Abstract: A back plate configured to support a circuit board includes a body. The body defines a central recess formed into a top surface thereof, and a raised main support column extending from the central recess and adapted to support the circuit board.

Abstract: A loading assembly includes a base plate configured to support a circuit board placed thereon, a pressing plate configured to press an electrical member on the circuit board, and a first connection assembly connecting the pressing plate to the base plate and pressing the electrical member on the circuit board through the pressing plate. The first connection assembly includes a first nut fixed on the base plate, a first bolt passing through the pressing plate and screwed to the first nut, and a first spring sleeved on the first bolt and compressed between a head of the first bolt and the pressing plate. A first locking part is formed on the first bolt. The first locking part is pressed against an end face of the first nut when the first bolt is screwed to an installation position to prevent the first bolt from being rotated relative to the first nut.

Abstract: A loading assembly includes a base plate configured to support a circuit board placed thereon, a pressing plate configured to press an electrical member on the circuit board, and a first connection assembly connecting the pressing plate to the base plate and pressing the electrical member on the circuit board through the pressing plate. The first connection assembly includes a first nut fixed on the base plate, a first bolt passing through the pressing plate and screwed to the first nut, and a first spring sleeved on the first bolt and compressed between a head of the first bolt and the pressing plate. A first locking part is formed on the first bolt. The first locking part is pressed against an end face of the first nut when the first bolt is screwed to an installation position to prevent the first bolt from being rotated relative to the first nut.