Can someone explain, just exactly how a fuse protects the playfield? A coil of wire is going to draw a certain amount of current whether it's on for 1/4 of a second or 5 minutes. In actuality, the resistance of copper goes up as the temperature increases, so as it gets hotter, the current draw goes down. So, is the wire getting hot enough to melt the insulation and short circuit the windings? If that's the logic, then it seems like a fine line between melted insulation temperature and burned playfield paint temperature. Or is it that the circuit is actually drawing slightly more than 2 amps, but the fuse can stand it because it's only drawing for a split second? Then when the circuit locks on, the fuse eventually heats up like a space heater and melts.

Thanks everyone for your thoughts and explanations. Makes sense.

Looking forward to this board. How about putting LED indicators near the fuses?