Three-phase autotransformer

E.F.C. manufactures and sells three-phase autotransformers with custom features tailored to the needs of each customer.

We manufacture general-purpose three-phase autotransformers, including both step-down and step-up models (e.g. 220/110V or 220/380V).

An autotransformer (step-up or step-down) is a transformer in which the primary and secondary windings are physically connected together. This features means an autotransformer can be smaller than a comparably-rated transformer.

autotrasformatore-trifase

On the other hand, having the primary and secondary windings connected means an autotransformer cannot be used where the primary circuit and the secondary circuit need to be isolated from one another.

There are also three-phase variable output autotransformers (called ‘single-phase variacs’) which are used where the supply voltage needs to be variable;  for example, to carry out equipment testing or in voltage stabilisers.

The three-phase autotransformers we supply are designed and manufactured with the following characteristics:

  • Primary voltage: as per customer specification
  • Secondary voltage: as per customer specification
  • Frequency: 50-60 Hz
  • Operating temperature: 40 °C
  • Protection class: IP00 (exposed)
  • Insulation class: F (155 °C)
  • Isolation test voltage: 5000 V

Please do not hesitate to contact us for a quote and any other product price information.

Autotrasformatore-trifase-220-380-bologna-modena
Prezzo-vendita-autotrasformatore-220-110-bologna
Collegamento-secondario-a-zig-zag-modena

Construction features

During the autotransformer design and engineering stage, we focus particular attention on achieving as compact a product as possible.

Using high-quality materials and advanced manufacturing technologies has allowed us to create particularly small autotransformers which comply fully with thermal, electrical, and regulatory requirements.

Generally speaking, all our autotransformers are produced in exposed versions (IP00 protection class – no special protection) but they can also be supplied in steel plate housings with protection class IP23 or other level of protection.

Get in touch to find out more about our products. Our specialist staff are on hand to provide you with all the information you need.

Frequenza-di-azionamento
Elevatore-di-tensione-variabile-modena
Targa-apposta-sul-prodotto

Professionalism and experience

Using high-quality materials and advanced manufacturing technologies allows us to create particularly small autotransformers which comply fully with thermal, electrical, and regulatory requirements.

Thanks to our skilled, qualified staff, ranging from engineers to service centre personnel, we can offer the utmost professionalism and experience in every stage of the autotransformer manufacture process, from the feasibility analysis through to the design and finally the production, liaising with the customer for any needs and requirements.

Get in touch to find out more about our products and ask for a quote or price information. Our specialist staff are on hand to provide you with all the information you need.