Reason for tripping of distribution box:

1. Check if the air switch is damaged.

2. Check if the air switch wiring is correct. Incorrect and rewire.

3. Check the insulation of the circuit on the load side of the air switch. If there is a short circuit and grounding, it is necessary to eliminate the problem before closing it normally.

If it trips as soon as power is transmitted, it indicates that the circuit is short circuited to ground.

A netizen asked if the reason for the main switch always jumping at home could not be found. According to his description, it should be that the zero line of a certain sub circuit is grounded.

Based on the description of netizens and photos of his distribution box, it was found that his circuit breaker was a 1P micro circuit breaker. The breaker only disconnected the front, and the neutral line was still connected. Regardless of which circuit had no faults, electricity would pass through the neutral line of the faulty circuit and go underground. Therefore, the main circuit breaker leakage circuit breaker will still trip. When checking, disconnect one output line slightly each time and remove the zero wire of this circuit, then check in sequence to see which branch has the problem.

If the problem lies in the neutral wire of No. 3, even if you disconnect the neutral wire of No. 3, other 1, 2, and 4 will still pass through the ground of the neutral wire of No. 3. Only by removing the main switch of the neutral wire 3 and preventing leakage can the fault be identified as being in the neutral wire 3.

If the main switch of the home distribution box is to choose a branch with leakage, it is recommended to use a 2P micro break, as shown in the figure below, which is more convenient for maintenance. In case there is a leakage problem that breaks the faulty branch, the other branches can still use electricity normally and wait for the master to repair.

After the introduction by the editor above, I believe that everyone has a certain understanding of the air switch of the distribution box and has mastered some relevant common sense

Article source: Jiangmen distribution box www.gdsandingdianqi.com