10-09-2011, 03:14 AM
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Banned
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Join Date: Nov 2001
Location: Cape Cod Massachusetts
Posts: 1,427
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Quote:
Originally Posted by sjh
Only way you'd know how his newly constructed fuse worked was by testing.
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Quote:
Originally Posted by sjh
It seems implausible but it may carry more than 30A before it melted.
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I'm going to assume that you are familiar with the fuse in question, and know that it is essentially a flat strip of a particular alloy with particular cross sectional dimensions the result of which it acts as an over current safety device that melts when a current above which is rated flows through it. Seen here:
http://catalog.peachparts.com/ShopByVehicle.epc?q=1990-Mercedes--Benz-300d-Body--Electrical&yearid=1990%40%401990&makeid=63%40%40MERCEDES+BENZ%40%40X&modelid=6178%3AED%7C10000095%3AMBC%7C1501%40%40300D&catid=241959%40%40Body+Electrical&subcatid=241971@@Fuse&mode=PD
In this case the metal strip fractured in or about its middle according to the OP, and it was soldered at that fracture point to restore both the mechanical and electrical integrity of the metal strip.
In the event that the fuse was subjected to a current flow above which it was originally rated the original un-soldered metallic strip on either side of the solder joint would melt the same as it would if it was in original condition thereby creating an open circuit.
I would postulate that it is inexplicable rather than implausible, as to how given the circumstances the fuse in this case could possibly carry more current after the repair as described, as it would have before the repair. I would be very interested in hearing about and understanding the metallurgical theory that would cause the alloy in question act differently, all other circumstances being equal.
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