1.Product Overview:
        The KYN61-40.5 is an IEC 62271-200-compliant, arc-resistant, withdrawable metal-enclosed switchgear. Featuring modular construction, its primary circuit components are mounted on a removable truck, enabling “Service/Test/Disconnect” positions. The enclosure comprises aluminum-zinc alloy coated steel plates, integrating vacuum circuit breakers and microprocessor-based protection relays. It supports intelligent monitoring and meets high safety and maintenance-free requirements in harsh environments.

2.Product Functions
       Primary Circuit Switching: Interrupts load and fault currents precisely via vacuum circuit breakers.
       System Protection: Incorporates overcurrent, instantaneous trip, earth fault, and transformer differential protection (IEC 60255 compliant).
       Condition Monitoring: Real-time acquisition of current, voltage, temperature, and mechanical parameters; supports remote communication (IEC 61850 protocol).
       Safety Interlocking: Mechanical and electrical five-safety interlocking system (prevents unauthorized CB operation, access to live compartments, truck removal under load, etc.).
       Fault Isolation: Integrated pressure relief channels for directional arc energy exhaust (IAC-AFLR certified).

3.Product Composition
       Enclosure Structure: Divided into circuit breaker compartment, busbar compartment, cable compartment, and relay compartment; constructed with 2mm aluminum-zinc coated steel plates and segregated by grounded metal partitions.

Core Components:
       Vacuum Circuit Breaker Truck: Spring-operated mechanism (e.g., VS1, VD4 types), breaking endurance ≥10,000 operations.
       Current Transformers (CT): Epoxy resin cast type, accuracy class 0.2S (IEC 60044-1).
       Voltage Transformers (VT): Electromagnetic or capacitive type for metering and protection.
       Earthing Switch: Fast-closing type, peak withstand current 100kA.
       Microprocessor-Based Protection Relay: Supports Modbus RTU/IEC 61850 communication.
       Surge Arrester: Gapless metal oxide type (MOA) for switching overvoltage limitation.

Product Parameters
        Insulation Level: 95kV power frequency withstand voltage (1min), 185kV lightning impulse withstand voltage (IEC 60071).
        Main Busbar Current: 3150A (copper, silver-plated).
        Mechanical Endurance: Circuit breaker ≥10,000 operations; earthing switch ≥2,000 operations.
        Environmental Suitability: Operating temperature -25°C to +55°C; relative humidity ≤95% (non-condensing); altitude ≤2000m (derating required above 2000m).
        Certifications: Type-tested per IEC 62271-200, GB 3906, and ANSI C37.20.2 standards.

Switchgear Model & Dimensions
        Model: KYN61-40.5 (“K” for arc-resistant, “Y” for withdrawable, “N” for indoor, “61” design series, “40.5” rated voltage in kV).
        Standard Unit Dimensions: Width 1200mm × Depth 1800mm × Height 2600mm (custom non-standard dimensions available).