Next, we will teach you how to solve the problem through several classic cases Common air switch problems.
Case playback: The high-power electrical appliances that Mr. Wang often uses in his home are bathtub, water heater, induction cooker, washing machine, range hood, etc., but the air switch in his home frequently trips. In view of this situation, how big an air switch should Mr. Wang choose?
It can be seen from the analysis that the air switch in Mr. Wang's home trips frequently at night and on holidays. In this case, 4 square meters of copper conductor can be selected when the power line is large enough. The leakage switch can Select 30A (refer to the maximum current of the water heater for details);
At the same time, it should be noted that when the leakage switch automatically trips too many times (more than 10 times a month), the larger leakage switch must be replaced. In addition, the leakage switch must be replaced even if it works normally after being used for more than 5 years.
Case playback: In the past, when the load was heavy, the hollow switch in the house occasionally tripped, but recently it always tripped around 6:30 at night, and the power load was not large. What causes this?
In this case, it is very likely that the undervoltage protection is working.
New air switches generally have four types of automatic protection:
1 Overload protection
2 Circuit short circuit protection
3 Leakage protection
4 Undervoltage protection
At six o'clock in the evening, it was the peak of electricity consumption. The voltage of the old house was lower than the normal value, which was particularly prominent. The undervoltage protection of the air switch worked.
Case playback: What is the reason why the air switch trips after closing for a few minutes (grounding protection under the meter)?
There is a wiring post in the wiring hole above the leakage protector, which is not inserted in the hole. The patch is just close to the wire post, so the screw is still in poor contact even if it is firm enough. As long as there is a high-power electrical appliance working, it will trip!
Therefore, for similar situations, the following steps can be followed:
First, check the live wire on the air switch to see if the wire posts are in the card!
Secondly, calculate the current to determine whether the air switch is improperly selected.
If the above reasons are eliminated, you can ask professionals to check the circuit!
The incoming line of ordinary families is 4mm2, and the selection of air switch should not be too small. The wire diameter from the main switch to the air conditioner socket is too small, and the air conditioner load is too large, which will also cause tripping.
The aging of air switch will also cause tripping. If it still trips, a professional electrician should check the circuit.
Case playback: The factory air switch works normally in the daytime, but the total air switch frequently trips every morning, and then trips again within 1 or 2 hours after being pushed. How to solve this problem?
PS: In addition, the normal power consumption in the daytime is large, and only 1.5 air conditioners and small refrigerators are working at night.
This problem can be solved by using the exclusion method.
First, there are several reasons for the air switch tripping: 1. Overload 2. Electric appliance or circuit with electric leakage 3. Air switch mechanism is damaged.
The external incoming line voltage is too high. If it is an air switch problem, replace it;
First, the switch is faulty;
Second, if it is an air switch, the circuit is overloaded. If it is a leakage switch, the circuit has leakage;
Third, you should check whether the line connector or terminal is loose, and reinforce it as soon as possible. The nature of leakage protector tripping is different from that of air switch tripping. You should make this clear first! As you said, the leakage protector should trip, and the load switch should not, unless someone steals your electricity. Focus on checking whether the electrical circuit or electrical equipment leaks electricity.
Case playback: The main air switch of the dormitory building is 400A, with seven 100A air switches. In the daytime, the power load is small, but the 400A air switch frequently trips, while the 100A air switch does not trip. What's the reason?
There may be the following reasons:
1. The air switch itself is a defective product (extremely unlikely)
2. The three-phase is unbalanced, and the load is concentrated in a certain phase (extremely low probability)
3. 400A air switch has leakage protection function, and the line leakage current exceeds the protection value.
4. Someone in the dormitory uses poor quality electrical appliances or plugs
5. The switch wiring is loose, and the temperature at the connector is too high
Case playback: When I moved to a new house, the original circuit did not change, only the electrical appliances were replaced. It always trips frequently. What's the reason?
The air switch can be replaced with a new one, or the circuit may have poor contact.
Case playback: Why does the air switch trip frequently after replacement?
First of all, the problem of air switch should be eliminated. Now, 36A air switch is generally selected for household use.
It is estimated that the problem is the aging of power lines.
Connect the incoming line of the air switch first, and switch on if the load line is not connected. If it trips, it is an air switch fault. If the air switch is not adjusted, connect the load line (unplug all sockets first). Then turn on the light and see if the air switch jumps. If not, try the sockets one by one. If there is tripping, check the corresponding circuit of the socket.
In addition, calculate the total power of the home appliances, divide by 220, and select the size of the air switch according to the actual current.
PS: Pay attention to your incoming line. If the air switch is selected to be above 20A, the line diameter should be kept above 4.
