When the Low Voltage Circuit Breaker, it should be noted:

(1) low voltage circuit breaker of the rated voltage and the rated voltage of the undervoltage release is not less than the rated line voltage; rated current

(2) of the circuit breaker and overcurrent release It not less than rated current route calculation load current; ultimate breaking capacity

(3) of the circuit breaker is not less than the maximum short-circuit current line; current setting

(4) the instantaneous low voltage circuit breaker (or a short delay) the overcurrent release end of the single-phase should be less than 2/3 of the short-circuit current and the like.