The Usune 24kV Gas Insulated Switchgear is available with different functional units to match specific distribution requirements. The C unit is a Load Break Switch Unit for load switching and distribution control, the F unit is a Load Break Switch-Fuse Combination Unit for transformer and feeder protection, and the V unit is a Circuit Breaker Unit for applications requiring advanced switching and protection functions.
With its compact enclosed structure, flexible functional configuration and reliable insulation performance, Usune provides a practical solution for customers looking to improve power distribution safety while reducing installation space.
The sealed gas-insulated design places the main electrical components inside an enclosed cabinet, reducing their exposure to dust, humidity and external contamination. This compact structure helps optimize installation space and is particularly suitable for substations, industrial plants and urban distribution projects where available space is limited.
Usune 24kV Gas Insulated Switchgear supports different functional configurations according to distribution network requirements. The C unit uses a Load Break Switch for reliable load switching, the F unit combines a load break switch with fuses for transformer and feeder protection, while the V unit uses a circuit breaker for applications requiring more comprehensive switching and protection capabilities.
The switchgear is designed for ambient temperatures from -40°C to +50°C, with a 24-hour average temperature not exceeding 35°C. It can be used at altitudes up to 4,000 m, while special attention should be given to gas charging pressure when the equipment is installed above 1,000 m. For high-altitude installations, the final configuration should be confirmed with Usune according to the actual operating conditions.
The enclosed structure helps reduce the influence of environmental contamination on internal components, which can simplify routine equipment management. This makes the switchgear suitable for customers who need reliable medium-voltage equipment with reduced maintenance workload.
The standard service altitude is up to 4,000 m. When the equipment is installed at an altitude higher than 1,000 m, the charging pressure can be adjusted according to the actual installation altitude. For installations above 2,000 m, special consideration should be given to reduced atmospheric pressure and the resulting insulation requirements.
The equipment is designed for an ambient temperature range of -40°C to +50°C, with the average temperature over 24 hours not exceeding 35°C. This wide operating temperature range allows the switchgear to serve both cold-region and hot-climate applications when the overall project conditions meet the specified requirements.
The relative humidity is designed for conditions of no more than 95% within 24 hours and no more than 90% on a monthly basis. The installation environment should also be free from explosive or corrosive gases that could adversely affect the equipment.
The switchgear should be installed in locations without explosive or corrosive gases or severe shock and impact. The environmental contamination level should not exceed Level III according to GB/T 5582. Special operating conditions should be communicated to the manufacturer before production so that the appropriate equipment configuration can be confirmed.
The C unit is designed for medium-voltage load switching and distribution control. It provides a practical configuration for feeder and network applications where reliable load switching is required without the need for a circuit breaker-based protection arrangement.
The F unit combines a load break switch with fuses to provide switching and protection functions. It is particularly suitable for transformer feeder applications where compact equipment and effective short-circuit protection are required.
The V unit uses a circuit breaker for applications requiring more comprehensive switching and protection functions. It is suitable for medium-voltage distribution systems where circuit interruption and protection coordination are important requirements.
| 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 withstand voltage‑Inter phase, ground | kV | 42/65 | 42/65 | 42/65 |
| Rated insulation level‑1min Frequency withstand voltage‑isolating distance | kV | 48/79 | 48/79 | 48/79 | |
| Rated insulation level‑1min Frequency withstand voltage‑Controlling and auxiliary circuit | kV | 2/2 | 2/2 | 2/2 | |
| Rated insulation level‑Lighting impulse withstand voltage‑Inter phase, ground | kV | 75/125 | 75/125 | 75/125 | |
| Rated insulation level‑Lighting impulse withstand voltage‑isolating distance | kV | 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 |
| Mechanical life‑Isolation/ground switch | Times | 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 | |
| IP protection degree‑Gas tank | IP67 | IP67 | IP67 |
Usune 24kV Gas Insulated Switchgear can be used in industrial plants where reliable medium-voltage switching and protection are essential for continuous production. The compact enclosure helps optimize electrical room space, while the C, F and V configurations allow the equipment to be matched with different feeder and transformer requirements.
The F and V units can be configured for transformer and feeder applications where protection and switching functions need to be integrated into a compact medium-voltage system. The enclosed design also helps protect internal components from environmental contamination.
