低壓抽出式開關柜適用于交流50Hz、額定絕緣電壓和工作電壓為400V、660V，額定電流6300A及以下三相五線制的電力供電系統，可用于發電廠、變電所、工礦企業、大樓賓館、機場、碼頭以及廣播電視等通信中心來作為發電、輸配電、電能轉換及電能消耗設備的控制，并通過電容補償對其主母線進行無功補償。

　　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. 山東MNS低壓抽屜柜框架為組合式結構，基本骨架由C型鋼材組裝而成。柜架的 全部結構件經過鍍鋅處理，通過自攻鎖緊螺釘或8.8級六角螺栓堅固連接成基本柜架，加上對應于方案變化的門、隔板、安裝支架以及母線功能單元等部件組裝成完整的開關柜。開關柜內部尺寸、零部件尺寸、隔室尺寸均按照模數化（E=25mm）變化。

　　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型組合式低壓開關柜的每一個柜體分隔為三個室，即水平母線室（在柜后部），抽屜小室（在柜前部），電纜室（在柜下部或柜前右邊）。室與室之間用鋼板或高強度阻燃塑料功能板相互隔開，上下層抽屜之間有帶通風孔的金屬板隔離，以有效防止開關元件因故障引起的飛弧與其它線路短路造成的事故。

　　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. 山東MNS低壓抽屜柜的結構設計可滿足各種進出線方案要求：上進上出、上進下出、下進上出、下進下出。

　　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. 設計緊湊：以較小的空間容納較多的功能單元。

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

　　5. 結構件通用性強、組裝靈活，以E=25mm為模數，結構及抽出式單元可以任意組合，以滿足系統設計的需要。

　　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. 母線用高強度阻燃型、高絕緣強度的塑料功能板保護，具有抗故障電弧性能，使運行維修可靠

　　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、標準化程度高，裝配方便。具有可靠的質量保證

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

　　主要組成部分

　　Main components

　　柜 體：開關柜的外殼骨架及內部的安裝、支撐件

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

　　母 線：一種可與幾條電路分別連接的低阻抗導體

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

　　功能單元：完成同一功能的所有電氣設備和機械部件（包括進線單元和出線單元）

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

　　母線的分類：

　　Classification of busbars:

　　主母線(水平母線）:

　　Main busbar (horizontal busbar):

　　連接一條或幾條配電母線或進線和出線單元的母線

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

　　配電母線（垂直母線）：

　　Distribution busbar (vertical busbar):

　　框架單元內的一條母線，它連接在主母線上，并由它向出線單元供電。

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

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