Schneider MNX Power Distribution Cabinet

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The Schneider MNX power distribution cabinet is a medium-voltage power distribution cabinet product under Schneider Electric. The following is a detailed introduction:

### Structural Features - **Modular Design**: It adopts the modular design concept. The cabinet structure is universal. The frame is made of 8MF open-section steel. The side panels and door panels are made of high-quality cold-rolled steel plates, which are processed and bent by CNC equipment. This design allows for the flexible combination of functional units according to different usage requirements, such as incoming line units, metering units, feeder units, etc., facilitating expansion and maintenance.

- **Good Protection Performance**: The enclosure protection level usually reaches IP4X or above, which can effectively prevent dust and foreign objects from entering. Each compartment is independent of each other and has complete protection measures to avoid personnel from accidentally touching live parts during misoperation, thus improving the safety of use.

- **Convenient Operation**: The operating mechanisms of equipment such as circuit breakers are reasonably designed. The positions of the operating handles are clear, and the operating force is moderate, which is convenient for operation and maintenance personnel to perform opening and closing operations. Meanwhile, the layout of the power distribution cabinet conforms to the ergonomic principle, facilitating operation and observation by maintenance personnel in front of the cabinet.

### Working Principle

- **Normal Operation**: When the power system is operating normally, the power supply is connected to the power distribution cabinet through the incoming line switch, and then distributed to each feeder circuit through the busbar to provide a stable power supply for the load. The circuit breaker is in the closed state, and the current passes through each electrical component normally. The monitoring instruments display the operating parameters of the circuit in real time, such as voltage, current, power, etc.

- **Fault Protection**: When faults such as overload, short circuit, and grounding occur in the circuit, the corresponding protection devices will act quickly. For example, the overcurrent protection device of the circuit breaker will detect the abnormal increase in current. When the current exceeds the set value, the circuit breaker will automatically trip to cut off the faulty circuit to protect the safety of equipment and personnel. Meanwhile, the grounding protection device will act in a timely manner when a grounding fault occurs to avoid safety accidents caused by electrical equipment leakage.

- **Control and Monitoring**: The Schneider MNX power distribution cabinet is equipped with an advanced control and monitoring system, which can realize remote control and real-time monitoring of the circuit. By connecting to the automation system, operation and maintenance personnel can remotely operate the opening and closing of the circuit breaker in the control room and view the operating status and fault information of the circuit, improving the operation management efficiency and reliability of the power system.

### Technical Parameters - **Rated Voltage**: Common rated voltages are 12kV, 24kV and other different levels, which can be selected according to specific application scenarios and power system requirements.

- **Rated Current**: According to different load requirements, there are various specifications of rated current available for selection, such as 630A, 1250A, 2000A, etc.

- **Short-Circuit Withstand Current**: It is generally between dozens of kiloamperes and hundreds of kiloamperes, for example, 25kA, 31.5kA, 40kA, etc. The magnitude of the short-circuit withstand current determines the withstand ability and protection performance of the power distribution cabinet in the event of a short-circuit fault.

### Application Scenarios

- **Industrial Field**: In various factories, it is used for power supply and control of production equipment, such as power distribution for motors, fans, pumps and other equipment to ensure the stable operation of the production process.

- **Commercial Buildings**: In places such as shopping centers, office buildings, hotels, etc., it provides reliable power distribution and protection for lighting systems, air-conditioning systems, elevators and other equipment.

- **Power System**: It can be used as a medium-voltage power distribution cabinet in substations for receiving and distributing power and realizing the control and protection of the power system.

- **Data Centers**: It provides a stable power supply and protection for servers, UPS and other equipment to ensure the normal operation of the data center and avoid data loss or equipment damage caused by power failures. The specific parameters of the Schneider MNX power distribution cabinet are as follows:

### Rated Voltage

- **Rated Voltage of the Main Circuit**: Common voltages are 400V, 690V, etc. Different application scenarios and load requirements will lead to the selection of different rated voltages.

- **Rated Voltage of the Auxiliary Circuit**: Usually 220V, 380V, etc., which are used for auxiliary circuits such as control and signal.

### Rated Current - **Rated Current of the Incoming Line Cabinet**: It depends on the actual application scenario and load demand, and is generally between 630A and 6300A. For heavy load scenarios such as large industrial plants, an incoming line cabinet with a higher rated current may be selected.

- **Rated Current of the Outgoing Line Cabinet**: It is usually between 100A and 3200A, and the specific value depends on the current demand of the connected load equipment.

### Short-Circuit Withstand Current

- **Short-Circuit Withstand Current of the Horizontal Busbar**: It is generally between 31.5kA and 80kA. The magnitude of the short-circuit withstand current reflects the withstand ability and protection performance of the power distribution cabinet in the event of a short-circuit fault.

- **Short-Circuit Withstand Current of the Vertical Busbar**: It is usually between 15kA and 65kA, and the specific value is related to the structure and design of the power distribution cabinet.

### Protection Level - The enclosure protection level generally reaches IP30 or above, such as IP40, IP54, etc. Among them, IP40 can prevent objects larger than 1mm from entering, such as mosquitoes, flies, insects, etc.; IP54 has certain dust-proof and water splash-proof capabilities on the basis of IP40.

### Internal Structure Parameters

- **Busbar System**: The busbar materials are mostly copper or aluminum, which have good electrical conductivity and heat dissipation. There are usually two ways to arrange the busbars, namely horizontal busbars and vertical busbars. The horizontal busbars are used to connect incoming and outgoing line circuits, and the vertical busbars are used to connect different functional units.

- **Functional Units**: They include incoming line units, outgoing line units, metering units, compensation units, etc. Each functional unit has corresponding electrical components and connection methods, which can be flexibly combined according to user needs.

- **Drawer Units**: The drawer units have good interchangeability and maintainability. The rated current of the drawers is generally between 100A and 630A. The pushing and pulling operations of the drawers are convenient and fast, and they have mechanical and electrical interlocking functions to ensure the safety of operations. ### Environmental Parameters

- **Working Temperature**: It is generally between -5 °C and 40 °C. Within this temperature range, the electrical components and equipment in the power distribution cabinet can work normally.

- **Relative Humidity**: The relative humidity is usually required to be between 5% and 95% without condensation to ensure the insulation performance of the power distribution cabinet and the normal operation of the equipment.

- **Altitude**: It is generally applicable to areas below 2000 meters above sea level. Excessive altitude may affect the insulation performance and heat dissipation effect of the power distribution cabinet.