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Three-phase autotransformers are often used as step-up or step-down transformers for higher power installations that do not require galvanic isolation.
Important reminder: The essential characteristic that distinguishes them from transformers is the absence of galvanic isolation between the input and output of the autotransformer. However, it is a reliable and cost-effective solution for adjusting a voltage, even at high power and current levels. They can also provide a way to create a neutral point at lower cost when required. Please keep in mind, however, that they are not isolating, and therefore cannot be used to change the neutral earthing system.
Depending on the environment where the three-phase autotransformer will be installed, the appropriate protection rating must be selected. If the autotransformer is installed in a secure cabinet, an IP00 (bare) protection rating is sufficient, and no enclosure is required. 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.
This three-phase 230V to 400V autotransformer is ideal for converting 230V three-phase voltage to 400V three-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 […]
This three-phase 400V to 230V autotransformer is ideal for converting 400V three-phase voltage to 230V three-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 […]
This autotransformer, also known as a "neutral point creator", is a three-phase 400V to 400V autotransformer that does not change the voltage value and is non-isolating by definition. It has one sole purpose: it allows, at a reduced cost, the creation of a neutral point in an installation that […]
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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