低压抽出式开关柜适用于交流50Hz、额定绝缘电压和工作电压为400V、660V，额定电流6300A及以下三相五线制的电力供电系统，可用于发电厂、变电所、工矿企业、大楼宾馆、机场、码头以及广播电视等通信中心来作为发电、输配电、电能转换及电能消耗设备的控制，并通过电容补偿对其主母线进行无功补偿。

　　Low voltage withdrawable switchgear is suitable for three-phase five wire power supply systems with AC 50Hz, rated insulation voltage and working voltage of 400V, 660V, rated current up to 6300A and below. It can be used in power plants, substations, industrial and mining enterprises, buildings, hotels, airports, docks, and communication centers such as broadcasting and television to control power generation, transmission and distribution, energy conversion, and energy consumption equipment. It also compensates for reactive power on its main busbar through capacitor compensation.

　　1. 山东MNS低压抽屉柜框架为组合式结构，基本骨架由C型钢材组装而成。柜架的 全部结构件经过镀锌处理，通过自攻锁紧螺钉或8.8级六角螺栓坚固连接成基本柜架，加上对应于方案变化的门、隔板、安装支架以及母线功能单元等部件组装成完整的开关柜。开关柜内部尺寸、零部件尺寸、隔室尺寸均按照模数化（E=25mm）变化。

　　1. The frame of Shandong MNS low-voltage drawer cabinet is a combination structure, and the basic skeleton is assembled from C-shaped steel. All structural components of the cabinet frame have been galvanized and firmly connected to form the basic cabinet frame using self tapping locking screws or 8.8 grade hexagonal bolts. In addition, corresponding components such as doors, partitions, installation brackets, and busbar functional units have been assembled to form a complete switchgear. The internal dimensions, component dimensions, and compartment dimensions of the switchgear vary according to modularization (E=25mm).

　　2. MNS型组合式低压开关柜的每一个柜体分隔为三个室，即水平母线室（在柜后部），抽屉小室（在柜前部），电缆室（在柜下部或柜前右边）。室与室之间用钢板或高强度阻燃塑料功能板相互隔开，上下层抽屉之间有带通风孔的金属板隔离，以有效防止开关元件因故障引起的飞弧与其它线路短路造成的事故。

　　2. Each cabinet of the MNS type combined low-voltage switchgear is divided into three compartments, namely the horizontal busbar compartment (at the back of the cabinet), the drawer compartment (at the front of the cabinet), and the cable compartment (at the bottom or right side of the cabinet). The rooms are separated from each other by steel plates or high-strength flame-retardant plastic functional boards, and there are metal plates with ventilation holes between the upper and lower drawers to effectively prevent accidents caused by arcing of switch components and short circuits of other circuits due to faults.

　　3. 山东MNS低压抽屉柜的结构设计可满足各种进出线方案要求：上进上出、上进下出、下进上出、下进下出。

　　3. The structural design of Shandong MNS low-voltage drawer cabinet can meet various requirements for inlet and outlet schemes: upper inlet and outlet, upper inlet and lower outlet, lower inlet and upper outlet, and lower inlet and lower outlet.

　　4. 设计紧凑：以较小的空间容纳较多的功能单元。

　　4. Compact design: accommodates more functional units in a smaller space.

　　5. 结构件通用性强、组装灵活，以E=25mm为模数，结构及抽出式单元可以任意组合，以满足系统设计的需要。

　　5. The structural components have strong universality and flexible assembly. With E=25mm as the modulus, the structure and pull-out units can be combined arbitrarily to meet the needs of system design.

　　6. 母线用高强度阻燃型、高绝缘强度的塑料功能板保护，具有抗故障电弧性能，使运行维修可靠

　　6. The busbar is protected by high-strength flame-retardant and high insulation strength plastic functional boards, which have anti fault arc performance and ensure safe and reliable operation and maintenance

　　7. 通用化、标准化程度高，装配方便。具有可靠的质量保证

　　7. High degree of generalization and standardization, easy assembly. Having reliable quality assurance

　　主要组成部分

　　Main components

　　柜 体：开关柜的外壳骨架及内部的安装、支撑件

　　Cabinet: The outer shell skeleton and internal installation and support components of the switchgear

　　母 线：一种可与几条电路分别连接的低阻抗导体

　　Busbar: a low impedance conductor that can be connected to several circuits separately

　　功能单元：完成同一功能的所有电气设备和机械部件（包括进线单元和出线单元）

　　Functional Unit: All electrical equipment and mechanical components (including incoming and outgoing units) that perform the same function

　　母线的分类：

　　Classification of busbars:

　　主母线(水平母线）:

　　Main busbar (horizontal busbar):

　　连接一条或几条配电母线或进线和出线单元的母线

　　Connecting one or several distribution busbars or busbars for incoming and outgoing units

　　配电母线（垂直母线）：

　　Distribution busbar (vertical busbar):

　　框架单元内的一条母线，它连接在主母线上，并由它向出线单元供电。

　　A busbar within the framework unit, which is connected to the main busbar and supplies power to the outgoing unit.

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