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ABB 1SDA038343R1 Molded Case Circuit Breaker 

1. Key Parameters

• Order Code/Part Number: 1SDA038343R1 (unique identifier for procurement and documentation)
• Product Series: ABB Tmax XT series (premium molded case circuit breakers for LV applications)
• Pole Configuration: 3 poles (optimized for three-phase AC power systems, 50/60Hz)
• Rated Current (Iₙ): 800A (continuous operating current rating, at 40℃ ambient temperature)
• Rated Voltage (Uₙ):
  • AC: 415V (line-line); 240V (line-neutral)
  • DC: Not applicable (AC-only design)
• Breaking Capacity (Iₙₜ): 65kA (at 415V AC, 50/60Hz)—ability to safely interrupt high short-circuit currents without damage
• Tripping Unit Type:
  • Standard: TMD (Thermal-Magnetic Device) – provides inverse-time overload protection (via bimetallic strip) and instantaneous short-circuit protection (via electromagnet).
  • Optional: Micrologic electronic trip unit (e.g., Micrologic 5.0E) – enables precise parameter adjustment (overload current, short-circuit pickup, time delays) and remote monitoring.
• Protection Functions:
  • Overload protection (50/51): Trips on sustained excess current to prevent wire/equipment overheating.
  • Short-circuit protection (50): Instantaneous trip on high fault currents (≥10×Iₙ for TMD units).
  • Optional earth fault protection (50N/51N): Residual current detection (IΔn: 0.5A~30A) for ground fault mitigation.
• Insulation Voltage (Ui): 690V AC (maximum voltage for safe insulation between live parts)
• Impulse Withstand Voltage (Uimp): 8kV (resistance to transient voltage spikes)
• Dimensions (W×H×D): 250mm × 300mm × 180mm (optimized for high-density switchboard integration)
• Weight: Approximately 7.8kg
• Mounting Method: Fixed mounting (compatible with ABB standard LV switchgear enclosures); withdrawable mounting (optional with adapter)
• Protection Class: IP40 (when installed in a compatible enclosure); Complies with IEC 60947-2, EN 60947-2, UL 489

2. Product Features

• High Breaking Capacity (65kA): Safely interrupts extreme short-circuit currents in industrial power systems (e.g., manufacturing plants, substations), protecting downstream equipment (motors, transformers, inverters) from catastrophic damage.
• Dual Tripping Unit Options:
  • TMD units: Cost-effective, low-maintenance solution for general-purpose applications (e.g., commercial buildings, non-critical industrial circuits).
  • Micrologic electronic units: Ideal for critical applications (data centers, hospitals) requiring customizable protection, energy metering, and remote diagnostics via Modbus.
• Robust Molded Case Design: Reinforced thermoset plastic housing (UL94 V-0 flame rating) provides excellent mechanical strength, corrosion resistance, and electrical insulation—withstanding dust, vibration, and temperature fluctuations in harsh environments.
• Flexible Accessory Integration: Compatible with ABB Tmax XT series accessories, including:
  • Auxiliary contacts (for status signaling),
  • Shunt trips (for remote tripping),
  • Undervoltage releases (for low-voltage protection),
  • Mechanical interlocks (for reversing circuits or bus-tie applications).
• Precise Current Sensing: Advanced current transformers (CTs) in the trip unit ensure accurate detection of overloads and short-circuits, minimizing false tripping from transient currents (e.g., motor startup inrush).
• Global Safety Compliance: Meets international LV safety standards, enabling seamless integration into projects worldwide—eliminating the need for regional product variants.

3. Application Fields

• Industrial Power Distribution: Protects main feeders and high-power branch circuits in manufacturing plants (automotive, steel, cement), mining operations, and petrochemical facilities—safeguarding heavy machinery (crushers, compressors, large motors).
• Commercial & Institutional Buildings: Installed in LV switchboards for shopping malls, airports, and hospitals—protecting HVAC systems, elevators, and critical loads (e.g., medical equipment, emergency lighting) from electrical faults.
• Data Centers & IT Facilities: Safeguards power distribution paths for server racks, UPS systems, and cooling infrastructure—ensuring uninterrupted power supply and preventing data loss from electrical failures.
• Infrastructure Projects: Used in utility substations, water treatment plants, and urban transit systems (metro, railways)—protecting public infrastructure electrical networks and ensuring reliable service.
• Renewable Energy Facilities: Integrates into solar farms and wind power plants to protect inverter systems, battery storage, and grid-connection circuits—supporting safe, compliant operation of renewable energy assets.

4. Precautions

• Current Rating Matching: Ensure the 800A rated current aligns with the circuit’s maximum continuous load—overloading (e.g., connecting excess equipment) will cause frequent tripping, contact wear, or overheating.
• Trip Unit Calibration: For TMD units, confirm default overload/short-circuit settings match the application (e.g., adjust if protecting motors with high startup inrush). For Micrologic units, use ABB’s PowerSuite software to calibrate parameters—avoid over-adjusting (e.g., increasing short-circuit pickup beyond safe limits) to prevent protection gaps.
• Installation Safety:
  • Disconnect the main power supply and discharge capacitors before installation/servicing—risk of electric shock persists if capacitors retain charge.
  • Use a torque wrench to tighten terminal connections (per ABB specifications: 45 N·m for 800A terminals) to avoid loose connections and overheating.
• Accessory Compatibility: Use only ABB-approved accessories designed for the Tmax XT series—non-compatible parts (e.g., third-party shunt trips) may disrupt tripping logic or cause mechanical failure.
• Environmental Protection:
  • Operate within the -5℃~+60℃ temperature range; derate current by 10% for every 10℃ above 40℃.
  • Install in a dust-tight, moisture-proof enclosure (IP40 or higher) in industrial or coastal environments to prevent corrosion of internal components.
• Regular Maintenance:
  • Annually inspect contacts for pitting/burning (replace if contact wear exceeds 2mm).
  • Test the tripping mechanism (via ABB’s test kit) to verify overload/short-circuit response.
  • Clean the molded case and terminals to remove dust buildup—avoid using water or corrosive cleaners
•  

The structure and details of the product：

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