An electrical assembly is provided for selectively operating a household appliance in a demonstration mode or a standard mode. A logic unit (2) is adapted to control the electrical and/or electronic components of the household appliance (1), and to make the household appliance (1) perform a standard mode or a demonstration mode. A power supply device (5), external to the household appliance (1), is adapted to deliver electric power to the household appliance (1). The household appliance (1) comprises a power supply circuit (3) adapted to be connected to the power supply device (5) or directly to the supply mains (4), in order to energize the logic unit (2) and the other electrical and/or electronic components of the household appliance (1). The household appliance (1) further comprises a detection device (9) adapted to detect if the power supply circuit (3) is connected to the power supply device (5) or directly to the supply mains (4). The logic unit (2) is configured to enable the performing of the demonstration mode if the detection device (9) detects that the power supply circuit (3) is connected to the power supply device (5), and to enable the performing of the standard mode if the detection device (9) detects that the power supply circuit (3) is connected directly to the supply mains (4).