Toroidal core transformer

REO toroidal transformers for the efficient reduction of energy and costs

The amount of energy consumed is significantly reduced by using an REO toroidal transformer. In a comparison between a traditional transformer and a toroidal transformer, the losses can be reduced by up to 40%.

REO toroidal transformers possess a low magnetic stray field and very low intrinsic losses. They can achieve a reduction in weight of up to 50% as a result of their special construction.
For use in aggressive environments, the toroidal transformers are equipped with a special full-bonded grouting.
With the use of UL-listed materials and various DIN-compliant fastening connections, you will fulfil the very highest quality standards.

  • RFT-HiFi

    Toroidal fixed transformers, Audio transducer

    RFT-HiFi
    • Nominal load impedance 100/70V: 20-80/10-39,98 Ω
    • Input impedance: 4 Ω

    No hum of REO-Transformers


    For audio applications, it is particularly important that the transformers work noiseless work and the hum of the transformer is reduced to a minimum. An optimized design of the windings per volt reduces annoying buzzing sounds. This adjustement ensures a small THD and a pure sound.


    Furthermore, the use of an toroidal tapewound cores avoids the vibration of the transformer core. An additional vacuum impregnation of the windings and the lack of air gaps eliminate the typical humming noise of transformers almost completely.


    Small space requirement and less weight


    Toroidal audio transformers have significant advantages compared to conventional transformers: Their design results in a very small volume and light weight. Like that, the transformer has small dimensions and at the same time high levels of efficiency.


    Minimum stray field


    Between no-load and full load, the change of the secondary voltage is many times smaller than in transformers with nested core. 


    In audio appications it is important to keep the stray field as low as possible, so that the other housing parts are not animated to oscillate, which can lead to more disturbing noises.


    RFT HiFi: 


    Broadband audio transformer for adjustment of low-amplifier outputs (Nominal impedance 4 Ohm)  at outputs with 70/100-V-constant voltage for professional use; low stray field toroidaö core transformer.



    • Power transfer up to 500 W at 70/100 V constant voltage

    • THD 0,04…0,09

    • Frequency range  40…18 000 Hz

    • High electrical safety due to galvanically isolated windings

  • RFT-MV

    Toroidal fixed transformers, with sealed center hole

    RFT-MV
    • Rated power: 10 - 6000 VA
    • Input voltage: 230 V

    Toroidal transformer with sealed centre hole used as mains transformer, autotransformer, safety isolating transformer, isolating transformer. 


    The toroidal transformers with sealed centre hole or sealed socket have the same advantages as the open transformers, however they also provide a good mounting solution for the transformer. This allows faster time and lower cost mounting as only a central stud is required. A safe distance from the mounting surface is ensured.



    • Conform to: EN 61558-2-6, EN 61558-2-4, EN 61558-2-1

    • Maximum production : up to 6 kVA

    • Voltages: 24 up to max. 690V

    • Frequency range: 50-400Hz

    • Rated currents: up to 50 A

    • Temperature class: T40/E und T40/B


    Special voltages and higher capacities on request

  • RFT-O

    Toroidal fixed transformers, open design (IP 00)

    RFT-O
    • Rated power: 10 - 6000 VA
    • Input voltage: 230 V

    Toroidal transformers are particularly used when a compact yet robust power supply is required. REO transformers are used in the entire sector of electronics and electro technology and have, in addition to the small dimensions, significant advantages in comparison with the standard EI transformers. 



    • Conform to: EN 61558-2-6, EN 61558-2-4, EN 61558-2-1

    • Maximum production : up to 6 kVA

    • Voltages: 24 up to max. 690V

    • Frequency range: 50-400Hz

    • Rated currents: up to 50 A

    • Temperature class: T40/E und T40/B


    Special voltages and higher capacities on request

  • RFT-VV

    Toroidal fixed transformers, fully sealed

    RFT-VV
    • Rated power: 10 - 6000 VA
    • Input voltage: 230 V

    Toroidal transformer fully sealed as mains transformer, autotransformer, safety isolating transformer, isolating transformer. 


    All benefits of the toroidal transformer are combined in fully sealed toroidal transformers in a special plastic housing. The shape of the housing can be adapted exactly to the application. The plastic housing provides optimal mechanical protection against humidity and dust and provides in addition better heat conduction which leads to an increased power density.


    The mounting is carried out by means of a central screw and allows therefore a short mounting time.



    • Conform to: EN 61558-2-6, EN 61558-2-4, EN 61558-2-1

    • Maximum production : up to 6 kVA

    • Voltages: 24 up to max. 690V

    • Frequency range: 50-400Hz

    • Rated currents: up to 50 A

    • Temperature class: T40/E und T40/B


    Special voltages and higher capacities on request

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