Ultra Isolation Transformer

Even when the primary and secondary coils are separated, the differential noise can magnetically couple from the primary to the secondary of an isolation transformer. The excessive capacitance could couple AC current from the primary to the secondary.

To prevent this, an electrostatic shield (also known as Faraday Shield) is interposed between the primary and the secondary. This reduces the coupling of common-mode noise. Such isolation transformers are called Ultra Isolation Transformers or Shielded Isolation Transformers.

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