power bank component. A unit may be relevant to a substation or other power-system installation, but the nameplate, design, condition and owner’s intended configuration determine whether it fits a particular project. California utility systems use multiple primary voltages, so do not assume a match based only on where the transformer is located.
Confirm the actual high- and low-voltage values, winding connections and tap range against the project requirements and serving utility specifications. For example, California systems include different distribution and subtransmission voltage classes; suitability depends on the exact equipment and application. A transformer buyer can review its specifications, but cannot establish utility acceptance or approval. See the details of a substation transformer buyer’s review process.
05Physical Size, Weight and Removal Planning
A 3333 kVA substation power transformer is substantial electrical equipment, but there is no single dependable size or weight for every unit. Dimensions and shipping weight vary by manufacturer, cooling arrangement, accessories and construction. Use the nameplate’s total weight, tank-and-fittings weight or core-and-coil weight where provided, and share overall photos to help identify the configuration.
Do not try to open, disconnect, drain or move the transformer to gather information. Take photos only from a safe position and where you are authorized to access the equipment. Qualified electrical personnel or the serving utility handle isolation and disconnection. In the written offer, the seller and buyer can confirm who handles loading, rigging and freight before pickup.
06What Affects the Value of a Used 3333 kVA Transformer
A used or surplus 3333 kVA transformer is assessed as an individual unit. Rating matters, but buyers also need to know phase, voltages, taps, impedance, cooling, winding material and condition. A new-surplus unit with traceable records is different from equipment that has been energized or removed from service, and a missing accessory or damaged bushing can change its usefulness.
Test reports and environmental records help clarify condition and handling needs. Relevant information may include factory reports, insulation or turns-ratio tests, fluid records and PCB documentation. A buyer may ask about visible leaks, rust, missing parts, ownership and site access. PCB status should be supported by testing and documentation, with questions referred to qualified environmental professionals; this information is not legal advice. Read more about factors that affect a used transformer’s value.
07What to Send for a 3333 kVA Transformer Offer
To start a review, provide the information you already have. A clear nameplate photo is especially helpful; do not remove covers or approach energized equipment for a better image. If documents are unavailable, say so rather than estimating a specification.
California Transformer Buyer buys from sellers located in California. The seller must own the transformer or have authority to sell it; equipment owned by a utility cannot be sold by the property owner. You can send transformer details for a review or text photos to Rocky at (951) 403-5738.
- Nameplate and overall photos, taken from a safe position
- Quantity, California location and known condition
- Test reports and fluid or PCB records, if available
- Ownership or authorization details
- Site access information and any known removal constraints
08Written Offers and Pickup Terms
After reviewing the details, Rocky may ask follow-up questions about records, condition, ownership or access. If the unit is a fit, the written offer states the price, what is included, who handles loading or rigging and freight, and payment terms and timing. Review those terms before pickup is arranged.
You can call or text (951) 403-5738, or use the contact form to request an offer. Reviewing your transformer costs nothing and creates no obligation.
kVANearby Transformer Sizes We Buy
FAQ3333 kVA Transformer FAQ
Is every transformer marked 3333 kVA single-phase?
No. The catalog rating here is single-phase, but 3333 kVA can also appear as a fan-stage value on a three-phase dry-type nameplate. A cooling-stage value alone does not define phase. Check the nameplate’s phase field and its complete list of kVA ratings, and share a clear photo if you want help identifying what the markings describe.
Is a 3333 kVA transformer the same as a 3000 kVA transformer?
No. They are distinct nameplate ratings. Although 3000 kVA is a common commercial size, it is not the same rating as 3333 kVA. The cited IEEE C57.12.00-2015 preferred single-phase rating list includes 3333 kVA. When comparing units, verify the actual rating, phase and other nameplate specifications rather than treating nearby sizes as interchangeable.
Can you buy a 3333 kVA pad-mount transformer?
The verified catalog identifies substation power as the common type at 3333 kVA, not a standard pad-mount configuration. If your unit is pad-mounted, send the nameplate and overall photos anyway; its actual rating, construction and condition can be reviewed individually. Do not rely on a description or assumed type when the nameplate is available.
What if the nameplate is missing or hard to read?
Send the clearest photos you can safely take of the nameplate area and the whole transformer. Include any existing drawings, test reports, purchase records or other documentation that may help identify the unit. Do not open a compartment or approach energized equipment to find markings. Explain which details are unknown so they can be checked during the review.
Do you need test reports before reviewing my transformer?
You can start with photos, quantity, location and known condition. If you have factory test reports, field test results, fluid or PCB records, include them because they can help explain the equipment’s condition and history. If records are not available, say so. Follow qualified electrical and environmental professionals for testing or handling questions.
Can I sell a transformer located on my property if a utility owns it?
No. The seller must own the transformer or have authority to sell it. A utility-owned unit located on private property cannot be sold by the property owner. If ownership is unclear, check purchase, installation or service records and confirm authority before requesting an offer. Include any relevant ownership information when you contact California Transformer Buyer.