E.F.C. manufactures single-phase autotransformers tailored to specific customer requirements. We can build custom autotransformers for standard voltages, i.e. 380V and 220V (400V and 230V) or any other voltage required by the customer, including both step-down and step-up transformers (e.g. 220/380V or 220/110V).
An autotransformer (step-up or step-down) is a transformer in which the primary and secondary windings are physically connected together. This feature means an autotransformer can be smaller than a comparably-rated transformer. On the outside, it looks similar to a normal transformer.
On the other hand, having the primary and secondary windings connected to each other means an autotransformer cannot be used where the primary circuit and the secondary circuit need to be isolated from one another.
There are also single-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 single-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 price information concerning our products.