Air switch works - Solutions - Huaqiang Electronic Network

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The air switch is also the circuit breaker, which is connected, disconnected and carries the rated working current in the circuit, and can be reliably protected in the event of overload, short circuit and under voltage of the line and the motor. The dynamic and static contacts and the contact rods of the circuit breaker are designed in parallel, and the dynamic repulsive force generated by the short circuit is used to disconnect the moving and static contacts, and the breaking ability is high, and the current limiting characteristic is strong.

When short circuited, the aromatic insulator around the static contact vaporizes, and the arc extinguishing action is performed, and the arcing distance is zero. The arc-extinguishing chamber of the circuit breaker adopts a metal grid structure, and the contact system has a repulsive current limiting mechanism. Therefore, the circuit breaker has a high breaking capacity and a current limiting capability.

With a double release. The inverse time action is that the bimetal is bent by heat to actuate the trip unit, and the instantaneous action is that the iron core street mechanism drives the trip unit. There are three types of tripping methods: thermal, electromagnetic and double tripping.

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.

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 Head break, cut off the power

The main contact is closed by the operating mechanism (manual or electric), and its contact system can not only turn on or off the normal working current due to the arc extinguishing device, but also quickly cut off the normal operating current in the event of a fault. The tripping current is several times higher than the fault current, so that the tripping mechanism of the electrical equipment switch in the circuit can be effectively protected. 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.

Under normal conditions, 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 street iron and open the hook. , the main contact is disconnected. 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.