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.
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Precise 1250 KVA Continuous Power. In Stock & Custom Engineered.
Key specifications at a glance for quick reference and confident planning.
Rated Capacity
1250 kVA
Feed Type
Loop / Radial
Cooling Medium
ONAN
Frequency
60 Hz
Installation
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 1250 kVA transformer is aimed at projects that need more operating margin than a standard 1 MVA unit can comfortably provide. It is commonly considered for high-density electrical loads, compute infrastructure, and industrial systems where continuous demand is expected to remain relatively high.
Rather than jumping directly to 1.5 or 2 MVA, a 1.25 MVA unit can offer a more balanced relationship between installed capacity and expected load. Primary voltage, secondary voltage, feed type, taps, and protection can all be configured to suit the project.
This makes the 1250 kVA model especially useful where additional thermal and electrical headroom is needed without excessive oversizing.
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. Multi-Tier Fuse & Switch Bay
Integrates accessible Bay-O-Net fuses with a four-position load-break switch (Source A/B) and a tap changer, ensuring instant fault isolation and safe power transfer.
04. 6-Bushing Loop Feed System
Features six dead-front high-voltage bushings (H1A–H3B) with insulated caps to support loop-feed daisy-chaining, guaranteeing continuous and flexible cable routing.
05. Complete Monitoring Gauges
Features precision dial temperature, pressure/vacuum, and oil level gauges alongside a sampling valve, ensuring continuous visibility of internal operating status.
06. Heavy-Duty LV Spade Busbars
Fitted with heavy-duty tin-plated NEMA spade terminals (X0–X3) engineered for high current throughput, minimizing contact resistance and easing multi-cable landing.
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.
Design
Raw Material Procurement
Assembly
Testing
Packaging
Delivery
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.
Submit Inquiry ➔Global Project References
View All >>
Narvik, Norway
6 x 1250 kVA Transformers for Nordic ANTSPACE Hydro Farm
Six 1250 kVA (1.25 MVA) padmount units deployed to power an array of ANTSPACE hydro containers, utilizing 100% renewable Norwegian hydroelectric power.
22 kV Class
415Y/240V
99.50% Efficiency
Manchester, United Kingdom
1250 kVA Pad-Mounted Transformer for Automated Factory
Three-phase 1250 kVA step-down transformer installed inside a secured enclosure, delivering continuous 1.0MW power for an advanced robotics and CNC plant.
1250 kVA
11 kV Class
400V / 480V
Neuquén, Argentina
1250 kVA Padmount Transformer for Stranded Gas Mining Pod
Rugged 1250 kVA transformer engineered for remote desert oilfield conditions, converting generator power to stable 415V for a 1.0MW ASIC mining pod.
13.2 kV Class
415Y/240V
100% Factory Tested
Williston, North Dakota, USA
1250 kVA (1.25 MVA) Transformer for 1MW Modular Compute Skid
High-efficiency 1250 kVA pad-mounted transformer directly coupled with a 1.0MW containerized compute skid, fully compliant with US utility interconnection codes.
1250 kVA
12.47 kV Class
480Y / 415V
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.
Contact SalesFAQs
Why is 1250 kVA a good transformer size for a 1 MW compute or mining block?
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.
Can a 1250 kVA transformer feed a 1600A switchboard at 480V?
Yes. A 1250 kVA three-phase transformer delivers approximately 1,504A at 480V, making 1600A-class distribution a practical configuration when properly engineered.
Should I choose 1250 kVA instead of 1000 kVA for a 1 MW project?
Yes, if the project demand is close to 1 MW. A 1000 kVA transformer leaves little capacity once cooling and auxiliary loads are added, while 1250 kVA provides 25% more transformer capacity without moving directly to 1500 kVA.
What if 1 MW is only the miner or IT equipment load?
Then the transformer should not be selected from the 1 MW figure alone. Cooling, pumps, UPS losses, networking, controls, lighting, and other auxiliary loads must be added before confirming whether 1250 kVA is sufficient.
Can I upgrade an existing 1000 kVA transformer to 1250 kVA without changing the downstream equipment?
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.
When should I choose 1500 kVA instead of 1250 kVA?
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.
Is 1250 kVA suitable for a modular data center or containerized mining deployment?
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.
View All >>
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 |
Precise 1250 KVA Continuous Power. In Stock & Custom Engineered.
Key specifications at a glance for quick reference and confident planning.
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 1250 kVA transformer is aimed at projects that need more operating margin than a standard 1 MVA unit can comfortably provide. It is commonly considered for high-density electrical loads, compute infrastructure, and industrial systems where continuous demand is expected to remain relatively high.
Rather than jumping directly to 1.5 or 2 MVA, a 1.25 MVA unit can offer a more balanced relationship between installed capacity and expected load. Primary voltage, secondary voltage, feed type, taps, and protection can all be configured to suit the project.
