500kVA Three-Phase Dry-Type Transformer — 480V D - 208Y/120V, NEMA 3R

Three-Phase, 480V D - 208Y/120V in an outdoor-rated NEMA 3R enclosure — 1,388A at the secondary. Sourced to spec, with firm pricing inside one business day.

Sourcing

Sourced to your spec — not from a shelf

We procure each unit to your exact specification from our manufacturer and supply-partner network — fluid, feed configuration, taps, and accessories confirmed at quote. Tell us your requirement and need-by date.

Sourcing

Procured to your exact spec from our manufacturer and supply-partner network

Lead time

Quoted per unit and configuration — confirm with your need-by date

Quantities

Single unit or project quantities

Quote turnaround

Firm quote within one business day

Other ratings in this family — 25 / 30 / 37.5 / 50 / 112.5 kVA — are quoted from spec. Full 15–500kVA range: LV Dry-Type Transformers.

Specification

500kVA — key ratings

Nameplate ratings below. Secondary and primary full-load current are calculated from the kVA and voltage; taps, impedance, dimensions, and weight are confirmed against your spec at quote.

Type

Dry-type, three-phase

Rating

500kVA

Primary

480V D

Secondary

208Y/120V

Secondary amps

1,388A at full load (FLA)

Primary amps

601A at full load (FLA)

Enclosure

NEMA 3R (outdoor-rated)

Taps

±2 × 2.5% (four 2.5% taps) — standard; other arrangements on request

Impedance

Fixed by the factory for this rating; value confirmed on the nameplate and in the quote package

Standard

DOE 2016 · UL-listed

Warranty

5 years from date of shipment

Documentation & delivery

What you get, in writing

Quote package

Firm unit price, lead time, and delivery terms in writing — within one business day.

Nameplate data

Full nameplate on request — taps, impedance, and BIL confirmed against your spec.

Outline drawing

Dimensioned outline drawing for site layout, on request.

Test reports

Factory routine-test reports available on request.

UL listing

UL/cUL listed — file number provided on request.

Delivery

Crated for flatbed shipment. Freight quoted to your site; delivery terms confirmed at quote.

Selection & planning

500kVA — what it serves and what it draws

500kVA is the top of the common LV dry-type range. It is specified for central 208Y/120V distribution — building services, retail and healthcare central plants, machine rooms — where a ventilated dry-type is preferred and a liquid unit is not. The secondary delivers 1,388A at 208Y/120V.

A 500kVA unit supplies 400kW of real power to a load at 0.8 power factor, or 450kW at 0.9 — the kVA rating is fixed, the kW delivered depends on the load's power factor. Worked example: a 350kW load at 0.8 power factor draws 437.5kVA — 88% of this unit’s rating — which is normally the point at which a designer either accepts the margin or steps to the next standard rating.

Secondary full-load current

1,388A at 208Y/120V (500 × 1,000 ÷ (1.732 × 208))

Primary full-load current

601A at 480V D (500 × 1,000 ÷ (1.732 × 480))

Continuous duty

Rated for 100% continuous load at nameplate (1,388A). A transformer is not derated for continuous duty — size the secondary overcurrent protection and conductors per NEC 450.3 and 240.21(C).

Real power at load PF

400kW at 0.8 PF · 450kW at 0.9 PF

Physical data

Weight and enclosure dimensions are fixed by the factory for your configuration and are issued as a dimensioned outline drawing with your quote.

Compare

Other ratings in this range

Secondary full-load current for each rating, so you can size up or down against your calculated load.

Rating	Primary → Secondary	Secondary amps
25kVA	240V - 120V	208A	View →
30kVA	480V D - 208Y/120V	83.3A	View →
37.5kVA	240V - 120V	312A	View →
50kVA	240V - 120V	417A	View →
112.5kVA	480V D - 208Y/120V	312A	View →
500kVA	480V D - 208Y/120V	1,388A	This unit

Other ratings in this family are quoted from spec — the full 15–500kVA range is on the LV Dry-Type Transformers page.

FAQ

Common questions

How many amps is a 500kVA transformer?

At 208Y/120V, a 500kVA transformer delivers 1,388A at full load (500 × 1,000 ÷ (1.732 × 208)). The primary draws 601A at 480V D. The transformer itself is rated for continuous duty at nameplate — 1,388A. The 125% rule applies to branch-circuit and feeder conductors, not to the transformer; size the secondary conductors and overcurrent protection per NEC 450.3 and 240.21(C).

How much does a 500kVA dry-type transformer cost?

Pricing is quote-based — it moves with the market and your exact configuration. Request a firm quote and you will have it within one business day; a budgetary price schedule is available on request.

What is the lead time?

Lead times depend on the specification and manufacturer scheduling — quoted per unit. Tell us your need-by date and we confirm the ship window at quote.

Do you keep this unit in stock?

We don’t hold a fixed stock list — each unit is procured to your exact specification from our manufacturer and supply-partner network. Share your requirement and need-by date, and we confirm availability and lead time at quote.

What documentation comes with the unit?

Full nameplate data, a dimensioned outline drawing, factory routine-test reports, and the UL file number — all available on request.

What warranty applies?

Five years from date of shipment, covering windings, core, tank, and terminals. Full terms in our Terms & Conditions of Sale.

Can this unit be supplied in a different voltage or configuration?

Yes. Primary and secondary voltage, taps, fluid, feed arrangement, and accessory package are all confirmed at quote. Adjacent ratings and voltage classes are sourced routinely.

Request pricing for this unit

[email protected] · 718-973-0281

Pre-filled with this unit — edit the request freely.

Beyond transformers

Transformers are our main focus, but we are able to source other electrical equipment to fulfill project needs. Among these include motors, generators, and various types of switchgear. Sourced through the same supply channels, one PO, and the same point of contact ensures consistency and reliability across the board.