Abstract: A riser card is disclosed. The riser card includes a circuit board that has two sides, two longitudinal edges extending along a length of the board, and two orthogonal edges extending along a width of the board. The card also includes a first bus connector along one of the longitudinal edges; a second bus connector on one side of the board extending substantially parallel to the longitudinal edges; and a third bus connector on the other side of the board extending substantially parallel to the orthogonal edges. The second bus connector is configured to connect an add-on unit to the card so that the add-on unit extends substantially perpendicular from the board. The third bus connector is configured to connect an add-on unit to the card so that the add-on unit extends substantially parallel to the board and the first edges.

Abstract: The present invention is to provide a power socket with over-current protection, which includes a shape-memory alloy plate formed with a through-opening cut therethrough and an extension plate having an end connected with an inner edge of the through-opening and other end extended away from the inner edge of the through-opening so as to form a free end; and a metal spring clip having an end connected with the free end by lap joint and other end connected with other end of the shape-memory alloy plate by lap joint in a location corresponding to the inner edge of the through-opening. When a movable contact disposed on the free end is electrically in contact with a fixed contact and the shape-memory alloy plate withstands over-current to have a temperature exceeding a predetermined temperature, the end of the shape-memory alloy plate is deformed to separate the movable contact and the fixed contact.