Why does fuse rating not coincide with max power of device?
Running 2A through a 2A fuse will significantly shorten its life. Also, many &quot;2A&quot; devices will have inrush currents or spikes that exceed 2A for short periods.
Fuses are a safety device, not a current limiter. They're really only intended to blow if the device short-circuits, to prevent excessive current in the device itself from starting a fire or electrocuting the user if the case becomes live.