The classification of low-voltage switchgear is explained from two aspects: 1. From the perspective of structural mode; 2. From the perspective of connection methods, the following editor will provide a detailed introduction! From the perspective of structural mode, it can be divided into fixed type and withdrawable type.

1、固定式：

1. Fixed:

能满足各电器元件可靠地固定于柜体中确定的位置。柜体外形一般为立方体，如屏式、箱式等，也有棱台体如台式等。这种柜有单列，也有排列。

It can ensure that all electrical components are reliably fixed in the designated position in the cabinet. The appearance of the cabinet is generally cubic, such as screen type, box type, etc., and there are also prismatic platforms such as desktop. This type of cabinet has a single row and also an arrangement.

2、抽出式：

2. Withdrawal type:

抽出式是由固定的柜体和装有开关等主要电器元件的可移装置部分组成，可移部分移换时要轻便，移入后定位要可靠，并且相同类型和规格的抽屉能可靠互换，抽出式中的柜体部分加工方法基本和固定式中柜体相似。

The withdrawable type is composed of a fixed cabinet body and a movable device part equipped with main electrical components such as switches. The movable part should be light and reliable when moved in, and drawers of the same type and specification can be reliably interchanged. The processing method of the cabinet body in the withdrawable type is basically similar to that in the fixed type.

但由于互换要求，柜体的精度必须提高，结构的相关部分要有足够的调整量，于可移装置部分，要既能移换，又要可靠地承装主要元件，所以要有较高的机械强度和较高的精度，其相关部分还要有足够的调整量。

However, due to the requirements for interchangeability, the accuracy of the cabinet body must be improved, and the relevant parts of the structure must have sufficient adjustment. As for the movable device part, it must be able to be replaced while reliably supporting the main components. Therefore, it must have high mechanical strength and accuracy, and the relevant parts must also have sufficient adjustment.

从连接方式上分：焊接式、紧固件连接

From the connection method, it can be divided into welding type and fastener connection

1、焊接式：

1. Welding type:

它的优点是加工方便、坚固可靠；缺点是误差大、易变形、难调整、欠美观，而且工件一般不能预镀。

Its advantages are convenient processing, sturdy and reliable; The disadvantages are large errors, easy deformation, difficulty in adjustment, and lack of aesthetics, and the workpiece generally cannot be pre plated.

2、紧固件连接：

2. Fastener connection:

它的优点是适于工件预镀，易变化调节，易美化处理，零部件可标准化设计，并可预生产库存，构架外形尺寸误差小。缺点是不如焊接坚固，要求零部件的精度高，加工成本相对上升。紧固件一般都为标准件，其种类主要有常规的螺钉、螺母和铆钉、拉铆钉，以及预紧而可微调的卡箍螺母和预紧的拉固螺母，还有自攻螺钉等。也有专用紧固螺钉（如国外引进的低压柜大多用专用紧固螺钉）。

Its advantages are suitable for pre plating of workpieces, easy to change and adjust, easy to beautify, standardized design of components, and pre production inventory. The overall size error of the structure is small. The disadvantage is that it is not as sturdy as welding, requiring high precision of components and relatively high processing costs. Fasteners are generally standard components, mainly including conventional screws, nuts and rivets, pull rivets, pre tensioned and adjustable clamp nuts and pre tensioned pull nuts, as well as self tapping screws. There are also special fastening screws (such as most low-voltage cabinets imported from abroad use special fastening screws).

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