1.Product Overview
        Marine MV/HV switchgear serves as the core power distribution equipment in vessel electrical systems. Featuring modular construction, its main structure uses welded aluminum-zinc alloy coated steel. Internal compartments include circuit breaker, busbar, cable, and relay compartments. The enclosure employs anti-corrosion coating (C5-M grade) and sealed design to resist salt spray. Circuit breakers utilize vacuum interruption (VCB) or SF₆ gas insulation (GIS). Certified by DNV-GL, ABS, LR, CCS, and other classification societies. Suitable for LNG carriers, container ships, drilling rigs, and other demanding applications.

2.Primary Functions
        Power Distribution: Radial multi-circuit supply with busbar sectionalization/transfer.
        Circuit Control: Local/remote switching (motorized/manual operation).
        Overcurrent & Short-Circuit Protection: Instantaneous, definite-time/inverse-time protection via circuit breakers.
        Earth Fault Protection: Zero-sequence current monitoring (sensitivity ≥1A).
        Arc Fault Protection (Optional): Arc flash sensors + high-speed tripping (<10ms).
        Condition Monitoring: Intelligent releases for real-time voltage/current/power/temperature measurement.
        Mechanical Interlocks: Ensures safe operating sequences (e.g., earth switch/circuit breaker interlock).
        Selective Coordination: Time-current curve grading to minimize fault outage range.
        Insulation Monitoring: Real-time system-to-earth insulation resistance monitoring (>1MΩ alarm).
        Harmonic Suppression (Optional): Filter reactors to limit THDi to <5%.
        Synchronization: Generator switchgear with sync-check and auto-paralleling functions.
        Communication Interfaces: Modbus RTU/TCP, IEC 61850 GOOSE/MMS for integration with vessel EMS.
        Emergency Trip: Mechanical quick-break mechanism for critical scenarios.

3.Product Features
High Reliability Design:
        Double Insulation: Heat-shrink busbar sleeves + phase barriers meeting IEC 62271-200 creepage requirements.
        Anti-Condensation Heating: Automatic thermostatic control in relay compartments.

Ease of Maintenance:
        Withdrawable Circuit Breakers: Test/Disconnect/Service positions enabling live maintenance.
        Front-Access Cabling: Front-connected terminals for space-efficient installation.

Smart Diagnostics:
        Contact Wear Monitoring: Operation cycles + I²t integration for lifespan prediction.
        Wireless Temperature Sensing: Passive RFID sensors for hotspot detection.

Compact & Lightweight:
        Optimized MV Depth: ≤1500mm (vs. ≥1800mm for land-based equivalents), ideal for confined engine rooms.

Safety Certification:
        Internal Arc Classification (IEC 62271-200): IAC AFLR 25kA/1s (personnel protection).

Product Parameters (Comprehensive)
Electrical Parameters:
        Power Frequency Withstand Voltage (1min): 24kV (12kV systems), 32kV (15kV systems)
        Lightning Impulse Withstand Voltage (1.2/50μs): 60kV (12kV systems), 75kV (15kV systems)
        Temperature Rise Limit: Busbars ≤65K (at 40°C ambient), Terminals ≤70K
        Partial Discharge Level: ≤10pC (12kV VCB, IEC 60270)

Mechanical Parameters:
        Vibration Resistance: IEC 60068-2-6 (5-150Hz, 2g)
        Tilt Stability: Longitudinal ±15°, Transverse ±22.5° (per IMO MSC.158)
        Mechanical Endurance: Circuit breakers ≥10,000 ops; Disconnectors ≥3,000 ops

Environmental Parameters:
        Operating Temperature: -25°C to +55°C
        Humidity Tolerance: 95% RH (non-condensing at 40°C)

Model Examples:
        AMG-12 (Air-insulated, fixed type, 12kV)
        VS1-7.2 (Vacuum circuit breaker, withdrawable type, 7.2kV)
        Typical Dimensions (W×D×H in mm):
        LV Switchgear (0.4kV): 600×800×2200
        MV Switchgear (3.3-7.2kV): 800×1500×2200
        HV Switchgear (11-15kV): 1000×1800×2300
        Note: Width increases with higher current ratings; depth scales with insulation clearance requirements.