The household electric bus switches we often see include air switches and knife switches . Knife switches are not common in urban households, but are still very common in rural homes. However, in recent years, the knife switch has gradually decreased, and it has gradually been replaced by an air switch. Both switches have their own advantages, so what should be used when selecting switches?
Knife switch external structure
Knife switch internal structure
The above switch is a commonly used knife switch in the home. In addition to the separation function, it also has an over-current fuse (sheet). This switch has been used by most families because of its simplicity and low price. .
air switch
The air switch is also called an air circuit breaker , and is also a kind of switch. However, this type of switch has the function of arc extinguishing in addition to the separate circuit of the knife switch and the function of over-current fuse. What is arc extinguishing? Arc extinguishing is to extinguish the arc. The arc is the spark we see when we close or open the switch. The spark is a relatively light discharge in the arc. Because of its arc-extinguishing function, this air switch does not see an electric spark when the switch is closed or opened, so its safety is better than the knife switch.
So is it a knife switch or an air switch? This is going to be divided into situations.
First, the knife switch and the air switch each have advantages and disadvantages:
Comparison of the advantages and disadvantages of knife switch and air switch
So, which switch to use depends on which effect you want. If you want to be able to see the obvious circuit break point (you can clearly see that the break point is more assured), use the knife switch. After all, the air switch will not see the break point after disconnection. As for the break, it will be closed. Whether the air switch is in a normal state; if you want a higher safety and can extinguish the arc, then choose the air switch, which is not bad for a few dollars anyway.
Everything has its own advantages and disadvantages. It is best to choose the best and rest assured.
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