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Custom Transformers

Let us design a transformer to fit your needs.

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Panels & Harnesses

Value-Added Capabilities to better serve you.

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Standard Transformers

Shop our Standard Design Toroidal Transformers.

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Transformer Kits

The many advantages of custom designed toroidal transformers are now available to you in small quantities with little investment required.

When our standard transformers are not suitable or when exact output data cannot easily be established, you now have a less expensive alternative to a full custom design. Toroid Corporation offers kits with factory made primaries, available in five power ratings and come with complete instructions. All kits are made for 60 Hz operation.


Each kit contains:
  • A toroidal core of grain oriented steel
  • Mylar taped for insulation of secondary windings put on by the customer
  • Built-in thermal fuse rated at 130C
  • Manual with step-by-step instructions on how to design and wind the secondary windings.
  • Metal washer and 2 rubber pads for mounting the transformer
  • Guide to calculate proper wire size and length required to generate your calculated output data.

Data and Price

Order Part No. Rated VA (1) Rated DC (2) Primary Voltage Volts/Turn Size Price
Price 401.008 80VA 60W 117V .13 3.4" x 1.6" $58.55
Price 401.020 200VA 140W 117V .23 4.2" x 2.0" $71.90
Price 401.040 400VA 260W 117V .44 4.7" x 2.5" $80.45
Price 402.070 700VA 460W 117V .44 5.8" x 2.8" $93.47
Price 402.140 1400VA 880W 117V .72 6.6" x 3.1" $126.62

(1) Calculate Volts x Amps (RMS) for each winding. The SUM of these VA-ratings must be smaller than the rated VA for the kit to be chosen.
(2) Rated DC power replaces the VA rating if the transformer is used to supply rectifiers with capacitor filters as loads. Calculate PDC = (DC Volts + 2) x DC Amps for each bridge rectifier supplied by the transformer. The SUM of the PDCs for all rectifiers must be smaller than the Rated DC Power for the transformer. If any rectifier uses two diodes and a center tapped secondary instead of a regular bridge conversion, its PDC is: 1.4 x (DC Volt + 1) x DC Amps. The kit does not include magnet wire for the secondary windings. (Available from motor repair shops)

The price for the kit (please see chart) does not include engineering assistance to calculate wire size and length. Should you like us to do this work for you, we would be happy to help you for a fixed fee of $175.00 per design. Required magnet wire would then be shipped with the transformer kit from the factory at no extra charge.

Terms and Conditions

  • For larger quantity prices, please contact the factory directly.
  • Prices and data subject to change without prior notice
  • Delivery: Small quantities of standards are normally available from stock
  • 30-Day Return Policy of Undamaged Items - 15% Restocking Fee on Standard Transformers
  • 36 Month Product Warranty
  • Terms and Conditions