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you don't have use something as inelligent as a cobbeled together, homemade, dissconnect. just use an industrial grade contactor. a contactor is basicaly a beefy, rebuildable, confugrable, relay. what you do is use the contactor to turn on the system power. the reason for using a contactor is you can wire it to dissconnect if theres a overload and you can also wire up a master stop/dissconnect button that will kill all power. the way you do this is something called "memory lock-in". look it up, better yet pick up the book "Electrical Motor Controls for Integrated Systems" ISBN 978-0-8269-1217-6 it's an excellent book and teaches you all about contacters, single and three phase motors and a whole slew of other things electro-mech related.
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