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1. 1. ABB 1SDA073674R1 Low-Voltage Air Circuit Breaker
    
    Product Description
    
    Low-voltage air circuit breaker (ACB) for low-voltage power distribution systems, designed for main circuit protection, load switching, and fault isolation—core for industrial plants, commercial buildings, and data centers to ensure safe and reliable power supply.
    
    Key Specs
    
    Rated Current (In): 630A (frame size); rated breaking capacity (Icu): 50kA (415V AC, 50Hz).
    
    Voltage Rating: 415V AC (max operating voltage); 250V DC (auxiliary circuit).
    
    Protection Functions: Overcurrent (long-time/short-time/instantaneous), earth fault protection (30-3000mA adjustable).
    
    Mechanical Life: ≥10,000 operations; electrical life (rated current): ≥2000 operations.
    
    Env: -5°C~+40°C, 5%-95% RH (non-condensing), IP30 (enclosed installation).
    
    Control & Operation: Manual/electric operating mechanism; compatible with ABB Ekip trip units (e.g., Ekip LS) for intelligent protection.
    
    Core Advantages
    
    High breaking capacity: 50kA at 415V AC handles short-circuit faults in medium-capacity distribution systems.
    
    Comprehensive protection: Multi-stage overcurrent + earth fault protection prevents equipment damage and electrical hazards.
    
    Flexible operation: Manual/electric control adapts to on-site operation needs (e.g., remote electric switching for data centers).
    
    Intelligent compatibility: Supports Ekip trip units for real-time current monitoring and fault data recording.
    
    Applications
    
    Main incoming circuit protection for industrial plant low-voltage switchboards (630A rated current, 415V system).
    
    Power distribution protection in commercial buildings (e.g., shopping malls) to isolate floor-level power faults.
    
    Backup circuit protection for data center UPS systems (ensures safe switching during power backup/restore).
    
    Precautions
    
    Wiring: Main circuit use 120mm² copper cables; torque terminals to 45-50N·m (main contacts) and 8-10N·m (auxiliary contacts).
    
    Protection setting: Set overcurrent/earth fault thresholds per system design (e.g., instantaneous current = 10×In for motor loads).
    
    Installation: Mount vertically in switchboards; ensure 15cm clearance above/below for heat dissipation and operation.
    
    Maintenance: Test trip function quarterly (manual/electric operation); check contact wear annually (replace if contact thickness <50% of original).
    
    Compatibility: Use ABB-approved trip units and accessories—non-approved parts may affect protection performance.

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