Product Overview
The HXGN-40.5 is a three-phase, AC 50Hz or 60Hz, indoor, fixed metal-enclosed ring main unit designed for rated voltages up to 40.5kV. This switchgear is specifically engineered for ring network power distribution and dual-radial power supply systems in 40.5kV distribution networks. It offers reliable load switching, overload protection, and fault isolation capabilities, significantly improving power supply reliability and utilization rates.
The switchgear adopts a fixed, air-insulated construction with a modular functional compartment design. It is particularly suitable for industrial and commercial districts with high load density, rural township distribution networks, and compact substation installations. The fixed design provides cost-effective solutions with simple maintenance and reliable operation.

Key Features
1. Fixed Metal-Enclosed Construction
The switchgear is constructed with high-strength steel plates, forming a robust, fully enclosed structure that ensures personnel safety and equipment protection. The enclosure meets IP2X to IP4X protection ratings depending on compartment location, providing reliable protection against foreign object ingress and ensuring safe operation in various indoor environments.
2. Modular Functional Compartment Layout
The switchgear is divided into four independent functional compartments including the switch compartment housing the load switch and earthing switch, the fuse compartment for high-voltage current-limiting fuses, the operating mechanism compartment for control and indication elements, and the cable compartment for cable termination and connection. Each compartment is separated by metal partitions for enhanced safety.
3. Flexible Functional Unit Configurations
The HXGN-40.5 series offers multiple functional unit options including C-unit for load switch configurations, F-unit for load switch-fuse combination configurations suitable for transformer protection, and V-unit for vacuum circuit breaker configurations. This modular approach allows customized solutions to meet diverse application requirements. The combination unit can interrupt short-circuit currents using the fuse and subsequently trip the load switch via striker pin actuation.
4. High Safety and Reliability
The switchgear incorporates comprehensive safety features including mechanical and electrical interlocks to prevent operational errors. The load switch and earthing switch are equipped with spring-operated mechanisms for quick and reliable operation. The fault interruption capability of the combination unit provides effective transformer protection. The switchgear also features pressure relief devices for internal arc fault protection.
5. Excellent Environmental Adaptability
The switchgear is suitable for a wide range of environmental conditions with ambient temperatures ranging from minus 5 degrees Celsius to plus 40 degrees Celsius and altitudes up to 2500m above sea level. For applications in harsh environments, optional SF6 gas-insulated versions with IP67 sealed tanks are available, providing superior resistance to moisture, dust, and pollution.
6. User-Friendly Operation and Maintenance
The front panel design provides convenient access to operating handles, indicating instruments, and status indicators. Clear position indicators and mimic diagrams simplify operation and status verification. The fixed structure allows straightforward inspection and maintenance without complex procedures. The maintenance-free SF6 gas tank design, when applicable, reduces routine servicing requirements.

Technical Specifications
Rated Voltage: 40.5kV
Rated Frequency: 50Hz or 60Hz
Rated Insulation Level - Power Frequency Withstand Voltage (1 minute): 95kV (phase-to-phase and earth), 118kV (isolation break)
Rated Insulation Level - Lightning Impulse Withstand Voltage (peak): 185kV (phase-to-phase and earth), 215kV (isolation break)
Rated Current: Up to 1250A (main busbar), 630A (branch)
Rated Short-Time Withstand Current: 20kA, 25kA, 31.5kA (depending on configuration)
Rated Peak Withstand Current: 50kA, 63kA, 80kA (depending on configuration)
Rated Short-Circuit Making Capacity: 50kA, 63kA (peak)
Internal Arc Classification: IAC-AFL up to 20kA per 1 second
Protection Rating: IP2X, IP3X, IP4X (depending on compartment)
Dimensions: Varies by configuration and supplier
Circuit Breaker Type: Vacuum circuit breaker for V-unit or SF6 load switch for C-unit and F-unit
Operating Mechanism: Spring-operated mechanism with manual or electric operation
Busbar System: Single-busbar or double-busbar configurations
Cable Termination: Top or bottom cable entry and exit, field adaptable

Applications
The HXGN-40.5 switchgear is extensively used in ring network power distribution systems in urban and industrial power networks. It is also employed in dual-radial power supply applications to enhance distribution reliability for commercial districts and rural township grids. Industrial facilities including manufacturing plants, mining operations, and petrochemical facilities rely on this switchgear for reliable medium-voltage power distribution. Infrastructure projects such as airports, railway stations, and ports utilize HXGN-40.5 for power distribution and control. Renewable energy applications including photovoltaic plants and wind farms employ this switchgear for power collection and interconnection. Box-type substations and compact substation installations benefit from its compact footprint and reliable performance.

Compliance Standards
GB 3906 AC Metal-Enclosed Switchgear and Controlgear for Rated Voltages Above 3.6kV and Up to and Including 40.5kV, GB/T 11022 Common Specifications for High-Voltage Switchgear and Controlgear Standards, IEC 62271-200 High-Voltage Switchgear and Controlgear Part 200: AC Metal-Enclosed Switchgear and Controlgear for Rated Voltages Above 1kV and Up to and Including 52kV, DL/T 404 Technical Specifications for Indoor AC High-Voltage Switchgear, GB 3804 AC High-Voltage Load Switches, GB 16926 Combination Units for AC High-Voltage Load Switches and Fuses, and JB/T 8754 Technical Specifications for High-Voltage Switchgear.

Why Choose Us
Our HXGN-40.5 switchgear features flexible configuration options with C-unit, F-unit, and V-unit options to meet diverse application requirements. The robust fixed construction provides reliable performance with simplified maintenance procedures. We perform comprehensive quality control including primary and secondary wiring verification, mechanical operation tests, and high-voltage withstand tests before delivery. Customization options are available for busbar configuration, functional unit selection, and protection schemes to meet specific project requirements. Our engineering team provides professional technical support for system design, installation, and commissioning. Competitive pricing and efficient manufacturing processes ensure value for money. Comprehensive after-sales service includes installation guidance, commissioning assistance, spare parts supply, and technical support. Our switchgear products have been installed in numerous distribution projects worldwide with proven reliability and customer satisfaction.