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What is the measurement error of Tesys T relays with external CT

For 8A/27A models with external CT : the measurement’s error is 2 %*I (I≤ 2*In) -> it is 1% (Tesys T) + 1 % (external CT) 
For 100A models with external CT : the measurement’s error is 3 %*I (I≤ 2*In)  ->   it is 2% (Tesys T) + 1 % (external CT)
 
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