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Thread: help needed to wire 12V relay

  1. #1
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    help needed to wire 12V relay

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    excuse my crude drawing......

    my understanding is (and just wanting confirmation)

    0----------------1 *is the current to switch the relay

    3-------4 if i wire here it is "on" until current switched it to off

    4----- * * -------2 *if i wire here its "off" until switched when current at 0----1 *




    thanks

  2. #2
    A_M
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    Re: help needed to wire 12V relay

    Depends...

    But in effect yes...

    One usualy needs tonknow what the de energised stat is ... Ie. NO. Or NC. Thus you can plan / manage the state in a fail status.. Many forget and it can cause big problems...

    What is the intended use ???

  3. #3
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    Re: help needed to wire 12V relay

    Quote Originally Posted by 06292022350A26292620222A222933470 link=1275113323/1#1 date=1275114003
    Depends...
    One usualy needs to know what the de energised stat is ... *Ie. *NO. Or NC. *
    thanks AM

    do you mean by this that you need to no what is happening at 0-----1
    eg if it has current all the time then reverse my understanding
    if it has no current all the time then my understanding is correct

    usage is a 12v timer (omron, preset timer press switch to run X time) triggering a 12v fan

    thanks


  4. #4
    A_M
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    Re: help needed to wire 12V relay

    Quote Originally Posted by 2B272E23232A460 link=1275113323/2#2 date=1275115594
    o you mean by this that you need to no what is happening at 0-----1
    Yes...

    Most units will State NC or NO status as being NOT energised..

    Ignoring your input/assumptions..

    The drawing you provided would be what I expect with NO POWER applied.

    i.e. 3-4 NC

    With power then;

    3 - 4 = open and 4 - 2 should be Closed.



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