Power Systems Circuit Breakers Ratings of Circuit Breakers

How is the breaking capacity of the circuit breaker calculated?

1
Breaking capacity = Rated symmetrical breaking current × Rated service voltage × 2
2
Breaking capacity = Rated symmetrical breaking current × Rated service voltage
3
Breaking capacity = Rated symmetrical breaking current × Rated service voltage × √2
4
Breaking capacity = Rated symmetrical breaking current × Rated service voltage × √3
5
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