A "10A" fuse that is a fuse rated for 10 amps (A stands for amps, a measure of current flow). A 10 amp fuse will be used to power and protect a circuit that requires a maximum input current of 10 amps. ... Fuses do not run normally at 10.00 amps and blow at 10.01 amps, they can't be made to be that precise and repeatable.