The starting current of motor can become 3 to 6 times the normal
running current! That's normal for motors. The motor can
experience this high current for a period ranging from 20 to 50
seconds.A fuse will not be very useful in protecting a motor from this
type of overload condition. A selected fuse large enough to
permit passage of the necessary starting current would give
little or no protection against overheating of the windings under
normal running load conditions. The same case happ.