Join Date: Mar 2002
Location: Austin, TX, USA
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.
68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI