Ok I have the 5hp rotary phase converter which is a 3 phase motor which is run of 2 legs single phase and the third leg is generated by the motor . Now the issue is I have a master electrician friend who bought me a fusible disconnect that is called a pull type . It is a good enclosure but I cannot use it as an on off switch or let's say I don't feel comfortable using it as a on off switch. So I went to a huge electrical supply store and talked with a card carrying electrician about a on off switch or start stop switch and I wanted it inline with the power going to the phase converter but he kept telling me that it wouldn't work that way. And blah blah he brought out this switch which looked exactly like what I wanted and I bought it and was happy but I pulled it apart and it is a momentary switch which I am assuming I must use a relay with . Which is fine but I have no idea how a momentary switch works with AC power . I think I understand that the momentary switch energizes the relay and starts the machine , maybe? But I'm still confused . Here are photos can someone please explain this to me . What I want, whether is be a momentary button or breaks type start stop, I want to be able to push start and stop to turn the machine on or off. This is the inside of the phase converter I have close ups if anyone needs them . These are the two switches the one on the left is a breaker type start and stop and the one on the right a momentary push to start . This is the inside of the breaker type switch this is for a three phase but can be used as a single phase as well. But I want to keep it on the shaper head with my Cincinnati mill. Obviously this type switch works with the power online to the motor... I don't know why that electrician was telling me switches can work this way. This is the inside of the momentary which I'm not exactly sure how this works so if someone could explain that would be awesome! But again I think I need a relay with this one . This is the inside cover I've the disconnect Basically I have a fusible disconnect and I want a start stop switch in between that and the phase converter . Or should I just take out this disconnect and put a knife type disconnect and just use that as my on off to the converter ? No the converter did not come with its own on odd switch. When you apply power to it . It comes on . Please please help!