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1. 1. ABB 1SDA073846R1 Air Circuit Breaker
    
    Product Description
    
    Low-voltage air circuit breaker (ACB) for extra-large-capacity low-voltage distribution systems, specialized in main power inlet protection, ultra-heavy-load switching, and fault isolation—key for heavy-duty industrial plants, mega data centers, and super-large infrastructure projects to ensure safe, stable, and continuous power distribution.
    
    Key Specs
    
    Rated Current (In): 1600A (frame size); rated breaking capacity (Icu): 120kA (415V AC, 50Hz).
    
    Voltage Rating: 415V AC (max operating voltage); 250V DC (auxiliary circuit).
    
    Protection Functions: Overcurrent (long-time/short-time/instantaneous, 5-100% In adjustable), earth fault protection (3-5000mA, selective tripping with 0-5s time delay).
    
    Mechanical Life: ≥10,000 operations; electrical life (rated current): ≥2000 operations.
    
    Env: -5°C~+40°C, 5%-95% RH (non-condensing), IP30 (enclosed switchboard installation).
    
    Control & Operation: Manual/electric operating mechanism (remote control via Modbus TCP optional); compatible with ABB Ekip Hi-T4 trip units for advanced intelligent management.
    
    Core Advantages
    
    Super-high breaking capacity: 120kA at 415V AC handles extreme short-circuit faults in 1600A extra-large-capacity systems (e.g., heavy industrial main power grids).
    
    Ultra-precise protection: Wider-range overcurrent/earth fault settings adapt to complex ultra-heavy loads (multiple 400kW motors + high-power industrial equipment + backup generators).
    
    Extra-large current carrying: 1600A rated current supports ultra-high-power scenarios (e.g., integrated steel mill production lines, mega data center core power distribution).
    
    Premium intelligence: Ekip Hi-T4 trip unit enables real-time 3-phase current waveform recording, fault root-cause analysis, and remote monitoring/control via industrial Ethernet.
    
    Applications
    
    Main incoming circuit protection for heavy-duty industrial plants (e.g., large-scale steel mills, petrochemical refineries) with 1600A power demand.
    
    Core distribution protection in mega data centers (supporting tens of thousands of server clusters + multi-level UPS backup systems).
    
    Main switchboard protection for super-large infrastructure (e.g., international airports, large-scale railway hubs) with multi-ultra-heavy-load circuits.
    
    Precautions
    
    Wiring: Main circuit use 300mm² copper cables; torque main terminals to 110-115N·m, auxiliary terminals to 8-10N·m—strictly avoid loose contacts to prevent overheating or arcing.
    
    Protection setting: Set long-time overcurrent to 1600A (full load); adjust short-time delay to 2-5s (accommodate ultra-large motor starting current); set instantaneous current to 20×In for inductive-dominant loads.
    
    Installation: Mount vertically in heavy-duty switchboards; reserve 35cm clearance above/below for heat dissipation and manual operation (prevent mechanical jamming during emergency tripping).
    
    Maintenance: Test trip function monthly (manual + electric modes); inspect contact surface semi-annually—replace if wear exceeds 25% of original thickness; clean arc-extinguishing chamber annually and replace after 8 years of service.
    
    Compatibility: Use only ABB-certified Ekip Hi-T4 trip units and dedicated accessories; non-approved parts may cause protection failure, mechanical damage, or safety hazards.

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