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Captiva, thats not right.
The Inline fuse, should be no larger than what ur cables are rated for. The inline fuse is there to stop too much current in the cables, thus too much heat and melting and shorting.
There just like the fuses on ur house. They go out with too much current, coz n e more, and there a risk of fire.
If the cable u got, cant handle all ur amps, buy thicker cable
I'm working on the assumption that the installation is using cables of a sufficient current rating to handle the amps and what they can draw.. most installations that use a 4awg cable as the main run would be able to handle more current than the amps with the kind of fuse ratings described in the 1st post can draw so I'm merely saying that the inline fuse shouldn't be of a much higher amp rating than the total of the fuses on the amps themselves.
Like you said, the fuse should stop too much current being drawn, so if more current is being drawn than what the fuses on the amps are rated at that means that there is something wrong with the amps and their fusing so you would want them to shut down, hence my post.
I didn't mention anything about fuse ratings in relation to cable ratings, which I probably should have coz it is certainly very important..but nothing I said is actually wrong..