fuse

an electrical device that can interrupt the flow of electrical current when it is overloaded

any igniter that is used to initiate the burning of a propellant

mix together different elements; "The colors blend well"

become plastic or fluid or liquefied from heat; "The substances fused at a very high temperature"

equip with a fuse; provide with a fuse

make liquid or plastic by heating; "The storm fused the electric mains"