... 3. 3 incoming and 1 outgoing Automatic Transfer Switch for Generator(ATS)1. 3 incoming + 1 outgoing :It ... sources are also exist.No. 2 to the local area generator (AG ) , when (NN) doesn’t exist, ... even if (HG) exists.No. 3 to the house generator (HG), when both (NN) & (AG) don’t ... box, C - connectors,D - indication lamps (or LED) ,E - additional auxiliary contacts ( 1 NO + 1 NC ) , to stop the generator ...