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Tractor Talk Discussion Forum

O.T. Why Fusible Link

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IA Roy

12-22-2007 19:17:51




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Having some electrical problems with the son's minivan. It has a number of fusible links, fortunately none were burned. Why do they use something like this instead of using a fuse to protect the circuit?




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guido

12-23-2007 09:12:31




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 Re: O.T. Why Fusible Link in reply to IA Roy, 12-22-2007 19:17:51  
Hey Roy
Fusible links provide circuit protection before the fuse box in the passenger compartment, usually located in the engine compartment. If a wire shorts to ground before the fuse panel, the fusible link gets hot and burns up opening the circuit, this will protect the rest of the wiring from major damage. THE ARE NOT ALWAYS THE SAME SIZE AS THE WIRE THE PROTECT. Fusible links can be just a piece of wire with markings on it, other have a tab.
Guido.

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John T

12-23-2007 07:50:22




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 Re: O.T. Why Fusible Link in reply to IA Roy, 12-22-2007 19:17:51  
I pretty much agree, They probably save the auto makers a few cents but with thousands of cars that adds up,,,,, the shop probably make money repairing them versus joe six pack replacing his own fuse,,,,,at least you dont have the mechanical mounting n corrossion problems as bad that can cause resistive carbon n heat.

John T



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MarkB_MI

12-23-2007 03:37:40




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 Re: O.T. Why Fusible Link in reply to IA Roy, 12-22-2007 19:17:51  
A fusible link is inherently more reliable than a fuse or circuit breaker, particularly under the hood of a car where water is a problem. Corrosion can cause problems with breakers and fuses, but a fusible link can be sealed up so it won't corrode. It makes a lot of sense to put fusible links on primary conductors that are unlikely to be overloaded. Before fusible links became popular, these wires were just left unfused, which could result in serious wiring damage or fire if a short occurred upstream of the fuse box.

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soundguy

12-22-2007 21:51:32




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 Re: O.T. Why Fusible Link in reply to IA Roy, 12-22-2007 19:17:51  
What bob said.

Back int he day of the glass fuse.. you could get a SB.. all the blade fuses I see today are FA.. besides the point that it's easy for an owner to repalce a blow fuse on his own.. he can pull it and see it.. no tools required.. the fuseable link onthe other hand might make the owner bring it in for a 'service call$$$ '

soundguy



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paul

12-22-2007 19:44:36




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 Re: O.T. Why Fusible Link in reply to IA Roy, 12-22-2007 19:17:51  
1. Cheaper to build.

2. Typically used for kinda major power draw areas, a fuse & holder that would hold up to those demands & routed out of dirt & rust areas would end up costing you as much to replace as the link. Or so I hear.

--->Paul



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Bob

12-22-2007 20:34:43




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 Re: O.T. Why Fusible Link in reply to paul, 12-22-2007 19:44:36  
Also, they act as a "slow-blo" fuse, carrying momentary overloads WITHOUT blowing.



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