What are the types of switching mechanism in ATS?

What are the types of switching mechanism in ATS? 

Basically, there are two types of mechanisms that work in ATS – open transition and closed transition. Free transition means break-before-make. Before changing any power supply connection, it will first open the existing connection and then connect to another one. A close transition is a make-before-break. Before breaking any power supply connection, it will first switch to the new connection and then break the previous connection.

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