Urban substations, commercial facilities and infrastructure projects often have strict requirements for equipment size and operational reliability. The compact design of Usune 24kV Gas Insulated Switchgear makes it suitable for projects where installation space is limited and reliable medium-voltage distribution is required.
Gas Insulated Switchgear uses an enclosed and compact structure, allowing the required switching and protection functions to be integrated into a smaller installation footprint. Traditional air-insulated switchgear generally requires greater electrical clearances, resulting in higher space requirements.
The enclosed structure of Usune Gas Insulated Switchgear reduces direct exposure of internal electrical components to dust, humidity and external contamination. Traditional air-insulated equipment is more dependent on the surrounding installation environment and may require additional environmental protection in demanding locations.
The C, F and V units allow customers to select different switching and protection functions according to their distribution requirements. This modular approach provides greater flexibility than using a single fixed switchgear configuration for different applications.
Usune 24kV Gas Insulated Switchgear is designed with reference to applicable Chinese standards for medium-voltage switchgear and electrical equipment, including GB 3804-2004 for high-voltage AC load break switches, GB 1984-2014 for high-voltage AC circuit breakers, GB 16926-2009 for high-voltage AC load break switch-fuse combinations and GB 1985-2014 for high-voltage AC isolation and grounding switches.
The equipment also references GB 3906-2006 for 3.6kV–40.5kV AC metal-enclosed switchgear and controlgear, GB/T 11022-2011 for common technical requirements of high-voltage switchgear and controlgear, GB 4208-2008 for enclosure protection, GB/T 5582-1993 for external insulation pollution levels and DL/T 404-2007 for AC metal-enclosed switchgear and controlgear.
Other applicable requirements include GB/T 13384-2008 for mechanical and electrical product technical conditions, GB 191-2008 for packaging and transportation markings and GB 311.1-2012 for insulation coordination of high-voltage transmission and distribution equipment. The final applicable standards should be confirmed according to the product configuration and target market.
Usune medium-voltage switchgear has been applied in industrial projects such as chemical plants and manufacturing facilities. Customers focus on stable operation, compact installation and reliable protection performance. The sealed gas-insulated structure helps reduce the influence of dust, humidity and environmental conditions, supporting long-term equipment reliability.
Usune products have been supplied for infrastructure and energy-related projects, including hydropower stations, oil storage facilities and transportation projects. Customers value the flexible C, F and V functional configuration, which allows the switchgear to be adapted for different switching, protection and distribution requirements.
Based on project applications, customers mainly appreciate Usune switchgear for its compact design, reliable insulation performance, flexible configuration and low maintenance requirements. The modular structure helps customers select suitable solutions according to different medium-voltage distribution systems.
Zhejiang Usune Electric Co.,Ltd. has established a comprehensive quality management system according to ISO 9001 Quality Management System, ISO 14001 Environmental Management System and ISO 45001 Occupational Health and Safety Management System.
To meet different market requirements, Usune 24kV Gas Insulated Switchgear has passed relevant IEC and GB standard type tests and obtained CE certification. The products are manufactured under strict quality control procedures to support reliable performance, safety and compliance for global medium-voltage power distribution applications.
The specified ambient temperature range is -40°C to +50°C, with an average temperature over 24 hours of no more than 35°C.
The specified relative humidity is no more than 95% within 24 hours and no more than 90% on a monthly basis. The equipment should be installed in an environment without explosive or corrosive gases and within the specified pollution level.
Yes. The C, F and V functional units can be selected according to the customer's distribution network, switching and protection requirements. For special operating environments, customers should provide the relevant conditions before ordering so Usune can evaluate the appropriate configuration.
The product design references applicable GB and DL/T standards, including requirements covering load break switches, circuit breakers, fuse combinations, metal-enclosed switchgear, enclosure protection, insulation coordination and general technical requirements for high-voltage switchgear.
Zhejiang Usune Electric Co.,Ltd. provides medium-voltage electrical equipment for different power distribution requirements. The 24kV Gas Insulated Switchgear combines a compact enclosed structure with flexible C, F and V functional units, allowing customers to configure equipment according to specific network requirements.
Usune also supports technical communication for special operating conditions. For applications involving high altitude, extreme temperatures or other non-standard environmental conditions, customers can provide project details before ordering so the equipment configuration and operating parameters can be properly evaluated.
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No. 298, Wei 17th Road, Yueqing Economic Development Zone, Yueqing, Wenzhou City, Zhejiang Province, China
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