Abstract: A mechanism structure for decoupling prong and socket type electrical connections, particularly for circuit board cards and their connections to receptacle-connectors in chassis-like housings. In one embodiment, the decoupling structure comprises a plate, a rotatable rod supported by the plate, an actuating lever attached to one end of the rod, and a cam attached along the rod. In application, the lever is pushed or pulled causing the cam to apply a force separating the circuit board from the receptacle connection so as to reduce or avoid torsional forces when disconnecting the board from the receptacle.