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CAGE Code: 5DME2
ITAR Registration Code: M28889

- August 26th 2019 -
Call: 1 (800) 377-3244
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4 Phase Nanocrystalline Common Mode Chokes

CWS's FPA, FPB and FPC Series of Four Phase Nanocrystalline Common Mode Choke
Four Phase Amorphous Common Mode Choke (CMC).
These 4 phase common mode chokes are wound on nanocrystalline and amorphous ribbon cores. Nanocrystalline and Amorphous ribbon cores are ideally suited for 50Hz to 500Hz line frequency common mode filtering. The cores are encased in high temperature plastic casing to provide mechanical integrity.

Application includes installation at 50Hz or 60Hz or 400Hz 4-Phase power panels for industrial equipment, machinery, 400Hz military power generator, wind turbine power generator, DC to AC inverter, UPS, etc.

The advantages of the FPA, FPB and FPC Series over the ferrite based common mode chokes are:
1) High permeability of 50,000 to 85,000 ui. This means less number of turns needed to achieve the same inductance, impedance and insertion loss providing better filtering solutions.
2)Very high inductance (L), impedance |Z| and insertion loss (-dB). Compared to ferrite CMC of the same size, the L can be over 4x higher at 10Khz and 2x higher at 100 Khz. Therefore smaller size can be used to achieve the same insertion loss.
3) High saturation flux density (Bm) of 1.2 Tesla or 12,000 Gauss. This means ability to withstand higher voltage spikes and higher transient noise and more effective in controlling AC Power Line conducted noise up to 10 Mhz.
4) High Curie Temperature of 570 deg C which allows it to operate at HIGHER temperature range.
5) Little variation in inductance and impedance from low temperature up to Curie temperature. This means ability to operate over a WIDER temperature range.
6) Little or No magnetostriction allowing low audio noise operation

Please follow this link to see some pictures of 4 Phase Nanocrystalline CMCs

  Part Number Inductance Current Rating (Amps) DCR (mOhms) SRF (MHz) Impedance (kOhms) @ SRF Price  
  FPB-763U-B12A 76.00 mH 12 27.0 0.043 22.0
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  FPC-523U-B15A 52.00 mH 15 20.0 0.070 24.0
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  FPB-423U-B25A 42.00 mH 25 13.0 0.095 16.0
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  FPB-353U-B12A 35.00 mH 12 18 6.3 2.6
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  FPC-173U-B30A 17.00 mH 30 6.5 0.286 11.0
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  FPA-143U-B30A 14.00 mH 30 10.0 0.380 10.0
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  FPC-952U-B40A 9.50 mH 40 3.5 0.564 7.0
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  CWS-CMN-12632-LL 8.00 mH 50 3.5 0.315 4.45
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  FPB-622U-B50A 6.20 mH 50 3.3 1.000 5.0
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  FPA-552U-B50A 5.50 mH 50 5.5 1.300 5.5
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  FPA-282U-B100A 2.80 mH 100 2.5 2.600 3.5
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Disclaimer: Coil Winding Specialist, Inc., its affiliates, agents, and employees acting on behalf of Coil Winding Specialist, Inc. (collectively, CWS) disclaim any and all liability for any errors, inaccuracies or incompleteness contained herein or in any other disclosure relating to any product. CWS reserves the right at any time and from time to time to make changes to design, technical specification, or construction of any product listed on this website without notice. CWS also reserves the right to discontinue or limit sale of any product or service available throughout this website on temporary or permanently basis without notice. CWS highly recommends customers not to use its products offered on this website for inappropriate use and applications. Products should be tested for its suitability by prospective customers in all possible applications and conditions. Customers using or selling CWS products for use in other than recommended applications do so entirely at their own risk and agree to fully indemnify CWS from any damages arising or resulting from such use or sale.

WARNING: This product can expose you to chemicals which is [are] known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go

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CWS 353 West Grove Ave. Orange, California 92865
Call us Toll Free: 1-800-679-3184 or 1 (800) 377-3244

Tel: (714) 279-9010, Fax: (714) 279-9482

Copyright 2008, Coil Winding Specialist, Inc
Updated July, 2013

CAGE Code: 5DME2(Registered with