Customized Metal Enclosed Switchgear

I. Product Overview

The XL-21 series indoor enclosed low-voltage power distribution cabinets are standardized complete sets of equipment that comply with national and industry standards and are suitable for a wide range of low-voltage power distribution scenarios. They are mainly used in low-voltage power distribution systems with an alternating current of 50Hz, a rated operating voltage of 380V/660V, and a rated current of up to 630A. They are core supporting equipment for power supply in industrial production, civil buildings, and infrastructure.

This series of products is designed, produced, and inspected in strict accordance with national and industry standards such as GB 7251.1-2013 "Low-Voltage Switchgear and Controlgear - Part 1: Type-Tested and Partially Type-Tested Assemblies" and GB 7251.4-2017 "Low-Voltage Switchgear and Controlgear - Part 4: Special Requirements for Assemblies for Construction Sites (ACS)", ensuring that product performance is compliant and operation is reliable.

The cabinet body adopts an enclosed steel structure, which has core characteristics such as a sturdy structure, excellent protection, reasonable layout, standardized wiring, and convenient maintenance. It can be flexibly configured with various components such as circuit breakers, contactors, thermal relays, current/voltage transformers, intelligent meters, frequency converters, soft starters, and reactive power compensation devices according to users' actual needs. It realizes integrated functions such as power distribution, equipment control, line protection, operation monitoring, metering management, and remote linkage. It is widely applicable to various scenarios such as industrial and mining enterprises, civil buildings, infrastructure, computer rooms, and construction sites. It is one of the most widely used, technically mature, and cost-effective standardized complete sets of equipment in the field of low-voltage power distribution.

Core positioning of the product: With "safety and reliability, flexible adaptation, convenient operation and maintenance, and high cost performance" as the core, it meets the diverse needs of low-voltage power distribution and equipment control in different scenarios, provides stable, safe, and efficient power supply guarantee for various loads, and reduces users' initial investment and later operation and maintenance costs.

II. Core Structure and Detailed Features

(1) Cabinet Structure: Sturdy and Durable, with Proper Protection

Material and Process: The cabinet body is made of high-quality cold-rolled steel plates with a thickness of 1.5~2.0mm, formed by CNC bending and precision welding (or modular assembly). The frame structure is stable with high mechanical strength, capable of withstanding short-circuit electrodynamic impact and long-term load pressure, and is not easy to deform or rust. The surface undergoes three refined treatments: "pickling → phosphating → electrostatic spraying". The spraying layer has strong adhesion, scratch resistance, wear resistance, corrosion resistance, and rust resistance, which can effectively resist the erosion of dust, moisture, and oil stains in industrial environments, and the service life can reach more than 15 years.

Enclosed Protection Design: It adopts a fully enclosed indoor structure. The cabinet door fits closely with the cabinet body and is equipped with a special sealing rubber strip, effectively preventing dust and foreign objects from entering (meeting IP30 and above protection levels, which can be upgraded to IP40 according to needs). At the same time, the live area and the operating area are strictly isolated. The cabinet door is equipped with an anti-theft door lock to prevent non-professionals from misoperation and accidental contact with live parts, fundamentally improving the safety of equipment operation.

Cabinet Size and Installation: The standard cabinet size can be customized according to actual needs. The conventional sizes (height × width × depth) are 1800×800×600mm, 2000×1000×800mm, etc., which are suitable for different distribution room spaces. It adopts the indoor floor-mounted installation method, with fixed installation holes at the bottom, which can be firmly connected to the ground and foundation channel steel, making installation convenient. At the same time, sufficient ventilation gaps are reserved to ensure heat dissipation effect.

(2) Internal Layout: Scientific Zoning, Standardized Wiring

Zoning Design: The cabinet is scientifically divided into four independent areas with a clear layout and no mutual interference, effectively improving operation stability and maintenance convenience:

Busbar Area: Located at the top of the cabinet, connected by copper bars (or aluminum bars). The busbar specifications are matched according to the rated current, with sufficient phase-to-phase distance and proper surface insulation treatment to avoid short-circuit hazards.

