01What a 37.5 kVA Transformer Rating Tells a Buyer
A 37.5 kVA transformer is rated to handle an apparent load of 37.5 kilovolt-amperes under its specified operating conditions. At this size, single-phase construction is common. The kVA rating alone does not identify the voltage, connection, enclosure or intended installation, so buyers need the full nameplate and a clear view of the unit.
This rating sits between common 25 kVA and 50 kVA single-phase sizes. The actual transformer must match the connected system and application; the rating by itself does not establish that it is a suitable replacement. Compare nearby sizes in the listings for 25 kVA transformers and 50 kVA transformers.
FLAFull-Load Amps for a 37.5 kVA Transformer
Rated full-load current at common California voltages. Single-phase: amps = kVA × 1000 ÷ volts. Three-phase: amps = kVA × 1000 ÷ (1.732 × volts). Use the nameplate voltage of your unit.
| Phase | Voltage | Full-load amps |
|---|---|---|
| Single-phase | 240 V | 156 A |
| Single-phase | 277 V | 135 A |
| Single-phase | 480 V | 78.1 A |
| Single-phase | 2.4 kV | 15.6 A |
| Single-phase | 7.2 kV | 5.21 A |
| Single-phase | 12 kV | 3.13 A |
| Single-phase | 19.92 kV | 1.88 A |
02Common 37.5 kVA Designs and Voltage Combinations
Common designs at this rating include single-phase pad-mounted units, overhead pole-mount transformers and low-voltage dry-type transformers. A pad-mount transformer is typically enclosed for ground-level installation; pole-mounted equipment is designed for overhead distribution. Indoor dry-type units use air rather than insulating liquid. See more about single-phase pad-mount transformers, pole-mount transformers and dry-type transformers.
Voltage combinations vary by model and service. Nameplates may show a medium-voltage primary paired with a low-voltage secondary such as 120/240 V, or a low-voltage dry-type unit with an input and output selected for building equipment. California distribution systems include different primary voltages by utility and service territory, so do not assume a unit's voltage from its location or enclosure. Use the actual nameplate and connection diagram.
03Where 37.5 kVA Units Are Used in California
A 37.5 kVA single-phase transformer commonly serves residential and light commercial loads or a single-phase equipment service. Depending on its voltage, enclosure and installation, it may be part of a local distribution system or supply building equipment. The best match for a particular project depends on the load, voltage, available service and applicable design requirements.
This is a distribution-size rating, not a typical station-class substation transformer rating. A unit that has been removed from service may still interest a buyer, but its configuration, condition and documentation determine whether it fits another application.
04How to Read the 37.5 kVA Full-Load Amps Chart
The full-load amps chart rendered on this page shows the calculated current for a 37.5 kVA single-phase transformer at several listed voltages. Find the row for the voltage you need, then confirm whether that voltage is the primary or secondary value on the specific nameplate. The chart is a reference, not a substitute for the transformer's actual rating and connection details.
For a single-phase calculation, current changes with voltage while the kVA rating stays the same. Do not use a row from the chart to infer that a particular transformer has that voltage combination. For help interpreting nameplate ratings and current, see how to read transformer kVA and amps.
05Physical Size and Weight Depend on the Design
A 37.5 kVA unit is generally a compact distribution transformer compared with large power or substation equipment, but its footprint and weight vary by manufacturer, enclosure, voltage class and construction. A pad-mounted cabinet, a pole-mounted tank and an indoor dry-type cabinet can have noticeably different shapes and handling requirements.
For an accurate review, send a clear overall photo and any nameplate fields listing total weight or tank-and-fittings weight. Do not estimate dimensions or weight from kVA alone. The buyer will need to understand the equipment and site access before pickup terms can be set.
06What Affects the Value of a Used 37.5 kVA Transformer
The kVA rating helps identify the unit, but it is only one part of an offer review. Voltage, phase, taps, connection, impedance, insulation type and whether the transformer is pad-mounted, pole-mounted or dry type all affect how useful it may be to another buyer. Commonly needed California voltages can also influence demand.
