Help with short circuit protection for a lighting circuit

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hi everyone.

i have circuit controls multiple bulbs @ 12v , around 5a. @ min controled via relay turn on 12v , relay controled via arduino.

what happenning if there short ground on lighting circuit circuit smokes bit  :)

there 10 amp fuse in circuit , still have same problem if use 7.5a fuse.

is there anyway replace relay additional circuitry prevent fire happening.

without schematic of circuit can guess @ solution problem.


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