Component Installation Area: Located in the middle of the cabinet, centrally installing core components such as circuit breakers, contactors, and thermal relays. The mounting plate is adjustable to adapt to components of different specifications.

Wiring Area: Located at the lower part of the cabinet, with sufficient wiring space reserved, equipped with terminal blocks and wire number tubes. The wiring is standardized, neat, and orderly, facilitating wiring, debugging, and fault.

Inlet and Outlet Area: Located at the top or bottom of the cabinet, with reserved cable inlet and outlet channels and fixing clips, facilitating connection with cable trays and cable trenches, and avoiding cable pulling and wear.

Wiring and Heat Dissipation: Flame-retardant copper core cables are used for wiring, with wire diameters matching load requirements. The wiring is firm with low contact resistance to avoid heat generation hazards. Natural ventilation channels are reserved in the cabinet, and components are arranged reasonably to ensure smooth air circulation, which can effectively dissipate heat generated during equipment operation, ensuring long-term stable operation of components and avoiding faults caused by overheating.

Clear Identification: All components, terminals, and lines in the cabinet are marked with clear identifiers, including component models, line numbers, and usage instructions, facilitating daily inspection, maintenance, and fault排查, and reducing the difficulty of operation and maintenance.

(3) Operation and Maintenance: Convenient and Efficient, Reducing Costs

Front Operation and Front Maintenance: The opening angle of the cabinet door can reach more than 120°. All operations, wiring, debugging, and maintenance can be completed in front of the cabinet, without the need to reserve side or rear maintenance space, greatly improving the space utilization of the distribution room and reducing the operation difficulty of maintenance personnel.

Convenient Operation Design: The operation panel centrally arranges circuit breaker operating handles, transfer switches, indicator lights, meters, etc., making operation intuitive and convenient. The cabinet door is equipped with an observation window, through which the operation status of components in the cabinet can be directly viewed, and daily inspection can be completed without opening the cabinet door.

Easy Component Replacement: Components are installed in a modular manner with simple fixing methods. Replacement can be completed quickly without disassembling too many lines, reducing downtime and improving operation and maintenance efficiency.

(4) Scalability and Customization: Flexible Adaptation to Meet Diverse Needs

Reserved Expansion Space: Sufficient installation space and terminals are reserved inside the cabinet. According to users' later needs, branches can be flexibly added, and intelligent meters, protection modules, frequency converters, soft starters, reactive power compensation devices, etc. can be installed without replacing the cabinet, reducing later upgrade costs.

Customized Configuration: Personalized configuration schemes can be customized according to users' load types, control methods, protection requirements, installation environments, etc. For example: motor control types can be configured with star-delta starting, frequency conversion starting, soft starting, and other circuits; metering types can be configured with multi-functional intelligent electric energy meters to achieve accurate electric energy metering; remote control types can be configured with communication modules to achieve remote monitoring and control.

Flexible Inlet and Outlet: It supports various inlet and outlet modes such as upper inlet and upper outlet, upper inlet and lower outlet, lower inlet and lower outlet, etc., which can be flexibly selected according to on-site cable layout and bridge position, adapting to different construction scenarios and improving construction efficiency.

III. Core Functions and Application Value

(1) Core Functions

Power Distribution Function: Safely and stably distribute the electric energy from the upper-level power supply (such as low-voltage distribution cabinets, transformers) to each branch load (such as motors, fans, water pumps, lighting equipment, office equipment, etc.), realizing reasonable scheduling and efficient utilization of electric energy.

Line and Equipment Protection Function: Equipped with complete protection components to achieve all-round protection and avoid damage to lines and equipment:

Short-Circuit Protection: Quickly cut off short-circuit current through circuit breakers to prevent the expansion of short-circuit accidents and protect lines and equipment.

Overload Protection: Prevent equipment from long-term overload operation through thermal relays or the overload protection function of circuit breakers, extending the service life of equipment.

Phase Loss Protection: For three-phase motor loads, a phase loss protection module is equipped to prevent the motor from burning due to phase loss operation.

Undervoltage/Overvoltage Protection: Undervoltage and overvoltage protection components can be configured to cut off the power supply in time when the grid voltage is abnormal to protect sensitive equipment.

