1. What Is KYN28-12 Metal Clad Withdrawable Medium Voltage Switchgear?
KYN28-12, formally named Metal Clad Withdrawable Indoor Medium Voltage Switchgear, is the most widely adopted air-insulated 12kV indoor power distribution panel for three-phase AC 50Hz power grids, used to receive, distribute, control and protect medium voltage electrical circuits
The whole cabinet adopts fully metal-clad partition structure, divided into four independent sealed compartments: busbar chamber, vacuum circuit breaker handcart chamber, cable chamber and relay instrument chamber, separated by thick steel plates to avoid fault spread between functional areas. All live components are isolated inside metal barriers, reaching IP4X enclosure protection grade, perfectly matching indoor power rooms of industrial plants, commercial complexes, photovoltaic power stations and municipal substations.
Its core feature is the middle-mounted withdrawable vacuum circuit breaker handcart. Operators can pull the whole VCB trolley out of the cabinet for inspection, maintenance or replacement without cutting off the whole busbar power supply, greatly reducing power outage duration for downstream loads. It complies strictly with IEC 62271-1, IEC 62271-200 and GB3906 international standards, supporting single busbar and sectionalized double busbar system layout
Our factory’s KYN28-12 cabinet frame is manufactured with CNC folded aluminum-zinc steel sheet, connected by high-strength bolts, with strong corrosion resistance and mechanical stability, widely exported to Europe, Southeast Asia, Middle East and Australia engineering projects.
2. Core Structural & Safety Advantages of KYN28-12 Switchgear
2.1 Complete Five-Prevent Mechanical Interlock Safety System
The most competitive highlight of KYN28-12 is integrated five-prevent interlock function, eliminating all human misoperation risks:
- Prevent mistakenly closing or opening vacuum circuit breaker without operation instruction;
- Prevent pushing/pulling loaded VCB handcart to avoid arc short-circuit;
- Prevent closing earthing switch when main bus is live;
- Prevent power transmission while earthing switch is closed;
- Prevent operators opening compartment door to enter live high-voltage zoneZhejiang T….
All interlock structures are mechanical linkage without electronic control failure risk, mandatory for public buildings, data centers and large industrial power distribution projects with strict safety management requirements.
2.2 Convenient Withdrawable Handcart Design, Low Downtime Maintenance
The vacuum circuit breaker trolley is installed in the middle chamber, with three fixed positions: working position, test position and isolated position. When maintenance is needed, operators only pull the trolley out along guide rails, the primary and secondary circuit connectors automatically separate, no need to cut off the whole station power supply. Spare handcart can realize zero-power-outage replacement, critical for continuous production factories and new energy power stations with high power supply reliability demands.
Compatible with mainstream VCB models: ZN63A(VS1), VD4, VB2 and imported 3AH vacuum breakers, flexible to match different customer brand requirements.
2.3 Independent Partition Metal-Clad Anti-Arc Structure
Four fully isolated metal compartments block internal arc faults effectively. Once short-circuit arc occurs inside one chamber, high-temperature gas and flame will not spread to adjacent zones or leak outside the cabinet, protecting field staff and surrounding equipment. Cable chamber reserves large wiring space, supporting multi-core large-section cable installation and easy post-inspectionDaqo Group.
2.4 Flexible Layout & Space-Saving Installation
KYN28-12 supports wall-mounted front-only maintenance layout to save substation floor area, or back-to-back double-side operation arrangement for large-scale distribution stations. Standard cabinet dimensions are 800/1000mm width × 1500mm depth × 2300mm height, customizable size available for narrow power room conditions. Modular busbar connection allows free combination of incoming cabinet, outgoing cabinet, PT metering cabinet and capacitor compensation cabinet.
2.5 Intelligent Upgradable & Grid Automation Support
We reserve complete secondary wiring space for intelligent monitoring modules: temperature sensor, partial discharge detector, motorized handcart driving mechanism, DTU remote communication unit and HMI touch screen. It can realize remote switching control, real-time equipment status monitoring and fault automatic alarm, adapting to smart city distribution network and unattended substation construction trends.
3. Main Application Scenarios of KYN28-12 MV Switchgear
3.1 Industrial Manufacturing Parks & Heavy Factories
Textile plants, chemical factories, mining enterprises, food processing workshops all adopt KYN28-12 as medium voltage incoming and outgoing cabinet. Stable short-circuit withstand capacity (20kA~50kA) bears instantaneous impact current of large motors, five-prevent interlock reduces safety accidents in factory power rooms.
