(1) improper installation.The lead wires of each pile head are not connected firmly and loose for a long time, which will cause the pile head to heat up, oxidize, burn the insulation outside the wire, and send out sparks and coke smell, resulting in the circuit voltage, air switch action.

(2) leakage switch itself quality problem.

(3) mismatch with load.The actual electrical load of the home is greater than the rated current of the low-voltage circuit breaker on the line.Happen to be installed in new commonly or add after high power home appliance such as water heater of air conditioning, report.Matching air switches must be replaced.

(4) electrical or circuit leakage, short circuit.Find the use of electrical leakage, as long as there are leakage fault electrical plug, re-close the low-voltage circuit breaker can send electricity.

After the low-voltage circuit breaker breaks, first disconnect all the branches and then close them one by one to send electricity.When a road closed, low-voltage circuit breaker can not send power, is the branch has a fault, should disconnect this road, close the other branch to send power.After finding out the fault branch problem, after the repair before power.

(5) the supply line voltage is too high.This is very dangerous, generally occurs in the "three - phase four - wire" power supply of residential buildings.At this point, see if the two wires are live;Second to see if the right and left neighbors also trip;Measuring incoming voltage with multimeter.Do not force on the low-voltage circuit breaker, otherwise light will burn out the electrical appliances, heavy will cause a fire.