Normal installation conditions of current protection circuit breakers

A) installed in no impact vibration and no invasion of rain and snow, the wiring terminal connected power supply side and the lower wiring terminal connected to the load side, with the direction of the inclination of not more than 5 degrees.

B) pollution level is 3;

C) the main circuit of the installation category is III, not connected to the main circuit of the auxiliary circuit and control circuit, the installation category;

D) the external magnetic field in the vicinity of the installation place of the circuit breaker shall not exceed 5 times of the geomagnetic field in any direction.