Universal Remote Control MX-880Z - SPECS SHEET Informazioni Techniche Scaricare il pdf (Pagina 25)

™

Masterpact™ NT and NW Universal Power Circuit Breakers

Micrologic™ Electronic Trip Systems

05/2014

Micrologic

2.0A, 3.0A, 5.0A, & 6.0A Trip Units with Ammeter

Micrologic A trip units protect power circuits and provide current measurements, overload protection,

and short-circuit protection. In addition, the 6.0A trip units also provide ground-fault protection for

equipment.

Protection Settings

Ammeter Measurements

Micrologic

A trip units measure the true RMS value of currents. They provide continuous current

measurement from 0.2 to 20 x I

with an accuracy of 1.5% (including sensors). No auxiliary source is

needed where I > 0.2 x I

. The optional external power supply (24 Vdc) makes it possible to display

currents where I < 0.2 x I

and to store values of the interrupted current. A digital LCD screen

continuously displays the most heavily loaded phase (Imax) or displays the Ia, Ib, Ic, Ig, and (on 4P circuit

breakers only) In stored current and setting values by successively pressing the navigation button.

Communication Network

Four wire Modbus, RTU, RS485

In conjunction with an optional communication network, the trip unit transmits the following parameters:

•

Setting values.

•

All ammeter measurements.

•

Tripping causes.

NOTE: Current-based protection functions require no auxiliary power source. When an external power

supply is added, the value of the interrupted current is stored by the trip unit. The reset button resets

alarms, and stored interrupted current indications.

1—Test lamp and reset

2—Indication of tripping

cause

3—Digital display

4—Three-phase bar graph

and ammeter

5—Navigation buttons

6—Overload signal (LED)

7—Long-time rating plug

screw

8—Long-time current setting

and tripping delay

9—Short-time pickup and

tripping delay

10—Instantaneous pickup

11—Electronic push-to-trip

12—Ground-fault pickup and

tripping delay

13—Test connector

Protection thresholds and delays are set using the rotary switches. The

selected values are momentarily displayed in amperes and in seconds.

A full-range of long-time settings are available via field-installable rating

plug.

•

Overload protection (true RMS long-time protection).

•

Thermal imaging (active thermal imaging before and after tripping).

•

Short-circuit protection.

— Short-time RMS

—I

t ON or OFF for short-time delay

•

Instantaneous protection.

•

Ground-fault protection for equipment.

— Residual ground-fault protection for equipment

— Source ground-return ground-fault protection for equipment

— Modified differential ground-fault protection (MDGF) for

equipment

•

Neutral protection on four-pole circuit breakers.

•

ZSI: Zone-selective interlocking (a ZSI terminal block may be used to

interconnect a number of trip units to provide total discrimination for

short-time and equipment ground-fault protection, without delay for

tripping). Not available for 3.0 A trip unit. Not available for 2.0 A trip

unit if installed as upstream device.

Micrologic 6.0A Trip Unit

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