For EPC contractors, electrical distributors, substations, industrial plants, and infrastructure projects, the Kyn28 Medium Voltage Switchgear provides a configurable platform for building complete indoor medium-voltage distribution systems.
Usune operates with ISO 9001, ISO 14001, and ISO 45001 management systems. Products are manufactured according to applicable IEC and GB standards, with CE certification available for relevant markets.
Selecting medium-voltage switchgear starts with the electrical system rather than the cabinet itself. Before placing an order, engineers normally need to confirm the system voltage, operating frequency, maximum load current, short-circuit level, number of feeders, protection requirements, cable arrangement, and installation environment.
These parameters determine the appropriate cabinet configuration and electrical components. Usune can review the project electrical information and recommend a suitable configuration instead of applying the same specification to every project.
This project-based selection method is particularly important for substations, manufacturing plants, power infrastructure, and other facilities where several medium-voltage circuits operate together.
The standard Kyn28 Medium Voltage Switchgear configuration supports medium-voltage systems from 3.6kV to 12kV, with current ratings ranging from 630A to 3150A.
Short-circuit performance is available in several levels, including 25kA, 31.5kA, 40kA, and 50kA configurations. The appropriate rating should be selected according to the calculated fault current of the electrical network rather than simply according to the normal operating load.
For project procurement, matching the rated current and short-circuit capacity with the upstream and downstream electrical equipment is essential for maintaining coordinated system performance.
A complete medium-voltage distribution system normally contains more than one type of cabinet. Incoming power, outgoing feeders, transformers, metering circuits, voltage measurement, and busbar connections may all require different functions.
Usune can configure the switchgear lineup according to these circuit requirements. The resulting arrangement can include incoming, outgoing, PT, metering, bus sectionalizer, and isolation functions within one coordinated electrical distribution system.
This makes the equipment suitable for projects where the switchgear needs to correspond directly with the approved single-line diagram.
Medium-voltage protection should be considered at system level. The switchgear, circuit breaker, protection relay, transformer, cable, and upstream protection equipment need to work together according to the project's protection philosophy.
The Kyn28 Medium Voltage Switchgear can be integrated with the required protection and control components according to the project specification. The vacuum circuit breaker provides the primary switching function, while the associated protection and control system can be configured according to the electrical design.
For EPC projects, Usune can coordinate the cabinet configuration with the customer's protection requirements and technical documentation.
The equipment uses a metal-enclosed cabinet structure with dedicated areas for primary electrical components, busbars, cable connections, and secondary control equipment.
The internal arrangement provides a defined layout for electrical installation and allows the complete switchgear lineup to be coordinated with cable routing, control wiring, operating access, and electrical room dimensions.
For projects with multiple cabinets, the arrangement can be planned according to the number of circuits and required functions rather than treating each cabinet as an independent product.
Electrical room conditions should be confirmed before the equipment is ordered. Important factors include available installation space, cable entry direction, operating clearance, ambient temperature, humidity, altitude, ventilation, and transportation access.
The standard equipment is intended for indoor installation. Ambient temperature is specified from -15°C to +40°C, while the daily average relative humidity should not exceed 95% and the monthly average should not exceed 90%.
For installations at higher altitudes or under special environmental conditions, Usune should be consulted during the engineering stage so that the appropriate electrical and insulation parameters can be considered.
Incoming cabinets connect the medium-voltage supply to the switchgear busbar system. The rated current, protection arrangement, measurement requirements, and incoming cable configuration should be confirmed according to the upstream electrical network.
Outgoing cabinets distribute power to transformers, motors, production equipment, or other downstream loads. Their quantity and current rating can be determined according to the project's load list and feeder schedule.
PT and metering cabinets can be incorporated where the project requires voltage measurement, energy measurement, or other electrical monitoring functions.
Bus sectionalizer configurations can be used where the distribution network requires separate bus sections or controlled connection between different sections of the system.
