Which of the following is NOT a characteristic of a fuse wire?

It has high conductivity.

Reason — A fuse wire must get heated up quickly and melt when the current in the circuit exceeds the safe value. For this it is made of an alloy of lead and tin which has a high resistance and a low melting point. High conductivity means low resistance, so the wire would not get heated enough to melt. Hence high conductivity is not a characteristic of a fuse wire.