12 volt relay question

Discussion in 'General Electronics Chat' started by dmc0162, Jun 24, 2012.

  1. dmc0162

    Thread Starter Active Member

    Dec 13, 2007
    51
    1
    This is a very basic question, but I figured I would ask because I am not sure of the answer. Is it possible to use an automotive 12 volt relay to switch a 9 volt power source?


    What I want to do is, use a normal +12v signal to trigger the relay. However, instead of having it trigger a higher amp 12 volt, I need it to trigger a 9 volt battery to power my device. So, overall the question is, can I use a 12v relay, triggered by a 12 volt signal, to switch on a 9v power circuit? Thanks
     
  2. #12

    Expert

    Nov 30, 2010
    16,278
    6,788
    Yes.

    Voltage ratings are usually the maximum safe voltage.
     
  3. crutschow

    Expert

    Mar 14, 2008
    13,002
    3,229
    Yes. The relay coil rating is independent of the contact rating. And you can always switch a lower voltage with the contacts than the relay's rating.
     
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