That heat bed has a resistance of 2.4 ohms, so it will draw 10A @ 24V. I suggest a 14A fuse.
RAMPS is not ideal for 24V systems, because most RAMPS boards have 16V capacitors. But this doesn't stop you using a 24V supply for the heated bed only, and a 12V supply for everything else. Both my printers use Duet electronics, which can go up to almost 35V.
RAMPS is not ideal for 24V systems, because most RAMPS boards have 16V capacitors. But this doesn't stop you using a 24V supply for the heated bed only, and a 12V supply for everything else. Both my printers use Duet electronics, which can go up to almost 35V.