What is an autotransformer ?

What is a autotransformer?

An autotransformer is an electrical device that can change the voltage and intensity between the input and the output. The transformation ratio is identical between primary (input) and secondary (output) as described below:

Primary voltage x Primary current
Secondary voltage x Secondary current

However, unlike transformers, autotransformers cannot isolate two circuits. The primary and the secondary shall be electrically connected to each other. They do not have the protective role of transformers that electrically isolate the primary (input) circuit from the secondary (output) circuit.Compared to transformers, autotransformers are generally much more compact and less expensive but do not provide the same level of security exposing the output network to input network failures. With a transformer, in case of failure (overload or overvoltage) it is the latter that supports them preserving the equipment in outputs.Opting for a autotransformer is not always possible for safety reasons.


Our team is at your disposal to support you in all your projects
Please contact us for any information request.

contact us