This makes the 1250 kVA model especially useful where additional thermal and electrical headroom is needed without excessive oversizing.
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. Multi-Tier Fuse & Switch Bay
Integrates accessible Bay-O-Net fuses with a four-position load-break switch (Source A/B) and a tap changer, ensuring instant fault isolation and safe power transfer.
04. 6-Bushing Loop Feed System
Features six dead-front high-voltage bushings (H1A–H3B) with insulated caps to support loop-feed daisy-chaining, guaranteeing continuous and flexible cable routing.
05. Complete Monitoring Gauges
Features precision dial temperature, pressure/vacuum, and oil level gauges alongside a sampling valve, ensuring continuous visibility of internal operating status.
06. Heavy-Duty LV Spade Busbars
Fitted with heavy-duty tin-plated NEMA spade terminals (X0–X3) engineered for high current throughput, minimizing contact resistance and easing multi-cable landing.
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.
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.
Submit Inquiry ➔Global Project References
View All >>
6 x 1250 kVA Transformers for Nordic ANTSPACE Hydro Farm
Six 1250 kVA (1.25 MVA) padmount units deployed to power an array of ANTSPACE hydro containers, utilizing 100% renewable Norwegian hydroelectric power.
22 kV Class
415Y/240V
99.50% Efficiency
1250 kVA Pad-Mounted Transformer for Automated Factory
Three-phase 1250 kVA step-down transformer installed inside a secured enclosure, delivering continuous 1.0MW power for an advanced robotics and CNC plant.
1250 kVA
11 kV Class
400V / 480V
1250 kVA Padmount Transformer for Stranded Gas Mining Pod
Rugged 1250 kVA transformer engineered for remote desert oilfield conditions, converting generator power to stable 415V for a 1.0MW ASIC mining pod.
13.2 kV Class
415Y/240V
100% Factory Tested
1250 kVA (1.25 MVA) Transformer for 1MW Modular Compute Skid
High-efficiency 1250 kVA pad-mounted transformer directly coupled with a 1.0MW containerized compute skid, fully compliant with US utility interconnection codes.
1250 kVA
12.47 kV Class
480Y / 415V
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.
Contact SalesFAQs
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.
View All >>
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 |
Customize Your Power Solution
Share your requirements below. Our consultants will contact you via WhatsApp or email within 24 hours with a custom-matched proposal.
In-stock miners will ship within 3 business days. For bulk orders, please allow an additional 1-2 days via DHL Express, UPS, FedEx, or TNT.
Pre-order miner delivery times depend on the factory schedule. Estimated delivery dates are provided on the order page, but delays may occur due to production issues.
Shipments are processed on a first-paid, first-shipped basis. Once full payment is received, we aim to ship as quickly as possible. Payments via wire transfer (T/T) may take 3-7 business days to verify, while cryptocurrency payments typically take a few hours to 1 business day.
International shipping usually takes 5-8 business days, with remote locations potentially requiring 8-10 days.
*All sales are final and non-refundable. Please understand, this is an industry standard.
All products listed on our website are priced in US Dollars.
We accept payments via bank wire transfer or online cryptocurrency payment (BTC, ETH, KAS, USDT, USDC).
If you prefer other payment methods, please contact our sales team.
Important: All cryptocurrency payments received on the website are automatically converted to USDT. If a product is out of stock, we will contact you for a refund. The refund will be based on the USD price at the time of your original order.
We offer DDP (Delivery Duty Paid) shipping to some countries, including the United States, Canada, Russia, Dubai, and certain EU countries.
If you require DDP shipping, please contact our customer service. For countries without DDP shipping or for standard shipping, we can help reduce taxes by providing a lower invoice value.
Customs duties are not included in the total price. You will need to pay them once the goods arrive in your country. Simply contact your local logistics company to settle the fees. If needed, we can provide a commercial invoice with a declared value of your choice.
Please notify us immediately if customs requests documents, as improper filing may lead to higher fees or delays. We can provide the necessary documentation.
For new, factory-sealed miners, the warranty is typically 12 months or 6 months, depending on the factory's policy, starting from the production date.
The company is not responsible for issues resulting from failure to follow the provided instructions, specifications, or alterations to the product.
For used mining machines, there is no warranty or after-sales service; however, before shipment, we will provide mining machine testing videos to ensure you understand its performance. Once you confirm acceptance, we will proceed with full communication and arrange shipment.
Transportation and any other costs related to product returns are the responsibility of the purchaser.
The repair period will depend on the nature of the issue.
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Faye was very kind and helpful
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Buying miners from Apexto for 5 years
Buying miners from Apexto for 5 years - trustworthy, professional, and delivers quality!
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Easier than I expected. Thanks Faye
I'm very satisfied with my purchase (Elphapex Home). Additionally, I must thank Faye for the excellent service she provided; she answered all my questions whenever I needed.
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Fast Shipping
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