In some countries like the UK, the IECs also have a fuse (typically 3 or 13 amps, depending on the appliance rating and conductor sizes), but this is to mainly protect the ring circuit of the main installation (that is, prevent overloading, meltdown/fire in case of a short circuit). It is the fuse of the appliance itself, with a way lower value specified by the manufacturer, the one that will (hopefully) prevent circuitry damage.