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, in fact, for those who do not understand the air switch, this is a big problem in the choice of air switch . 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, then the choice of air switch is how, What is it about? Today, I will give you an inventory of the choice of air switches . I hope the following statement will help everyone.
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.
| First, the air switch introduced |
Air switches, also known as automatic switches, low-voltage circuit breakers, etc., are common circuit protectors in homes and projects. When the operating current exceeds the rated current, short circuit, voltage loss, etc., the circuit is automatically cut off for protection, except for the protection function. In addition, it can also be used in conjunction with leaky electrical appliances, measurement, electrical operation and other modular units. In low-voltage power distribution systems, it is often used as a terminal switch or branch switch, replacing the fuses and blade switches commonly used in the past.
| Second, the air switch works |
The internal structure of the air switch is the use of bi-metal thermal expansion and bending touch trigger levers, so that the circuit breaker tripped to play a role in overload protection. There will be a certain difference in time between overload protection. When a short circuit occurs, the release can be divided into over-current release units and loss-voltage release units according to the different protection functions. There are three types of tripping methods: thermal, electromagnetic and compound 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.
| Third, the choice of air switch |
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.
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.
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.
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.
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.
Editor's summary: After reading so much information on the air switch, we also have a lot of understanding of the air switch. If you want to buy an air switch at home, you must buy a product with guaranteed quality. Only the quality passes through. It will really protect the home circuit. The above is the working principle of the air switch, the introduction of the air switch selection method, hope to help friends who have this need! For more information, please continue to follow our website. Follow-up will present more exciting content!
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