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Power‑hungry manufacturers and OEMs in the USA can now secure premium EI transformer cores that cut losses by up to 35% while keeping unit cost below the industry average.
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Pain Point 1 – Excessive Price
Average US‑market EI cores cost $2.45 / kg, 20‑30% higher than Asian benchmarks. This price gap erodes profit margins for high‑volume production lines.
Pain Point 2 – Low Quality & High Losses
Out‑of‑spec lamination thickness and inconsistent grain orientation cause core losses of 0.9 W/kg, increasing energy consumption by 12‑18%.
Pain Point 3 – Long Lead Times
Traditional suppliers quote 6‑8 weeks delivery, forcing you to keep safety stock that ties up capital.
Pain Point 4 – Limited Customization
Standard EI dimensions rarely match your design, leading to costly redesigns or inefficient magnetic paths.
Pain Point 5 – Unclear Compliance
Missing certifications (UL, IEC, RoHS) expose you to regulatory risk and potential shipment delays.
| Parameter | Value | Unit |
|---|---|---|
| Core Type | EI (E‑I) Laminated | - |
| Material | Grain‑oriented Si‑steel (0.35 mm) | - |
| Core Loss | 0.45 | W/kg @ 50 Hz |
| Maximum Flux Density | 1.6 | T |
| Standard Sizes | E‑10, E‑12, E‑15, E‑20 | mm |
| Temperature Range | ‑40 ~ +150 | °C |
| Certifications | UL, IEC, CE, RoHS, ISO 9001 | - |
• Industrial Motor Drives – A US‑based pump manufacturer reduced total harmonic distortion by 22 % after switching to our low‑loss EI cores. Request the full case study.
• Renewable Energy Inverters – Our custom‑cut cores enabled a solar‑inverter OEM to shrink board area by 15 % while meeting IEC‑61850 standards.
• Medical Imaging Equipment – A CT‑scanner supplier achieved a 30 % drop in standby power consumption with our high‑frequency‑rated EI cores.
Standard stock cores ship within 7‑10 days. Custom OEM/ODM cores are produced in 14‑21 days after design approval and tooling confirmation.
Yes. Every shipment includes a test report and certificates (UL 1007, IEC 61869‑2, RoHS) attached to the packing list.
Free samples (up to 2 kg) are available for qualified buyers. Shipping is on us for U.S. mainland addresses.

We accept T/T (30 % deposit, 70 % balance), L/C at sight, and PayPal for orders under $10,000.
All cores carry a 12‑month warranty against material defects. Our technical team provides 24/7 online support and on‑site troubleshooting if needed.
Limited‑time offer: Free engineering consultation + 5 % discount on your first order (valid until 30 May 2026). Stock is limited to 10 kW of custom cores per week.
Email Quote Now WhatsApp ChatAll transactions are secured, and we provide a 30‑day money‑back guarantee on sample cores.
Emily R., Purchasing Manager – SolarTech USA
“The fast 12‑day delivery saved us a critical project deadline. Core loss performance exceeded spec by 0.08 W/kg, delivering a measurable ROI within 3 months.”
Robert K., Technical Director – MedEquip Corp.
“Xinchangda’s OEM service let us specify a 4 mm window for our MRI‑compatible transformers. The UL certification arrived with the shipment, simplifying our compliance audit.”
Sarah L., Operations Lead – AeroDynamics Inc.
“Cost per kilogram dropped from $2.45 to $1.78, a 27 % reduction, while quality remained flawless. We’ve placed a repeat order for the next 12 months.”
Trusted By Leading Brands Worldwide
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Customer Testimonials
All products are backed by ISO 9001, CE, UL, RoHS, VDE, and IEC 61869 certifications. Our factory complies with China’s export control regulations and US import standards.