The Medium Voltage Vcb Panel is suitable for power plants, substations, industrial facilities, mining enterprises, commercial buildings, and other indoor medium-voltage distribution projects. Usune manufactures the equipment according to applicable IEC and GB standards and operates under ISO 9001, ISO 14001, and ISO 45001 management systems, with CE certification available for international market requirements.
The main feature of this switchgear is its withdrawable vacuum circuit breaker arrangement. Instead of permanently fixing the circuit breaker inside the cabinet, the breaker is installed on a movable trolley that can be moved between the service, test, and isolated positions according to the operating procedure.
This design provides practical advantages during inspection, replacement, and troubleshooting. Circuit breaker trolleys, PT trolleys, and isolator trolleys can be configured according to the electrical scheme, while the withdrawable structure allows maintenance personnel to access the relevant equipment without dismantling the complete cabinet.
For substations and industrial distribution systems where planned maintenance and equipment replacement need to be completed efficiently, the withdrawable design can simplify service operations and reduce the time required for equipment intervention.
Safe operation is a key purchasing consideration for medium-voltage switchgear because incorrect switching sequences can create serious electrical hazards. The KYN28 series incorporates a mechanical five-proof interlock system designed to restrict incorrect operating procedures.
The interlock structure prevents circuit breaker misoperation, prevents the trolley from being pulled or pushed under load, prevents the earthing switch from being closed when the circuit is energized, prevents the circuit from being energized while the earthing switch is closed, and prevents personnel from accidentally entering live compartments.
This mechanical interlocking arrangement provides an additional physical safety barrier during switching and maintenance operations, helping operators follow the correct operating sequence.
The Medium Voltage Vcb Panel adopts a metal-partitioned internal structure that separates the main electrical sections. The breaker compartment, busbar compartment, cable compartment, instrument and control compartment, and pressure relief section are arranged independently.
This compartmentalized construction helps limit the propagation of an internal fault and separates different electrical components during inspection and maintenance. It also makes the internal electrical layout easier for operators and maintenance personnel to understand.
The top-mounted pressure relief flaps provide a controlled path for releasing pressure in the event of an internal arc fault, helping reduce the potential impact of fault pressure on personnel and surrounding equipment.
The cabinet is designed for front-side operation and maintenance, which can be valuable when the electrical room has limited rear access. Operators can perform routine switching and maintenance procedures from the front of the equipment according to the approved operating sequence.
The front-access arrangement also helps simplify equipment room planning and can reduce the space required behind the cabinet for routine maintenance activities. A built-in condensation heater can be configured for humid environments to help reduce condensation-related risks inside the cabinet.
Different medium-voltage distribution systems require different cabinet functions. The equipment can be configured as an incoming cabinet for receiving power from the upstream network, an outgoing cabinet for supplying feeders or motors, a PT and voltage measurement cabinet, a metering cabinet, a bus sectionalizer cabinet, or an isolation cabinet.
This configuration flexibility allows EPC contractors, electrical system integrators, and industrial users to develop switchgear lineups according to the project's single-line diagram rather than adopting an identical cabinet arrangement for every application.
Power plants require reliable medium-voltage equipment for receiving, distributing, and controlling electrical power within auxiliary and distribution systems. The withdrawable VCB arrangement provides a practical solution for circuit protection and switching while allowing maintenance teams to remove or replace the breaker trolley when required.
In substations, the switchgear can be configured for incoming feeders, outgoing circuits, bus sectionalizing, voltage measurement, and other distribution functions. The compartment structure and five-proof interlocking system help support safe switching and maintenance procedures.
Factories and industrial facilities often operate multiple motors, transformers, production lines, and auxiliary electrical systems. The equipment can be configured for different feeder and motor protection requirements, providing centralized medium-voltage switching and distribution within the plant.
Mining facilities require dependable electrical distribution for motors, pumps, ventilation systems, processing equipment, and auxiliary loads. The metal-clad construction and withdrawable circuit breaker arrangement provide a practical configuration for indoor medium-voltage distribution systems.
Large commercial buildings and high-rise facilities may require medium-voltage incoming and distribution equipment within dedicated electrical rooms. Front-side operation and maintenance can help simplify equipment-room planning where installation space is limited.
