How is the Accuracy Class rating of the CT calculated?


28 September 2021

Current Transformers

Power Monitoring Instrumentation

Accuracy class is used to classify how accurate current transformers can measure current without error. There are 3 accuracy classes for Schneider Electric current transformers: class 0.5, class 1, and class 3.

The accuracy class rating of the CT is based on the Max Power (VA) for the CTs
If the meter (VA) + the cable (VA) is less that Class 0.5 Max VA of the CT, the CT is class 0.5.

For documentation for Schneider Electric CT’s please check FA311758