The difference between air switch and leakage switch

Difference one

Working principle is different. 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.

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.

Difference two

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.

Difference three

The way motion is detected 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.

Difference four

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. The leakage switch is relative to the protection of the small circuit, and the main detection line equipment To protect the safety of the human body and the safety of the equipment; 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, the trip will be caused, and the leakage switch will only be formed by the fire line, and the human body will form a line with the ground. A loop, so that the device inside will automatically feel, to achieve the purpose of tripping, play a protective role.