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220 volt relay

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    220 volt relay

    Hi guys,
    Iím a second year student who does electrical engineering.
    Currently Iím working on a project which I need a relay to switch positive to negative if needed.
    Basically it should automatically figure out if the positive and negative are connected properly if not then it switch the polarity automatically.
    I did a lot of research but still couldnít find anything.
    Im going to use this relay to connect a lamp.
    Any help and suggestion would be appreciated

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    How complex do you want to get?

    Quote Originally Posted by Matt_J View Post
    Hi guys,
    Iím a second year student who does electrical engineering.
    Currently Iím working on a project which I need a relay to switch positive to negative if needed.
    Basically it should automatically figure out if the positive and negative are connected properly if not then it switch the polarity automatically.
    I did a lot of research but still couldnít find anything.
    Im going to use this relay to connect a lamp.
    Any help and suggestion would be appreciated
    Matt_J
    There are a few variables missing in the equations, but a simple solution would use a DPDT relay with a polarity sensitive coil. Wire (+) to pole 1 NC contact, and (-) to pole 1 NO contact, wire (-) to pole 2 NC and (+) to pole 2 NO contact. Wire coil to the pole 1 & 2 common leads as well as the lamp load. Hope this helps.

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