KYN28-12 Armored Removable AC Metal-Enclosed Switchgear: Technical Description The KYN28-12 is a high-performance, armored, removable AC metal-enclosed switchgear designed for indoor installation in medium-voltage power distribution systems. It complies with international standards such as IEC 62271-200 and GB/T 3906, ensuring reliability and safety in industrial, commercial, and utility applications. Design and Construction The switchgear features a modular, metal-enclosed structure with a robust welded steel frame, providing excellent mechanical strength and protection against internal arc faults (rated up to 31.5 kA/4s). The enclosure is divided into distinct compartments for circuit breakers, busbars, cables, and low-voltage control devices, ensuring segregation and safety. The front panel includes a viewing window for visual inspection of the breaker position. Key Components 1. Vacuum Circuit Breaker (VCB): The removable draw-out type VCB (rated 12 kV, 630–3150 A) ensures reliable interruption of fault currents. Its spring-operated mechanism allows quick, low-energy switching. 2. Busbar System: The main and branch busbars, insulated with heat-shrinkable sleeves, support currents up to 3150 A. The design minimizes resistance and thermal losses. 3. Cable Compartment: Equipped with insulated cable connectors and optional surge arresters, it supports both top and bottom cable entry. 4. Protection and Control: Integrated relays, meters, and PLC-compatible interfaces enable remote monitoring and automation. Safety Features - Interlocking System: Mechanical interlocks prevent incorrect operations (e.g., breaker insertion under load). - Earthing Switch: Ensures safe maintenance by grounding the circuit. - Arc-Resistant Design: Reinforced panels and pressure relief channels divert arc gases safely. Performance Parameters - Rated Voltage: 12 kV - Rated Current: Up to 3150 A - Short-Circuit Current: 25–31.5 kA - Insulation Level: 42 kV power frequency, 75 kV lightning impulse Applications Ideal for substations, factories, and renewable energy plants, the KYN28-12 ensures efficient power distribution with minimal maintenance. Its compact footprint and modularity facilitate easy expansion. Advantages - High reliability and long service life. - User-friendly operation with ergonomic design. - Compliance with global safety standards. This switchgear combines advanced technology with robust construction, making it a preferred choice for modern medium-voltage networks.