Three-phase transformers for commercial buildings, data centers, hospitals, and industrial facilities. Up to 5 MVA and 15 KV, ready to ship.
Need a fast quote? Send KVA, primary voltage, secondary voltage, indoor or outdoor, enclosure type, quantity, ship-to location, and required delivery date.
Our three-phase transformer inventory is built for buyers who do not have time to chase availability. We stock units across the configurations contractors and EPCs specify most often, with new units ready to ship for the most common ratings.
We hold inventory on the configurations that turn fastest in the market: low-voltage three-phase units for commercial and industrial distribution in the 30–500 KVA range, larger units in the 750–2500 KVA range for industrial and data center applications, and select medium-voltage units for primary distribution. Less common configurations move through our supplier network, typically faster than going direct to factory.
Browse our dry-type transformers for current availability, or send your specs and our team will match a unit from inventory.
Most medium-voltage three-phase transformer applications break down by input (primary) voltage. Use the table below to navigate by what is feeding the unit:
For low-voltage primary applications (480V, 600V, and similar), see our specifications section below. Output (secondary) voltage typically steps down to 208Y/120V or 480Y/277V depending on the load. Tell us your input and required output and we will match the configuration.
The configurations we move most often through inventory and our supplier network include:
If your configuration sits outside this list, send your specs and we will check stock or source from our supplier network.
Need a three-phase transformer that matches your project specs? Send your KVA, input voltage, output voltage, enclosure type, and delivery timeline, and we will confirm what we can supply from stock or source quickly.
Three-phase transformer quotes move faster when the spec is complete. Send what you have and our team will fill the gaps. The more of the following you can confirm up front, the faster we can match a unit:
We supply both single-phase and three-phase dry-type transformers. Three-phase covers the majority of commercial, industrial, and distribution applications because most loads in those environments are three-phase: HVAC equipment, motors, elevators, large lighting systems, and process equipment.
For single-phase applications, browse our single-phase transformer category.
Three-phase transformers we supply are built to distribution class standards under ANSI/IEEE C57.12.01 and related test code C57.12.91. If your project specifies power class or a non-standard configuration, send the spec and we will source accordingly.
We source three-phase transformers across the full capacity and voltage spectrum used in commercial, industrial, and medium-voltage applications.
Medium-voltage three-phase units are typically specified for applications where the unit needs to step down from utility-supplied 5 KV or 15 KV service inside a building or vault, where mineral oil cannot be used.
These units cost more than equivalent liquid-filled designs, but they often pay back through lower fire suppression, containment, and ventilation costs on hospital, university, and data center installations.
Most three-phase transformer applications are indoor. Outdoor units are specified when liquid-filled transformers are not desired but the installation is exterior, such as rooftop equipment, equipment yards near occupied buildings, or sites with strict environmental restrictions on oil-containing equipment.
Indoor installations need to account for ventilation, ambient temperature, and sound, since dry-type units reject heat into the surrounding space.
Three-phase transformers ship in standard configurations, with options available for specific application requirements:
Send your accessory list and we will match the configuration before quoting.
Have a spec sheet, one-line diagram, or accessory list? Send it over and our team will help match the right three-phase transformer configuration before quoting.
Three-phase transformers are built and configured for specific applications. The right type depends on what the unit is doing in the system: stepping voltage up, isolating a drive, isolating sensitive equipment, or interfacing renewable generation with the grid.
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We supply step-up three-phase transformers for renewable generation tie-in, generator step-up, cogeneration, and specific industrial equipment that needs to interface lower-voltage output with plant distribution. Common configurations include 480V to 12.47 KV or 13.8 KV for renewable tie-in, and lower voltages stepped to 480V or 600V for equipment-specific applications.
Send the source voltage, output voltage, and KVA and we will quote accordingly.
Drive isolation transformers are designed for service with variable frequency drives (VFDs) and large motor loads. They provide electrical isolation between the source and the drive, reduce harmonic distortion reflected back to the source, and improve drive performance and protection.
These units are typically specified with K-factor ratings appropriate for the harmonic content of the connected drive load (K-4, K-13, or K-20 depending on harmonic severity). Common applications include large industrial VFD systems, HVAC drives in commercial buildings, and process equipment with significant non-linear loading.
