Schneider 33478 | Circuit breaker, ComPact NS1250N, 50kA/415VAC, Micrologic 2.0 trip unit, 1250A, fixed, 3 poles 3d

Technical Specifications

• Manufacturer: Schneider Electric

• Product Reference: 33478

• Series: ComPact NS1250N

• Device Type: Molded Case Circuit Breaker (MCCB)

• Rated Current (In): 1250 A

• Number of Poles: 3 poles (3d – three poles, all protected)

• Mounting Type: Fixed

• Breaking Capacity:

  • 50kA at 415V AC (IEC 60947-2 standard)

• Rated Operational Voltage (Ue): Up to 690V AC

• Rated Insulation Voltage (Ui): 1000V

• Impulse Withstand Voltage (Uimp): 8 kV

• Trip Unit Type: Micrologic 2.0 (electronic, fixed thresholds)

• Protection Functions:

  • Long-time (overload) protection

  • Short-circuit (instantaneous) protection

• Frequency: 50/60 Hz

• Installation: Panel-mounted

• Connection Type: Suitable for cable or busbar connections

• Standards Compliance: IEC 60947-2

• Operating Temperature Range: -25°C to +70°C

• Endurance:

  • Mechanical: 10,000 operations

  • Electrical: 2,000 operations at full load

Key Features

• High Breaking Capacity (50kA)
  Provides strong fault protection in medium to large-scale electrical networks, ensuring system safety and continuity.

• Micrologic 2.0 Trip Unit
  Electronic trip unit with precise protection for overload and short-circuit conditions. Simple, fixed settings for fast and consistent protection.

• Three-Pole, 3d Configuration
  Offers full-phase protection across all three lines, making it suitable for balanced three-phase systems.

• Fixed-Mount Design
  Cost-effective and robust solution for systems that do not require withdrawable breakers.

• Reliable and Compact
  Designed for space-saving in control panels and switchboards while maintaining full performance.

• Accessory Compatibility
  Supports auxiliary contacts, shunt trips, undervoltage releases, and other advanced features for monitoring and control.

• Visible ON/OFF Indicator
  Enhances safety by clearly showing the status of the breaker during operation and maintenance.

Applications

• Main Circuit Protection
  Serves as the primary protective device in large distribution boards or switchgear assemblies.

• Industrial Installations
  Suitable for protection of heavy machinery, motors, and feeders in production facilities.

• Commercial Buildings
  Ideal for use in malls, office towers, hospitals, and data centers where power reliability is critical.

• Renewable Energy & Utilities
  Used in solar, wind, and hybrid energy systems requiring high-current protection.

• Infrastructure Projects
  Perfect for large-scale developments such as airports, railways, and smart grids.

• Critical Power Systems
  Delivers reliable protection in mission-critical applications like telecom networks, control centers, and emergency services.