Why should the melting point of a fuse wire be low?

(N/A) fuse wire is designed to protect electrical appliances from damage caused by excessive current. When the current flowing through the circuit exceeds the safe limit,the heat generated $(H = I^2Rt)$ increases significantly. Because the fuse wire has a low melting point,it melts quickly when this excess heat is produced,thereby breaking the circuit and preventing further flow of current. This action protects the connected devices from potential damage or fire hazards.