Circuit breakers rated short circuit breaking capacity

In the civil design is mainly used for low-voltage circuit breaker overload, short circuit, over current, loss of voltage, grounding, leakage, dual power automatic switching and infrequent start  Electric energy meter, operation and other purposes, the choice of in addition to compliance with the principle of the use of low-voltage electrical equipment and other basic principles of Voltage stabilizer characteristics (see the distribution of industrial and civil design manual) still should be considered in addition the following conditions:
A) not less than the rated voltage of the circuit breaker rated voltage lines;
2) Rated current breaker with o mcb circuit breaker device is not less than the rated current of the line to calculate the current;
3) circuit breakers rated short-circuit breaking capacity not less than the maximum short-circuit current;
4) Select the type of distribution to be considered a short delay circuit breaker breaking capacity and delay protection interstage match;
5) breaker undervoltage release voltage rating equal to the rated line voltage;
6) When used for motor protection, then select the circuit breaker motor starting current to be considered at the starting time and make no action; design calculations see "industrial and civil Distribution Design Handbook";
7) breaker selection should also consider the breaker and circuit breakers, circuit breakers and fuses selective cooperation.