Condition and records matter. Leaks, corrosion, damaged bushings, missing parts or unclear ownership may affect the review, as can the unit's age, winding material, accessories and whether it is used or new-surplus. Test reports and available environmental documentation can help establish what is known about the equipment. For more detail, read what affects a used transformer's value.
- Manufacturer, serial number and year of manufacture
- Primary and secondary voltages, taps and connection
- Condition, completeness and available test reports
- Fluid type and PCB records, if liquid-filled
- Quantity, location and site access
07What to Send for an Offer on Your 37.5 kVA Unit
To start a review, send the nameplate photo, overall photos, quantity, California location and a brief description of condition. Include test reports, fluid or PCB records and details about missing parts if available. For new-surplus equipment, note whether it has remained unused and whether it is crated or on skids.
You can call or text Rocky at (951) 403-5738, or use the contact and offer request form. California Transformer Buyer reviews equipment from sellers in California only. The unit must belong to you or you must have authority to sell it; property owners cannot sell utility-owned equipment.
08Pickup Terms and Safe Equipment Access
After reviewing the information, Rocky may ask follow-up questions about testing, ownership, site access or environmental records. Any offer is provided in writing, including what is included, who handles loading or rigging and freight, and payment terms and timing. Reviewing a transformer costs nothing and does not obligate you to sell.
Do not open compartments, disconnect, move or otherwise work on energized equipment to gather information. Take photos only from a safe position and where you are authorized to access the equipment. De-energizing and disconnecting are tasks for the owner's qualified electrical contractor or serving utility. PCB status should be supported by records or testing and reviewed with qualified environmental professionals; this information is not legal advice.
kVANearby Transformer Sizes We Buy
FAQ37.5 kVA Transformer FAQ
Is 37.5 kVA usually a single-phase transformer rating?
Yes. The 37.5 kVA rating is commonly used for single-phase transformers, including pad-mounted, pole-mounted and low-voltage dry-type designs. Do not assume phase from the size alone, though. Confirm the phase and full voltage information on the nameplate, especially if the unit is part of a larger equipment package or has incomplete records.
Can I sell a 37.5 kVA transformer that was removed from service?
A pulled or previously energized transformer can be reviewed, as can a spare or new-surplus unit. The buyer will need information about its condition, configuration and documentation before deciding whether to make an offer. Equipment must be owned by the seller or offered by someone authorized to sell it. Utility-owned equipment cannot be sold by a property owner.
What if the nameplate is hard to read or missing?
Send the clearest photos you can safely take, including any visible manufacturer markings, serial number, terminals, enclosure and overall views. Do not open the unit to search for hidden information. If you have purchase records, test reports, drawings or prior maintenance documents, include those too. The buyer may ask follow-up questions, but missing rating details can limit how confidently the unit can be identified.
Does a 37.5 kVA transformer need to be tested before I request an offer?
You can request a review with the information you already have; test reports are useful but not always available. Share any factory report, oil test, insulation resistance or turns-ratio results that exist. Do not arrange testing or handle fluid without qualified professionals. A buyer may ask what testing has been completed and whether records support the equipment's condition.
What photos should I text when asking about a 37.5 kVA transformer?
Text a readable nameplate photo and several overall views showing the entire unit, enclosure and visible condition. If safely accessible, include photos of visible damage or missing components without opening compartments or approaching energized parts. Also provide the quantity, city or general location, and whether the transformer is used or new-surplus. Send only photos of equipment you are authorized to access.
Can California Transformer Buyer arrange removal of the transformer?
Pickup and removal responsibilities are addressed in the written offer before anything is scheduled. The offer states what is included and who handles loading or rigging and freight, so review those terms before agreeing. Do not disconnect or move the transformer yourself. The owner's qualified electrical contractor or serving utility handles electrical isolation and disconnection.