Is the voltage rating important?
Yes, very important! The voltage rating of the selected fuse must be greater than or equal to the circuit voltage. Since fuses have such low resistance, the voltage rating becomes critical only when the fuse is trying to open. The fuse must be able to open quickly, extinguish the arc after the fuse element has melted and prevent the system open circuit voltage from re-striking across the open fuse element.

How do you select the correct voltage rating for a fuse?
Fuse links are voltage sensitive devices and it is important to note that the satisfactory operation of a fuse link under fault conditions is dependent on the system voltage. Therefore they must not be installed in circuits with a voltage above their voltage rating. They can however be used satisfactorily in circuits at lower voltage levels. For example, you can use a 500V rated fuse in any circuit that has up to 500V.

Why do fuses have voltage rating?

Once the fuse blows, the voltage rating comes into play, which represents how much voltage potential the open fuse can withstand without flashing over and re-energizing the compromised load circuit. Voltage rating of the fuse must be greater than or equal to what would become the open circuit voltage