Single-phase transformers for lighting, control, isolation, and smaller commercial loads. 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 single-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 dry-type units ready to ship for the most common ratings.
We hold inventory on the configurations that turn fastest in the market: control transformers and small lighting units in the lower KVA range, mid-size commercial units in the 25–100 KVA range, and larger distribution units up to 500 KVA. 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 single-phase transformer applications break down by input (primary) voltage. Use the table below to navigate by what is feeding the unit:
Output (secondary) voltage on single-phase transformers is most commonly 120/240V split-phase for residential, lighting, and small commercial loads. Other secondary configurations are available for specific applications. Tell us your input and required output and we will match the configuration.
Single-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 source single-phase transformers across the full capacity and voltage spectrum used in commercial, industrial, and medium-voltage applications.
Most single-phase transformer demand sits in the low-voltage range. Medium-voltage single-phase units are typically specified for distribution applications, agricultural service, and bank configurations where multiple single-phase units serve three-phase loads.
Most single-phase transformer applications are indoor. Outdoor units are specified for rooftop equipment, exterior pads, and sites where weather exposure requires sealed or weather-resistant enclosures. Confirm enclosure type up front to avoid field returns.
Single-phase transformers we supply are built to distribution class standards under ANSI/IEEE C57.12.01 and related test code C57.12.91. This covers:
If your project specifies a non-standard configuration, send the spec and we will source accordingly.
Single-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, nameplate photo, or voltage requirement? Send it over and our team will help match the right single-phase transformer configuration before quoting.
Single-phase and three-phase dry-type transformers serve different load types and applications. The right choice depends on what is feeding the unit and what loads it serves.
Most commercial and industrial buildings run on three-phase service, so three-phase transformers handle the majority of distribution. Single-phase is the right call when the service is single-phase, the load is small, or the application requires isolation or dedicated single-phase service. We stock both.
Browse our three-phase transformer category if your application calls for three-phase instead.
Single-phase transformers support commercial, industrial, utility, and renewable applications that require reliable single-phase power. We supply units for planned projects, facility upgrades, and emergency replacement needs.
Investor-owned utilities and co-ops, including municipal utilities and rural electric co-ops, use single-phase transformers for residential laterals, small commercial drops, agricultural service, rural feeders, and banked configurations. We support both scheduled procurement and urgent replacement needs.
Data centers and crypto mining facilities use single-phase transformers for control circuits, auxiliary loads, lighting distribution, monitoring systems, and isolation applications. We help source units when factory lead times do not match project deadlines.
Oil and gas sites use single-phase transformers for pump jacks, well sites, communications equipment, lighting, and control systems. We can help match units for new builds, distributed loads, harsh environments, and emergency replacements.
Solar farms, wind sites, microgrids, and small commercial renewable installations use single-phase transformers for auxiliary loads, control systems, lighting, small inverter applications, grid-tie, and isolation. 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.
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KVA rating should reflect connected load, expected diversity, and any growth or motor inrush you need to plan for. Send:
Undersized single-phase transformers run hot and lose insulation life. Oversized units waste capital and run inefficiently. We will recommend a rating that fits your load profile without overbuilding.
Primary voltage is set by the source feeding the unit. 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.
Single-phase transformer installations need to account for ventilation, sound, and clearances:
If your installation has site-specific constraints, mention them on the quote request.
Sizing a single-phase transformer comes down to two questions: what is the connected load (KVA), and what voltages are required on the primary and secondary?
Single-phase KVA = voltage × current ÷ 1000.
For a 240V load drawing 100A, that's 24 KVA. Apply a diversity factor (0.7–0.9 for mixed loads), add growth headroom, and round up to the nearest standard rating. For motor loads, add an increment to handle inrush, which typically runs 6–8 times the running current at startup. Send the load schedule and we will confirm the right size.
Most single-phase transformer applications use one of a few standard voltage combinations:
Other combinations are available for specific applications. Send your primary and required secondary and we will match the configuration.
H2LV supplies single-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. Single-phase transformers are typically lighter and easier to move than three-phase or liquid-filled units, which means faster turnaround on freight, easier installation logistics, and lower delivery cost.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.
Our single-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 single-phase 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 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 single-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.
