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Thread: If You Use Circuit breaker - help

  1. #1
    Newbie Joe_Collectible's Avatar
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    If You Use Circuit breaker - help

    How many of you are using an additional circuit breaker? (not vehcile's breaker) if so, tips and advice on what you did & what to watch for?

  2. #2
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    Breaker for what? DC-DC supply? Power inverter? Amps?

    A breaker is easy to add to anything.
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    Constant Bitrate blackpacu's Avatar
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    you can put a breaker anywhere you would put your fuse. It will do the same thing, just that youll be able to reset it.
    I have a breaker on my main power wire to my amps(at the battery), then fuse's from the distribution block on.

    You can use any breaker, aslong as its rated for the same amount as the fuse your going to replace
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    I used to use a breaker. Don't know why I didn't reinstall it for my new carputer. Anyway, you should be able to get a good one at any boating supply store. They'll have high-amperage ones, which are perfect for carputing.
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    Newbie Joe_Collectible's Avatar
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    ok, I am installing an amp with a 4 x 40 amp fuse rating so my in-line fuse would need to be something like 180-200a Plus... the other amp is 2 x 40 amp (100a in-line fuse) and then carputer (not sure on the ampere draw as of yet) maybe ~ 250 watts = 15a?

    Ok, since ANL type doesn't go that high, I am forced to use a breaker... but how do they work exactly? Do I simply run my 1/0 into the breaker and 4 gauge out to the amps and then carputer's inverter off one of the main lines (to one amp) with it's own in line fuse rated for the wattage.

    Lemme see if I get this straight then.
    If there is a surge, the breaker is simply to protect my car from catching on fire, right? But with a 200a circuit breaker, the circuit won't trip because a lil 16 gauge wire is shorted, therefore in-line fuse from distro for the puter on that wire. Now as for a 4 gauge grounding out.... the 200a circuit will trip immeadiately correct? - because that wire would fry and incinerate my truck in about 5 seconds if it sucked two 12 volt batteries dry. (and 3 farads or so) KaBooM!

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    Newbie Joe_Collectible's Avatar
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    Quote Originally Posted by Tony S
    I used to use a breaker. Don't know why I didn't reinstall it for my new carputer. Anyway, you should be able to get a good one at any boating supply store. They'll have high-amperage ones, which are perfect for carputing.
    btw... you said high-amperage perfect for carputing. I am pretty sure that I will only need a 140 watt power inverter to power my notebook hybrid. Are you considering that high ampere's?

    at 140 a 30 amp in-line fuse is plenty

  7. #7
    Variable Bitrate Superduck's Avatar
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    Quote Originally Posted by Joe_Collectible
    ok, I am installing an amp with a 4 x 40 amp fuse rating so my in-line fuse would need to be something like 180-200a Plus... the other amp is 2 x 40 amp (100a in-line fuse) and then carputer (not sure on the ampere draw as of yet) maybe ~ 250 watts = 15a?

    Hmm.. I'm thinking there's something wrong with this math... You're talking car audio amps, right? Are you sure those aren't 4x40 WATTS? I've got a 300 Watt amp with a 30 amp fuse.
    Watts = Volts X Amps
    Amps = Watts / Volts

    Sooo... 4x40 + 2x40 = 240W
    At 12 volts, that's 20 Amps.
    Or, at 14v, it's 17 Amps.
    Either way, it's WAY less than 200 amps.

    Does that help any?

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  8. #8
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    No kidding, that first amp, if it has four 40A fuses is something near a 2000W amp. If this is the case, you're going to want to put a fuse distrobutions as close to the battery as possible, because you're not going to be able to fuse some 300A. Breakers at currents much over 150A are sketchy. The magnetic field created when that much current is suddenly spiked can sometimes keep the breaker from reacting. Something like this http://www.cardomain.com/item/LITBFD4 would be what I would use in your application, just keep the power wire feeding it as short as humanly possible, and make sure connections are tight so that they don't slip out. Then you can fuse each amp, and the computer with their own appropriately sized fuse.

    BTW, unless you've double uped on altenators, you're not going to draw 300 A for very long. I too think you might be confused on your amps, possibly watts not amps.
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    Newbie Joe_Collectible's Avatar
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    negative ghostrider. I don't know how you got here from there, but you said your 300 watt amp has a 30a fuse. Right, therefore math is about 300/30 = 10a fuse per 100 watt.

    So... my 160a fuse protected amp according to your math would come in around 1600 watts. (that amp does a lil over 1500 in actuality)

    In-line fuse that protects the car from burning up needs to be in excess of the protected fuse rating in order to allow max draw. (four 40a fuses not watts per channel)

    That is about 200a for one amp... therefore circuit breaker.

    I am asking about running a 250 watt power supply from the distro which comes from breaker. (in-line fuse/or breaker)

  10. #10
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    To get real numbers, wattage is a function of voltage and current. W = V * I Therefore, if you're talking 160 A at a 12 V system you're talking 1920 Watts. Just because the amp says that it produces 1500 Watts of audio does NOT mean that it draws 1500 Watts. Amps are lossy. Now, to get technical, you're system will produce on average 13.6 volts. Thus the amp is REALLY using 2176 Watts when it is produicing 1500, which is about right. 70% to 80% efficiency is about what you'll expect.

    In any event, if you wish to run EVERYTHING off of a single fuse/breaker, you're looking at needing about a 260A breaker. But, you are then still back to needing to fuse each individual item. This is because your 250W pc power supply isn't going to blow the 260A breaker before the wires become the fuse and catch fire. I stand by my suggestion to get a Fuse distrobution panel.
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