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Masterpact NW
Masterpact NW
Masterpact NW

Masterpact NW - High current air circuit breakers from 800 to 6300 A


  • Nominal current: 800 to 6300 A
  • Breaking performance: 42 to 150 kA at 220/415 V AC
  • Voltage rating: up to 1000 V
  • 2 physical sizes from 800 to 6300 A
  • 2 pole pitches of 115 and 230 mm
  • 3- and 4-pole versions
  • 5 types of Micrologic control units with added measurement, energy-management and network-analysis functions
  • Earth leakage protection built into the control unit
  • Wide range of common auxiliaries and accessories interchangeable on site
  • Compliance with international standards IEC 60947-1 and 2, IEC 68230 for type 2 tropicalization, UL489 and ANSI/UL1066
  • CCC and GOST certifications
  • Compliance with specifications of marine classification bodies: Bureau Veritas, Lloyd’s Register of Shipping, Det Norske Veritas, etc.
The worldwide benchmark for high-current circuit-breakers
The Masterpact NW circuit-breaker range features optimised dimensions: not only is it more compact, but even better two sizes are sufficient to cover requirements from 4000 to 6300 A.
At a time when installations are becoming increasingly complex, Masterpact NW enables standardisation of electrical switchboards by providing unrivalled simplicity in terms of both choice and installation.

General Applications

  • Protection, measurement and communication of LV electrical networks
  • Generator protection
  • Motor protection

Special applications

  • DC networks
  • Protection of installations in highly corrosive industrial environments
  • Mines (special 1000V version of NW)
  • Navy
  • Earthing switch
  • High short-circuit current limiting (ultra-rapid Masterpact UR)
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