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Masterpact™ NT and NW Universal Power Circuit Breakers

Micrologic™ Electronic Trip Systems

05/2014

Micrologic Trip Units–Overview

True RMS Current Sensing

The sensing system responds to the flow of current through the circuit breaker. Electronic trip circuit

breakers are limited to ac systems because the electronic trip system uses current transformers to

sense the current.The Micrologic trip unit samples the current waveform to provide true RMS

protection through the 15th harmonic.

This true RMS sensing gives accurate values for the magnitude of a non-sinusoidal waveform.

Therefore, the heating effects of harmonically distorted waveforms are accurately evaluated.

The Micrologic H trip unit provides additional sampling of the waveforms to measure and provide

waveform capture of harmonic distortion to the 31st harmonic.

Masterpact universal power circuit breakers use Micrologic electronic trip systems to sense overcurrents

and trip the circuit breaker. The Micrologic basic trip unit is standard and all Masterpact circuit breakers can

be equipped with the optional Micrologic trip systems listed below:

•

Micrologic Basic Trip Unit (standard).

— 2.0 basic protection (LS0, IEC)

— 3.0 basic protection (LI, UL

/ANSI)

— 5.0 selective protection (LSI)

•

Micrologic A: Trip Unit with Ammeter.

— 2.0A basic protection (LS0, IEC)

— 3.0A basic protection (LI, UL/ANSI)

— 5.0A selective protection (LSI)

— 6.0A selective protection with ground-fault protection for equipment (LSIG)

•

Micrologic P: Trip Unit with Power Metering.

— 5.0P selective protection (LSI)

— 6.0P selective protection with ground-fault protection for equipment (LSIG)

•

Micrologic H: Trip Unit with Harmonic Metering.

— 5.0H selective protection (LSI)

— 6.0H selective protection with ground-fault protection for equipment (LSIG)

Micrologic 3.0 and 5.0 Basic Trip Units

Micrologic 3.0A, 5.0A and 6.0A Trip Units

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Universal Remote Control MX-880Z - SPECS SHEET Informazioni Techniche Pagina 22