Bosch type relay - Team Camaro Tech
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post #1 of 6 (permalink) Old Feb 28th, 09, 03:16 PM Thread Starter
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Red
 
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Bosch type relay

On the wire to the battery do you have to run the Circuit Breaker and a fuse or just the fuse or both?Thanks
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post #2 of 6 (permalink) Old Feb 28th, 09, 03:28 PM
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Larry
 
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Re: Bosch type relay

I use a fuseable link 2 sizes smaller than the power feed wire for fail safe operation and protection in case of a direct short. A circuit breaker will work too if the same amperage as the relay, the advantage being it will reset if accidentially tripped or you have an intermitant problem. A relay is for carring a electrical load, and imho a fuse is a weak link as when it's done, it's done. Remember, everything electrical has smoke in it... and it's not done until you let the smoke out...lol

Sometimes it's better to let someone think your an idiot, than to open your mouth and remove all doubt...

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post #3 of 6 (permalink) Old Feb 28th, 09, 03:54 PM Thread Starter
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Red
 
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Re: Bosch type relay

Ok Thanks for the help.
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post #4 of 6 (permalink) Old Feb 28th, 09, 10:46 PM
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Re: Bosch type relay

Fuses are good for well behaved loads that draw minimal current and don't have too much of a turn-on current spike. Fusable links are best suited as a safety device to prevent a wiring system melt-down. They're best when the power supply line runs a fair distance where there is a risk of a wire rubbing through and creating a short ahead of the fuse / breaker. There aren't too many cases where a fusable link alone makes a good fuse. An exception would be high current loads, especially motors (like electric fans) that draw huge currents (in excess of 20 amps) and have an even larger turn-on current spike. Something like head lights would probably be best suited by a self resetting circuit breaker. Any high wattage bulb will have a sharp current spike when you turn them on, but not nearly as much as a motor. A self resetting thermal breaker would handle that with no problem. You didn't saw what your load is so hopefully these guidelines will give you same ideas.

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post #5 of 6 (permalink) Old Mar 1st, 09, 02:32 PM Thread Starter
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Red
 
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Re: Bosch type relay

It was for a electric fuel pump and a msd ignition.
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post #6 of 6 (permalink) Old Mar 1st, 09, 04:49 PM
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Re: Bosch type relay

A fuse would be a better choice for those IMHO. However you could use a fusable link to the supply side of the relay and a fuse on the load side.

Dave
========================
68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI
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