250 kva three phase step down transformer
You’re not guessing—you know your load needs 208V or 240V, but your power feed is 480V or even 600V. That’s where a 250 kVA three phase step down transformer fits in. It’s the right size for small building wings, equipment clusters, or secondary panels—and we size it exactly to your layout and voltage pair.
We build dry-type units with copper or aluminum windings, front or top terminals, and tight enclosures that fit inside your electrical room. Whether you’re feeding HVAC, elevators, or automation gear, we keep it simple: 480 in, 208 or 240 out—no frills, no surprises.
Clients across the US and overseas have installed our 250 kVA units in schools, factory mezzanines, and storage sites—fast to mount, easy to wire, and dead quiet once running.
📩 Tell us your voltage and where it’s going. We’ll quote you something that actually fits the job.
Photovoltaics – Phoenix, Arizona, USA
One EPC firm in Phoenix was building a carport solar array for a university. Their inverter output ran 480V, but the lighting and EV charger cabinets all needed 208V. The electrical engineer asked: “Can we just drop the voltage at the edge instead of pulling all the way to the main room?”
We sent them a 250 kVA 3 phase step down transformer, dry-type, 480 to 208Y/120V, sealed for outdoor use, compact footprint. It was mounted directly under the carport beam and fed three load clusters from there.
Their PM told us: “We saved 400 feet of conduit and four days of trenching. That one transformer changed the layout.”
Energy Storage – Nevada, USA
A BESS integrator in Nevada had a PCS stack putting out 600V, but the site’s monitoring system, fan bank, and SCADA all required 240V. They didn’t want to step down inside the inverter—too much thermal risk.
They called and asked: “Can you give us something that’ll handle it outside the cabinet?”
We built a 250 kVA step down transformer, 600V to 240V, front-access terminals, floor-mounted, Class H insulation. It was installed on a skid between the PCS and the O&M room, with zero change to PCS internals.
The integrator said: “Our techs liked this unit more than the PCS it was feeding.”
Data Center – Frankfurt, Germany
At a colocation site in Frankfurt, the tenant added a backup cooling pod that ran on 208V three-phase—but the site was wired for 480V. The facility engineer asked: “Can we isolate just this pod without touching the rest of the load center?”
We shipped a 250 kVA 3 phase step down transformer, 480 to 208V, with side terminals and top fan ventilation. It sat on vibration feet just beside the UPS. Install time? Under 2 hours.
Their tech said: “It worked first power-on. That’s not something we say often.”
Wind-to-Hydrogen – Minnesota, USA
A pilot site in Minnesota was using a 480V wind turbine output to power a hydrogen compressor—but one control rack needed 240V. They didn’t want a tap off the main system—it would’ve risked protection grading.
Their field tech said: “Just give us a clean drop to 240V and we’ll run our own panel.”
We sent a 250 kVA step down unit, 480 to 240V, open core-coil, ventilated with NEMA 3R enclosure. They wired it next to the skid and ran a dedicated panel for the compressor logic.
Later feedback: “The turbine fluctuates. The transformer never did.”
Healthcare – Birmingham, UK
A medical research facility was retrofitting a lab floor. Their new centrifuge and fume hood system came spec’d at 208V, but their building service delivered 400V. They didn’t want inverters or taps—they wanted fixed, isolated voltage.
The contractor said: “This lab needs clean power. No sharing loads.”
We supplied a 250 kVA dry-type step down transformer, 400V to 208V, epoxy-coated, low-noise core, mounted in the lab’s utility corridor. It ran six weeks continuously through startup testing.
The hospital wrote: “It’s the quietest part of the lab. And it never once faulted.”
- Data Sheet
- Three Phase Transformer Catalog
- Shinenergy Product Catalog
| Certification | UL |
| Phase | Three Phase |
| Rated capacity | UP TO 3000KVA Customized |
| Frequency | 50/60Hz |
| Work Efficiency | UP TO 99.05% |
| Protection Class | IP00/IP20/IP23/IP40/IP44/IP54 |
| Winding Material | Copper or Aluminum |
| Insulation level | Class F (155°C) Class H (180°C) Class N (200°C) Class R (220°C) |
| Designed lifetime | ≥30 years |
| Cooling Method | Air Cooling |
| Wiring Configuration | Δ-Y (Delta-Star)/Y-Y (Star-Star)/Δ-Δ (Delta-Delta)/Y-Δ (Star-Delta) /Δ-Z (Delta-Zigzag)/ Y-Z (Star-Zigzag) |
| Noise | ≤35 dB (1 meter) |
| Three Phase Transformer Catalog | |
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You Know the Voltage You Have. We’ll Give You the Voltage You Need.
Your facility’s wired for 480V, but the panel you just installed takes 240V. Maybe it’s 240V to 208V. Or 460V to 230V. Whatever the mismatch, a 3 phase step down transformer makes it all work—quietly, safely, and without changing the upstream system.
We’ve built dry-type 480 to 208 3 phase step down transformers, 240 to 208 units, and even oddball configs like 380V to 220V. Need something that drops one leg to single phase? We handle 3 phase to single phase step down transformer requests all the time. And yes, we’ll include the wiring diagram, or help you figure it out over the phone.
From small 5kVA jobs to full 250 kVA builds, every project starts with your load. We don’t guess. We use our own 3 phase step down transformer calculator to confirm what your system really needs—then build to match.
📩 Got a voltage mismatch? We’ll fix it without overthinking it.
Yes, that’s one of the most common use cases. A 480 to 240 3 phase step down transformer will give you stable, balanced voltage for standard U.S. industrial loads. We’ll make sure your output delta or wye matches your panel.
They’re close, but not the same. If you’re coming from a step down transformer 380V to 220V 3 phase, you’re likely working with European or export voltage. If your gear says 208V, you’ll want a true 3 phase step down transformer 240 to 208 setup.
You can. A properly configured step down transformer 3 phase to single phase can give you both. We often tap the secondary to provide 120V or 240V single-phase alongside your 208 or 240 three-phase. Just let us know your layout.
That’s common in older industrial sites. Many motors and control systems are rated 230V, but the building service is 460V. We build 3 phase 460 to 230 transformers with copper or aluminum windings, sized for motors, panels, or mixed loads.
Always. Every unit we ship comes with a clear, labeled 3 phase step down transformer wiring diagram—whether you’re landing it into a 208Y/120 system or a 240 delta. If you’re not sure how to land it, we’ll review your config with you before it ships.