The following are the main representative low-voltage switchgear types, their characteristics, and applications:

 Representative: GGD, XL-21 (Power Distribution Box)

 Features:

 Simple structure, low cost; components are fixedly installed inside the cabinet.

 Maintenance requires power disconnection; good safety but limited flexibility.

 Suitable for applications with stable loads and few circuits.

 Applications: Small workshops, residential power distribution, pump rooms, etc.

 Representative Models: MNS, GCS, GCK

 MNS: Modular design; drawer unit height is flexible (e.g., 1/4, 1/2, full unit); compatible with ABB technology.

 GCS: Mainstream domestic cabinet type; horizontal busbar is located on top of the cabinet; drawer push mechanism is screw-type.

 GCK: An earlier domestically produced drawer-type switchgear, with the vertical busbar located on the side of the cabinet, resulting in a relatively simple structure.

 Features:

 Drawer units can be pulled out, supporting uninterrupted circuit replacement and convenient maintenance.

 High protection level (IP30 and above), strong safety and reliability.

 Applications: Large industrial plants, data centers, hospitals, and other locations with high requirements for power supply continuity.

 Representative Models: Blokset (Schneider Electric), SIVACON (Siemens), MNS 2.0/3.0

 Features:

 Integrated intelligent monitoring system, capable of real-time monitoring of parameters such as current, voltage, power, and temperature.

 Supports remote control and fault early warning, enabling energy efficiency management.

 Applications: Modern intelligent buildings, rail transit, new energy power plants, etc.

 Representative Models: PZ30 (Lighting Distribution Box), XL-21 (Non-standard Power Box)

 Features:

 Small size, flexible installation, mostly used for terminal power distribution.

 Modular design allows for the combination of functional units such as leakage protection and circuit breakers.

 Applications: Lighting and socket circuits in residences, shops, and offices.

 Reactive Power Compensation Cabinet: Such as the GGJ and CNS series, used for power factor correction.

 Variable Frequency Control Cabinet: Integrates a frequency converter for motor speed control (such as fans and water pumps).

 Dual Power Switching Cabinet: Enables automatic switching between primary and backup power supplies, ensuring power continuity.

Selection Considerations

 Load Requirements: Select cabinet capacity based on current rating and number of circuits.

 Application Scenarios: Drawer-type cabinets are preferred in industrial environments (easy to maintain); fixed cabinets are suitable for civil buildings.

 Expandability: Reserve backup circuits or select modular cabinet types to accommodate future expansion.

 Brands and Standards: International brands (such as ABB and Siemens) offer high reliability; domestic cabinet types (such as Chint and Changshu) offer excellent cost performance.

 Modularization and Standardization: Such as "cabinet + functional module" design, shortening delivery cycles.

 Digital Integration: Integrating the Internet of Things (IoT) and cloud platforms to achieve remote operation and maintenance and energy efficiency analysis.

 Green and Energy-Saving: Employing high-efficiency components and optimized heat dissipation design to reduce losses.

 Selecting a suitable low-voltage switchgear requires comprehensive consideration of power supply requirements, space constraints, and operation and maintenance conditions. It is recommended to configure it in accordance with electrical design specifications (such as GB 7251 standard) and professional manufacturer advice.