1.Product Overview
        High-voltage fire-resistant switchgear is a metal-enclosed assembly engineered for high-fire-risk environments, featuring a vacuum circuit breaker + solid-insulated busbar core. The enclosure is constructed from welded aluminum-zinc steel plates, with internal compartments sealed using metal barriers + fire-resistant fillers. Compliant with IEC 62271-200 for “Arc Fault Level Rating” (AFLR), it maintains structural integrity during internal arcing faults through directional pressure venting. Halogen-free flame-retardant materials suppress toxic gas emissions, ensuring safe evacuation.

2.Primary Functions
        Power Distribution: Enables multi-circuit power control and allocation.
        Short-Circuit/Overload Protection: Rapid fault current interruption via circuit breakers.
        Fire Containment: Fire-resistant barriers (ceramifiable silicone/mica plates) and arc-quenching gases.
        Condition Monitoring: Integrated interfaces for temperature, arcing, and partial discharge monitoring (IEC 61850 communication).
        Five-Safety Interlocking: Mechanical interlocks to prevent misoperation (IEC 62271-200).
        Fault Isolation: Directional pressure relief channels for arc-fault events (IEC 62271-200 Annex AA).

3.Product Parameters (Detailed)
        Electrical Parameters:Rated Voltage: 12kV; 1min Power Frequency Withstand: 42kV (IEC 62271-1),Rated Short-Time Withstand Current: 31.5kA/4s (IEC 62271-100)
        Mechanical Endurance:Circuit Breaker: 10,000 operations; Disconnector: 3,000 operations (IEC 62271-100)
        Environmental Compliance:Operating Temperature: -25°C to +40°C; Humidity ≤95% (IEC 60068-2)
        Fire Performance:Fire Resistance Duration: ≥60min (950°C flame) (IEC 60695-2-11)/Flame Retardancy Class: V-0 (Internal materials) (UL 94)
        Smart Features：Supports temperature sensors, arc-flash protection, and partial discharge monitoring (IEC 61850 Ed.2.0)

4.Product Features
Multi-Layer Fire Protection:
        Compartments use ceramifiable fireproof putty + double-layer steel plates, maintaining integrity at 950°C for ≥60min.
        Busbar chambers filled with N₂/SF₆ hybrid gas to suppress arc reignition.

Enhanced Safety Design:
        Certified for Internal Arc Fault (IAC AFLR 31.5kA/1s) with roof-directed pressure vents.
        Mechanical interlock between earthing switch and circuit breaker prevents live grounding.

Eco-Efficiency:
        Vacuum interrupters generate zero greenhouse gases; RoHS-compliant materials.

Smart Maintenance:
        Integrated wireless temperature sensors (±1°C accuracy) enabling Condition-Based Monitoring (CBM).

Compact Modularity:
        Expandable busbar system; ≤1.5mm/m alignment tolerance for cubicle extensions.
        International Standards Compliance:
        Insulation Design: IEC 62271-1
        Arc Fault Protection: IEC 62271-200 Annex AA
        Fire Testing: IEC 60695-2-11
        Communication Protocol: IEC 61850-7-420

medium and high voltage fire-resistant switchgear Models and Dimensions
        Typical Models: KYN28A-12(Z), UniGear ZS1 (Schneider), 8DJH (Siemens)
        Standard Dimensions (W × D × H):
        Circuit Breaker Compartment: 800mm × 1500mm × 2300mm
        VT/Metering Compartment: 600mm × 1500mm × 2300mm
        Busbar Connection Compartment: 600mm × 1500mm × 2300mm