How to correctly select a low-voltage circuit breaker?

The following is a detailed analysis!

(1) The rated current of the circuit breaker is determined by the calculated current of the line.

(2) The shortcircuit setting current of the circuit breaker should avoid the normal working starting current of the line.

(3) Verify the breaking capacity of the lowvoltage circuit breaker according to the shortcircuit current of the line.

(4) Verify the sensitivity of the circuit breaker's action according to the short-circuit current of the line, that is, the shortcircuit current of the line should be no less than 1.3 times the short-circuit setting current of the circuit breaker.