The fuse you use is determined by the load on the circuit and the size wiring used in that circuit not the battery voltage.
The capacity of a fuse is determined based on the expected current flow in the circuit. This is usually set slightly above the normal operating current to allow for surges without blowing the fuse unnecessarily. The capacity is typically indicated in amperes on the fuse itself.
The size fuse should be noted on the old fuse.
The physical size of an atom is largely determined by the size of the electron cloud.
It is determined by the weight not the height
The Fuse size is listed on the under side of the Fuse Cover.
Fuse SizesThe Amperage ratings [sizing] of fuses [and circuit breakers] is determined by the SIZE of the conductors [wires] in the circuit which they serve.The size of the wires is determined by the maximum expected current [measured in Amperes (Amps) or Milliamps (mA] needed by the electrical devices "fed" by the circuit.Therefore, the answer to your question is that there are many different "size" fuses which range in Amperage from thousandths of an Amp to hundreds of Amps.
The tag on the unit will tell you, minimum fuse size and maximum fuse size. Go wilth one in between.
The listing of fuse size and function is shown on the back size of the fuse box cover itself.
By the size of the atom and its mass
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