Air switches, also known as air circuit breakers, are a type of circuit breaker. It is a switch that automatically turns off when 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 electric drive system. It integrates control and various protection functions. In addition to being able to complete the contact and breaking circuit, it can still protect the circuit or electrical equipment from short circuit, severe overload and under voltage, etc., and can also be used to start the motor infrequently.
When the line is generally overloaded, the overload current can not cause the electromagnetic release to act, but it can make the heat element generate certain heat, promote the bimetal to be heated upwards, push the lever to release the hook and the buckle, and the main touch Head broken, cut off the power. When a short circuit or severe overload current occurs on the line, the short-circuit current exceeds the instantaneous tripping setting current value, and the electromagnetic release device generates a sufficient suction force to suck the armature and strike the lever, so that the hook moves upwards and rotates the lock seat away from the lock. , The latch will break the three main contacts under the action of the reaction force spring and cut off the power.
The tripping 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 locking hook at the closing position. If a fault occurs in the circuit, the relevant trip unit will act to disengage the latch hook in the trip mechanism, and the main contact breaks quickly under the action of the release spring. In accordance with the different protection, the release can be divided into over-current release and loss of pressure release and other types.
How to install the air switchThe commonly used air switches are 1P, 2P, 3P, and 4P, depending on your power supply mode.
1P is what you call the single line, in fact it means single phase, can only protect a FireWire, suitable for lighting or low-power 220V electrical appliances;
2P is used for the wiring of a fire and zero, generally uses the 220V electric motor and so on;
3P is used for the wiring of three fire wires, that is, the wiring of 380V, generally used for 380V electrical appliances;
4P is used for the wiring of three fires and zeros, usually used for 380V appliances with zero line, and of course it can also be used as a master switch;
As for the installation method, it is not necessary to use a regular distribution box. As long as the air switch can be fixed, the air switch shop generally has a card slot for fixing the air switch and can be purchased together. The easiest way is to fix the card slot on the board or wall, and then install the air switch on the card slot.
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