General

• Product range: ComPacT NSX DC
• Type: Molded Case Circuit Breaker (MCCB) for DC
• Application:
  • DC distribution systems
  • Photovoltaic (PV)
  • Marine & telecom systems
• Standards:
  • IEC / EN 60947-2 (circuit breakers)
  • IEC / EN 60947-3 (switch-disconnectors)

 Ratings (DC line protection up to 630 A)

• Rated current (In):
  • 16 → 600 A (standard DC breakers)
  • Up to 630 A (via configurations / switch-disconnector / parallel poles)
• Number of poles:
  • 1P / 2P / 3P / 4P (depending on voltage & application)

 Voltage ratings (DC)

• Rated operational voltage (Ue):
  • Up to 750 V DC (standard distribution)
  • Up to 1000 V / 1500 V DC (PV-specific versions)
• Configuration:
  • Series or parallel pole connection for higher voltage/current

 Breaking capacity (Icu)

• Typical DC breaking capacity:
  • Up to 100 kA @ 750 V DC (depending on poles/configuration)
• Service breaking capacity:
  • Ics = 100% of Icu (high reliability)

 Insulation & dielectric characteristics

• Rated insulation voltage (Ui): 750 V DC
• Impulse withstand voltage (Uimp): 8 kV
• Pollution degree: 3

 Trip units (DC protection)

Thermal-magnetic (main technology)

• Used across DC range
• Types:
  • TM-D / TM-DC / TM-G
• Functions:
  • Overload protection (thermal)
  • Short-circuit protection (magnetic)

Magnetic-only (high current frames)

• For 400 A / 630 A
• Adjustable instantaneous protection levels

 Protection functions

• Overload (long-time)
• Short-circuit (instantaneous)
• Designed for:
  • DC fault interruption (fast arc extinction)
  • High L/R time constant systems

 Mechanical & construction

• Versions:
  • Fixed
  • Plug-in
  • Withdrawable
• Mounting:
  • Vertical / horizontal / flat (no derating)
• Poles configurable in:
  • Series (increase voltage)
  • Parallel (increase current)

 Performance

• Breaking time: < 10 ms
• Mechanical durability:
  • Up to 10,000 operations
• Electrical durability:
  • Up to 5,000 cycles (at In)

 Environmental conditions

• Operating temperature: –25°C to +70°C
• Storage temperature: –50°C to +85°C
• Altitude: up to 2000 m (typical without derating)

 Key features (DC new generation)

• High-performance DC arc interruption chambers
• Flexible series / parallel pole configurations
• Compatibility with AC NSX accessories
• Suitable for:
  • Floating, grounded, or mid-point DC systems
• Full isolation capability (positive break indication)

 Typical models (DC ≤630 A)

• NSX100 DC
• NSX160 DC
• NSX250 DC
• NSX400 DC
• NSX630 DC

Engineering notes (important for DC systems)

• DC breaking requires pole combinations → rating depends on:
  • Number of poles used
  • Voltage level (e.g., 2P = 500 V, 3P = 750 V)
• Always verify:
  • L/R time constant
  • Pole wiring configuration
  • Application type (PV, battery, telecom)