Re: 3-pole or 4-pole contactor Home › Electrical Engineering Forum › General Discussion › 3-pole or 4-pole contactor › Re: 3-pole or 4-pole contactor 2011/05/11 at 3:03 am #12079 erickenchParticipant How can you have 4 single phase circuits? If it's a three phase circuit and your trying to setup an ATS you would need a four-pole contactor so that the neutral would also be switched. Otherwise the two power sources would not be separately derived.