3.2 Photovoltaic & Wind New Energy Stations
Centralized ground PV power plants and wind farm collector stations widely configure KYN28-12 panels for medium voltage power collection. Withdrawable handcart design facilitates equipment overhaul during power generation peaks, intelligent communication modules connect to SCADA system for unified power generation data management. Matched with dry type transformers and SF6 ring main units to form complete box-type substation solutions.
3.3 Commercial & Public Infrastructure
Shopping malls, hospitals, metro stations, airports, schools and data centers install KYN28-12 in basement power distribution rooms. Arc-resistant metal-clad structure meets strict indoor fire protection standards, low maintenance frequency reduces repeated construction excavation and inspection work in crowded downtown areas.
3.4 Municipal Power Grid & Urban Substations
City district secondary substations, residential community power supply stations use KYN28-12 for 10kV ring network power distribution. Modular combination adapts to expanding urban load, standardized structure simplifies EPC project one-line scheme design and tender bidding.
3.5 Water Conservancy & Transportation Projects
Highway service areas, pumping stations, tunnel power distribution rooms and remote signal base stations choose KYN28-12 for stable indoor power control, reliable mechanical interlock adapts to unattended operation environment.
4. Standard Technical Parameters of Our KYN28-12 Switchgear
As a power equipment manufacturer with 15 years of industry experience, all panels pass full type test and CE certification, fully compliant with IEC international standards for global export:
- Rated voltage: 3.6kV / 7.2kV / 12kV
- Rated frequency: 50Hz / 60Hz customizable
- Rated cabinet current: 630A ~ 5000A
- Rated short-time withstand current: 16kA, 20kA, 25kA, 31.5kA, 40kA, 50kA (4s duration)
- Enclosure protection grade: IP4X
- Cabinet material: 2mm anti-corrosion aluminum-zinc plated steel
- Mechanical operation life of VCB handcart: ≥10,000 times
- Operating environment: indoor, -10℃ ~ +40℃, altitude ≤3000m (high-altitude version customized)
- Optional functions: motorized trolley, temperature online monitoring, arc flash protection, remote DTU communication
We support full OEM & ODM customization: cabinet color, printed brand logo, primary circuit scheme, secondary wiring logic and communication protocol adjustment to meet different national grid tender requirements. Every KYN28-12 panel completes insulation, temperature rise and short-circuit withstand test before delivery, providing complete test reports and certification documents for third-party inspection and customs clearance.
5. KYN28-12 VS SF6 Gas Insulated RMU Selection Guide
Many overseas purchasers confuse air-insulated KYN28-12 and gas insulated ring main units during project bidding; clear comparison helps quick selection:
- Installation environment: KYN28-12 only for indoor power rooms; SF6 RMU supports underground kiosks, narrow tunnel and outdoor compact substation.
- Equipment capacity: KYN28-12 supports high current up to 5000A for main incoming cabinet; SF6 RMU mostly limited under 1250A for branch ring network.
- Maintenance cost: KYN28-12 needs regular vacuum breaker inspection; fully sealed SF6 RMU is maintenance-free within 30 years.
- Project budget: KYN28-12 single panel cost lower, suitable for spacious indoor power rooms with sufficient maintenance space; SF6 RMU unit price higher but saves civil construction space cost.
- Fault processing: KYN28 withdrawable handcart can be replaced quickly; SF6 RMU gas tank maintenance needs professional inflation and airtight test equipment.
Selection suggestion: Choose KYN28-12 metal clad withdrawable switchgear if you need high-current main incoming/outgoing control with independent indoor power room; select SF6 gas insulated RMU for compact underground or outdoor small ring distribution projects.
6. Why Source KYN28-12 Switchgear From Our 15-Year Factory?
- Strict raw material control: High-permeability cold-rolled silicon steel busbar and qualified vacuum circuit breakers reduce power loss and extend service life;
- Independent mold production line: Standard and non-standard cabinet schemes with stable delivery cycle (7–15 working days for standard models);
- One-stop matching solution: We supply supporting dry/oil immersed transformers, low voltage MNS/GGD cabinets and SF6 RMUs together to integrate complete medium-low voltage distribution packages;
- Professional OEM service: Accept private label customization, project scheme optimization and multi-language technical drawing support for electrical distributors and EPC contractors;
- Global after-sales system: Provide remote installation training, operation video guide and long-term spare parts supply of VCB, interlock components and monitoring modules.
