Ignition fuse blown automatically

HI SIR HOW ARE YOU?
MY CAR WAS ON TOUR AND WHILE MOVING AL OF A SUDDEN IT STOPPED WORKING,
ONLY ROOF LIGHT AND INDICATORS WERE WORKING BUT NO LIGHT ON IGNITION OR SPEEDOMETER.
THEN MY DRIVER DISCUSSED IT WITH SOMEONE AND THEN FOUND THAT ONE OF THE FUSE IN THE BOX BEHIND THE BATTERY WHICH IS MOST PROB CONNECTED TO THE IGNITION WAS BLOWN,
HE CONNECTED A TEMP WIRE TO START IT AND WHEN TRIED TO CRANK, IT WORKED.
FINALY IT WAS SOLVED BUT THE REASON WHY I M WRITING THIS TO YOU IS THAT WHAT COULD BE THE POSSIBLE REASON BEHIND THIS PROBLEM.
I NEED TO SEND MY CAR ON ANOTHER TOUR AND WANT TO BE TENSION FREE.
PLEASE HELP ME AS I HAVE ANOTHER QUESTION FOR MY TOYOTA INNOVA.
THANKS
&
regrds
sharat bali