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Powerful factory • Quality Assurance • Custom Design • 7‑day delivery
Most overseas vendors quote 30‑45% higher than Chinese OEMs, eroding your ROI.
Unverified factories deliver up to 15% out‑of‑spec units, causing costly re‑work and warranty claims.
Typical lead times exceed 45 days, delaying product launches and inventory turnover.
| Parameter | Value | Unit |
|---|---|---|
| Core Type | Ferrite (E‑core) | |
| Primary Turns | 57 | |
| Secondary Turns | 30 | |
| Rated Power | 5 W – 50 W | |
| Operating Frequency | 20 kHz – 200 kHz | |
| Efficiency | ≥ 92% | |
| Dimensions (L×W×H) | 57 mm × 30 mm × 15 mm | |
| RoHS | Compliant |
Audio Amplifier OEM – Europe: Delivered 10 k units of custom‑wound ei 57x30 transformers in 9 days, cutting product‑launch time by 22%.
Medical Imaging – USA: Supplied CE‑certified units with ≤ 0.2 % THD, meeting FDA Class II requirements.
Industrial Motor Drives – Asia‑Pacific: Integrated into high‑efficiency inverters, achieving 15% energy savings over legacy designs.
ei-19-transformer 63-kva-dry-type-transformer-price couple-transformer Series-transformer
“Xinchangda delivered the ei 57x30 transformers ahead of schedule with zero defects. Our production cost fell by 28%.” – John Miller, Procurement Manager, AudioTech USA
“The OEM design service let us brand the transformer with our logo, saving us a separate supplier. Quality matched our ISO‑9001 standards.” – Lisa Chen, Operations Lead, MedEquip Ltd.
Our standard MOQ is 500 pieces. For larger projects we can accommodate 10 k+ units with volume discounts.
Yes. Our R&D team can adjust primary/secondary turns, add shielding, or apply powder‑coat finishes in any RAL color.
We accept 30% T/T deposit + 70% L/C at sight, or PayPal/Western Union for samples.
Air freight: 3‑5 business days; sea freight: 12‑18 days (port‑to‑port). We handle customs clearance and provide tracking.
All transformers come with a 12‑month limited warranty. Our technical support desk is available 24/7 via email, phone, or WhatsApp.
Limited‑time offer: Free engineering sample (up to 5 pcs) for orders placed before May 31 2026. No risk, no obligation.
Mark Davis, Senior Engineer, PowerCo (USA) – “The ei 57x30 units arrived in 6 days, fully tested, and integrated flawlessly. We saved 18% on BOM cost.”
Sofia Alvarez, Procurement Lead, SoundWave Ltd. – “Excellent OEM service – they printed our logo and delivered a complete packaging kit. 100% on‑time.”
David Kim, CTO, MedTech Solutions – “Compliance documentation (CE, FDA) was spot‑on. No extra testing needed, which cut our certification time by 2 weeks.”
Emily Chen, Senior Application Engineer – Xinchangda Magnetic
Emily has 12 years of experience designing magnetic components for audio, medical, and renewable‑energy markets. She leads the R&D team that delivered the ei 57x30 transformer line and has authored three IEEE papers on high‑frequency transformer optimization.