Isolation transformers provide electrical separation between primary and secondary windings, typically with equal voltages on both sides (480V to 480V is common). They are used to break ground loops, reduce electrical noise, protect sensitive equipment, and provide safety isolation in applications such as healthcare, laboratories, and sensitive electronic equipment service.Isolation transformers are often specified with electrostatic shielding for additional noise reduction, and they may be specified with K-factor ratings for harmonic-heavy loads. Send your application and we will configure accordingly.
Solar transformers are optimized for inverter-output service: cyclic loading, harmonic content from inverters, and continuous reverse-power operation. Common applications include utility-scale collection (typically 480V or 600V inverter output stepped up to 34.5 KV collection voltage), distributed solar tie-in for commercial installations, and inverter step-up for residential and small commercial systems.
We work with renewable EPCs across both utility-scale and distributed solar projects.
Dry-type transformers are used where liquid-filled equipment is not allowed, practical, or preferred. We supply dry-type units for commercial, industrial, heaThree-phase transformers support the commercial, industrial, utility, and renewable applications where three-phase power is required. We supply units for planned projects, facility upgrades, and emergency replacement needs.lthcare, renewable, and critical-infrastructure applications.
Investor-owned utilities and co-ops, including municipal utilities and rural electric co-ops, use three-phase transformers for distribution feeders, commercial service, industrial customer drops, and substation applications. We support both scheduled procurement and urgent replacement needs.
Data centers and crypto mining sites rely on three-phase transformers for site distribution, PDU feeders, isolation, and medium-voltage step-down applications. We help buyers source units when factory lead times do not match the project schedule.
Oil and gas sites use three-phase transformers for gas processing plants, compressor stations, pump stations, and process equipment. We can help match units for new builds, harsh environments, and emergency replacements.
Solar farms, wind sites, and battery storage projects use three-phase transformers for collection, step-up, tie-in, auxiliary service, and grid-interconnection applications. We work with renewable developers and EPCs to source project-ready configurations.
We help buyers spec the right unit every day. Send what you have and we will fill in the gaps.
KVA rating should reflect connected load, expected diversity, and any growth or motor inrush you need to plan for. Send:
Three-phase transformers are sensitive to ambient temperature, ventilation, and harmonic loading. The rating that fits a well-ventilated electrical room with linear loads may be insufficient for a hot mechanical space serving VFDs.
We will recommend a rating that fits your load profile and installation environment without overbuilding.
Primary voltage is set by the building or utility distribution feeding the transformer. Secondary voltage is set by the load.
If your specifying engineer has provided a transformer spec or one-line diagram, send it as-is. We will confirm the configuration before quoting.
Three-phase transformer installations need to account for ventilation, sound, clearances, and harmonic loading:
If your installation has site-specific constraints, mention them on the quote request. Problems with ventilation, sound, or access are much cheaper to solve before the unit ships.
H2LV supplies three-phase transformers across the United States. Whether you are placing a planned procurement order for a multi-site rollout or chasing down an emergency replacement after a failure, we move fast.
We ship from regional inventory points and arrange freight on the timeline your project actually needs. For planned orders, we coordinate delivery to match construction schedules. For emergency replacement, we can arrange expedited freight to most locations in the lower 48.
Larger medium-voltage three-phase units may require permitted transport depending on size and route, and we handle those logistics directly. Indoor installations often require coordination with building access, freight elevator schedules, and rigging, especially for medium-voltage units in multi-story buildings.
Our three-phase transformer buyers include:
We tailor lead time, documentation, and shipping to whichever bucket you fall into.
H2LV is built around a simple idea. When you need a dry-type transformer, you should be able to talk to a team that knows the equipment, has stock on the ground, and gives you straight answers on price and lead time.
We carry deep inventory across new and reconditioned units. We move fast on emergency orders. We do not push you toward a unit that misses your spec. We do not pad lead times to make our quote look better. And we back every transformer we ship with technical support from people who have spent careers around this equipment.
If your last vendor sent back a quote that read like a stall, send us your specs and see the difference.
Send your three-phase transformer requirements and we will respond with availability, pricing, documentation, and a real lead time.
If this is an emergency replacement, mention that in the request so we can prioritize availability and freight options
