The KYN61-40.5 33kV Indoor VCB Switchgear Panel is developed for projects requiring a higher-voltage indoor distribution platform. Its configuration combines a withdrawable vacuum circuit breaker, metal-enclosed construction, separated electrical compartments, busbar systems, cable connections, and secondary control equipment into an integrated switchgear lineup.
Usune operates under ISO 9001, ISO 14001, and ISO 45001 management systems. The equipment is designed according to applicable IEC and GB standards, with CE certification available for applicable markets.
For 33kV and 36kV-class distribution systems, switchgear selection requires more than simply matching the nominal voltage. Engineers need to consider insulation level, load current, fault current, feeder configuration, transformer capacity, cable connection, protection coordination, and the installation environment.
The KYN61-40.5 33kV Indoor VCB Switchgear Panel is intended for indoor medium-voltage distribution where these electrical parameters need to be coordinated within a complete power distribution system.
Compared with lower-voltage switchgear applications, the higher system voltage places greater emphasis on insulation coordination and short-circuit performance. Usune can configure the equipment according to the electrical parameters provided by the customer.
The equipment uses a metal-enclosed architecture to organize the primary and secondary electrical sections. The main circuit includes the vacuum circuit breaker, busbar connections, cable termination area, and associated grounding components.
Secondary equipment can be arranged for protection, measurement, control, indication, and communication according to the project requirements.
This configuration allows the switchgear lineup to be designed around the actual electrical network rather than using one fixed cabinet arrangement for every application.
At higher voltage levels, protection coordination becomes an important part of system design. The circuit breaker, protection relay, transformer, cable, and upstream equipment should be selected according to the calculated fault conditions and protection philosophy.
The vacuum circuit breaker provides the primary switching and interruption function. The associated protection and control system can be configured according to the customer's electrical design.
Metal partitions between functional sections help organize the internal electrical layout, while the pressure relief arrangement provides a controlled path for pressure discharge in the event of an internal fault.
An incoming cabinet receives power from the upstream electrical network and transfers it to the switchgear busbar system. Rated current, protection equipment, measurement requirements, and cable configuration should be determined from the project design.
Outgoing cabinets distribute power to transformers, motors, production equipment, or other downstream loads. The current rating and protection settings should correspond to the connected load.
PT and voltage measurement configurations can be incorporated where the project requires voltage monitoring, protection functions, or electrical measurement.
Bus sectionalizing arrangements can divide the distribution system into separate sections and support the electrical operating strategy defined by the project engineer.
Metering configurations can be provided for applications requiring energy measurement and electrical parameter monitoring.
The cabinet is organized into defined electrical sections, including the breaker compartment, busbar compartment, cable compartment, and instrument/control compartment.
The breaker section accommodates the vacuum circuit breaker and its operating mechanism. The busbar section provides the main electrical connection between cabinets, while the cable compartment provides space for incoming and outgoing cable connections.
The instrument and control section contains secondary components required for protection, measurement, control, and indication.
This arrangement gives engineers a clear internal architecture when planning installation, cable routing, commissioning, and maintenance.
The equipment incorporates a mechanical interlocking system designed to restrict incorrect operating sequences.
The five-proof mechanism is intended to prevent incorrect circuit breaker operation, movement of the withdrawable unit under load, closing the earthing switch while energized, energizing the circuit while the earthing switch remains closed, and accidental access to energized compartments.
A top-mounted pressure relief device is also incorporated into the cabinet structure to provide controlled pressure release during an internal fault condition.
The KYN61-40.5 33kV Indoor VCB Switchgear Panel can be configured for incoming power, transformer connections, outgoing feeders, bus sectioning, metering, and voltage measurement in indoor substations.
Power plants can use the switchgear for medium-voltage auxiliary distribution, generator-related electrical systems, transformer feeders, and downstream power distribution.
Large industrial facilities can use different feeder configurations for motors, transformers, production systems, pumps, compressors, and auxiliary electrical equipment.
Mining operations with higher-power electrical loads can configure the switchgear around transformer feeders, motors, ventilation equipment, pumping systems, and processing facilities.
The equipment is also suitable for specialized infrastructure where electrical distribution needs to be coordinated with multiple buildings, equipment areas, and auxiliary systems.
The Cas-space Rocket Launch Project is a project reference for Usune medium-voltage switchgear applications.