Leakage Protection (Optional): For humid environments or scenarios with high personal safety requirements, leakage protectors are configured to prevent electric shock.

Motor Control Function: According to the motor type and control requirements, various motor controls can be realized:

Direct Starting: Suitable for small motors, with simple control and low cost.

Star-Delta Starting: Suitable for large and medium-sized motors, reducing starting current and protecting motors and power grids.

Forward and Reverse Control: Suitable for motors that need to run in both directions (such as fans, water pumps), realizing forward and reverse switching of motors.

Frequency Conversion Control/Soft Start Control (Optional): Equipped with frequency converters or soft starters to realize smooth starting and speed control of motors, reduce starting impact, and save energy consumption.

Operation Monitoring and Metering Function:

Basic Monitoring: Configure ammeters and voltmeters to display the voltage and current of each branch in real-time, facilitating daily inspection and timely detection of voltage and current abnormalities.

Accurate Metering: Active energy meters, reactive energy meters, and multi-functional intelligent meters can be configured to realize accurate metering of electric energy consumption and provide data support for energy consumption management.

Status Feedback: Equipped with running indicator lights and fault indicator lights to intuitively display the operation status of equipment (running, stopping, fault), facilitating quick fault排查.

Remote Control and Automatic Linkage (Optional): PLC and communication modules (such as Modbus, 485 communication) can be configured to realize remote start and stop of equipment, remote monitoring of operating parameters, and remote fault alarm. It can be seamlessly connected to factory automation systems and building automation systems to realize unattended operation and improve management efficiency.

Reactive Power Compensation Function (Optional): Integrate capacitor banks and reactive power compensation controllers to realize reactive power compensation, improve the power factor of the power grid, reduce line losses, save electric energy, and improve the power supply quality of the power grid.

(2) Application Value

Ensure Stable Power Supply: Complete protection functions and stable structural design ensure long-term continuous operation of equipment, reduce power outage faults, and provide reliable power supply guarantee for loads.

Improve Safety Level: Enclosed protection, misoperation protection, and all-round line protection eliminate hidden dangers of personal electric shock and equipment faults, ensuring the safety of personnel and equipment.

Reduce Operation and Maintenance Costs: Convenient operation and maintenance design, modular components, and the characteristic of no frequent maintenance reduce the investment in operation and maintenance manpower and materials, and lower the whole-life cycle cost.

Optimize Energy Consumption Management: Accurate metering and reactive power compensation functions help users grasp energy consumption conditions, reduce energy consumption losses, and realize energy conservation and consumption reduction.

Flexible and Diverse Adaptation: Customized configuration and expansion capabilities can meet the personalized needs of different scenarios and different loads, without repeated investment, and improve equipment utilization.

IV. Comprehensive Technical Parameters（customizable）

Parameter Category

Core Specifications

Detailed Description

Rated Voltage

AC 380V/660V

Suitable for China's low-voltage distribution network standards, special voltage levels can be customized according to needs

Rated Frequency

50Hz

Complies with the industrial frequency grid standard, suitable for various industrial and civil loads

Rated Current

100A, 250A, 400A, 630A

Covers all scenarios from small-scale power distribution to medium-sized industrial loads, and larger current specifications can be customized

Rated Current of Busbar

100A~630A

Copper bar/aluminum bar material, matched according to rated current, with low contact resistance and strong current-carrying capacity

Short-Circuit Withstand Capacity

10kA~35kA (1s)

Meets national standards, can withstand short-circuit current impact, and avoid equipment damage

Protection Level

IP30 (standard), IP40 (optional)

IP30: Prevents fingers from touching live parts, dust-proof; IP40: Dust-proof and splash-proof, suitable for harsher environments

Cabinet Material

High-quality cold-rolled steel plate

Thickness 1.5~2.0mm, formed by CNC bending, welding/assembly, surface pickling, phosphating + electrostatic spraying

Cabinet Size

Conventional: 1800×800×600mm, 2000×1000×800mm

Can be customized to any size according to user needs and component configuration

Installation Method

Indoor floor-mounted installation

Equipped with fixed installation holes at the bottom, which can be firmly connected to the foundation channel steel

