Single-phase autotransformers

Single-phase autotransformers are typically used for low or moderate power installations or inside electrical cabinets. They can be either step-down or step-up transformers.

Reminder: the essential characteristic that distinguishes them from transformers is the absence of galvanic isolation between the input and output of the autotransformer. It is a reliable and cost-effective solution for adjusting the value of a single-phase voltage. The most common single-phase voltages today are 230V, 400V or 24V in professional environments.

Depending on the environment where the single-phase autotransformer will be installed, the appropriate protection rating must be selected. If the autotransformer is installed in a secure cabinet, an IP00 protection rating (bare) is sufficient — an enclosure is unnecessary. In a technical room, a minimum IP21 protective enclosure is required to protect people. In environments subject to water splashes, a higher protection rating such as IP54 should be considered.

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Autotransformer Single-phase 400V / 230V

Autotransformer Single-phase 400V / 230V

Low-voltage

This single-phase 400V to 230V autotransformer is ideal for converting a 400 Volt single-phase voltage to 230 Volt single-phase when the latter is unavailable in an installation. The advantage of the autotransformer lies in its cost and reduced size compared to an isolation transformer. However, note that to use an autotransformer, galvanic isolation […]

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Single-phase autotransformers

Single-phase autotransformers – custom-made

Specific voltages, particular power ratings, low or high frequency, special integration conditions or configurations: if your project does not match a standard reference, our teams will support you in designing a custom autotransformer.

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Thanks to our France-based production, we can easily adapt to your constraints. We can customise our single-phase autotransformers in power rating and voltages as you require, and manufacture them within a few days or weeks depending on the power rating. All voltages below 1,000 Volts are readily achievable. We can also modify our products for higher frequencies or specific dimensional requirements.

Please note that all our low voltage autotransformers are systematically vacuum and pressure impregnated with tropicalised resin. This technique is a mark of quality that fewer and fewer companies take the time to implement.

Otherwise, as with most of our products — whether autotransformers or transformers — almost all options are available. They can be equipped with electrical protection, such as circuit breakers mounted in an external enclosure, switch-operated isolators, or fuses. Adjustable IP protection (Bare: IP00, Indoor: IP21, IP23, IP33, Weatherproof: IP54) – Silent blocks – Rollers or casters – Pre-wired connection cables – PVC or brass cable glands – Hypra socket – RAL colour customisation

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