Patent ID: 7825546

Claim:
An electrical receptacle comprising a power socket, a direct current (DC) power supply, a detecting switch, a controller, and a relay, wherein the DC power supply, the detecting switch, the controller, and the relay form a circuit loop for detecting whether a power plug is inserted into the power socket; the detecting switch is placed under the power socket without any electrical connection with the power socket, and comprises an input terminal, an output terminal, a contactor, and a spring member, the contactor consists of an insulating member facing the power socket and a conducting member facing the spring member, and the spring member is placed under the contactor for bracing the contactor; the power socket comprises a naught terminal for connecting to a neutral wire directly and a live wire terminal for connecting to a live wire via a switch of the relay; wherein, when the power plug is inserted into the power socket, the contactor is pushed down and contacts the input terminal as well as the output terminal via the conducting member, the input terminal and the output terminal are electrically conducted and cause the switch of the relay to close, and the live wire terminal of the power socket connects to the live wire via the closed relay accordingly.