23 January 2021
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 I2
t values under Class 3 for C60 range Circuit Breakers.