on off switch


I have done a circuit in Psim (simulator) when I added a mosfet, they ask to add an on-off switch controller cause one of the leg was said to be floating. I did this, but I do not know what it is really for, Any ideas?? what would be a part number for that , I cannot locate this on the internet . this circuit is working in a 12 volt battery supply.

thanks ken

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