KYN28A-12
| Applicable standard |
IEC 62271-200 (equivalent to GB/T 3906-2020) IEC 62271-1 (equivalent to DL/T 404-2018) IEC 62271-102 (equivalent to GB/T 1985-2023) |
| Rated voltage (Ur) | 12 kV |
| Short-circuit capability |
Icw: 31.5 kA / 4 s; 40 kA / 4 s Ipk: 80 kA / 100 kA Isc (T100): 31.5 kA / 80 kA (peak); 40 kA / 100 kA (peak) |
| Rated current (In) | 2500 A / 3150 A |
| Degree of protection |
Enclosure: IP4X Compartments / breaker room door open: IP2X |
| Rated frequency | 50/60 Hz |
| Power-frequency withstand voltage (PF) |
2500 A: 42 (phase-to-earth and phase-to-phase) / 48 (across the open contacts) 3150 A: 95 (phase-to-earth and phase-to-phase) / 118 (across the open contacts) |
| Lightning impulse withstand voltage (LI / BIL) |
2500 A: 75 (phase-to-earth and phase-to-phase) / 85 (across the open contacts) 3150 A: 185 (phase-to-earth and phase-to-phase) / 215 (across the open contacts) |
| Making & breaking duty (T100s / T100a) |
2500 A: 80 (making current) / 31.5 (breaking current) 3150 A: 100 (making current) / 40 (breaking current) |
| Operating sequence | O – 0.3 s – CO – 180 s – CO |
| Temperature rise |
1.1 × In (2500 A) 1.1 × In (3150 A) |
| Circuit resistance |
2500 A: Main circuit ≤ 80 μΩ; breaker ≤ 48 μΩ 3150 A: Main circuit ≤ 75 μΩ; breaker ≤ 45 μΩ |
| Mechanical endurance |
2500 A: Withdrawable part (truck): 1,000 operations 3150 A: Withdrawable part (truck): 2,000 operations |
| Mechanical operation & characteristics |
Interlocking: reliable Mechanical characteristics: comply with the technical requirements |
| Earthing circuit withstand |
2500 A: Icw(earth) 27.4 kA / 2 s; Ipk(earth) 69.6 kA 3150 A: Icw(earth) 34.8 kA / 2 s; Ipk(earth) 87.0 kA |
Product Overview:
KYN28-12 is an indoor metal-clad withdrawable AC switchgear system designed for medium-voltage power distribution networks up to 12 kV. Based on IEC 62271 metal-enclosed switchgear architecture, the system is engineered to meet the requirements of utility, industrial, commercial, and infrastructure applications that demand high operational reliability, system safety, and flexible configuration.
The switchgear adopts a standardized, compartmentalized, and modular design, integrating withdrawable vacuum circuit breakers, current and voltage transformers, protection and control devices, and complete mechanical interlocking systems within a robust metal-clad enclosure. This architecture ensures a high level of operational safety, clear functional separation between compartments, and convenient maintenance through withdrawable breaker design, enabling safe isolation, inspection, and replacement without disturbing adjacent equipment.
KYN28-12 is compatible with modern protection relays, metering devices, and communication interfaces, enabling integration into intelligent power distribution systems and supporting condition monitoring, remote operation, and efficient operation and maintenance strategies. The switchgear is widely applicable in power substations, industrial plants, commercial facilities, and infrastructure projects, providing a safe, reliable, and scalable solution for medium-voltage power distribution and control.
Standards Compliance
Manufactured and assembled by RKP Dreams in accordance with applicable standards, including IEC 62271-200, IEC 62271-1, and IEC 62271-102, KYN28-12 combines proven medium-voltage switchgear design principles with RKP Dreams’s engineering integration capability, customization flexibility, and strict quality control. The system supports multiple rated current configurations and verified short-circuit performance, allowing it to be tailored to different network capacities and project requirements.
Product Features:
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Metal-clad and compartmentalized designFully metal-enclosed structure with functional separation of busbar, circuit breaker, cable, and low-voltage compartments, providing enhanced operational safety and compliance with IEC 62271-200 requirements.
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Withdrawable vacuum circuit breakerEquipped with a withdrawable vacuum circuit breaker mounted on a truck mechanism, allowing safe insertion, withdrawal, and isolation for maintenance without affecting adjacent feeders.
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Verified short-circuit and switching performanceDesigned and type-tested for rated short-circuit making, breaking, and withstand currents, ensuring reliable operation under fault conditions and compliance with utility and industrial network requirements.
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Flexible rated current configurationsSupports multiple rated current options (e.g., 2500 A and 3150 A), enabling adaptation to different load capacities and system designs within the same switchgear platform.
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Comprehensive mechanical interlocking systemReliable interlocking prevents incorrect operation, such as breaker insertion or withdrawal under load, earthing switch operation when the breaker is closed, and access to live compartments.
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High insulation coordinationInsulation levels are coordinated according to IEC standards, ensuring adequate dielectric strength under power-frequency and lightning impulse conditions.
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Compatibility with intelligent protection and controlSupports integration of numerical protection relays, metering devices, and communication interfaces, enabling remote monitoring, protection coordination, and system automation.
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Robust mechanical constructionRigid enclosure structure and high-quality components ensure mechanical strength, long service life, and resistance to operational stresses.
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Convenient installation and maintenanceModular panel design and front-access maintenance facilitate installation, inspection, and replacement, reducing downtime and improving operational efficiency.
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Customizable configurationFeeder arrangements, protection schemes, auxiliary circuits, and interfaces can be configured to meet specific project and application requirements.
Operating Conditions
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Ambient temperature
- Maximum: +40 °C
- Minimum: –15 °C (or lower upon request)
- 24-hour average: ≤ +35 °C
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Relative humidity
- Daily average: ≤ 95%
- Monthly average: ≤ 90%
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Altitude
- ≤ 1000 m above sea level
- (Higher altitudes require derating or special design.)
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Atmospheric conditions
- Free from excessive dust, corrosive gases, flammable vapors, and heavy pollution. Suitable for normal indoor industrial environments.
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Seismic conditions
- Suitable for installations with seismic intensity up to the levels defined in applicable standards, subject to project requirements.
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Installation environment
- Indoor installation.
- The switchgear shall be installed on a level foundation with adequate ventilation, ensuring normal heat dissipation and safe operation.
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