MNS低压抽屉柜，全称为MNS型低压抽出式成套开关设备，是由ABB集团开发的一种采用标准模件由工厂组装的组合式低压成套开关设备。该产品符合国家标准GB7251、VDE660和ZBK36001-89《低压抽出式成套开关设备》及国际标准IEC439的规定。2024年，第50万台MNS低压成套开关设备正式下线，充分体现了该产品在全球市场的广泛应用和高度认可。MNS低压抽屉柜适用于交流50（60）Hz、额定工作电压400V或660V、额定电流5000A及以下的三相五线制电力供电系统。

MNS low-voltage drawer cabinet, also known as MNS type low-voltage withdrawable switchgear, is a combination low-voltage switchgear developed by ABB Group and assembled by the factory using standard modules. This product complies with the national standards GB7251, VDE660, and ZBK36001-89 "Low voltage withdrawable switchgear" and the international standard IEC439. In 2024, the 500000th MNS low-voltage switchgear will be officially launched, fully reflecting the widespread application and high recognition of this product in the global market. The MNS low-voltage drawer cabinet is suitable for three-phase five wire power supply systems with AC 50 (60) Hz, rated operating voltage of 400V or 660V, and rated current of 5000A and below.

在技术参数方面，MNS柜的额定绝缘电压可达690V（主回路），辅助回路电压可选AC220V、AC380V、DC110V、DC220V等多种规格。主母线额定工作电流（IP3X防护等级时）可达4000A，垂直母线额定电流可达1000A（抽出式）或2000A（拔插式）。短路耐受能力是衡量开关柜安全性能的重要指标，MNS柜主母线的额定短时耐受电流可达50kA、65kA、80kA甚至100kA（1s有效值），额定峰值耐受电流非常高可达220kA（0.1s）。外壳防护等级标准型为IP3X，也可根据需求提供IP31、IP4X、IP43等不同等级。

In terms of technical parameters, the rated insulation voltage of MNS cabinet can reach 690V (main circuit), and the auxiliary circuit voltage can be selected from various specifications such as AC220V, AC380V, DC110V, DC220V, etc. The rated working current of the main busbar (IP3X protection level) can reach 4000A, and the rated current of the vertical busbar can reach 1000A (withdrawable) or 2000A (plug-in). The short-circuit withstand capability is an important indicator for measuring the safety performance of switchgear. The rated short-time withstand current of the main busbar of the MNS cabinet can reach 50kA, 65kA, 80kA, or even 100kA (effective value for 1 second), and the maximum rated peak withstand current can reach 220kA (0.1s). The standard protection level of the shell is IP3X, and different levels such as IP31, IP4X, IP43 can also be provided according to demand.

MNS柜柜体采用25mm为模数的C型型材（即C型材）通过连接件组装而成。C型材以E=25mm为模数孔的钢板弯制而成，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。在此基础上，根据方案变化加装门、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。MNS柜结构设计紧凑，以较小的空间容纳较多的功能单元。母线采用高强度阻燃型、高绝缘强度的塑料功能板保护，具有抗故障电弧性能，使运行维修安全可靠。

The MNS cabinet body is assembled using 25mm module C-shaped profiles (i.e. C-shaped profiles) through connectors. The C-shaped profile is made by bending steel plates with E=25mm modular holes, and all structural components are galvanized. They are firmly connected to form the basic cabinet frame through self tapping locking screws or 8.8 grade hexagonal bolts. On this basis, according to the changes in the plan, install doors, partitions, installation brackets, and busbar functional units to assemble a complete switchgear. The MNS cabinet has a compact structural design, accommodating a large number of functional units in a small space. 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.

MNS型低压抽屉柜的核心优势在于其抽屉式模块化设计。抽屉单元设有工作位置、试验位置、抽出位置、隔离位置四种状态，每一位置都与主开关实现机械联锁，并可在操作手柄上挂锁，从而保证了操作的可靠性和操作人员的人身安全。抽屉规格有五种标准尺寸，均以8E（200mm）为高度基准，分别为8E/4、8E/2、8E、16E和24E。其中，8E/4（高度50mm）和8E/2（高度100mm）两种小型抽屉采用阻燃型塑料和铝合金型材组成。MCC柜的有效安装高度为72E（即1800mm），非常多可装36个出线回路。双面操作柜非常多可装72个抽屉单元。

The core advantage of MNS type low-voltage drawer cabinet lies in its drawer style modular design. The drawer unit has four states: working position, testing position, extraction position, and isolation position. Each position is mechanically interlocked with the main switch and can be padlocked on the operating handle, ensuring the reliability of operation and the personal safety of operators. There are five standard sizes for drawer specifications, all based on a height of 8E (200mm), namely 8E/4, 8E/2, 8E, 16E, and 24E. Among them, the two small drawers of 8E/4 (50mm height) and 8E/2 (100mm height) are made of flame-retardant plastic and aluminum alloy profiles. The effective installation height of MCC cabinet is 72E (1800mm), and it can accommodate up to 36 outgoing circuits. The double-sided operation cabinet can accommodate up to 72 drawer units.

MNS柜的柜内布局通常分为四个隔室：水平母线隔室位于柜体后部，功能单元隔室位于柜前上部或柜前左边，电缆隔室位于相应位置，形成了清晰的功能分区。柜体结构支持多种进出线方案，包括上进上出、上进下出、下进上出、下进下出等。主母线布置于柜体中部的公用母线小室内，保证了人员的高安全性，并能有效承受系统非常高短路电流。产品使用条件要求：户内使用，海拔不超过2000m；周围空气温度不高于+40℃、不低于-5℃，24小时内平均温度不高于+35℃；相对湿度在+40℃时不超过50%，在较低温度时允许有较大的相对湿度；装置安装时与垂直面倾斜不超过5°。

The layout inside the MNS cabinet is usually divided into four compartments: the horizontal busbar compartment is located at the rear of the cabinet, the functional unit compartment is located at the upper front or left front of the cabinet, and the cable compartment is located at the corresponding position, forming a clear functional partition. The cabinet structure supports multiple inlet and outlet schemes, including upper inlet and upper outlet, upper inlet and lower outlet, lower inlet and upper outlet, lower inlet and lower outlet, etc. The main busbar is arranged in the common busbar compartment in the middle of the cabinet, ensuring high safety for personnel and effectively withstanding the highest short-circuit current of the system. Product usage requirements: indoor use, altitude not exceeding 2000m; ambient air temperature not higher than+40 ℃, not lower than -5 ℃, average temperature within 24 hours not higher than+35 ℃; The relative humidity should not exceed 50% at+40 ℃, and a higher relative humidity is allowed at lower temperatures; When installing the device, the inclination with respect to the vertical plane should not exceed 5 degrees.

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