What is the opening principle
The air switch is different from the general switch, it has the function of automatically cutting off the circuit, which can effectively avoid the occurrence of safety accidents. Open space to make their own circuit is turned off is not it amazing? Next, the editor will share with you what is the air switch and what is the principle of the air switch ? Please see the introduction below.
What is open
Empty open the air switch is referred to, also known as the air circuit breaker is a circuit breaker. It is a switch that will automatically open as long as the current in the circuit exceeds the rated current. Air switch is a very important kind of electrical appliance in low-voltage power distribution network and electric drive system. In addition to being able to complete contact and break circuits, it can still protect short circuits, severe overloads, and undervoltages that occur in circuits or electrical equipment. It can also be used to start motors infrequently.
What is the open circuit principle
There is a double release in the air switch . The inverse time action is that the bimetallic piece is heated and bent to cause the tripper to act, and the instantaneous action is that the iron core street iron mechanism drives the tripper to act. There are three types of tripping methods: thermal, electromagnetic and compound tripping.
When the circuit is generally overloaded, although the overload current cannot make the electromagnetic release act, it can cause the heat element to generate a certain amount of heat, which causes the bimetal to heat up and bend, and push the lever to disengage the hook and the lock, and the main contact Head off, cut off the power. When the circuit is short-circuited or severely overloaded, the short-circuit current exceeds the instantaneous tripping setting current value, and the electromagnetic tripper generates enough suction to attract the armature and strike the lever, causing the hook to rotate upward around the shaft base and release the lock Under the action of the reaction spring, the lock will break the three pairs of main contacts and cut off the power supply.
Air switch working principle diagram
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 hook. If a fault occurs in the circuit, the related trip unit will act to disengage the lock hook in the trip mechanism, so the main contact is quickly broken under the action of the release spring. According to the different protection functions, the release can be divided into over-current release and loss-of-voltage release.
Under normal circumstances, the armature of the overcurrent release is released; once a severe overload or short-circuit fault occurs, the coil connected in series with the main circuit will generate a strong electromagnetic attraction to attract the armature downward and open the lock hook Open the main contact. The operation of the undervoltage release is just the opposite. When the voltage is normal, the electromagnetic force attracts the armature and the main contact is closed. Once the voltage drops severely or the power is cut off, the armature is released and the main contact is opened. When the power supply voltage returns to normal, it must be re-closed to work, and the voltage loss protection is achieved.
The above is a brief introduction to what is the air switch and the principle of the air switch . I hope the above information will be helpful to everyone. If you have any questions, please leave a message at the bottom of the page, we will answer you as soon as possible. Thank you for your support of this website, and related articles have been published one after another, please continue to pay attention.
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