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Thread: Wiring dilemma

  1. #21
    Variable Bitrate
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    Is this the one to get?
    http://www.mouser.com/ProductDetail/...52bqaX3n4M8%3d

    I'm a little unsure because it has two images with two different contacts, as well as stating 30A...I don't know if that means it needs 30A or the max it can handle is 30A.

    Or do you know of a better one?

  2. #22
    Raw Wave
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    Way overkill, but useable.

    You only want to switch low power (current) signals - probably uA (micro-Amps) else mA. 30A contacts are for lights etc.


    I was thinking more like this:

    ... which is a 1A DPDT from Jaycar (see Jaycar catNo: SY4061; 12V DPDT Mini PCB Relay (AUD$4.95) or the similar 5A PCB mounting Jaycar catNo: SY4052; 12V DPDT Special PC Mount Relay ($8.95).

    But those relays are fairly common from electronics etc shops & sites. EG - Try searching "FRS6-1 relay" for the first one.



    Relays are rated by their coil voltage (eg, 12V) and their contact rating (eg, 30A). As I wrote earlier, don't confuse the 2 specs.
    As it happens, your linked relay has contacts also rated for 12VDC (usually they are higher, eg, 30VDC, 125VAC etc).
    But its coil current is only 140mA compared to its contacts that can handle up to 30A.
    (Coil current deduced from its coil voltage & resistance & Ohm's Law V=IR, hence I = V/R = 12V/86Ohms = .14A = 140mA. IE - Those contacts can carry 215 times the current that the coil uses. [Remember: "amplifier" - not that it amplifies, it merely allows larger currents to be switched.])

    And the contacts are like a switch.
    Just because a switch can handle 10A does not mean it MUST switch 10A, it just means "up to" 10A.
    Last edited by OldSpark; 03-29-2012 at 02:57 AM.

  3. #23
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    yeah, it is overkill...price and amp...but I really wanted the contacts to be quick connects and I couldn't find any others.

    EDIT:
    This is the other option I found with what looks like quick connects, good enough? ...I would have just prefered the all black, just looks a little sturdier.
    http://www.alliedelec.com/search/pro...8809#tab=specs
    Last edited by Champak; 03-29-2012 at 01:26 PM.

  4. #24
    MySQL Error soundman98's Avatar
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    that will also work.

  5. #25
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    Cool, then that's what I will go with. I want to thank both of you for all your help and patience.

  6. #26
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    Maybe dumb question, but Is it ok to use my switch to power both this and another relay?

  7. #27
    Raw Wave
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    Dumb question? No such thing is there?


    Yep, should be fine.
    As in one switch to lots of parallel relay coils.. totally fine. I do that for headlights - eg, one relay per filament.


    It's also done to boost or multiply battery isolators. EG - to boost a 10A or 80A battery isolator to handle 400A or to handle several batteries - just have the original isolator (voltage sensing or UIBI) switch the 400A relay coil or the many relay coils instead of the original battery.
    Sure, the original battery isolator is a relay, but its contacts are merely another switch - it's the same principle. (Can't do that with a diode isolator eh?!)



    PS - provided the total coil current does not exceed the switch rating.
    In fact being an inductive, I'd probably halve the switch's current rating (unless it is rated for inductive loads and motors) - tho that might be overkill or need investigation...
    Last edited by OldSpark; 02-19-2014 at 04:48 PM. Reason: PS...

  8. #28
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    Thanks.

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