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differences in fuses versus circuit breakers

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deej(at)deej.net
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Posted: Wed Jul 22, 2009 7:09 am Post subject: differences in fuses versus circuit breakers

Hi Bob,

    For the 12v/24v DC circuits typically used in our aircraft, is there

any difference in the rating one would select if using a fuse versus a

circuit breaker?  In other words, a hypothetical example, if one arrived

at a value of 15 amps to protect a wire, would a 15 amp fuse be

interchangeable with a 15 amp circuit breaker for protecting the wire?



    I ask for two reasons - in a discussion on another mailing list,

someone has said that fuses and circuit breakers of the same rated value

are not interchangeable, and AC43.13-1B table 11-3 on page 11-15 in

Section 4 shows a 15 amp CB or a 10 amp fuse to protect a 16 gauge

copper wire (picture attached).



    If there is a difference, do you know and can you explain in simple

terms why?



Thanks,



-Dj



-- 

Dj Merrill - N1JOV

Glastar Sportsman 2+2 Builder #7118 N421DJ    

http://deej.net/sportsman/                    



"Many things that are unexplainable happen during the construction of an 

airplane."  --Dave Prizio, 30 Aug 2005

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deej(at)deej.net
Guest

Posted: Wed Jul 22, 2009 5:40 pm Post subject: differences in fuses versus circuit breakers

On 7/22/2009 7:25 PM, Robert L. Nuckolls, III wrote:

 	  Quote: 	
		     For our purposes, breakers and fuses are size-for-size interchangeable.


	


	Thanks!  



-Dj

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