The Medium Voltage Vcb Panel is available for different medium-voltage distribution requirements. Main technical parameters include:
| Item | Specification |
| Rated Voltage | 3.6kV, 7.2kV, 12kV |
| Rated Frequency | 50Hz / 60Hz |
| Rated Current | 630A, 1250A, 1600A, 2000A, 2500A, 3150A |
| Rated Short-Circuit Breaking Current | 25kA, 31.5kA, 40kA, 50kA |
| Rated Short-Time Withstand Current | 25kA/3s, 31.5kA/3s, 40kA/3s, 50kA/3s |
| Protection Degree | IP4X external enclosure, IP2X internal compartments |
| Ambient Temperature | -15°C to +40°C |
| Altitude | ≤1000m, derated for higher altitudes |
| Installation | Indoor |
The actual rated voltage, current, short-circuit capacity, cabinet arrangement, and other technical parameters should be confirmed according to the project single-line diagram and customer specification.
The equipment is designed for indoor installation with an ambient temperature range of -15°C to +40°C. The daily average relative humidity should not exceed 95%, while the monthly average should not exceed 90%.
The installation environment should be free from explosive or corrosive gases, conductive dust, and severe vibration. For installations outside the standard service conditions, technical requirements should be confirmed with Usune before production so that the appropriate configuration can be evaluated.
Usune has more than 14 years of experience in the electrical equipment field and maintains an experienced R&D team capable of developing equipment configurations according to project-specific requirements.
Quality control covers components, assembly, electrical performance, and finished products. Routine tests are conducted before equipment leaves the factory to verify product performance and ensure that the delivered switchgear meets the agreed technical requirements.
Different projects can require different current ratings, cabinet combinations, protection arrangements, and control functions. Usune provides engineering communication and configuration support based on customer single-line diagrams and technical specifications.
For standard configurations, Usune can provide a production period of approximately 15–20 days after confirmation and payment, with the actual lead time depending on configuration and order quantity.
Usune maintains product test reports and relevant technical documentation to support customer inspection, project approval, and supplier qualification procedures.
The equipment has been referenced for the Cas-space Rocket Launch Project, where medium-voltage electrical distribution equipment was required for specialized aerospace infrastructure.
Rocket launch facilities contain critical electrical loads and supporting systems that require dependable power distribution and controlled switching procedures. In this type of project, the switchgear configuration needs to consider not only electrical capacity but also operational safety, fault isolation, maintenance access, and equipment integration within the overall power distribution system.
The withdrawable vacuum circuit breaker structure and five-proof mechanical interlocking system provide a suitable configuration for controlled switching and maintenance operations. The compartmentalized cabinet structure further supports separation between the breaker, busbar, cable, and control sections.
The project reference demonstrates the applicability of Usune's medium-voltage switchgear technology to specialized infrastructure where electrical distribution reliability and operational safety are important engineering considerations.
The product is manufactured with reference to applicable IEC and GB requirements for medium-voltage switchgear and electrical equipment. Usune operates according to an ISO 9001 Quality Management System, ISO 14001 Environmental Management System, and ISO 45001 Occupational Health and Safety Management System.
The product is also available with CE certification for applicable international markets. Test reports and technical documentation can be provided according to project and customer requirements.
The standard configuration covers 3.6kV, 7.2kV, and 12kV applications. For a specific project, the rated voltage and insulation parameters should be confirmed according to the electrical system requirements.
The withdrawable trolley allows the vacuum circuit breaker to be moved between operating and isolated positions. This makes inspection, testing, replacement, and maintenance more convenient than a permanently fixed breaker arrangement.
The five-proof system is a mechanical safety interlock designed to prevent incorrect operating sequences. It helps prevent improper breaker operation, trolley movement under load, incorrect earthing switch operation, energizing an earthed circuit, and accidental access to energized compartments.
Yes. The switchgear can be arranged as incoming, outgoing, PT, metering, bus sectionalizer, or isolation cabinets according to the project's electrical configuration.
Yes. Usune supports OEM requirements such as customer logos, company names, and project-specific configurations, subject to technical and production confirmation.
For standard configurations, the typical production period is around 15–20 days after payment and technical confirmation. The actual lead time depends on the product configuration, quantity, and project requirements.
Usune conducts quality inspection from components through final assembly and performs routine tests before shipment. Relevant test reports can be provided according to customer and project requirements.
The standard warranty period is 12 months from the shipping date, subject to the agreed sales and technical conditions.
If you are sourcing Medium Voltage Vcb Panel for a power plant, substation, industrial facility, mining project, commercial building, or specialized infrastructure project, Usune can provide configuration support based on your electrical requirements.
Send your single-line diagram, rated voltage, rated current, short-circuit level, cabinet quantity, and required functions to Usune for technical evaluation and quotation.
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