What is the difference between CT Class 0.2 and 0.2 S?

The difference between CT Class 0.2 and Class 0.2S pertains to their accuracy and application in metering systems, specifically in the context of current transformers (CTs).

CT Class 0.2

- Accuracy: A Class 0.2 current transformer has a basic accuracy of ±0.2% at rated conditions. This designation is typically used for standard metering applications where high accuracy is required.
- Applications: Commonly used in revenue metering and power measurement in commercial and industrial settings.

CT Class 0.2S

- Accuracy: A Class 0.2S current transformer also has an accuracy of ±0.2%, but it is designed for even more stringent performance requirements, particularly at lower current levels. The "S" indicates it is suitable for standard meter applications with potentially better performance characteristics in certain conditions.
- Additional Characteristics: Class 0.2S may have better linearity or lower error at varying load conditions, making it suitable for more precise applications, such as those requiring billing or regulatory compliance.

In summary, while both Class 0.2 and Class 0.2S CTs offer similar base accuracy, Class 0.2S is typically intended for applications that demand higher precision and performance under standard conditions, making it more suitable for critical metering applications.

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