A 3-pin porcelain socket is a type of electrical socket that is designed to be used with a 3-pin plug. These sockets are typically used to provide power to appliances, such as toasters and kettles. The 3-pin plug is inserted into the socket, which then connects to the power source. The socket is typically made of porcelain and features two metal pins that make contact with the pins on the plug. This type of socket is usually found in homes and businesses in the UK and Europe.