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09-14-2019, 11:29 AM
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#1
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Senior Member
Join Date: Jul 2011
Posts: 1,144
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Are DC breakers polarized?
Hi there,
I know you don't have to pay attention to polarity on DC fuses, but what about DC breakers? Like the ones where you push in the button and rotate a little lever to reset. Is there a + and - end to the breaker?
Thanks!
__________________
2004 Tiffin Allegro 27.5 ft. P32 18,000 lb. GVW. 8.1 liter. Workhorse chassis built May 2002. 35,500 miles. 2012 Jeep Liberty Toad. RVi2 brake unit.
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09-14-2019, 11:47 AM
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#2
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Senior Member
Join Date: Jul 2014
Posts: 35,424
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Its not marked + or -.
There will be a terminal marked Batt or B+ and the other marked Aux. or Load.
 
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09-14-2019, 01:29 PM
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#3
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Senior Member
Join Date: Nov 2015
Posts: 26,825
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DC Circuit Breaker is DC POS IN and OUT
Polarity is about connecting POS and NEG correctly
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Dodge 3500 w/Tractor Motor
US NAVY---USS Decatur DDG-31
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09-15-2019, 09:48 AM
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#4
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Senior Member
Join Date: Jul 2011
Posts: 1,144
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Quote:
Originally Posted by Old-Biscuit
DC Circuit Breaker is DC POS IN and OUT
Polarity is about connecting POS and NEG correctly
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OK, thanks. So, if a DC breaker is DC POS IN, when it is installed between a converter and a battery, since the converter is putting out a higher voltage than the battery (in order to charge it), would you put the DC POS Out on the controller end, or on the battery end?
__________________
2004 Tiffin Allegro 27.5 ft. P32 18,000 lb. GVW. 8.1 liter. Workhorse chassis built May 2002. 35,500 miles. 2012 Jeep Liberty Toad. RVi2 brake unit.
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09-15-2019, 11:01 AM
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#5
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Senior Member
Join Date: Jul 2014
Posts: 35,424
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The breaker is there to protect the wiring.
The converter can only output what ever amps its rated to, lets say 55 amps. Even shorted it can't produce more amps.
The wire and breaker should be rated above that by 10% to 20% so it doesn't melt the wiring or trip the breaker while its working under full load.
The battery can output hundreds, often 1000s of amps. That will melt all but the biggest cables if shorted, causing a big chance of fire.
That battery energy is what you need to protect against, so the B+ or Batt IN side goes to the battery.
You also want the breaker close to the battery to limit how much wire is un-protected.
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09-15-2019, 12:50 PM
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#6
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Senior Member
Join Date: Jul 2011
Posts: 1,144
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Quote:
Originally Posted by twinboat
The breaker is there to protect the wiring.
The converter can only output what ever amps its rated to, lets say 55 amps. Even shorted it can't produce more amps.
The wire and breaker should be rated above that by 10% to 20% so it doesn't melt the wiring or trip the breaker while its working under full load.
The battery can output hundreds, often 1000s of amps. That will melt all but the biggest cables if shorted, causing a big chance of fire.
That battery energy is what you need to protect against, so the B+ or Batt IN side goes to the battery.
You also want the breaker close to the battery to limit how much wire is un-protected.
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OK...I get it. Thank you for the explanation.
__________________
2004 Tiffin Allegro 27.5 ft. P32 18,000 lb. GVW. 8.1 liter. Workhorse chassis built May 2002. 35,500 miles. 2012 Jeep Liberty Toad. RVi2 brake unit.
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