A rocket launch facility involves specialized infrastructure and multiple electrical loads distributed across different functional areas. Its power distribution system therefore needs coordinated incoming circuits, feeder protection, electrical isolation, measurement, and control.
For this project, the switchgear was applied as part of the site's medium-voltage electrical distribution arrangement. The project required electrical equipment to be integrated with the broader infrastructure rather than treated as an independent cabinet installation.
This application demonstrates Usune's experience in supplying medium-voltage distribution equipment for specialized engineering projects with specific electrical system requirements.
| Item | Specification |
| Series | KYN61 |
| Rated Voltage | 3.6kV, 7.2kV, 12kV, 24kV, 36kV |
| 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 |
| Relative Humidity | Daily average ≤95%; monthly average ≤90% |
| Altitude | ≤1000m, with derating for higher altitude |
| Installation | Indoor |
| System | Three-phase AC |
The final electrical configuration should be confirmed according to the actual project voltage, current, fault level, insulation requirements, protection scheme, and installation conditions.
For a 33kV-class switchgear project, procurement should be based on the complete electrical system rather than cabinet quantity alone. The project team should confirm the rated system voltage, continuous load current, short-circuit level, feeder quantity, transformer capacity, cable arrangement, protection requirements, and required measurement functions.
For larger projects, the lineup may contain different cabinet functions. Incoming, outgoing, PT, metering, bus sectionalizer, and isolation configurations can be combined according to the electrical single-line diagram.
This approach helps prevent mismatches between the switchgear and connected transformers, cables, protection devices, and downstream loads.
The final cabinet arrangement can be developed according to the electrical architecture of the project. Different numbers of incoming and outgoing circuits can be arranged into a coordinated switchgear lineup.
A typical distribution system may include an incoming cabinet connected to the upstream power source, several outgoing cabinets supplying transformers or major loads, and additional PT or metering cabinets for voltage measurement and energy monitoring.
Where the project requires two power sources or divided bus sections, bus sectionalizing functions can also be incorporated into the lineup.
This configuration method makes the equipment suitable for both individual substations and larger multi-cabinet distribution systems.
Before delivery, the completed switchgear undergoes inspection of the cabinet assembly, primary circuit connections, secondary wiring, mechanical operation, and relevant electrical functions.
The withdrawable mechanism, circuit breaker operation, interlocking functions, grounding arrangement, and cabinet construction are checked during the production inspection process.
Usune can provide relevant inspection records and test documentation according to project requirements, allowing customers, EPC contractors, and third-party inspectors to verify the equipment before shipment.
The value of a medium-voltage switchgear system is not limited to its initial electrical rating. For large infrastructure and industrial projects, the equipment also needs to support organized operation, planned maintenance, future circuit management, and stable integration with the wider power distribution network.
The compartmentalized construction of the KYN61-40.5 33kV Indoor VCB Switchgear Panel provides a defined arrangement for primary and secondary equipment, while the withdrawable circuit breaker design allows the switching unit to be moved for inspection and servicing.
For facilities where electrical distribution is expected to operate for many years, this combination can help create a more manageable medium-voltage distribution system and simplify future maintenance planning.
The provided specification includes 3.6kV, 7.2kV, 12kV, 24kV, and 36kV configurations. The actual rated voltage should be confirmed according to the customer's power system.
The supplied specification lists a 36kV rated configuration, which can be considered for 33kV-class systems subject to confirmation of the actual system requirements, insulation level, and applicable standards.
It is used for medium-voltage power receiving, distribution, switching, protection, measurement, and control in indoor three-phase AC power systems.
The provided configurations range from 630A to 3150A. The correct rating should be selected according to the maximum continuous load and project design.
Available ratings include 25kA, 31.5kA, 40kA, and 50kA, with the applicable value determined by the calculated fault level of the electrical system.
Yes. Usune can configure incoming, outgoing, PT, metering, bus sectionalizer, and isolation functions according to the customer's single-line diagram and technical requirements.
Usune operates under ISO 9001, ISO 14001, and ISO 45001 management systems. The products are designed according to applicable IEC and GB standards, with CE certification available for applicable configurations.
Yes. Usune can provide technical specifications, test reports, drawings, and other project documentation according to customer and engineering requirements.
The standard configuration is designed for indoor installation. Special conditions such as high altitude, high humidity, or unusual environmental conditions should be confirmed before ordering.
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