Quote:
Originally Posted by Superman
Enough for a welder. This is the first I have heard of a 50-amp automotive circuit.
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Big motors (like cooling fan motors) have a current spike when they start up, called the inrush current. A fan might clip along all day long at 15 amps, but starting it might take 40 amps. It's the kick that overcomes the inertia.
So, your 15 amp fuse and relay might be fine when it's running, but you'll end up smoking one of them with a cooling fan that turns on and off several times a trip.