What is the thermal withstand of a cable ?
The thermal withstand of a cable can be determined by comparing the maximum energy at the fault, with the maximum energy the cable can absorb. The equation for this is:
I^2*t = k^2*A^2
"I^2*t" is proportional to the energy let-through of the protective device
I - fault current, A
t - fault duration, S
"k^2*A^2" is proportional to the energy withstand of the cable
k - adiabatic constant
A - cable cross-sectional area, mm2
To better understand the theory behind the above, please check The adiabatic equation.
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source : What is the thermal withstand of a cable ? (https://mycableengineering.com/knowledge-base/the-adiabatic-equation)