24kv 33kv Sf6 Gis Gas Insulated Switchgear is particularly suitable for underground facilities, coastal areas, plateau regions, urban substations, and other locations where installation space or environmental conditions are challenging. The enclosed construction also provides a compact equipment footprint, making it easier for project designers to integrate medium-voltage distribution equipment into substations and secondary transformer stations.
Power distribution projects rarely have identical circuit requirements. A compact switchgear system therefore needs configuration flexibility rather than relying on a single fixed arrangement. The USRM6 series adopts a modular design that can be configured with different functional units, including C for load break switch units, F for combination units, and V for circuit breaker units.
Standard module units and fixed combination module units can be selected according to the electrical scheme. An expandable main bus configuration is also available, allowing multiple modules to be combined into different switchgear arrangements. This modular approach helps engineering teams adapt the equipment to different feeder, transformer, protection, isolation, and distribution requirements.
Conventional outdoor electrical equipment can be exposed to dust, moisture, pollution, temperature changes, and other environmental conditions. These factors may increase inspection and maintenance requirements during equipment operation.
The sealed gas-insulated structure of the USRM6 series separates the main circuit from the external environment. This reduces direct exposure of internal electrical components to environmental contamination and supports a low-maintenance operating concept.
For projects where equipment access is difficult, such as underground substations, compact urban installations, or remote infrastructure, reduced routine maintenance can be an important consideration during equipment selection.
The SF6 C-GIS configuration is designed to support more than basic circuit switching. Depending on the selected module arrangement, the system can integrate switching, circuit protection, electrical isolation, measurement, monitoring, grounding, communication, and control functions.
The combination of different functional modules allows the switchgear configuration to match the protection and distribution architecture of the project. This provides engineering contractors and system integrators with greater flexibility when developing medium-voltage distribution systems.
The operating environment should be evaluated carefully before selecting medium-voltage GIS equipment. The USRM6 series is designed for an altitude of up to 4000 m, a maximum ambient temperature of +50°C, a minimum ambient temperature of -40°C, and a 24-hour average temperature not exceeding 35°C.
The relative humidity can reach 95% within 24 hours and 90% on a monthly average basis. The installation environment should not contain explosive or corrosive gases or severe mechanical shock or impact, and the contamination level should not exceed Level III according to GB/T5582. The specified anti-shock level is 9 degree.
For installations at altitudes above 1000 m, customers should notify the manufacturer so that the charging pressure can be adjusted appropriately. Special environmental conditions should be confirmed between the manufacturer, supplier, and final user before equipment selection. For example, when equipment is installed above 2000 m, the overvoltage condition inside the cabinet may need to be addressed through appropriate adjustment of gas pressure.
Underground substations often have strict limitations on available floor area and ventilation conditions. The compact enclosed structure of GIS equipment allows designers to make better use of restricted installation space while reducing the direct influence of the surrounding environment. This makes the configuration suitable for projects where electrical distribution equipment needs to be integrated into compact substations or secondary transformer stations.
Industrial and mining sites may require reliable medium-voltage switching and protection for motors, transformers, feeders, and distribution networks. The enclosed configuration can help protect internal electrical components from external contamination while providing switching, protection, isolation, and monitoring functions required by the electrical distribution system.
Railway stations, railway infrastructure, airports, and associated facilities require stable power distribution across multiple loads. Modular switchgear can be configured for different feeder and protection requirements within a centralized electrical distribution system, helping system integrators develop compact medium-voltage solutions for transportation infrastructure.
Space is often limited in downtown areas and residential districts. Compact gas-insulated equipment can be integrated into substations and distribution facilities where conventional switchgear may require a larger installation area. The enclosed structure also helps reduce the influence of external environmental conditions on the main circuit.
High humidity, salt contamination, altitude, and temperature variations can influence conventional electrical equipment. The enclosed main circuit of the USRM6 series helps reduce direct environmental exposure, while project-specific service conditions can be evaluated before equipment selection to determine appropriate configuration and operating parameters.
When purchasing 24kv 33kv Sf6 Gis Gas Insulated Switchgear, buyers should evaluate the complete electrical scheme rather than selecting equipment only according to voltage level. Rated voltage, insulation requirements, circuit breaker or load break switch configuration, feeder quantity, main bus arrangement, grounding requirements, protection and measurement functions, installation altitude, ambient temperature, humidity, pollution conditions, communication requirements, and applicable IEC and GB standards should all be considered during technical evaluation.
Usune can communicate with project engineers and system integrators to determine a suitable USRM6 configuration according to the electrical diagram and site conditions.
Usune operates with structured quality management procedures covering manufacturing, inspection, and product delivery. ISO 9001 provides the quality-management framework for controlled production processes, while ISO 14001 and ISO 45001 support environmental and occupational health and safety management.
Usune supports modular configuration based on different circuit functions and distribution requirements. This is useful for EPC contractors, electrical system integrators, distributors, and project procurement teams that need switchgear configured around a specific electrical diagram.
With IEC and GB standards incorporated into the product design and CE certification available, Usune can support customers evaluating medium-voltage switchgear for different international markets. Applicable standards and certification requirements can be reviewed according to the destination country and project specification.