Working Environment

Temperature: -5℃～+40℃; Humidity: ≤95% (no condensation); Altitude: ≤2000m

Enhanced configurations can be customized for high-altitude, high-humidity, and low-temperature environments

Operation Method

Manual operation, electric operation (optional)

Manual operation is convenient, and electric operation can realize remote control

Executive Standard

GB 7251.1-2013, GB 7251.4-2017

Fully complies with national and industry standards, passed type tests and factory inspections

Service Life

≥15 years

Under normal operation and regular maintenance, the service life can reach more than 15 years

V. Core Product Advantages (Differentiated Highlights)

(1) Safe and Reliable, Risks Controllable

Strong Compliance: Strictly designed and produced in accordance with national and industry standards, passed a full set of type tests and factory inspections, product quality is guaranteed, and can successfully pass the acceptance of power departments and supervision units.

All-Round Protection: Enclosed structure + IP30 and above protection levels, effectively preventing dust, false touch, and foreign object intrusion; complete protection functions such as short circuit, overload, phase loss, undervoltage, etc., fundamentally eliminating hidden dangers of equipment failure and personal safety.

Stable Structure: High-quality cold-rolled steel plate cabinet + precision welding process, high mechanical strength, can withstand short-circuit electrodynamic impact, not easy to deform or rust, and stable and reliable operation.

(2) Flexible Adaptation, Strong Customization

Flexible Configuration: According to load types, control methods, and protection requirements, components such as circuit breakers, contactors, frequency converters, and intelligent meters can be freely combined to adapt to diverse needs.

Size Customization: The cabinet size can be customized as needed to adapt to different distribution room spaces without additional site modification.

Function Expansion: Sufficient expansion space is reserved, and branches, intelligent modules, reactive power compensation devices, etc. can be flexibly added in the later stage, reducing upgrade costs.

Flexible Inlet and Outlet: A variety of inlet and outlet modes are available to adapt to different on-site construction scenarios and improve construction efficiency.

(3) Convenient Operation and Maintenance, Controllable Costs

Front Operation and Front Maintenance: All operations and maintenance can be completed in front of the cabinet, without the need to reserve extra space, reducing the difficulty of operation and maintenance.

Modular Design: Components are installed in a modular manner, easy to replace, reducing downtime and improving operation and maintenance efficiency.

No Frequent Maintenance: Core components are selected from high-quality brands, with stable operation. Under normal circumstances, only regular appearance inspections are required, without frequent disassembly and maintenance, reducing operation and maintenance manpower and material costs.

Clear Identification: Complete identification of components and lines in the cabinet, facilitating daily inspection and fault排查, and shortening fault handling time.

(4) High Cost Performance, Wide Universality

Mature and Reliable: The product has mature technology, wide application cases, has been verified by the long-term market, and has a low operation failure rate.

Solid Materials: High-quality materials + refined craftsmanship, long service life, and low comprehensive use cost.

Strong Universality: Suitable for various low-voltage power distribution scenarios such as industrial, civil, and infrastructure, without the need for separate design for different scenarios, reducing initial investment.

Good Interchangeability: Standardized component configuration, strong interchangeability, convenient later component replacement, no need for additional customization.

(5) Intelligent Upgrade, Adapting to the Future

Intelligent Expansion: Can be configured with intelligent meters, communication modules, PLC, etc., to realize remote monitoring, remote control, and fault alarm, adapting to the needs of intelligent power distribution and unattended operation.

Energy Consumption Optimization: Can integrate reactive power compensation devices to improve power factor, reduce energy consumption, and comply with energy conservation and consumption reduction policies.

Strong Compatibility: Can be seamlessly connected to factory automation systems and building automation systems to realize linkage control with other equipment, adapting to the trend of intelligent development.

VI. Applicable Scenarios (Full Scene Coverage)

(1) Industrial Field

Factory Workshops: Power distribution and control of power equipment such as fans, water pumps, air compressors, machine tools, production lines, and conveyor belts.

Mining/Metallurgy: Power distribution for mining machinery and metallurgical production lines, suitable for high-dust and high-vibration environments.

Light Industry/