1250 kVA Three-Phase Pad Mounted Transformer
Source factory-direct 1250 kVA (1.25 MVA) pad mounted transformers for 1.0MW compute sites. Available in ready US stock or fully custom voltage configurations.
Precise 1250 KVA Continuous Power. In Stock & Custom Engineered.
Key apeclicaticns et a glanoe for quick eference and oontident plenning.
1250 kVA
Loop / Radial
ONAN
60 Hz
Outdoor Pad-Mounted
WAREHOUSE LOCATIONS
USA • Canada • UAE • China • Global Dispatch
FAST DISPATCH
Ready Stock • Ships in 1-3 Days • DDP Door-to-Door
Product Profile
The Apexto 1250 kVA (1.25 MVA) Three-Phase Pad-Mounted Transformer is the benchmark power solution for facilities requiring an exact 1.0 MW continuous electrical load. It is purpose-built to power high-density crypto mining containers and enterprise-grade data center halls.
Stepping down standard 13.8kV, 34.5kV, or 12.47kV utility lines to dedicated 415Y/240V, 480Y/277V, or 600V circuits, it supports custom primary and secondary voltage configurations engineered to match your site's specific Single-Line Diagram (SLD).
Each unit features a heavy-duty welded steel tank, tamper-resistant cabinet construction, and robust cooling capacity engineered to support continuous full-load operation, fully UL/cUL certified and DOE compliant for long-term reliability.
Core Advantages
01. High-Efficiency Radiators
Large external radiator panels maximize surface area for natural oil cooling, maintaining stable thermal performance during continuous 24/7 heavy-duty operations.
02. Auxiliary Control Box
Clearly organized terminals and control components simplify field wiring, commissioning, inspection, troubleshooting, and routine maintenance for faster on-site service and support.
03. Integrated Monitoring Panel
Integrated gauges provide clear temperature, pressure, and operating status information, helping technicians identify abnormal conditions quickly during routine transformer inspections and maintenance.
04. Low-Voltage Connection Panel
Clearly marked X0, X1, X2, and X3 terminals simplify low-voltage cable connections, phase identification, installation, inspection, and routine maintenance in the field.
05. High-Voltage Protection
H1, H2, and H3 terminals combine high-voltage connections with protection and voltage adjustment components, supporting safer installation, operation, inspection, and maintenance.
06. High-Dielectric Bushing Layout
Heavy-duty high-voltage bushings deliver superior electrical insulation and generous clearance, paired with a rugged steel tank built for decades of reliable service.
Full Specifications
External dimensions
L:1500mm、W:1600mm、H:1900mm
Internal dimensions
L:1450mm、W:1550mm、H:1850mm
Weight
3750KG
|
Rated Capacity |
1250 kVA / 1.25 MVA |
Phase |
Three Phase |
|
Frequency |
60 Hz |
Primary Voltage |
Customized (Typical 12.47kV / 13.8kV / 24.94kV / 34.5kV) |
|
Secondary Voltage |
Customized (Typical 480Y/277V) |
Winding Configuration |
Delta – Grounded Wye |
|
Winding Material |
Aluminum |
Cooling Type |
ONAN |
|
Insulation Fluid |
Mineral Oil |
Temperature Rise |
65°C |
|
Impedance |
5.25% |
Feed Configuration |
Loop Feed |
|
Connection Type |
Dead Front |
Tap Changer |
5-Position Off-Circuit Tap Changer |
|
Tapping Range |
±2 × 2.5% |
Standards |
IEEE / CSA / DOE |
Engineering Documents
Padmount Spec Sheet
Padmount Dimensional Drawings
Padmount Installation Manual
Padmount Test & Warranty Guide
Certifications & Grid Compliance
Fully compliant with UL, CSA, IEEE/ANSI, DOE, and IEC standards. Tested and certified by international authorities to ensure maximum safety, efficiency, and instant approval by local power utilities.
UL/cUL
CSA
CESI
IEEE
IEC
EN00676
AS-NZS
GOST
Infrastructure Capabilities
We supply a full lineup of pad-mount transformers built for heavy-duty power. From 24/7 crypto mining farms to mission-critical data centers, we deliver reliable equipment designed to run non-stop.
