Cabinet assembly and shelf with pitch-defined compatibility for plug-in units

A cabinet assembly, comprising:

• a cabinet;
• a shelf disposed in the cabinet and comprising a socket defining an opening;
• a stopping portion and an actuating portion arranged on an internal surface of the socket and respectively communicated with the opening;
• and
• a first plug-in unit and a second plug-in unit each configured to be inserted into the socket along a plug-in direction from the opening toward an interior of the socket,
• wherein each of the first plug-in unit and the second plug-in unit comprises:
• a main body;
• and
• an elastic arm arranged on one side of the main body,
• the elastic arm having a stopping wall configured to face the plug-in direction and an actuating slope configured to obliquely face the plug-in direction;
• wherein a first pitch is defined along the plug-in direction from the actuating portion to the stopping portion;
• wherein, for each of the first plug-in unit and the second plug-in unit, a respective second pitch is defined along the plug-in direction from the actuating slope to the stopping wall;
• wherein the second pitch of the first plug-in unit is different from the second pitch of the second plug-in unit;
• and
• wherein the first pitch is greater than or equal to the respective second pitch of each of the first plug-in unit and the second plug-in unit, such that during insertion of a corresponding plug-in unit into the socket, contact between the actuating slope and the actuating portion causes the elastic arm to deflect before the stopping wall reaches the stopping portion.