How to select a Current Transformer
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Our complete guide on choosing the right current transformer for the job
Transformation ratio
The transformation ratio is the relationship between the primary rated current and the secondary rated current, and is cited on the rating plate as an unsimplified fraction.
Most frequently, x / 5 A current transformers are used. The majority of measuring devices have the highest precision class at 5 A. For technical and moreover economic reasons, x / 1 A current transformers are recommended with long measuring cable lengths. The line losses with 1-A transformers is only 4 % in comparison to 5-A transformers. However, the measuring devices here frequently exhibit a lower accuracy of measurement.
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