Motors have a high draw on start up then lower as normal run. Similar to an electric motor that is being stressed, loaded down, as it runs will increase its electrical draw. Table saw will run at 11 amps but will pull 18 to 20+ briefly at start-up. Well pumps will act in the same manor. I know fuses as " time delay cartridge fuses" for motor circuits. The will withstand a surge as opposed to "quick acting" (typical used). Both types will be found in residential installations. Its about application.