Fuses And Circuit Breaker problems of the 2003 Jeep Cherokee

Consumer states: vehicle cuts off while going down the highway, no warning, doing almost 70 mph. Nothing worked, and there were no brakes. The only thing working was the 4-way flashers. Tried to turn steering wheel and lost power steering. Another time went to turn in the position the wheels were and in that was the way the vehicle went. The repair shop mechanic said it needed a crank sensor. Previously, before they put in a fuse and it blew out.