1. The fixed partition low-voltage cabinet is equipped with plug-in switches, which are installed in an independent fixed partition small room. The switch plug-in structure separates the main body and the base. The base is fixed to the base plate, and the reverse side is convenient for connecting cables. The switch body can be unplugged with electricity for easy maintenance or replacement. This structure is suitable for the power supply output of the transformer rear panel. The contact surface between the molded case switch body and the base is large, with stable clamping and reliable contact. There is independent space for the switch, busbar, primary cable, and secondary wiring, with good ventilation and heat dissipation. The device wiring, protection, and maintenance are safe and convenient.
2. A drawer cabinet is a type of drawer unit that gathers switches, contactors, thermal relays, and other components together. The advantage of this type is that it can extract many components at once, making it easy to replace them quickly as a whole. It is generally used in multi circuit and small capacity situations, such as MCC cabinets, centralized lighting control, etc; However, due to the use of drawer connectors, the errors in the guide rails and the insertions behind them are not visible, often resulting in poor contact, especially in situations with large capacities (such as switch capacities greater than 100A), which often result in contact point heating or even burning.
3. The low-voltage cabinet feed output of data center users generally does not have components such as contactors and thermal relays, and there is no need to use drawer structure. Most of them are 250A molded case switches. Choosing a drawer cabinet not only poses safety risks (it requires long-term operation and repeated extraction before it can be reflected), but also inconvenient for heat dissipation, device wiring, protection and maintenance. The secondary terminal and the primary cable terminal are located in the same space, and the laying of data transmission lines such as multifunctional measurement surfaces will also be affected by strong electrical interference, resulting in a decrease in reliability compared to fixed and separated types. Due to the addition of a drawer structure, the economy is slightly worse than that of a fixed partition type
4. The load of the data center is relatively stable, and in order to supply power to the data center, it is generally matched at full load. It is reported that many data centers have discovered the problem of drawer cabinets not easily emitting heat during operation. In order to reduce heat, operation and maintenance personnel have chosen passive methods such as opening cabinet doors, using fans to force cooling, and even adjusting and reducing output circuits to reduce data center power. I think this is all related to the selection of drawer cabinets during the construction phase, and subsequent remedial actions are helpless.