First, the type and principle of air switch
Common air switches are divided into four types: electromagnetic trip type, thermal trip type, compound trip type (common) and no trip unit.
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.
Second, how to choose the air switch
For different places, the required air switch is actually different, but if you choose the wrong one, it will cause a lot of security risks. But everyone doesn't have to worry too much. Just knowing how to choose, you will find it simple. In fact, how to choose the air switch is a very simple matter, Xiaobian here to introduce to you! Determine its trip current. The short-circuit trip current of the air switch is selected according to the safe current carrying capacity of the wire used.
(1) Determine the purpose of the air switch. Air switches are available for both civil and industrial use. For household use, type C is required, and industrial type is selected for type D.
Example: For example, DZ47-60A C25 means: DZ47-miniature circuit breaker series; 60A-frame grade is 60A; C-civil.
If C25 is changed to D25, it is an industrial circuit breaker, such as DZ47-60A D25.
(2) Determine if the leakage protection function is required. The household entry switch is recommended to select the circuit breaker (air switch), and the next stage shunt switch selects the leakage protection air switch. It is recommended to purchase an air switch that can be disconnected with the neutral line for easy maintenance and improved safety.
Note: The air switch is used to protect the wires and prevent fires, so it should be selected according to the size of the wires, not the power of the appliances. If the air switch is too large, the wire cannot be protected. When the wire is overloaded, the air switch will not jump, which will bring hidden dangers to home safety. This is also the basis for the choice of air switch for home line design.
In practical applications, in order to protect the power supply line, the tripping current of the air to be used must be less than the maximum current allowed by the power supply line, and its rated current should be equal to or slightly larger than the maximum normal operating current of the distribution line.
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