With a fully insulated and enclosed primary circuit, IP67 stainless steel gas tank, expandable busbar system and reliable operating mechanism, the Usune 630A Gas Insulated Switchgear is suitable for industrial plants, transformer substations, ring main networks, commercial facilities and infrastructure projects where compact installation, safety and long-term reliability are important.
Different power distribution projects require different switching, protection and measurement functions. The USRM6 series allows C, F, V, M and PT modules to be combined according to the actual network design. Up to six standard functional units can be integrated into one SF6 insulation gas tank, while expandable units can be connected through fully insulated and enclosed busbar connectors.
The 630A configuration is designed for medium-voltage distribution systems requiring higher current-carrying capability. It can be configured for incoming and outgoing feeders, transformer connections, ring networks and other distribution arrangements according to the customer's electrical system.
The main busbar and primary switching components are enclosed inside a stainless steel welded gas tank with IP67 protection. This structure helps isolate internal electrical components from dust, water ingress, condensation and other external environmental influences, making the switchgear suitable for demanding installation environments.
The primary circuit is enclosed inside the gas tank and connected to external circuits through insulated bushings and fully insulated separable connectors, reducing direct exposure to energized components. The system also incorporates a pressure relief device, pressure discharge channel and mechanical interlocking system to help reduce operational risks and prevent incorrect switching operations.
Usune independently develops and designs the spring operating mechanism for the USRM6 series. The mechanism is controlled through design, manufacturing and run-in commissioning processes to improve mechanical consistency, operating stability and long-term reliability.
The C unit is designed for load switching and distribution control. It is suitable for incoming and outgoing feeder applications and ring network systems where reliable load switching is required.
The F unit combines a load break switch with fuses to provide switching and protection functions. It is particularly suitable for transformer feeder applications requiring compact protection equipment.
The V unit uses a circuit breaker for applications requiring comprehensive switching and protection functions. It is suitable for feeders and distribution points where circuit interruption and protection coordination are important.
The M unit provides a dedicated configuration for electrical measurement and metering requirements. It can be integrated with other functional modules to create a complete medium-voltage distribution system.
The PT unit is designed for busbar voltage measurement and related monitoring requirements. It can be combined with other modules according to the electrical system design.
| 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 |
The main advantage of the USRM6 series is its ability to adapt to different distribution network structures. Customers can use C units for load switching, F units for transformer protection, V units where circuit breaker protection is required, and M or PT units when metering and voltage measurement are needed.
For ring main network applications, different modules can be combined to form a ring main cabinet. When future expansion is required, fully insulated and enclosed busbar connectors allow additional units to be connected without changing the basic switchgear platform.
The stainless steel gas tank provides IP67 protection, helping prevent dust and water from entering the primary equipment compartment. The enclosed structure also provides short-time protection against flooding and condensation.
This design is valuable for industrial plants, underground substations and other locations where humidity, dust or environmental contamination could affect conventional electrical equipment.
| Key Consideration | Usune 630A Gas Insulated Switchgear | Conventional Air-Insulated Switchgear |
| Primary Circuit | Fully enclosed in gas tank | More exposed to surrounding environment |
| Protection | IP67 gas tank | More dependent on installation conditions |
| Configuration | C/F/V/M/PT modular combination | Usually fixed cabinet configuration |
| Expansion | Expandable insulated busbar connection | May require additional installation space |
| Installation | Compact structure | Generally requires greater clearance |
| Environmental Adaptability | Reduced influence from dust and moisture | More dependent on surrounding conditions |
| Safety | Enclosed primary circuit and mechanical interlock | Protection depends on equipment structure |
For factories with multiple feeders and transformer connections, customers can combine C, F and V units according to different circuit functions. The modular structure simplifies system configuration while the enclosed primary circuit supports reliable operation in industrial environments.
Where installation space is limited, the compact gas-insulated structure allows switching, protection and metering functions to be integrated into a smaller footprint. M and PT units can be added when the project requires dedicated measurement functions.
For ring network applications, multiple functional modules can be combined to form a ring main cabinet. The expandable busbar system provides additional flexibility when the distribution network requires future expansion.
A manufacturing customer selected Usune 630A Gas Insulated Switchgear for a medium-voltage distribution upgrade. The customer focused on compact installation, reliable operation and future expansion. After application, the customer appreciated the modular C/F/V/M/PT configuration, which simplified system integration and improved space utilization.
For a ring main distribution project, the customer required flexible switching and protection functions. The USRM6 series met the requirement through expandable module combinations and insulated busbar connections. The customer recognized its stable operation, compact design and convenient system expansion capability.
A customer operating in a high-humidity environment selected Usune Gas Insulated Switchgear because of its IP67 enclosed gas tank design. The customer valued the improved protection against moisture, condensation and external contamination, helping reduce maintenance requirements.
Zhejiang Usune Electric Co.,Ltd. has established management systems according to ISO 9001 Quality Management System, ISO 14001 Environmental Management System and ISO 45001 Occupational Health and Safety Management System.
To meet different international market requirements, Usune medium-voltage switchgear products have undergone relevant IEC and GB standard type tests, with applicable products obtaining CE certification. These certifications and quality management systems support consistent manufacturing quality and provide documentation for customers during technical evaluation and project procurement.
Zhejiang Usune Electric Co.,Ltd. combines modular switchgear design, fully enclosed IP67 gas insulation, flexible functional configurations and quality management to provide reliable medium-voltage distribution solutions.
For customers purchasing 630A Electrical Panel Gas Insulated Switchgear, Usune can provide suitable configurations according to switching functions, protection requirements, metering needs, busbar arrangements and installation conditions. This allows customers to build a compact and flexible switchgear system around their actual power distribution requirements.
630A refers to the rated current configuration of the switchgear. The actual operating current, voltage level and electrical configuration should be selected according to the customer's distribution system and project requirements.
The system supports C Load Break Switch Unit, F Load Break Switch + Fuse Combination Unit, V Circuit Breaker Unit, M Metering Unit and PT Busbar PT Unit. These modules can be combined according to the required power distribution functions.
Up to six standard module units can be formed within one SF6 insulation gas tank. Expandable configurations are also available through fully insulated and enclosed busbar connectors.
The gas tank has an IP67 protection degree, helping protect the primary circuit from dust, water ingress, condensation and short-time flooding conditions.
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No. 298, Wei 17th Road, Yueqing Economic Development Zone, Yueqing, Wenzhou City, Zhejiang Province, China
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