In substations, the equipment can be arranged around incoming sources, transformer feeders, outgoing circuits, metering, and busbar sectioning requirements. The configuration can be matched with the substation's electrical single-line diagram.
For factories, the switchgear can distribute medium-voltage power to production lines, transformers, motors, compressors, pumps, and auxiliary systems. Different feeder ratings can be specified according to the actual load distribution.
Mining projects often involve distributed heavy electrical loads. The switchgear can be configured around transformer feeders, motors, ventilation systems, pumping equipment, and processing facilities.
Large commercial and high-rise buildings may require medium-voltage incoming power and multiple downstream transformer circuits. The equipment can be arranged according to the building's electrical room and distribution requirements.
| Item | Specification |
| Model | KYN28A-12 |
| Rated Voltage | 3.6kV, 7.2kV, 12kV |
| Rated Frequency | 50Hz / 60Hz |
| Rated Current | 630A–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, with derating for higher altitude |
| Installation | Indoor |
| System | Three-phase AC |
The final specification should be confirmed according to the project voltage, load current, fault level, protection scheme, cable arrangement, and installation environment.
Usune has more than 14 years of experience in electrical equipment manufacturing and provides technical support for project-based medium-voltage equipment procurement.
Customers can provide the single-line diagram, voltage level, current rating, short-circuit requirement, cabinet quantity, functional requirements, and installation conditions. Usune can then assist with technical confirmation and equipment configuration.
For standard configurations, the typical production period is approximately 15–20 days after technical confirmation and payment. Actual delivery time depends on the project configuration and order quantity.
The KYN28 series has been referenced for the Cas-space Rocket Launch Project.
Unlike conventional commercial buildings or factories, aerospace infrastructure may contain several specialized electrical loads and supporting systems operating across different areas. The medium-voltage distribution equipment therefore needs to be coordinated with the overall facility power architecture.
For this project, the switchgear configuration was considered as part of the site's broader electrical distribution system, including power reception, circuit distribution, protection, and electrical control requirements.
The project demonstrates Usune's ability to participate in specialized engineering applications where medium-voltage equipment needs to be coordinated with project-specific electrical requirements rather than supplied as a generic standard cabinet.
Usune applies an integrated quality and production management system covering manufacturing, inspection, environmental management, and occupational safety.
The company holds ISO 9001, ISO 14001, and ISO 45001 certifications. The equipment is designed according to applicable IEC and GB standards, with CE certification available for applicable configurations.
Before shipment, the equipment undergoes routine inspection and testing covering relevant components, assembly, electrical connections, and finished equipment. Technical documentation and test reports can be supplied according to project requirements.
The main information includes system voltage, frequency, rated current, short-circuit level, number of incoming and outgoing circuits, protection requirements, cable arrangement, and installation conditions.
The provided configuration supports 3.6kV, 7.2kV, and 12kV systems. The final voltage rating should be confirmed according to the customer's electrical network.
Yes. Usune can review the customer's electrical diagram and configure the cabinet functions and ratings according to the project requirements.
Yes. It can be configured for incoming power, transformer feeders, outgoing circuits, metering, voltage measurement, and busbar sectioning in indoor substation applications.
Usune's products are designed according to applicable IEC and GB standards. The company operates under ISO 9001, ISO 14001, and ISO 45001 management systems, with CE certification available for applicable markets.
Yes. Usune can provide technical specifications, test reports, product documentation, and other project-related documents according to customer requirements.
For standard configurations, production is normally around 15–20 days after technical confirmation and payment. The actual schedule depends on configuration and quantity.
If you are purchasing Kyn28 Medium Voltage Switchgear, provide your single-line diagram, system voltage, rated current, short-circuit level, cabinet quantity, feeder requirements, protection requirements, and installation conditions.
Usune can evaluate the electrical requirements and provide a suitable medium-voltage switchgear configuration for your project.
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