Fuses are rated in maximum _____________ and ______________.

Fuses are rated in maximum current and voltage because these two factors are critical to their functionality and safety in electrical circuits. The current rating signifies the maximum continuous current a fuse can safely carry without blowing. This ensures that the circuit can operate effectively within the designed limits. Exceeding this limit can cause the fuse to melt and interrupt the circuit, thereby protecting the circuit components from damage due to excessive current flow.

The voltage rating indicates the maximum voltage that the fuse can safely handle when interrupting a fault. If the voltage applied exceeds this rating, the fuse may not be able to extinguish an electrical arc that forms when it blows, which could lead to dangerous situations such as continued current flow or fire hazards.

By understanding that these two ratings form the essential parameters under which fuses operate, one can ensure that the correct fuse is selected for a particular application, maintaining both functionality and safety in electrical systems.