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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#1
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MCBs for low voltage (as in 12 volts) - practical?
Is it possible/sensible to use 'standard' mains DIN rail MCBs as
protective devices on 12 volt DC systems or would the voltage drop across them be too great? A small[ish] consumer unit would be a neat solution to use as a distribution box for the 12 volt wiring on our new (to us) boat, much cheaper and easier than a custom solution. -- Chris Green |
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MCBs for low voltage (as in 12 volts) - practical?
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#4
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MCBs for low voltage (as in 12 volts) - practical?
On Wed, 7 Jul 2010 15:14:19 +0100, wrote:
A small[ish] consumer unit would be a neat solution to use as a distribution box for the 12 volt wiring on our new (to us) boat, much cheaper and easier than a custom solution. I've used Polyswitches (polymeric positive temperature coefficient devices) for circuit protection on boats in the past. |
#5
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MCBs for low voltage (as in 12 volts) - practical?
Dave Osborne wrote:
[snip] Thanks for the links, so I need to choose manufacturer, no problem there. No indication of voltage drop though that I can see. -- Chris Green |
#6
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MCBs for low voltage (as in 12 volts) - practical?
On Wed, 07 Jul 2010 15:14:19 +0100, tinnews wrote:
Is it possible/sensible to use 'standard' mains DIN rail MCBs as protective devices on 12 volt DC systems or would the voltage drop across them be too great? A small[ish] consumer unit would be a neat solution to use as a distribution box for the 12 volt wiring on our new (to us) boat, much cheaper and easier than a custom solution. Shouldn't be a problem. There isn't much voltage drop as the magnetic trip uses a heavy wire coil. The DC current rating will almost certainly stay the same up to 30V. Above that and you get problems as there can be insufficient air gap to break the arc. Check your mcb spec though, you may have to use type D, especially if you have inductive loads. There are some breakers intended for DC applications though, these are usually thermal releases only and don't give good short circuit protection. Usually low current ratings only. -- Mick (Working in a M$-free zone!) Web: http://www.nascom.info Filtering everything posted from googlegroups to kill spam. |
#7
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MCBs for low voltage (as in 12 volts) - practical?
On Jul 8, 10:45*am, wrote:
Dave Osborne wrote: [snip] Thanks for the links, so I need to choose manufacturer, no problem there. No indication of voltage drop though that I can see. can always go to a local seller armed with a very good multimeter NT |
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