A 150 kVA three-phase transformer often serves commercial buildings and light industrial facilities where lighting, receptacles, larger HVAC equipment or kitchen loads need a different voltage from the incoming supply. At this size, we buy indoor dry-type units and outdoor three-phase pad-mount transformers, along with other configurations carrying the same rating.
If you want to sell 150 kVA transformer equipment after a renovation, service change or project cancellation, start with the complete nameplate rather than the cabinet dimensions. Two units rated 150 kVA can have very different applications. Our transformer size guide helps distinguish this rating from nearby sizes without relying on appearance.
01What the 150 kVA Three-Phase Rating Means
The 150 kVA marking identifies the transformer's rated apparent-power capacity under its specified operating conditions. On a three-phase nameplate, it normally describes the total rating across all three phases, not 150 kVA per phase. It is not a direct statement of the connected equipment's real-power consumption in kilowatts.
For a three-phase transformer, full-load current is calculated as amps = kVA × 1,000 ÷ (√3 × line-to-line volts). For example, a 150 kVA unit with a 480-volt winding has a rated full-load current of approximately 180 amps on that winding. The other winding has a different current when its voltage differs.
Use the amp table on this page to compare winding currents at common voltages. Our kVA and full-load amps guide explains the relationship in more detail. Current calculations do not establish whether a transformer is suitable for a particular installation; that requires the seller's or purchaser's qualified electrical professionals.
02Common Voltage Combinations at 150 kVA
A familiar commercial dry-type configuration is a 480-volt primary with a 208Y/120-volt secondary. That secondary provides 208 volts line to line and 120 volts line to neutral. Another configuration is a 600-volt primary with a 208Y/120-volt secondary, so photographs should show the actual voltage markings rather than a description such as “building transformer.”
Three-phase pad-mount units at 150 kVA may connect medium-voltage distribution to a low-voltage service. Examples include a 12470GrdY/7200 primary with a 480Y/277 or 208Y/120 secondary. The primary connection, insulation ratings and terminal arrangement matter alongside the voltage numbers.
Send the listed voltages exactly as printed, including delta or wye symbols and any tap information. We buy all brands, but the electrical configuration helps identify the application. A unit removed from kitchen service may share its rating with an HVAC transformer while having a different secondary voltage and enclosure.
Full-load amps for a 150 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 | 416 |
| 240 V | 361 |
| 480 V | 180 |
| 600 V | 144 |
| 2,400 V | 36.1 |
| 4,160 V | 20.8 |
| 12,470 V | 6.9 |
| 13,200 V | 6.6 |
| 13,800 V | 6.3 |
| 23,000 V | 3.8 |
| 34,500 V | 2.5 |
03Dry-Type and Pad-Mount Units Need Different Photos
For 150 kVA dry-type transformers, show the enclosure, ventilation openings and visible condition. The nameplate may identify aluminum or copper windings, temperature rise, insulation class and enclosure type. Dirt around vents, corrosion, missing covers or heat discoloration are useful condition details, not substitutes for test results.
For three-phase pad-mount transformers, photograph the cabinet exterior, nameplate, radiator surfaces if present and accessible fittings. Tell us whether the unit is dead-front or live-front when known. Do not open energized compartments or move equipment just to obtain a photograph.
On liquid-filled units, include the fluid designation, visible leaks and any available fluid records. Mineral oil and FR3 natural ester are different insulating fluids; neither a fluid description nor the transformer's age establishes PCB status. PCB status must be disclosed and documented. Do not drain fluid for a sale.
04Confirm the Rating Before Calling It a 150 kVA Unit
Look for the kVA field and the phase designation on the manufacturer's nameplate. A faded stock label, handwritten inventory tag or old panel schedule can be wrong. We need a photograph that lets us read the rating together with the model, serial number and voltage data.
If the plate shows multiple ratings, photograph the entire plate and explain any installed cooling equipment. Ratings tied to different cooling conditions should not be collapsed into a single number. For liquid-filled equipment, cooling designations such as ONAN and ONAF describe different cooling arrangements.
Nearby ratings are separate sizes, not interchangeable descriptions. If the plate reads 112.5 kVA, use our 112.5 kVA transformer page. Keep related cabinets and accessories identified by unit, especially when several transformers were removed from the same facility.
05Dimensions, Weight and Access Affect the Sale
There is no single shipping weight or cabinet footprint for every 150 kVA transformer. Dry-type and liquid-filled designs differ, and winding material, enclosure construction and accessories also affect weight. Use the nameplate weight, manufacturer's documentation or a reliable equipment record rather than an estimate based on kVA.
Measure overall height, width and depth, including protruding radiators or fittings. Tell us whether the unit is on a pallet, attached to a housekeeping pad, inside a mechanical room or behind a restricted gate. Stairs, narrow doors and limited overhead clearance are relevant even when the transformer itself is relatively compact.
We do not perform electrical disconnect work. Sellers use their own qualified electricians to de-energize and disconnect equipment. Describe its present location and access accurately so loading responsibilities can be addressed in the written terms rather than assumed from a photograph.
06What Makes a 150 kVA Transformer Useful to a Buyer
The 150 kVA rating fits a range of commercial and light industrial applications, but capacity alone does not determine demand for an individual unit. We pay attention to usable voltage combinations, complete enclosures, identifiable equipment and documented condition. A common configuration still needs to match a purchaser's electrical requirements.
New-surplus units should be identified as never energized only when that history is known. For used equipment, tell us about its service history and any available test data. Failed or damaged units are reviewed case by case; describe overheating, winding faults, fluid leaks or missing parts rather than simply labeling the unit “used.”
To sell 150 kVA transformer equipment, send an offer request with nameplate and overall photos, location, quantity and condition notes. We review the details and may ask about PCB status, test data or access. If it fits, our written offer spells out price, freight, loading and payment terms; pickup is scheduled with you and payment follows those terms. See how the selling process works for details.
Frequently asked questions
Can I sell a 150 kVA transformer with a 208Y/120 secondary?
Yes, Virginia Transformer Buyers buys 150 kVA three-phase transformers with a 208Y/120 secondary. Send the primary voltage too, because the secondary marking alone does not identify the complete configuration. Include a readable nameplate and condition photos, and tell us whether the unit is dry-type or liquid-filled.
Does 150 kVA mean 150 kVA on each phase?
No, a three-phase transformer's 150 kVA nameplate rating normally represents its total three-phase capacity. It is not multiplied by three to describe the unit's size. Photograph the phase and kVA fields together, especially if an inventory record describes a bank of separate single-phase transformers rather than one three-phase unit.
Can I sell a 150 kVA dry-type transformer without test reports?
Yes, you can submit a 150 kVA dry-type transformer without test reports. Tell us that records are unavailable rather than claiming the unit has been tested. We review its nameplate, photos and known condition and may ask additional questions. Available test data can help document condition, but missing records do not establish that equipment has failed.
Is a 150 kVA pad-mount transformer the same size as a dry-type unit?
No, the same 150 kVA electrical rating does not imply the same physical dimensions or weight. A pad-mount unit includes a liquid-filled tank and compartment arrangement, while a dry-type unit uses a different construction. Provide measurements and documented weight for the actual transformer so access and loading requirements are described accurately.
Will you buy a failed 150 kVA transformer?
Failed 150 kVA transformers are reviewed case by case. Tell Virginia Transformer Buyers what happened, whether a fault was diagnosed and whether components or fluid are missing. Include any available reports and disclose and document PCB status for liquid-filled equipment. Do not drain fluid or attempt electrical disconnect work to prepare the unit for review.