300 kVA 3-Phase Padmount Transformer
A 300 kVA transformer is a versatile solution for commercial buildings, light-industrial facilities, and distributed energy projects requiring reliable three-phase power without exceeding utility-scale capacity. This size is frequently used to support panelboards, HVAC systems, EV charging infrastructure, AI edge computing environments, and small data center loads.
Giga supplies three-phase pad-mounted 300 kVA transformers built for long service life, safe operation, and full IEEE/NEMA compliance. Whether you are replacing aging distribution equipment or planning a new installation, this page outlines the applications, voltage configurations, and sizing considerations to help streamline the quoting process.
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Applications and common use cases for a 300 kVA transformer
A 300 kVA transformer is typically deployed where moderate three-phase loads must be stepped down from medium voltage to usable facility voltage.
In AI and data-driven environments, a 300 kVA transformer often supports localized compute clusters, UPS systems, and cooling equipment that require precise voltage regulation and continuous-duty performance.
For contractors and engineers evaluating broader options, explore our full range of three-phase pad-mount transformers to compare enclosure types, cooling designs, and available stock.
Common applications include:
- Commercial office buildings and retail centers
- Light manufacturing and fabrication shops
- Multifamily developments and mixed-use projects
- EV charging stations and fleet electrification sites
- Distributed AI infrastructure and edge data centers
- Water and wastewater pump stations
Common voltage configurations
Most 300 kVA transformers are specified with medium-voltage primaries and low-voltage secondaries optimized for commercial distribution.
Voltage selection must align with utility service requirements and downstream panel specifications. Custom impedance and tap settings can be engineered to meet specific fault current and voltage regulation targets.
Standard configurations include:
- Primary Voltages: Typically 12.47 kV, 13.2 kV, or 13.8 kV.
- Secondary Voltages: Standard 480Y/277V or 208Y/120V.
- Winding Configurations: Delta or wye to match utility and site grounding.
- Construction: Three-phase pad-mounted, iil-filled design for thermal performance and outdoor durability.
Sizing and selection considerations
Selecting a 300 kVA transformer requires accurate load calculations factoring in total connected load, demand, motor starting requirements, and future expansion plans.
If your projected load approaches the upper limit of this rating, you may want to compare adjacent sizes, such as a 500 kVA pad-mount transformer for additional headroom. For smaller commercial loads, a 225 kVA transformer may provide a more cost-effective solution.
You can also browse transformers by kVA rating to evaluate capacity ranges side-by-side before requesting pricing.
This capacity is ideal when:
- Calculated demand falls between 225 kVA and 350 kVA (allowing for typical headroom).
- Redundancy is handled at the panel or system level rather than through transformer paralleling
- Space constraints limit the installation of larger pad-mounted equipment.
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Product Details
Specifications
This 300 kVA transformer is a three-phase, oil-filled pad-mounted unit designed for commercial and light industrial power distribution. Each unit features a welded steel tank, tamper-resistant cabinet construction, and cooling capacity engineered for continuous full-load operation. The design supports standard medium-voltage primary options with 480Y/277V or 208Y/120V secondaries and complies with applicable industry standards.
support
Our knowledgeable technical support team is available to answer any questions you may have about installation, operation, maintenance, or troubleshooting. We offer phone, email, and online support to help you resolve any issues promptly. Visit our service & support page for more information or contact our team.
free shipping
Giga offers free shipping within the contiguous United States on in-stock transformers, with most orders processed within 1 to 2 business days. International shipping options are available upon request.
warranty
Buy with confidence. All new Giga Energy transformers are tested and come with a full 3 year warranty against defects. If you experience any problems, our experienced customer service team is only a phone call away. Read our standard warranty here.
Manuals and documentation
Complete submittal drawings, user manuals, and specification sheets are available to support engineering review and installation planning.
Technical specifications
This oil-filled, tamper-resistant pad mount transformer is designed for reliable outdoor operation in commercial applications, with a robust welded steel tank, protective bushings, and an externally operated tap changer for voltage adjustment.
Typical characteristics for a 75 kVA pad-mount transformer include:
Final dimensions, weight, and impedance values vary based on voltage configuration and utility requirements.
Availability and lead time guidance
Availability for a 300 kVA transformer depends on primary voltage, secondary voltage, and utility specifications. Standard commercial configurations may offer accelerated lead times, while custom voltage combinations or impedance requirements typically require additional production time.
For accurate pricing and schedule confirmation, request a quote. Our team will promptly review your project details to confirm availability or build timelines.
FAQs
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What is a 300 kVA transformer used for?
A 300 kVA transformer is commonly used in commercial buildings, light industrial facilities, EV charging sites, and small data center environments. It steps down medium-voltage utility service to usable three-phase distribution voltages such as 480Y/277V or 208Y/120V.
How do I know if I need a 300 kVA transformer?
A 300 kVA transformer is appropriate when your calculated three-phase load, including demand factors and future growth, falls within this capacity range. We recommend a load study and coordination with your electrical engineer to confirm proper sizing.
What voltages are available for a 300 kVA transformer?
Typical primary voltages include 12.47 kV, 13.2 kV, and 13.8 kV. Common secondary voltages include 480Y/277V and 208Y/120V. Custom configurations may be available depending on utility and project requirements.
Is a 300 kVA transformer suitable for AI or edge data center loads?
Yes. A 300 kVA transformer is frequently used in edge data centers and AI deployments where localized compute clusters require stable, continuous three-phase power. For these high-duty cycles, proper cooling and load planning are critical.
What is the difference between pad-mount and dry-type 300 kVA transformers?
Pad-mounted 300 kVA transformers are oil-filled and designed for outdoor installation at ground level. Dry-type transformers are typically air-cooled and used indoors. The choice is usually driven by site conditions, fire code requirements, and space constraints.
What is the lead time for a 300 kVA transformer?
Lead times vary by configuration. While standard voltage combinations may be available for faster shipment, custom builds require additional manufacturying time. Request a quote for the most accurate delivery estimate.
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