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The Type G electrical plug has three rectangular blades in a triangular pattern and has an incorporated fuse (usually a 3 amps fuse for smaller appliances such as a computer and a 13 amps one for heavy duty appliances such as heaters). British sockets have shutters on the live and neutral contacts so that foreign objects can’t be introduced into them. In the UK, the power sockets in a house are connected by means of ring circuits, which are protected by 32 A circuit breakers. This type of wiring is rarely used outside the UK and requires the use of fused plugs. Small appliances, like mobile phone chargers, usually have a 3 A cartridge fuse inside the plug; heavy duty appliances, such as coffee makers, have a plug with a 13 amp cartridge fuse.