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IAC overcurrent relay, target and seal in coil

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    IAC overcurrent relay, target and seal in coil

    On a typical IAC overcurrent relay, the target and seal in coil is in series with which of the following?
    Instantaneous unit
    None of the other answers are correct
    Time Unit
    Current transformer
    Instantaneous unit & Current transformer & Time Unit

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  3. Ore905 is offline Junior Member
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    Quote Originally Posted by jflan13 View Post
    On a typical IAC overcurrent relay, the target and seal in coil is in series with which of the following?
    Instantaneous unit
    None of the other answers are correct
    Time Unit
    Current transformer
    Instantaneous unit & Current transformer & Time Unit
    To be honest I'm not a fan of most of the questions in the quizzes on this site but most times seal in coil is in series with time element trip contact on the old electromechanical units.

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    Quote Originally Posted by Ore905 View Post
    To be honest I'm not a fan of most of the questions in the quizzes on this site but most times seal in coil is in series with time element trip contact on the old electromechanical units.
    Thank you for the help again

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  7. SecondGen's Avatar
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    Quote Originally Posted by jflan13 View Post
    On a typical IAC overcurrent relay, the target and seal in coil is in series with which of the following?
    Instantaneous unit
    None of the other answers are correct
    Time Unit
    Current transformer
    Instantaneous unit & Current transformer & Time Unit

    The seal-in unit has its coil in series and its contacts in parallel with the contacts of the time-overcurrent unit, such that when the induction unit contacts close, the seal-in unit picks up and seals in. When the seal-in unit picks up, it raises a target into view, which latches up and remains exposed until released by pressing a button.

    Click image for larger version. 

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    https://www.eiseverywhere.com/file_u...a3_GEIAC77.pdf

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    Quote Originally Posted by SecondGen View Post
    The seal—in unit has its coil in series and its contacts in parallel with the contacts of the time—overcurrent unit, such that when the induction—unit contacts close, the seal—in unit picks up and seals in. When the seal—in unit picks up, it raises a target into view, which latches up and remains exposed until released by pressing a button.

    Click image for larger version. 

Name:	Untitled-1.png 
Views:	8 
Size:	59.8 KB 
ID:	235

    https://www.eiseverywhere.com/file_u...a3_GEIAC77.pdf
    Awesome, thank you

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