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Thread: relay for 4 guage wire, where to get?

  1. #1
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    relay for 4 guage wire, where to get?

    Hi guys and girls,

    I tried to search for the relay topic; however, mostly showed how to wire it up but not the hardware itself. As the title stated, i have a 4 gauge power wire, but most of relay i saw was for small wires. If possible, please give a link, name or picture, so it can make more sense to me.

    Thanks a lot.

  2. #2
    FLAC
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    Just how much current are you planning on passing through this relay?

  3. #3
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    4 gauge wire relay

    A relay for that kind of wire is not available. You need a solinoid. Just make sure you get a continous duty and not a latching solinoid. A latching unit takes a momentary switch while a continous unit remains closed as long as power is supplied to the coil.
    RV parts suppliers and repair facilities usually carry such a device in stock for high power systems such as room slides.
    Merry Christmas,
    DNR

  4. #4
    FLAC
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    Quote Originally Posted by dnr250 View Post
    A relay for that kind of wire is not available. You need a solinoid. Just make sure you get a continous duty and not a latching solinoid. A latching unit takes a momentary switch while a continous unit remains closed as long as power is supplied to the coil.
    RV parts suppliers and repair facilities usually carry such a device in stock for high power systems such as room slides.
    Merry Christmas,
    DNR
    Stinger makes some, and in that case, you just need some 4 AWG ring terminals.

    Solenoid vs. Relay is semantics (as it applies to is common use in this application)

    A solenoid is a device that uses current through a coil to create a field to act on an armature which moves something, in these cases it's a switch.

    A relay is a device that uses current through a coil to create a field to act on a switch.

    I don't disagree with you, there is a difference. But for instance, sitnger calls theirs 'high current relays'.

  5. #5
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    Wow! That was fast replies there guys. So i need to get either a solenoid or relay then. Is there any cons and pro between them?

    I found this stinger relay http://www.hifisoundconnection.com/S...id/0/SFV/30046
    it call stinger SR80 high current 80amp relay, so i think it should be ok for my 80 amp fuse

    For the ring terminals. I think this should work http://www.hifisoundconnection.com/S...id/0/SFV/30046

  6. #6
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    Quote Originally Posted by gen6_civic_pc View Post
    Wow! That was fast replies there guys. So i need to get either a solenoid or relay then. Is there any cons and pro between them?

    I found this stinger relay http://www.hifisoundconnection.com/S...id/0/SFV/30046
    it call stinger SR80 high current 80amp relay, so i think it should be ok for my 80 amp fuse

    For the ring terminals. I think this should work http://www.hifisoundconnection.com/S...id/0/SFV/30046
    They really should have put an amp rating on that for you. You should consider what the max amps your system will draw. It's important to know, so that you don't pick a relay that will fail.

    I think that relay is for 80 amps, and your wire can carry ~130 amps safely.
    If you're having trouble knowing how many amps to expect, what are you powering (total) through this thing (how many watts)? For instance this may be more appropriate if you plan on maxing out that 4 AWG.

    No pros and cons, what stinger and others are selling as high power relays, are essentially the same as what OEM's and others call switching solenoids. No worries there.
    You're just not likely to find that typical black cube style of relay rated so high.

  7. #7
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    so it is safer to have the more amps for the solenoid/relay than the current amp of the wire itself?

    Follow the powercable from the batter will be a distribution fuses block that has 4 output.

    1 will go to opus 250w (21 amps)
    1 will go to amplifer 40amps (@12volts its 480watts)
    the other 2 maybe for smaller stuffs like some neon lights or usb devices.

    so i figure probably no more than 70amps.

    So u think i should really go for the 150 AMP SOLENOID from ebay? The solenoid looks intimated...sorry i'm not very good with electrical

    BTW thanks for helping out guys

  8. #8
    Constant Bitrate moboman's Avatar
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    What do you need a relay for 4ga for?
    use a small relay for the computer, if the opus 250w does not have a power switch like the m2.
    connect the on (middle terminal) on the amps to the ign on if thats what is going to turn on your carpc.

    I just dont want you to buy stuff you dont need.
    My Worklog
    I'm using my carputer 100%, but I still need to make it easier to use.

  9. #9
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    I figured the relay sit between the power wire will cut off the current when the car is off and allow the current to flow through from the battery once the car turn on.

    Now i think about it, does the relay give me problem? Because since the car turn off that send a signal to Opus ps to put the pc to hibernate, but if the relay cut the power off once the key off the car, doesn't that will shut the pc down before it can hibernate?

  10. #10
    Constant Bitrate
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    im an electrical engineer (aerospace) and we never call what he needs a solenoid. they are relays, even in high wattage uses. relays contain solenoids, but just a solenoid is completely different than a relay.

    gen, if you use a relay to cut the power to your carpc once you key off your car, the computer will never have a chance to turn off completely. you shouldnt be worried about cutting off power to the computer with the car off, thats what the opus shutdown controller does.

    you may want to be able to hard control the poewr to the pc when the car is on, however, if for some reason (ie an emergency) you want the thing off instantly. one way to do this is a relay, like you are thinking. you'd want to wire up the relay control (coil, or solenoid) to an independant switch as well, not your ignition/key
    just make sure you are ONLY messing with the power to your carpc/audio equipment and not the other systems in your car, that would be a very bad thing to mess up.

    for example, this relay might work:
    [media]http://www.songchuan.com/PPDF/897.pdf[/media] (mouser.com has these)
    its got a 70amp contact rating at 12VDC which looks like it would be acceptable for your applicatin. you might want to go higher just incase though.

    go take a look at mouser.com, under electromechanical, then General Purpose / Industrial Relays. you need something with a ~12V coil rating as well.

    dont bother with audio stores, just go straight to the electronics parts stores like jameco or mouser.com, they're better and cheaper and have a larger selection.

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