For GIS projects, selecting the correct configuration before production is critical. Customers can provide single-line diagrams, rated voltage requirements, feeder information, installation altitude, environmental conditions, and other technical data for configuration discussion with the Usune engineering team.
| No. | Items | Unit | Load break switch unit | combination unit | Circuit breaker unit | |
| 1 | Rated voltage | kV | 12/24 | 12/24 | 12/24 | |
| 2 | Rated frequency | Hz | 50 | 50 | 50 | |
| 3 | Rated current | A | 630 | 125 (depends on fuse current) | 630 | |
| 4 | Rated insulation level | 1min Frequency withstood pressure | kV | 42/65 | 42/65 | 42/65 |
| 48/79 | 48/79 | 48/79 | ||||
| 2/2 | 2/2 | 2/2 | ||||
| Lighting impulse withstood voltage | 75/125 | 75/125 | 75/125 | |||
| 85/145 | 85/145 | 85/145 | ||||
| 5 | Rated short circuit withstand current | kA/s | 25/4 | —— | 25/4 | |
| 6 | Rated peak withstand current | kA | 63 | —— | 63 | |
| 7 | Rated short circuit making current | kA | 63 | Limited by HV fuse | 63 | |
| 8 | Rated short circuit breaking current | kA | —— | Limited by HV fuse | 25/25 | |
| 9 | Rated transmission current | A | —— | 1700/1400 | —— | |
| 10 | Rated active load breaking current | A | 630 | —— | —— | |
| 11 | Rated closed‑loop breaking current | A | 630 | —— | 630 | |
| 12 | Mechanical life | load break switch/CB | Times | 10000 | 10000 | 20000 |
| Isolation/ground switch | 5000 | 5000 | 5000 | |||
| 13 | Circuit resistance | μΩ | ≤150 | —— | ≤150 | |
| 14 | Rated charging pressure (20℃ gauge pressure) | MPa | 0.04 | 0.04 | 0.04 | |
| 15 | Gas annual relative leakage rate | % | 0.05 | 0.05 | 0.05 | |
| 16 | IP protection degree | Cabinet | IP4X | IP4X | IP4X | |
| Gas tank | IP67 | IP67 | IP67 | |||
The USRM6 series was applied in a Cas-space rocket launch project, where reliable medium-voltage power distribution was required to support critical infrastructure and electrical loads within the launch facility. The project required switchgear capable of maintaining stable operation while fitting into a relatively compact electrical distribution environment.
For a rocket launch facility, the power distribution system needs to support critical equipment and auxiliary infrastructure with dependable switching, protection, isolation, and monitoring functions. The enclosed SF6 insulation structure of the USRM6 series helps reduce the influence of external environmental conditions on the main circuit, which is particularly valuable for specialized infrastructure with demanding operational requirements.
The modular configuration also allowed the switchgear arrangement to be adapted to the project's electrical distribution requirements. Different functional units could be combined according to the power network design, while the expandable main bus provided additional flexibility for network configuration and future system planning.
Through its compact structure, enclosed insulation, and modular design, the USRM6 series provided a suitable medium-voltage distribution solution for the Cas-space rocket launch project, supporting the facility's requirements for reliable and space-efficient electrical infrastructure.
The USRM6 series is designed with reference to applicable high-voltage switchgear and control equipment standards, including GB 3804-2004 for 3.6kV–40.5kV high-voltage AC load break switches, GB 1984-2014 for high-voltage AC circuit breakers, GB 16926-2009 for HV AC load break switch-fuse combinations, GB 1985-2014 for HV AC isolation switches and ground switches, and GB 3906-2006 for 3.6kV–40.5kV AC metal-enclosed switchgear and controlgear.
It also references GB/T 11022-2011 for common technical requirements for HV switchgear and controlgear, GB 4208-2008 for enclosure protection, GB/T 5582-1993 for pollution degree of external insulation, DL/T 404-2007 for 3.6kV–40.5kV AC metal-enclosed switchgear and controlgear, GB/T 13384-2008 for mechanical and electrical products, GB 191-2008 for packaging and transportation marks, and GB 311.1-2012 for insulation coordination in high-voltage transmission and distribution equipment.
Usune's quality and compliance framework includes ISO 9001 Quality Management System, ISO 14001 Environmental Management System, ISO 45001 Occupational Health and Safety Management System, IEC and GB standard compliance, and CE certification. Project-specific certification and applicable standards should be confirmed according to the destination market and technical specification.
The main advantage is the enclosed construction of the energized electrical components within an insulating gas environment. This enables a compact structure and reduces direct exposure of the main circuit to external environmental conditions.
The USRM6 series is designed for medium-voltage applications including 24kV and 33kV configurations. The exact rated voltage, insulation level, and configuration should be confirmed according to the project specification.
Yes. The specified service altitude is up to 4000 m. For installations above 1000 m, customers should inform Usune in advance so that appropriate gas charging pressure can be evaluated. Special requirements above 2000 m should be confirmed during technical design.
The USRM6 series uses a modular configuration concept. Load break switch units, combination units, circuit breaker units, and expandable main bus arrangements can be selected according to the required electrical scheme.
Typical applications include secondary transformer substations, industrial and mining facilities, railways, airports, urban distribution networks, residential areas, underground facilities, and locations with relatively demanding environmental conditions.
For an accurate quotation, buyers should provide the rated voltage, single-line diagram, number of feeders, required switching functions, circuit breaker or load break switch requirements, bus configuration, installation altitude, environmental conditions, protection requirements, and destination market.
For medium-voltage distribution projects requiring compact dimensions, environmental adaptability, modular configuration, and reduced maintenance requirements, the USRM6 series provides a practical gas-insulated switchgear solution.
The USRM6 series from Usune combines enclosed SF6 insulation, modular functional units, expandable bus configuration, and switching, protection, measurement, and monitoring functions. Supported by ISO 9001, ISO 14001, ISO 45001, IEC and GB standards, and CE certification, Usune provides a project-oriented solution for customers evaluating 24kv 33kv Sf6 Gis Gas Insulated Switchgear for industrial, infrastructure, urban, and specialized power distribution applications.
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