Magnetic core since 1995

Core Professional, Core International


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Trade Mark
HSD-, BSD-, HWE-, S3U-series; Customized dimensions also welcome.
Delivery time
Samples: 9~12 days; Batches: 9~30 days accordingly.
Payment term
TT or L/C


High quality CRGO steels with low iron-loss and high permeability in thickness of 0.05mm, 0.08mm, 0.1mm, 0.23mm, 0.27mm, 0.3mm and 0.35mm.


The two halves of three phases put together and come into a closed flux path as an open structure. So bobbin and core can be produced separately, afterward put the core in bobbin, and then the production time can be reduced.


Various specifications E core are widely used in 50Hz and 400Hz three phases transformers, reactors, chokes and other magnetic components of electronic equipment.

Specifications of standards E-Cores



Babette Shoemaker

Good morning, I have a student working on a project that requires 3 pairs of E-cores. Could you please provide a price quote. Thank you, Mrs. Shoemaker
2016-11-16 21:25:56

Alan Bridewell

We need to purchase E cores for a 3phase transformer,rated 200kVa @1kHz. primary Voltage 245V rms.,secondary Voltage 375V rms. We would like your opinion as to your most suitable matl. and dimensioned drawing so we can design our windings
2016-10-10 00:36:05


Dear Alan, we have some standard sizes for the E-cores like S3U series and british HWE series. I will send you the catalogue for your further checking. Thanks and best regards, Johnny Zhou
2017-05-02 15:21:33

mehdi alemi

hello I am mehdi alemi rostami and working in Aerospace Research Institute. I have PHD in power electronic and research and implementation power converter and drive. I would like to know your products specially cores. I need some information about these(400hz and 20khz) . best regard
2016-09-27 19:30:38


Dear Mehdi Alemi, please contact me by email ( for more details. We have the Ultra-thin gauge silicon steels, which is special designed for 400 Hz application, and Nanocrystalline material for 20kHz. Best regards, Johnny Zhou
2017-05-02 15:21:40

Humberto Fabbri

Hi. I need to purchase E Cores for a 400 Hz transformer. I suppose I will need 0,1 mm steel. Can you please send me technical data on your 0,1 mm Steel? Can you send me a drawing with letters on the dimensions so I can easily send you the dimensions I will need? Also minimum quantity and such commercial information. I am located in São Paulo Brazil. Thanks.
2016-04-19 04:47:28
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