The fuse is there to prevent the transistors blowing.
That is not quite correct. The fuse is there to PREVENT THE MACHINE FROM CATCHING FIRE and nothing else.
A fuse is a mechanical device and a transistor is a semiconductor - excessive load on the semiconductor will fry it in micro-seconds where the fuse will take MUCH longer to go open circuit. By the time the fuse blows, usually damage has already been done to the semiconductors.
Yeah I see what your saying, coils are locked on due to a board fault, fuse blows to stop the coils overheating and creating a fire.
But if the board fault is repaired and the correct fuse is installed but the coils have a short, surely some protection is provided to the board by the fuse.
