300 kVA transformer buyers for dry-type and padmount units
At this rating, we commonly review indoor dry-type transformers and outdoor liquid-filled padmount units. A dry-type unit may become surplus after a tenant renovation, distribution upgrade or manufacturing line change. A padmount may be available after a privately owned service is replaced or a development project changes its electrical design.
We buy individual units and groups of transformers, including unused equipment still in its crate. For a used 300 kVA transformer, tell us if it was operating before removal, why it was taken out of service and where it has been stored since. Failed units are also worth submitting, but describe the failure and any missing parts.
Our pages on dry-type transformers and padmount transformers explain those forms in more detail. Before offering an outdoor unit, confirm ownership: a utility-owned transformer belongs to the utility and cannot be sold by the property owner.
Full-load amps for a 300 kVA transformer
| Voltage (line-to-line) | Full-load current |
|---|---|
| 208 V | 832.7 A |
| 480 V | 360.8 A |
| 600 V | 288.7 A |
| 4,160 V | 41.6 A |
| 12,470 V | 13.9 A |
| 13,200 V | 13.1 A |
| 13,800 V | 12.6 A |
| 34,500 V | 5 A |
Calculated as kVA × 1,000 ÷ (1.732 × V) for a three-phase unit. Check the nameplate for the actual ratings. Use the kVA to amps calculator.
Common 300 kVA applications and voltage combinations
In New York commercial and industrial buildings, a 300 kVA dry-type transformer often supplies lower-voltage distribution from a higher-voltage building system. Common examples include converting 480 V to 208Y/120 V for receptacles, lighting and other building loads. Units with a 600 V primary also appear in industrial equipment installations.
A privately owned 300 kVA padmount may serve a commercial building, workshop or smaller industrial facility from medium-voltage distribution. Common primary ratings include 12,470 V, 13,200 V and 13,800 V, with secondary ratings such as 208Y/120 V or 480Y/277 V. These are examples, not a substitute for reading your unit’s plate.
Send a clear photograph showing both winding voltages, phase, frequency, taps and connection diagram. A voltage designation can include details that matter to compatibility, especially on medium-voltage equipment. We also need to know if the rating is three-phase or single-phase; kVA alone does not identify the electrical configuration.
300 kVA transformer full-load amps
The page’s full-load amps table shows calculated current at several voltages for a three-phase 300 kVA transformer. At 208 V, full-load current is 832.7 A; at 480 V, it is 360.8 A; and at 12,470 V, it is 13.9 A. The same kVA rating produces a higher current on the lower-voltage winding.
For three-phase equipment, the calculation is amps = kVA × 1,000 ÷ (√3 × line-to-line volts). Our kVA-to-amps calculator helps compare ratings, but use the nameplate to confirm the unit’s actual voltage and current specifications. Single-phase calculations use a different formula.
These figures describe rated current, not a complete installation design. They do not select conductors, overcurrent protection or service equipment by themselves. For our buying review, the useful information is the complete nameplate—not just an amperage written on a disconnect nearby. Include a readable photo even if you already know the primary and secondary currents.
Approximate weight and oil volume at 300 kVA
For initial pickup planning, a 300 kVA dry-type transformer may weigh approximately 1,500–3,500 pounds. A liquid-filled padmount may weigh approximately 2,500–5,000 pounds, including its fluid. Designs vary with winding material, enclosure, voltage class and accessories; check the nameplate rather than choosing lifting equipment from these rough ranges.
A 300 kVA oil-filled unit may contain approximately 100–250 gallons of insulating fluid. Check the nameplate and manufacturer documentation for the actual quantity and fluid type. Mineral oil and natural ester fluids are not interchangeable descriptions, so send the fluid label rather than calling every liquid-filled unit an oil transformer.
Our transformer weight guide provides additional planning context. For an offer and pickup plan, send:
- The stated total weight and fluid quantity, if available.
- Overall enclosure dimensions and photos of lifting provisions.
- Photos of leaks, tank damage or missing panels.
- Details of any skid, pallet or shipping base beneath the unit.
What affects the resale value of a 300 kVA transformer
We review voltage compatibility, condition, age, construction and available documentation when evaluating a 300 kVA unit. Common building-service voltage combinations can suit more replacement applications than unusual configurations. New-in-crate equipment, an intact nameplate and documented operating history give us useful information about potential reuse.
For dry-type units, photograph the enclosure and visible windings where they can be viewed safely. Report moisture exposure, overheating, physical damage and any missing covers. For padmounts, show the tank, bushings, compartments and fluid labels, and tell us about leaks or prior repairs.
Available test reports help us evaluate condition, but you can submit a unit without them. Send insulation-resistance, ratio or fluid test results if you already have them; we do not ask you to energize equipment for the offer.
Our guide to what a used transformer is worth explains the broader factors. For liquid-filled units, provide known PCB status and available records, and confirm current handling requirements with the appropriate environmental authority.
How we quote and pick up your 300 kVA unit
To sell a 300 kVA transformer, call or text 951-403-5738 or send an online offer request. Include nameplate photos, condition, pickup location and access details. We review the information and provide a written offer; our buying process explains the steps from review through payment.
At this size, access and handling matter. Tell us if the transformer is inside a basement, on a housekeeping pad, behind a fence or beside an accessible loading area. Include doorway dimensions, stairs, overhead restrictions and the distance to a truck loading position.
We coordinate rigging, forklift or crane handling and suitable trucking, or you can load the unit if you prefer. Qualified electrical personnel should disconnect and make the equipment safe before handling; lifting equipment must suit the confirmed weight and lift arrangement.
At pickup, we inspect the unit to confirm it matches the photos, with payment by check, ACH or wire under the agreed terms. We coordinate pickup statewide and have no public New York storefront or drop-off yard.
Questions sellers ask about 300 kVA
Who buys used 300 kVA transformers in New York?
We buy used 300 kVA transformers anywhere in New York State, including dry-type and padmount units. We also review new surplus, removed-from-service, failed and scrap equipment. Send the nameplate, condition photos and pickup location so we can evaluate the transformer and provide a written offer.
How much does a 300 kVA transformer weigh?
For rough planning, a dry-type unit may weigh approximately 1,500–3,500 pounds, while a liquid-filled padmount may weigh approximately 2,500–5,000 pounds. Check the nameplate and manufacturer documentation for the actual weight. We use confirmed weight, dimensions and site access to coordinate appropriate pickup equipment.
How many amps is a 300 kVA transformer at 480 volts?
A three-phase 300 kVA transformer has a calculated full-load current of 360.8 A at 480 V. That calculation uses line-to-line voltage and applies to the winding rated at 480 V. Check the nameplate for the actual configuration; single-phase equipment uses a different calculation.
Can I sell a 300 kVA transformer that is still connected?
We can review photos and basic details while the transformer is still installed, provided you own it. Tell us when disconnection is planned and what access will be available afterward. Qualified electrical personnel must make it safe before handling. A property owner cannot sell a utility-owned transformer.