In the modern society, electricity has become a part of our lives, and it has become the survival that we depend on. Without electricity, we have no rainbow neon. There is no gorgeous night, and today the air switch I want to talk about is the modern family. A commonly used switch is equivalent to the home switch. In fact, for people who do not understand how much the air switch is, this is a big problem in the selection of air switches. Whether you know or don't understand, knowing and knowing some simple air switch selection methods is still very useful, because the choice of air switch may involve some physics knowledge. Now I will explain how much the air switch is for everyone. , Air switch pricing and selection methods, I hope everyone in the purchase of air switch help.
Air switch is commonly used in the home safe electrical equipment, the quality of the air switch is related to the safety of electricity at home, so you need to buy a good quality air switch, air switch coil cut corners, prone to non-trip current overload Happening. According to the relevant standards, when the actual current reaches 2.55 times the rated current, the air switch needs to trip within 1 second to 60 seconds. Inferior switches often fail to trip within this time frame.
| First, the air switch introduced |
Air switches, also known as air circuit breakers, are a type of circuit breaker. It is a switch that automatically turns off when the current in the circuit exceeds the rated current. The air switch is a very important electrical appliance in the low voltage distribution network and the electric drive system. It integrates control and various protection functions. In addition to being able to complete the contact and breaking circuit, it can still protect the circuit or electrical equipment from short circuit, severe overload and under voltage, etc., and can also be used to start the motor infrequently.
| Second, the air switch works |
There are three kinds of tripping methods: thermal, electromagnetic and double tripping.
When the line is generally overloaded, the overload current can not cause the electromagnetic release to act, but it can make the heat element generate certain heat, promote the bimetal to be heated upwards, push the lever to release the hook and the buckle, and the main touch Head broken, cut off the power. When a short circuit or severe overload current occurs on the line, the short-circuit current exceeds the instantaneous tripping setting current value, and the electromagnetic release device generates a sufficient suction force to suck the armature and strike the lever, so that the hook moves upwards and rotates the lock seat away from the lock. , The latch will break the three main contacts under the action of the reaction force spring and cut off the power.
The tripping mechanism of the switch is a set of linkage devices. When the main contact is closed by the operating mechanism, it is locked by the locking hook at the closing position. If a fault occurs in the circuit, the relevant trip unit will act to disengage the latch hook in the trip mechanism, and the main contact breaks quickly under the action of the release spring. In accordance with the different protection, the release can be divided into over-current release and loss of pressure release and other types.
| Third, the main role of air switches and selection methods |
Under normal conditions, the armature of the over-current release is released; in the event of a severe overload or short-circuit fault, the coil in series with the main circuit will generate a strong electromagnetic force to attract the armature downward and unlock the hook. Disconnect the main contacts. The operation of the undervoltage release is just the opposite. When the voltage is normal, the electromagnetic attraction sucks the armature and the main contact is closed. In the event of a severe voltage drop or power failure, the armature is released and the main contact opens. When the power supply voltage returns to normal, it must be reclosed before it can work, and the loss of voltage protection is achieved.
Air switch selection method 1
In the choice of air switch, you should choose from the largest to the smallest. If the air switch is home, then only consider whether it can carry the current of the home, including the total rated current of the living room, bedroom, kitchen, and bathroom. If it is not for home use, it needs to be selected from the largest to the smallest, so as to ensure the The air switch can withstand higher currents without the possibility of current short circuits. So the first choice of the air switch I introduced was to purchase from the largest to the smallest.
Air switch selection method 2
Before purchasing the air switch, be sure to figure out your incoming switch and loop switch. The so-called incoming switch refers to the total meter downstairs to the home line, take a look at the total rated current, look at the home The maximum load current determines a minimum rated current value, and the loop switch refers to the home-installed circuit. It must start from the positive pole and return to the negative pole. The process of forming a loop is simply a power-on circuit. These two aspects are also to be used as reference for air switch selection.
Air switch selection method 3
After knowing the current of one's home, the following is the model of the air switch. According to the understanding of the Xiaobian, the air switch has the following types: DZ47, DZ10, DZ5, DZ15, and DZ20. Models where DZ5 is the smallest for the circuit rated current 50A, DZ47 for the current of 60A, and the working voltage of 240v/415v or less. This largest type of air switch is suitable for building circuits, the largest of which should belong to the four air. Switch, its rated current reaches 630A, 400v below the working voltage, can fully guarantee the safety of the circuit, but home, generally do not need to use such a large model of air switch. So the choice of air switch, in terms of model, is also needed to match.
Air switch selection method 4
The function of the air switch is to protect the safe use of electricity. In the course of excessive current, once the load does not fall, the air switch should trip automatically and achieve the purpose of tripping. Therefore, on the selection of the air switch, whether the trip can be carried according to Heavy current to achieve the purpose of tripping, this is also a knowledge of the choice of air switch, simply speaking, the existence of air switch tripping is to trip, but also a low-voltage switch device, then in a different current process The time for tripping will also be different. For example, when the rated current is twice, it should be automatically spouted after more than two seconds.
Air switch selection method 5
There are many ways to choose the air switch. If you still don't know how to select the air switch, you may want to find a professional to install it. In this way, you will not be confused by the choice of the air switch. It is also a good way. Finally, Xiao Bian talks about it here. I hope everyone will know more about the air switch, be familiar with its working principle, protect the air switch, and use electricity safely. Let your family enjoy a more comfortable, safer and more secure living space.
| Fourth, how much air switch |
The price of air switch is generally ranging from ¥30--¥200. The price is different due to different quality, different models and specifications. Air switch Under normal conditions, the armature of the over-current release is released; once a severe overload or short-circuit fault occurs, the coil in series with the main circuit will generate a strong electromagnetic force to attract the armature downward and unlock the top. Hook to break the main contacts. The operation of the undervoltage release is just the opposite. When the voltage is normal, the electromagnetic attraction sucks the armature and the main contact is closed. In the event of a severe voltage drop or power failure, the armature is released and the main contact opens. When the power supply voltage returns to normal, it must be reclosed before it can work, and the loss of voltage protection is achieved.
Editor's summary: The air switch is a very important electrical appliance in the low-voltage distribution network and the electric drive system. It integrates control and various protection functions. In addition to being able to complete contact and breaking circuits, it can still cause short circuits in circuits or electrical equipment. Severe overload and undervoltage protection are also available, and it can also be used to start the motor infrequently. The above is about how much the air switch, air switch quotes and selection methods related to the introduction, hoping to help meet the needs of friends! For more information, please continue to follow our website. Follow-up will continue to show more exciting content!
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