UL · CE · IEC 60076 Certified · Worldwide Shipping
China Transformer Supplier & One-Stop Export Sourcing Partner
From distribution, pad-mounted and pole-mounted transformers to power transformers up to 1000 kV — factory-direct pricing, fast lead times, full certifications.
Our Transformers
Factory-direct, certified, built to IEC & ANSI standards.
Pole-Mounted Transformers
Voltspan supplies single-phase and three-phase pole-mounted (overhead) distribution transformers from 5 kVA to…
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Pad-Mounted Transformers (ANSI & IEC)
ANSI-standard single-phase and three-phase pad-mounted transformers from 25 kVA to 167 kVA (single-phase) and …
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Oil-Immersed Distribution Transformers
Three-phase oil-immersed distribution transformers (S11 / S13 series) from 50 kVA to 2500 kVA, 10 kV / 15 kV c…
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Dry-Type (Cast Resin) Transformers
Cast-resin and silicon-steel dry-type transformers up to 2500 kVA, 35 kV and below. F/H-class insulation, high…
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Power Transformers up to 1000 kV
Through our tier-1 factory partners (including TBEA-class and Huapeng-class plants), Voltspan also supplies po…
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Factory-direct sourcing
We source directly from China's top-tier transformer plants, backed by engineers with 10+ years in power utilities.
Certified for your market
UL for North America, CE & IEC for Europe, plus marine CCS/DNV/BV/ABS and nuclear-grade options.
From distribution to 1000 kV
One supplier for pad/pole/dry-type/oil-immersed and HV power transformers.
Factory-direct FOB pricing
Skip the brand premium. Direct China pricing with 30–45 day lead times.
Real factories behind every order
Voltspan partners directly with China's top-tier transformer plants — modern, crane-equipped workshops. From core cutting and winding to assembly, vacuum oil-filling and full routine testing, every unit is built and tested at qualified factories, then shipped worldwide. You get factory-direct pricing without sourcing the factories yourself.
- ✓ Modern partner-factory workshops
- ✓ Full routine & type testing
- ✓ UL / CE / IEC certified
- ✓ 30–45 day lead time
Guides & Resources
Top 10 Power Transformer Manufacturers in the World (2026)
A 2026 ranking of the world's leading power transformer manufacturers — from global giants to China-based factory-direct suppliers — and how to choose the right one for your project.
Best Dry-Type Transformer Manufacturers (2026)
The best dry-type (cast resin) transformer manufacturers in 2026, including IEC 60076-11 certified suppliers and China factory-direct options.
Pad-Mounted vs Pole-Mounted Transformer
Pad-mounted vs pole-mounted transformers — the key differences in mounting, safety, cost and applications, and how to choose the right one.
Oil-Immersed vs Dry-Type Transformer
Oil-immersed vs dry-type transformers compared — cooling, fire safety, efficiency, cost, maintenance and best applications.