Electronic assembly having engagement component for fixing expansion card on motherboard

An electronic assembly, comprising:

• a motherboard, comprising a main circuit board and a first connector, wherein the first connector is fixed on and electrically connected to the main circuit board;
• a first slide rail and a second slide rail, fixed on the main circuit board, wherein the first slide rail has a first engagement hole;
• an expansion card, comprising an expansion circuit board and a second connector, wherein the second connector is fixed on and electrically connected to the expansion circuit board, the expansion circuit board is disposed on the first slide rail and the second slide rail and has a first positioning recess, the second connector is plugged into the first connector of the motherboard;
• and
• at least one engagement component, comprising a connecting portion, a first movable end portion, a second movable end portion, a first protruding portion, and a second protruding portion, wherein the first movable end portion and the second movable end portion are respectively connected to two opposite sides of the connecting portion, the first protruding portion protrudes from the first movable end portion and is removably engaged with the first positioning recess of the expansion circuit board, the second protruding portion protrudes from the second movable end portion and is removably engaged with the first engagement hole of the first slide rail;
• wherein the first movable end portion protrudes from the connecting portion by a first protruding length, the second movable end portion protrudes from the connecting portion by a second protruding length, the first protruding length is smaller than the second protruding length.