Which are the extreme values of a fuse factor?

The fuse factor, often defined as the ratio of the minimum melting current (MMC) to the rated current of a fuse, typically ranges from 1.5 to 10. Extreme values can occur based on the specific application and type of fuse; for example, in certain high-speed or special fuses, the factor may exceed 10. Generally, a higher fuse factor indicates a faster response to overcurrent conditions but can also lead to increased risk of nuisance tripping. It's essential to select a fuse with an appropriate fuse factor for the intended application to ensure safety and reliability.