# Analysis of the causes of air switch failure, 7 cases let you understand how to choose

How to judge the cause of the air switch failure? How to solve the air switch failure? Based on what principle do you choose the size of the open space? Next, we will teach you how to solve common air switch problems through several classic cases.

How to judge the cause of the air switch failure? How to solve the air switch failure? Based on what principle do you choose the size of the open space? Next, we will teach you how to solve common air switch problems through several classic cases.
1
Case playback: Mr. Wang’s home often uses high-power appliances such as Yuba, water heater, induction cooker, washing machine, range hood, etc., but the air switch at home frequently trips. In view of this situation, what kind of air switch should Mr. Wang choose?

case analysis
After analysis, it can be seen that the air switch in Mr. Wang’s house trips more frequently at night and on holidays. In this case, if the power cord is large enough, choose a 4 square copper wire, and the leakage switch can be selected as 30A (specifically Refer to the maximum current of the water heater), at the same time, note that if the leakage switch automatically trips too many times (more than 10 times a month), a larger leakage switch must be replaced. In addition, the leakage switch must be replaced even if it is working normally for more than 5 years. .
2
Case playback: The home air switch used to trip occasionally when the load was heavy, but recently it always trips around 6:30 at night, and the power load is not large. What’s causing this?

case analysis
In this case, it is very likely that the undervoltage protection is working.
The new air switch generally has four automatic protections:
2 circuit short circuit protection
3 Leakage protection
4 Undervoltage protection
Six o’clock in the evening is the peak of electricity consumption, especially when the voltage of the old house is lower than the normal value.
3
Case playback: The air circuit breaker trips after a few minutes of closing (the grounding protection under the meter), what is the reason for this?

case analysis
The wiring hole on the leakage protector has a wire post, which is not inserted into the hole. It is just next to the patch that is close to the wire post, so no matter how firm the screw is, it is still in poor contact. As long as there is a high-power electrical appliance working, it will trip!
So for a similar situation, you can follow these steps:
First check the live wire above the air switch to see if the wire posts are all in the card!
Next, calculate the size of the current to determine whether the air switch is improperly selected.
If the above reasons are ruled out, you can ask a professional to check the line!
In general, the household entry line is 4mm2, and the selection of the air switch should not be too small. The wire diameter from the main switch to the air conditioner socket is too thin, and the load of the air conditioner is too large, which will also cause tripping.
The aging of the air switch will also cause tripping.
If it still trips, you need a professional electrician to check the wiring.
4
Case playback: The factory air switch works normally during the day, but the total air switch frequently trips every morning, and it will trip again within 1 or 2 hours after it is pushed up. How to solve this? PS: In addition, the normal power consumption during the day is large, and only 1.5 air conditioners and small refrigerators are working at night.

case analysis
This problem can be solved by means of elimination.
First of all, there are several reasons for the air breaker to trip:
1. Overload 2. Electrical appliances or lines with leakage 3. Air switch mechanism is damaged.
Caused by excessive incoming line voltage.For the empty open problem, replace
First, there is a problem with the switch
Second, if it is an air switch, the line is overloaded, and if it is a leakage switch, there is a leakage in the line.
Third, you check whether the line joints or terminals are loose, and reinforce them as soon as possible. The nature of the leakage protector trip and the air switch trip is different, you should figure this out first! As you said it should be the leakage protector tripped, the load switch should not, unless someone steals your electricity. Focus on checking whether the electrical circuit or electrical equipment is leaking.

5
Case playback: The main air switch of the dormitory building is 400A, and there are 7 air switches of 100A. During the day, the electricity load is small, but the 400A air switch frequently trips, but the 100A air switch does not trip. What is the reason?

case analysis
There may be the following reasons:
1. The air switch itself is a defective product (the probability is very small)
2. Three-phase unbalance, the load is concentrated in one phase (very small probability)
3. The 400A air switch has leakage protection function, and the leakage current of the line exceeds the protection value.
4. Someone in the dormitory uses poor quality electrical appliances or power outlets
5. The switch wiring is loose, and the temperature at the joint is too high
6
Case playback: Moving to a new house, the original circuit did not move during the renovation, only the electrical appliances were replaced. The main switch frequently trips, what is the reason?

case analysis
You can replace the air switch with a new one, or it may be that the line is in poor contact.
7
Case playback: Why does the air switch frequently trip, even after replacement?

case analysis
First of all, the problem of the air switch should be ruled out. Now the household air switch is generally 36A.
Preliminary estimates are the problem of aging power lines.
First connect the incoming line of the air switch, and leave the load line unconnected, and close the switch. If it trips, it is a circuit breaker fault.
If the air switch is not adjusted, then connect the load line (unplug all sockets first). Then turn on the light and see if the empty open jumps. If it does not trip, try the sockets one by one. If there is a trip, check the corresponding line of the socket.
In addition, it is necessary to calculate the total power of the electrical appliances in the home, then divide it by 220, and select the size of the air switch according to the actual current.
PS: You need to pay attention to your entry line. If the air switch is selected to be more than 20A, the diameter of the line should be kept above 4 flat.