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What is the I²t Thermal stress & peak current limitations of C60 range Circuit Breakers.

I2t classification (energy limitation) is defined by the energy limitation class and the C60 range of MCB is as per class 3. Energy limitation class 1, 2 or 3 are in accordance to the permissible I2t (let-through) value of Circuit Breakers.
 
Refer the below tables for Class 1, 2 & 3 of Breaker for different breaking capacity and different rating of Breaker. Refer the I2t values under Class 3 for C60 range Circuit Breakers.

 
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