About the arc and Let’s first get to know the arc

Let’s first get to know the arc:

This is the arc, and we see that the arc is a hot gas. Inside the arc, the temperature is as high as 3,000 degrees or more, and electrons will escape from the atoms to form negative ions, which are lost, so that all the air molecules become plasma, that is, a mixture of electrons and positive ions.

Circuit breaker opening distance:

We call the shortest distance between the moving contact and the static contact at this time called the open distance.

The purpose of the open distance is to ensure that the air between the moving and stationary contacts in the open state does not cause electrical breakdown.