Is it really related to an accident? (I don't think an accident will normally trigger this.) Or is it just to protect against an overcurrent event? Like a shorted out inverter, or cable. (Which I guess is possible in an accident, but normally an accident would cause the contactors to be opened as soon as the air bags go off, likely before enough damage to short a cable out occurred.)
From what I can see there is no connection to the fuse other than the power input and power output, so it can't be triggered by anything else in the vehicle.