Let's say I need a 45A fuse.
However, I have only a 40A and a 5A fuse in my pocket.
If I put them together in parallel, will it act as single 45A fuse ? (so it will blow up if current is superior to 45A).
My guess is the 5A fuse might blow up before reaching 45A, because the resistance ratio of each fuse might not be the same as the ratio of their current rating (5/40). Because of that, there might be more than 5A going trought the 5A fuse before reaching 45A.