---- November 28th 2023 ----

CAGE Code: 5DME2
ITAR Registration Code: M28889
Call: 1 (800) 377-3244
Monday to Friday 8 A.M. - 5 P.M. (Pacific Time)
E-mail questions and requirements to: sales@coilws.com

Pricing is subject to change depending on product availability and backorders.
*Please Note: Items without price are listed for CWS' capability purposes.


PT SERIES : Tape Wound Toroidal Power Transformers
110 Vac, 220 Vac, 240 Vac, etc. 50/60 Hz Input

  • 10 VA to 750 VA Power Levels
  • Low Magnetic Noise
  • Meets UL, CSA, VDE Requirements
  • Hi Pot: 4000 Vrms
  • Di-electrics breakdown: 3000V, 1 Min


Click the button to see examples of our custom wound products. We wind anything to meet your needs.
Schematics and Dimensions
Description of Part Numbers and Ordering Information

1) No tooling or set up fees required for standard parts
2) Minimum order : 5 to 10 pieces. Samples available for large OEMs
3) Typical Delivery: 4 to 8 weeks



Click here to see construction details

PDF Drawing

Part Numbering

PT - AAA - BBB - C - DD

PT : Power Transformer
AAA : Primary Input Voltage
(Either 110, 220, etc)
BBB : VA Rating
C : Number of secondary
DD : Secondary Voltage


1) The prices shown below are for low volume quantity. Please call  800-377-3244 or
email sales@coilws.com for larger volume OEM pricing.

2) Our large OEM pricing is extremely competitive. We will meet or beat any competitors prices with better deliveries

3) Custom designs are available to meet any of your requirements. Please contact us

4) Stock Quantity shown below are available for immediate shipments, but are subject to prior sales. Please e-mail to re-confirm stock .

Toroidal Power Transformers are made with tape wound cores. The tape wound cores provide an almost perfect magnetic circuits to minimize losses, fringing, leakage, distortion, and provide good magnetic shielding. It also decreases the magnetization force required to produce a given flux density. It is much more efficient than E-type lamination cores, but will have somewhat higher cost as the windings need to be done on the core itself, rather than on a bobbin. The tape material is made of insulated, high permeability silicon iron, with a typical thickness of 4 mils ( 0.004"). Other materials types such as 50% nickel iron alloy, Molybdenum permalloy or supermendor are also available with increased cost.

Coil Winding Specialist (CWS) has designed a series of low cost standard tape wound transformers as shown in the table "Toroidal Power Transformer - How to order ". All these transformers are designed to meet all international safety requirements ( UL, CSA, TUV, etc). Customer can order these standard transformers in small quantities for testing and prototyping.

Please click on the link below to view the complete specifications and standard off the shelf parts and ordering infromation.




  • 10VA to 750VA Power levels
  • Low magnetic noise
  • Very low no load losses and magnetizing current
  • High Efficiency due to the toroidal structure
  • Excellent Load Regulation
  • Meets UL, CSA, VDE Requirements
  • Hi-Pot: 4000 Vrms
  • Dielectric breakdown: Over 3000V, 1 min between primary and secondary
  • Insulation System: Class B, 130°C
  • Easy installation or assembly
  • Available with various input voltages: 100V, 110V, 117V, 120V, 220V, 230V, 240V. All in 50 - 400Hz
  • Standard with single primary winding. Dual primary is available as an option
  • 100% factory tested for all parameters
  • Mounting hardware accessory options are
    available upon request.
    • Mounting Hardwares include :-
          Metal washer
          Silicone rubber pads
          Plastic washer (UL-94V0)

    If none of the standardized transformers listed in the following table can meet your needs, we can provide custom design to meet your specific needs with a minimal NRE charge.


Toroidal Power Transformers - How to order


There are no products to list in this category.

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 towww.P65Warnings.ca.gov.

Any Comments, Suggestions or Questions? Contact us!
Email: sales@coilws.com
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 www.ccr.gov)