We also offer custom engineering tailored to your exact site. From specific high and low voltages to specialized enclosure specs, we customize and deliver units in as fast as 4–6 weeks to get your project powered up on schedule.
Procurement
Request a Project Quote
Tell us about your project or custom requirements. Our power systems engineers will review your specs and provide a tailored proposal.
Global Project References
View All >>
2 x 1000 kVA Pad-Mounted Transformers for Data Center
Dual 1000 kVA three-phase padmount units deployed to support high-density server racks and liquid-to-chip cooling infrastructure for a regional edge compute facility.
13.8 kV
480Y/277V
ONAN 1000 kVA
1000 kVA (1 MVA) Pad-Mounted Transformer for BESS Storage
Liquid-filled 1000 kVA transformer supplied for a commercial battery energy storage system (BESS) integration, providing reliable bidirectional grid stepping.
1000kVA
12.47 kV
480Y/277V
1000 kVA Pad-Mounted Transformer for Crypto Mining Pod
Rugged 1000 kVA pad-mount transformer powering an 800 kW hydro-cooled ASIC mining pod, delivering non-stop 415V power under extreme desert heat.
34.5 kV
415Y/240V
99.4% Efficiency
4 x 1000 kVA Pad-Mounted Transformers for Industrial Grid
Four 1000 kVA step-down padmount transformers installed for an advanced manufacturing plant, fully compliant with Hydro-Québec 600V distribution standards.
4 x 1000 kVA
24.94 kV GrdY
600Y/347V
Capabilities & Support
24-Month Quality Warranty
Enjoy peace of mind with our 24-month full warranty. If any operational issue arises with your transformer, our dedicated engineering team will resolve it rapidly and reliably.
Local Field Service Team
Whether in North America or global regions, our certified local engineering teams provide professional on-site transformer installation, energization testing, and maintenance.
24/7 Remote Video Support
Connect directly with our senior power engineers via live video for real-time installation guidance, system diagnostics, and instant troubleshooting support, anytime and anywhere.
Spare Parts & Support
We maintain an extensive inventory of genuine spare parts for fast dispatch, paired with lifetime technical guidance to maximize your equipment uptime.
Need a Customized Power & Transformer Solution?
Talk to our engineers to get an optimized configuration and fast quote.
FAQs
A 1250 kVA transformer gives a 1 MW power block useful capacity for cooling, UPS losses, pumps, controls, and other auxiliary loads, rather than sizing the transformer only for the computing equipment.
Yes. A 1250 kVA three-phase transformer delivers approximately 1,504A at 480V, making 1600A-class distribution a practical configuration when properly engineered.
Not automatically. Moving from 1000 to 1250 kVA increases available secondary current by 25%, so switchgear, breakers, cables, busway, and short-circuit ratings should be checked before the upgrade.
Choose 1500 kVA when the total project load already approaches the practical capacity of 1250 kVA or when additional mining equipment, cooling capacity, or near-term expansion is planned.
Yes. 1250 kVA works particularly well as a dedicated transformer for a 1 MW-class modular power block, allowing the electrical infrastructure to be repeated as the site expands.
Recommended Capacities
Discover our full lineup of three-phase pad-mounted transformers built for projects of any scale.
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1000KVA
1000 kVA Pad Mount Three-Phase Transformer
|
Primary Voltage |
2.4 kV – 34.5 kV Class |
|
Secondary Voltage |
120 V – 600 V Range |
|
Availability |
USA & China |
1500KVA
1500 kVA Pad Mount Three-Phase Transformer
|
Primary Voltage |
2.4 kV – 34.5 kV Class |
|
Secondary Voltage |
120 V – 600 V Range |
|
Availability |
USA & China |
2000KVA
2000 kVA Pad Mount Three-Phase Transformer
|
Primary Voltage |
2.4 kV – 34.5 kV Class |
|
Secondary Voltage |
120 V – 600 V Range |
|
Availability |
USA & China |
2550KVA
2550 kVA Pad Mount Three-Phase Transformer
|
Primary Voltage |
2.4 kV – 34.5 kV Class |
|
Secondary Voltage |
120 V – 600 V Range |
|
Availability |
USA & China |
