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    MasterPact NW and NT Circuit Breakers with Arc Flash Protection

    Industry-leading protection for personnel and equipment.

    The design of the new Masterpact NW arc flash-protecting circuit breaker is unique to the industry. The blow-open terminal is shaped so there is a reverse current loop at the moving arm. This reverse current flow creates a magnetic force that is proportionate to the amount of current.

    MasterPact NW and NT Circuit Breakers with Arc Flash Protection
    • Features

      Digest-product-info

      When the current is high enough, the force pushes open the contacts. The contacts open very quickly, without waiting for the mechanism to unlatch and the springs to pull the moving arm open. Between the folds of the blow-open terminal, where the reverse current loop is located, is the U-magnet, which intensifies the magnetic opening force. The Masterpact NW arc flash-protecting circuit breaker is designed to open quickly. This quick-opening action clears the fault and reduces the arc flash incident energy.

      The new technology employed in the Masterpact® NW and NT circuit breakers make them unique in the industry. The technology provides the following benefits:

      • Comparable or better arc flash incident energy and personnel protection to fuse protected circuit breakers
      • Reliable power
      • A smaller footprint
      • Reduced maintenance needs
      • High interrupting ratings without fuses: Masterpact NW = 200,000 A at 508 Vac
      • Circuit breakers designed for all applications:
        • High withstand-rated circuit breakers for system coordination
        • High close and latch ratings for systems with high inrushes, etc.
        • Quick-opening designs for high available fault currents
        • Quick-opening designs for arc flash protection without fuses

      Masterpact NW and NT circuit breakers installed in PZ4 switchgear make possible smaller and safer installations. Since the Masterpact NW and NT circuit breakers do not need fuses, the following problems are eliminated:

      • hazards associated with changing fuses;
      • the need for additional mechanical hardware and items that can wear out, including fuse holders, blown fuse indicators, single-phasing devices, etc. that must be maintained or replaced and can become dislodged and cause arcing events;
      • higher energy costs caused by additional resistance in the fuse holder and connections;
      • larger equipment footprints;
      • higher installation and service-life costs;
      • the need to stock and replace fuses after overloads or short circuits


        UL Listed Masterpact NT Series with Arc Flash Protection

        • Available in 800A and 1200A frame ratings
        • Interrupting Rating: 200kA at 240Vac, 100kA at 480Vac
        • Meets UL 489 standards
          ANSI Certified Masterpact NW Series with Arc Flash Protection
          • Available in 800A, 1600A and 2000A frame ratings
          • Interrupting Rating: 200kA at 254Vac, 200kA at 508Vac, 130kA at 635Vac
          • Meets UL 1066 and ANSI C37 standards

          Benefits


          Applications