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Old 01-04-2016, 21:42   #1
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Join Date: May 2012
Location: Central California
Boat: Catalina 30
Posts: 873
Simple Circuit Breaker Question

Simple question: Wire
from first battery to circuit breaker,
then wire to ACR, then wire to
circuit breaker, then wire to second
battery. Does it make much difference
where in the length of the wires to put
the circuit breakers? Distance is about
4 to 5 feet total and #6 wire.

Can the circuit breakers both be within
about 10 inches either side of the ACR
and still protect the full length of wires?

My assumption has always been that
the circuit breaker should be closer
to the battery end, but does it make
that much difference?
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Old 01-04-2016, 21:58   #2
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Location: Brisbane, Qld, Australia
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Re: Simple Circuit Breaker Question

Fine to locate circuit breakers near ACR.

Note 1.cable between battery and circuitbreaker is not protected in the case of insulation being damaged and a short occurring ,so make sure cable is protected from sharp edges and vibration and heat ect. This is why closer to battery is better but depends on likely hood of cable damage occurring.

Note 2. Entire cable is protected from drawing more current than circuit breaker rating for loads connected to load side of circuit breaker. ( circuit breakers do allow more than rating for short periods)

Hope this helps Dean

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Old 01-04-2016, 22:40   #3
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Re: Simple Circuit Breaker Question

That agrees with my thinking. Thanks.
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Old 03-04-2016, 21:34   #4
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Re: Simple Circuit Breaker Question

it should be close to battery. if you are connecting the wires to the battery itself the blue sea MRBF's are great. as you can't get any closer to battery then that. and it's only 2 wires instead of 4, less lugs, less terminations to go lose
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