SKU: NW50HA4PWHH Categories: ,


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The worldwide benchmark for high current circuit breakers

MasterPact NW circuit breakers are equipped with MicroLogic control units that offer built-in power and energy metering in addition to basic or advanced protection functions. Two sizes are sufficient to cover applications from 800 to 6300 A, with breaking capacity from 42 to 150 kA.

The range comes with a wide choice of standardized accessories. The universal design of the MasterPact circuit breaker line allows most accessories to be used across the entire line. It enables standardization of electrical switchboards by providing peace of mind in terms of choice, installation, and operation.


  • Rated current: 800 to 6300 A
  • Breaking capacity: 42 to 150 kA at 220/415 V AC
  • Voltage rating: up to 1150 V AC
  • 2 physical sizes: 800 to 4000 A, and 4000 A to 6300 A
  • Draw out and fixed mount
  • 3-pole and 4-pole construction
  • Electronic MicroLogic control units, integrating current, voltage, power and energy?metering enabling energy management, earth leakage protection, and other advanced protection or network analysis functions
  • Switch disconnectors version available
  • Optimized range of field-installable auxiliaries and accessories
  • Different offers complying with different international standards: IEC 60947, UL489, ANSI/UL1066
  • CCC, EAC and other local certifications
  • Compliance with specifications of marine classification companies: Bureau Veritas, Lloyd’s Register of Shipping, Det Norske Veritas, etc.

MicroLogic control unit specifications:

  • 4 levels of protection against overloads and short circuits: 2.0 (LI), 5.0(LSI), 6.0(LSIG), 7.0 (LSIV, built-in earth leakage protection)
  • 4 types of measurement: A (Ammeter), E (Energy), P (Power), and H (Harmonics)
  • Energy reduction maintenance setting (ERMS) function available for arc flash protection for MicroLogic P and MicroLogic H
  • Measurement accuracy: Class 0.5 for voltage, Class 1.5 for current, and Class 2 for active power and energy
  • Compatible with both Ethernet and Modbus SL protocol
  • Operating assistance to diagnose tripping cause and maintenance information


MasterPact NW circuit breakers contribute to reliability and continuity of service of your electrical installation thanks to:

Optimized safety

  • Faultless protection
  • Increased uptime with improved coordination with MicroLogic electronic trip unit adjustability
  • Complete selectivity and coordination
  • High resistance to environmental stresses

Integrated monitoring for energy efficiency

  • Improved uptime with complete monitoring solution in Smart Panels
  • Seamless integration into power monitoring systems enabling to track energy consumption trends, anticipate potential damage and improve network reliability
  • Local and remote communication with trip cause (earth leakage, overload, short-circuit) and alarms (earth leakage, overload) allowing proactive operational and energy efficiency
  • Advanced MicroLogic control unit can assist in providing corrective, preventive and predictive maintenance, and energy management to identify potential savings:?energy consumption data, operation follow-up, network monitoring, preventative and predictive maintenance information, pre-alarm and alarm events

Seamless installation

  • Compactness
  • Standardized range of auxiliaries and accessories
  • Wide range of online and offline software tools that improve productivity at all stages of your project (EcoStruxure Power Design – Ecodial, Product Selector,?EcoStruxure Power Commission)

MasterPact NW is a part of?EcoStruxure? Power?? Schneider Electric?s open, interoperable, IoT-enabled system architecture.


General applications?in all types of low voltage electrical installations

Suitable in most applications for protection, measurement, monitoring and quality of energy, including generator protection and motor protection, in standard applications and specific applications demanding high performance, including:

  • Industry: mining operations, minerals, metals, and cement production, water & wastewater industry, automotive, food and beverage, etc.
  • Oil & Gas extraction and processing, Chemicals industries
  • Data centers infrastructure
  • Healthcare infrastructure, hospitals
  • Marine and offshore industry
  • Infrastructures: airports, railways, subways, tunnels, power plants, etc.
  • Buildings: commercial buildings, hotels, offices
  • Wind turbines, solar, gensets

Special applications

  • Photovoltaic and DC networks (MasterPact NW DC & DC PV)
  • Corrosive industrial environments (special versions)
  • Mining industry (special 1000V versions)
  • High short-circuit current limiting (ultra-rapid MasterPact UR)
  • Navy (MasterPact NT and NW Navy)
  • UL 489 (MasterPact NT and NW UL 489 listed)
  • Source-changeover systems (TransferPact): service sector (hospital operating rooms, computer rooms, etc.), industry (assembly lines, ship engine rooms, etc.), infrastructures (runway, railway, etc.)


Schneider Electric

Schneider Electric is a European multinational company[4] providing energy and automation digital solutions for efficiency and sustainability.[5] It addresses homes,[6] buildings,[7] data centers,[8] infrastructure and industries,[9] by combining energy technologies, real-time automation, software and services.[10] The company has operations in over 100 countries and employs 135,000+ people.[11] The company is a Fortune Global 500 company, publicly traded on the Euronext Exchange, and is a component of the Euro Stoxx 50 stock market index.[12] In FY2019, the company posted revenues of €27.2 billion.[13] Schneider Electric is the parent company of Square DAPC and others. It is also a research company, investing EUR10 billion in innovation and R&D for sustainable development between 2015 and 2025.[14] The company holds 20,000 patents either active or in application worldwide and invests 5% of its annual revenue in Research and Development.[15] The company began in 1836 as Schneider & Cie. It was ultimately renamed Schneider Electric in May 1999.

Additional information

Weight120 kg



breaking Capacity




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