The air switch also becomes an air circuit breaker. The principle of the air switch is to use air as the insulating medium to turn on the current in the circuit, so that the component generates heat, which causes the inner bimetal to be bent after being subjected to heat, pushing the lever to open the locked lock and cut off the power supply. The air switch will automatically trip itself to achieve a protection current. In general, the situation of automatic tripping is due to problems such as excessive load on the circuit or short circuit. The opening of the buckle is a lever device, and the pushing of the lever can open the buckle to achieve the purpose of automatic tripping. Compared with the difference between the air switch and the leakage switch, in principle, the air switch is more complicated. What is a leakage switch Leakage switch, as its name suggests, is a kind of switch that prevents leakage and causes a safety accident. The function of the leakage switch is that there is a small chip in the center. There are two things called windings on the chip, one main and one auxiliary. The main winding is divided into two windings, namely the output and input current windings. If there is no leakage, the output current and the input current are equal, so the vector of the two fluxes on the chip is zero, and no safety accident will occur on the winding. If this principle is deviated, Then a voltage is generated on the secondary winding, pushing its built-in mechanism and finally tripping automatically. In principle, this is one of the differences between air switches and earth leakage switches. When an air switch has a leakage protection function, it is called a leakage protection switch. If it is an electrical device for leakage protection alone, it is called a leakage protector. The principle of determining whether the leakage is caused is that the current flowing into and out of the switch must be equal, otherwise it is determined to be leakage. When the leakage current reaches and exceeds a certain level, a protective action occurs---tripping. The threshold of the decision is configurable because the circuit is designed by us. Only when applying, depending on the occasion, choose a protector with different sensitivity. If it is used for personal safety protection, the leakage current is less than 30mA, which is considered safe. If it is greater than 30mA, it is considered unsafe and will cause protection action. Leakage protection rated leakage current of 30mA leakage protection or protection switch, belonging to the same sensitivity leakage protector or protection switch. The production protection action time should also be within 0.1 seconds. The main basis for the selection of these two parameters is: 30mA: The human body's perceptual current ----- male 1.1mA female is 0.7mA; the current male is 16mA female is 10.5mA, the child is smaller than the adult; the life-threatening current in a short time is the current, from two Aspects of understanding - first, the current reaches 50mA will cause ventricular fibrillation, life-threatening, and the current above 100mA will be fatal to the center, 30mA or less will not be life-threatening. 0.1 seconds: The human heart has a 0.1 second pause every time it contracts, and within 0.1 seconds, the heart is most sensitive to current. If the current passes through the heart at this moment, even if the current is small, it will cause the heart to vibrate, posing a danger. However, it must be noted that the usual leakage protection switch or leakage protector is only suitable for power frequency power supply. It is not applicable to other power sources, such as DC power supply and high frequency power supply. The difference between open and leak switches In addition to the two principles mentioned above, it is one of the differences between the air switch and the leakage switch, and the only difference is that the two are also different in terms of protection. The air switch is generally used for a long time to prevent the circuit from being over-loaded. In order to prevent the human body from getting an electric shock, it only acts as a fuse. The leakage switch prevents the human body from being shocked and leaked, and does not play a big role in over-loading the circuit. Because the two work different principles, the resulting security protection is also different, so the two are not blindly mixed. Next, the second difference between the air switch and the leakage switch is that the motion detection method is different. The safety switch is pure because the circuit is over-balanced to trip to protect the safety of the electricity; the leakage switch detects the residual current, which is the algebraic sum of the protection circuit current neutral and the internal phase line. Therefore, the residual current device It only needs to avoid the leakage value, and it is very sensitive to cut off the leakage switch to prevent direct contact with the leakage current. So in this way of detecting motion, this is the biggest difference between the two. In addition, there are many differences between air switches and leakage switches. For example, in terms of protection, the air switch only protects against the current of the large circuit, mainly detecting the short circuit in the line and carrying the excessive current, and the leakage switch is relative to the protection of the small circuit. Line equipment, protection of human body safety and equipment safety; in the case of tripping, the safety switch is through the live line and the neutral line. If the current between the two lines is too large, it will cause a trip, and the leakage switch is only because of the fire line, the human body will contact the fire line and The ground forms a loop, which causes the device inside to automatically feel the touch, achieve the purpose of tripping, and play a protective role. Mini PC Office
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What is an air switch