The open circuit breaker, which is what we usually call the air switch circuit breaker, can play a role in safety assurance, so it is widely used in real life. And for the user is also a good, trustworthy and purchased parts. So the knowledge that is popular for everyone today is about the working principle of the open circuit breaker.
First, the introduction of open circuit breaker
Air-open circuit breaker air switch, also known as air circuit breaker, is a type of circuit breaker. It is a switch that automatically turns off as long as 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 electric drive system. It combines control and multiple protection functions. In addition to the ability to complete contact and disconnect circuits, it can also protect against short circuits, severe overloads and undervoltages in circuits or electrical equipment, and can also be used to start the motor infrequently.
Under normal circumstances, the armature of the overcurrent release is released; in the event of a severe overload or short circuit fault, the coil in series with the main circuit will generate a strong electromagnetic attraction to attract the armature downward and open the lock hook. Disconnect the main contact. The operation of the undervoltage release is exactly the opposite. When the voltage is normal, the electromagnetic attraction attracts the armature and the main contact is closed. Once the voltage is severely dropped or powered down, the armature is released and the main contact is opened. When the power supply voltage returns to normal, it must be re-closed before it can work, achieving voltage loss protection.
Second, the working principle
There are three types of tripping methods: thermal, electromagnetic and double tripping.
When the line is generally overloaded, the overload current can not make the electromagnetic release action, but can cause the heat element to generate a certain amount of heat, causing the bimetal to be bent upwards by heating, pushing the lever to disengage the hook from the lock, and the main touch The head is broken and the power is turned off. When the line is short-circuited or severely overloaded, the short-circuit current exceeds the instantaneous trip setting current value, and the electromagnetic tripper generates a sufficient suction force to attract the armature to the impact lever, causing the hook to rotate upwardly around the rotating shaft seat and disengage the lock. The lock buckles the three main contacts under the action of the reaction force spring to cut off the power.
The trip 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 lock hook in the closed position. If a fault occurs in the circuit, the relevant trip unit will act to disengage the lock hook in the trip mechanism, so that the main contact is quickly broken by the release spring. According to the different protection effects, the trip unit can be divided into an overcurrent release and a voltage loss release.
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