when the first rotating member and the second rotating member are rotated away from the base member the connector plug is disengaged from the connector socket when the first rotating member and the second rotating member are rotated towards the base member the connector plug is inserted into the connector socket application_number US 201313931576 A description the disclosure is illustrated by way of example and not by way of limitation in the figures of the accompanying drawings in which like references indicate similar elements it should be noted that references to u201c an u201d or u201c one u201d embodiment in this disclosure are not necessarily to the same embodiment and such references mean u201c at least one u201d fig1 and 2 show an embodiment of a circuit board assembly comprising a first circuit board 10 a second circuit board 20 and a handle assembly 30 attached to the second circuit board 20 the first circuit board 10 comprises two pairs of connector sockets 12 a pair of first supporting brackets 14 and a pair of second supporting brackets 16 each of the two pairs of connector sockets 12 is located adjacent to a pair of first supporting brackets 14 each of the pair of first supporting brackets 14 comprises a main piece 143 and a pair of first supporting flanges 141 extending substantially perpendicularly from.