Hello,
A basic fuse model could be implemented as a switch that is initially closed and opens when the current exceeds a certain threshold:
If the current is inductive you'll need to add a finite off-resistance (say, 1e6 ... 1e8 Ohms) in parallel with the switch, in order to avoid errors due to state inconsistencies.
You could also insert a Turn-on Delay between the Relational Operator and the Flip-flop so that the fuse will blow only if the current continuously exceeds the threshold for a certain amount of time.
The output of the flip flop could also directly close the M1/M2/M3 switches in synchronization with the fuse opening event.
