# Current Transformer Ratio

**Definition:** 1) The ratio of primary amps divided by secondary amps. 2) The current ratio provided by the windings of the CT. For example, a CT that is rated to carry 200 Amps in the primary and 5 Amps in the secondary, would have a CT ratio of 200 to 5 or 40:1.

## Related Links

Current Transformer Basics and the Current Transformer

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Current transformer – Wikipedia

Current Transformer Basics: Understanding Ratio, Polarity, and Class

Blog – CT Primary & Secondary Turns Explained!

How to Calculate CT Ratio | Sciencing

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