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ATS contactors sizing
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Hello @h171 ,
Have you looked at: Discover-TransferPacT-Automatic-The-new-Generation-of-All-in-one/ Post from Schneider Electric? Some good and nice information about the automatic transfer pacts from Schneider Electric.
The questions you are asking about the poles are not really for us to answer, but for your net supplier and regulations etc.
It depends on what type of distribution system you get inside your building and what type of system you want to keep going into the building; TN-C, TN-S or TT.
If you are only talking about the contactor being 3 or 4 pole. In our country we have certain regulations regarding using contactors for by instance an emergency stop.
In this case (emergency stop) you always have to fully switch the installation off, that is including the N (Null-zero) so in that case you always need a 4 pole contactor.
Also your question related to the AC-1 or AC-3 contator and usage, I think this page might help you out with that; AC1 vs AC3 (For short reference it has to do with what kinda load you are using the contactor for, light loads or industrial loads).
Hope this has given you some valuable insight and info!
Kind regards,
Rick - Eltechna B.V.
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