What is an air switch and how does it work?

The working principle of the automatic air switch is that when the switch is connected to the power supply, if there is no abnormal response of the electromagnetic tripper, thermal tripper and undervoltage tripper, the switch will operate normally. When the line occurs short circuit or serious overload current, the short-circuit current exceeds the instantaneous trip setting current value, and the electromagnetic tripper 6 produces sufficiently large suction, the armature 8 is sucked up and hits the lever 7, the hook 4 rotates upwards around the rotating shaft seat 5 and is disengaged from the lock 3, and the lock breaks the three auxiliary main contacts under the effect of the reaction spring 16, and cuts off the power supply. When the general overload occurs in the line, although the overload current can not make the electromagnetic tripper move, it can make the thermal element 13 produce a certain amount of heat, promote the bimetal sheet 12 to bend upwards when heated, promote the lever 7 to disengage the hook and the lock, break the main contact, and cut off the power supply.

The working process of the undervoltage tripper 11 is exactly the opposite of the electromagnetic tripper, when the line voltage is normal, the voltage tripper 11 produces enough suction, overcomes the effect of the tension spring 9 and the armature 10 is sucked, the armature is detached from the lever, and the lock and the hook can be locked, and the main contact can be closed. When the voltage on the line all disappears or the voltage drops to a certain value, the suction force of the undervoltage tripper disappears or decreases, and the armature is pulled apart by the tension spring 9 and hits the lever, and the main circuit power supply is broken. In the same way, when there is no mains voltage or the voltage is too low, the automatic air switch cannot be switched on the power supply.

The air switch is the circuit breaker, and the meson of the dynamic and static contacts is air, that is, it works in the air. There is a detailed introduction to the library about how he works.

Switches are very common in our daily lives and are electronic components that can cause an open circuit or interrupt the current. The switch can not only turn on and off the power supply, but also prevent the accident from developing into a more serious situation at the moment of an accident, and can protect the safety of people's lives and property. Today we will take a look at how the air switch works and what the air switch does.

How the air switch works.

An air switch, also known as an air circuit breaker, is a type of circuit breaker. It is a switch that automatically disconnects whenever 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 power drive system, which integrates control and a variety of protection functions.

In addition to completing the contact and breaking circuits, it can also protect the circuit or electrical equipment from short circuits, serious overloads and undervoltages, and can also be used to start the motor infrequently.

When the general overload occurs in the line, although the overload current can not make the electromagnetic tripper move, it can make the thermal element generate a certain amount of heat, promote the bimetal sheet to bend upwards when heated, push the lever to disconnect the hook and the lock, break the main contact, and cut off the power supply. When the line is short-circuited or seriously overloaded current, the short-circuit current exceeds the instantaneous trip setting current gauge value, and the electromagnetic tripper produces a large enough suction force, sucks the armature and hits the lever, so that the hook rotates upward around the shaft seat and disengages the lock, and the lock breaks the three main contacts under the action of the reaction spring and cuts off the power supply.

The tripping mechanism of the switch is a set of connecting rod devices. When the main contact is closed by the operating mechanism, it is locked in the closing position by the latch. If a fault occurs in the circuit, the relevant tripper will act to disengage the locking hook in the trip mechanism, so that the main contact is quickly disconnected by the release spring.

According to the different protection functions, the tripper can be divided into overcurrent trippers and loss-of-voltage trippers.

The role of the air switch.

Under normal conditions, the armature of the overcurrent tripper is released; In the event of a serious overload or short-circuit fault, the coil connected in series with the main circuit will generate a strong electromagnetic attraction to attract the armature down and jack the locking hook, so that the main contact is disconnected. The undervoltage tripper works on the contrary, when the voltage is normal, the electromagnetic suction pulls 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 is disconnected.

When the power supply voltage returns to normal, it must be re-closed before it can work, which realizes the loss of voltage and the protection of the trapped trap.

Through the above introduction of the working principle of the air switch and the role of the air switch, we have an understanding of the working principle and function of the air switch, I hope the introduction of the content, can help you.