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Basic Wiring Help!

  1. Jul 27, 2015 #1
    Hi,

    I have an electrical instrument which needs a 12V feed.

    I have 2 power systems, and I want to select between them using an On-Off-On switch. I presume an SPDT is appropriate?

    I need to run the feed to the instrument through a 3A circuit breaker.

    Please could someone explain how I should wire this up? I am not sure which terminals on the Switch and CB I should use!

    The instrument is expensive, and I need to be sure this is done properly!

    I have attached a graphic of what I mean.

    Many Thanks
    Pete
     

    Attached Files:

  2. jcsd
  3. Jul 27, 2015 #2
    Attached is what I think needs to be done, but would appreciate someone confirming?

    Thanks
     

    Attached Files:

  4. Jul 27, 2015 #3

    anorlunda

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    Science Advisor
    Gold Member

    Is this the only load to be served by those two batteries? If there are many, and if they may be large, then it is safest to use a "battery switch" for the ON-OFF-ON function in PetePetePete's diagram. They use a make-before-break system that prevents interruption before switching. They also include the ALL or BOTH position to use both batteries at once.




    bat_switch.jpg
     
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