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Micrologic Trip Units

Control Units for PowerPact™ P, R, and Masterpact NT, NW

Part of Pact Series

Provide impeccable, electronic circuit protection with adjustable protection settings for maximum system coordination and flexibility. Sophisticated functionality, such as energy and power quality metering capabilities, is integrated in the more advanced trip units.

Micrologic Trip Units
  • Features

    The Micrologic® trip units make adding functionality very easy. They plug directly into Masterpact® NW, NT power circuit breakers or PowerPact™ circuit breakers and can be installed easily on site. This family of trip units includes four models with varying levels of functionality:

    Micrologic 3.0 and 5.0 -- basic overcurrent protection including long-time, instantaneous and optional short-time adjustments for overloads and short circuits.

    Micrologic 3.0A and 5.0A and 6.0A -- long-time, instantaneous and optional short-time adjustments, integrated ammeter and phase loading bar graph, LED trip indicator, zone selective interlocking with downstream breakers, optional ground-fault protection, optional Modbus® or Ethernet communication interface.

    Micrologic 5.0P and 6.0P -- long-time, instantaneous and short-time adjustments, advanced relay functions, inverse definite minimum time lag (Idmtl) long-time delay curve shaping for improved coordination, power monitoring and metering functions, Modbus or Ethernet communication interface, 6.0P adds ground-fault protection for equipment.

    Micrologic 5.0H and 6.0H -- includes all 5.0P and 6.0P functions, enhanced monitoring and metering capabilities, basic power quality (harmonic) measurement, waveform capture.

    How to Videos

    Adjusting Settings on Micrologic P and H Style Trip Units

    Viewing Peak Values on Micrologic Ammeter Trip Unit

    Resetting Peak Values on Micrologic Ammeter Trip Unit

    Changing Power Sign on Micrologic Power or Harmonic Trip Unit


    • Smart way to put energy measurement where you need it
    • Protection, measurement and communication, reliably in one device
    • Provide energy information to anyone who needs it


    • Power protection, measurement, monitoring, quality for low voltage systems
    • Energy management and monitoring
    • Critical power

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