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MasterPact for Direct Current

Circuit-breakers to protect DC energized lines, up to 4000 A

Part of Pact Series

MasterPact NW DC is a comprehensive range of air circuit breakers designed to protect electrical systems from damage caused by overloads, short circuits and equipment ground faults in direct current installations including photovoltaic applications. Embedding MicroLogic DC control unit, it contributes to safety and energy management. The range covers ratings from 1000 to 4000 A in one unique size.

MasterPact for Direct Current
  • Features

    High current air circuit breakers for DC installations

    MasterPact NW DC circuit breakers are equipped with MicroLogic DC control units that offer built-in adjustable instantaneous protection. One unique size covers applications from 1000 to 4000 A, with breaking capacity from 25 to 100 kA, depending on the time constant L/R and on the voltage level. 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: 1000, 2000, and 4000 A
    • Breaking capacity: up to 85 kA at 900 V DC and L/R = 5 ms
    • Voltage rating: up to 900 V DC (switch disconnectors for PV application: up to 1000 V DC)
    • 1 unique physical size
    • Draw out and fixed mount
    • 3-pole – type C & D, and 4-pole – type E construction
    • MicroLogic DC control unit, offering built-in adjustable instantaneous protection, operating with electromagnetic sensors
    • Circuit breakers for the protection of power circuits and loads
    • Switch disconnectors for control circuit and disconnection
    • Optimized range of field-installable auxiliaries and accessories
    • Offer complying with different international standards: IEC 60947, UL489, ANSI/UL1066
    • Compliance with specifications of marine classification companies: Lloyd’s Register of Shipping


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

    Optimized safety

    • Faultless protection
    • Complete selectivity and coordination
    • High resistance to environmental stresses

    Integrated monitoring for energy efficiency

    • Increased uptime with improved coordination with MicroLogic trip unit

    Seamless installation

    • Compactness
    • Standardized range of auxiliaries and accessories


    General applications in all types of direct current electrical installations, including photovoltaic applications

    Suitable in most applications for protection demanding high performance, including:

    • Photovoltaic applications, wind farm installations, and energy storage systems
    • Data centers
    • Industry
    • Marine and offshore industry
    • Nuclear power

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