Box for accommodating capacitor and rack assembly

A rack assembly, comprising:

• a cage;
• and
• a box for accommodating at least one capacitor, removably disposed on the cage, the box comprising:
• a bottom plate;
• two first side plates and two second side plates, wherein the two first side plates are disposed opposite to each other, the two second side plates are disposed opposite to each other, the two first side plates and the two second side plates are respectively connected to a plurality of side edges of the bottom plate so that the bottom plate, the two first side plates and the two second side plates together form an accommodation space;
• and
• a fixed engagement structure and a movable engagement structure, respectively connected to the two first side plates, wherein the fixed engagement structure and the movable engagement structure are located at a side of the accommodation space that is located farthest from the bottom plate, the movable engagement structure comprises a cantilever part and an engagement part, the cantilever part is connected to one of the two first side plates, the engagement part protrudes from a movable end part of the cantilever part;
• wherein the cage further comprises a main body and a plurality of fasteners, the plurality of fasteners are fixed to the main body, the box further comprises a first protruding plate, a second protruding plate and a blocking component, the first protruding plate is connected to one of the two second side plates, the second protruding plate is connected to another one of the two second side plates, the blocking component is movably connected to the another one of the two second side plates, the first protruding plate has at least one first fastening hole, the second protruding plate has a recess, the blocking component comprises a cantilever portion and a blocking portion, the cantilever portion is connected to the another one of the two second side plates, the blocking portion is connected to the cantilever portion, the blocking component is movable between a blocking position and a releasing position relative to the another one of the second side plates;
• when the blocking component is located at the blocking position, the second protruding plate and the blocking portion together form a second fastening hole, the plurality of fasteners are removably disposed in the first fastening hole and the second fastening hole;
• when the blocking component is located at the releasing position, a vertical distance between the blocking portion and the bottom plate is smaller than a vertical distance between the second protruding plate and the bottom plate.