To prevent the damage of the electric plug of another electric appliance surely by providing a switch for an auxiliary socket connected in a row for a load and in series for the auxiliary socket.

An auxiliary socket 14 is connected to the switch 15 for the auxiliary socket in series and an ability changing switch 11, a motor 12 and a timer switch 13 are connected to the auxiliary socket 14 and the switch 15 for the auxuliary socket in a row. A electric mosquito catcher 16 is connected to the auxiliary socket 14 and ON.OFF controlled by the switch 15 for the auxiliary socket. Here, when an electric fan is used independently as an electric instrument, it is operate by turning OFF the switch 15 for the auxiliary socket and turning ON the position of the timer switch 13 and selecting the ability changing switch 11 to either one ability of 'storng, middle, weak'. Therefore, the damage of the electric plug of another electric appliance can be prevented.