Abstract: An electric socket which is energized only upon insertion of plug contact fingers (prongs). The receptacle includes an insulative member having a leg portion on which one of the power line connectors is disposed. The insulative member is spring biased to a position wherein the connector is out of electrical contact with a contact arm connected to one of the receptacle spring arms adapted to contact the plug contact fingers. Thus, in the absence of the plug contact fingers, the receptacle is unenergized. When the plug contact fingers are inserted, they push the insulative member in a rearward direction to establish contact between the contact arm and power line connector, thereby energizing the receptacle.